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symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/guideinput.html
author Mike Kinghan <mikek@symbian.org>
Thu, 25 Nov 2010 14:28:39 +0000
branchGCC_SURGE
changeset 135 10852f1a0ae9
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Merge a pointless head that got away.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<HTML
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><HEAD
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><TITLE
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>Input handling</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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"><LINK
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REL="HOME"
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TITLE="SDL Library Documentation"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="SDL Guide"
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HREF="guide.html"><LINK
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REL="PREVIOUS"
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TITLE="Using OpenGL With SDL"
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HREF="guidevideoopengl.html"><LINK
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REL="NEXT"
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TITLE="Handling the Keyboard"
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HREF="guideinputkeyboard.html"></HEAD
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><BODY
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CLASS="CHAPTER"
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BGCOLOR="#FFF8DC"
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TEXT="#000000"
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LINK="#0000ee"
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VLINK="#551a8b"
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ALINK="#ff0000"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>SDL Library Documentation</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="guidevideoopengl.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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></TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="guideinputkeyboard.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="CHAPTER"
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><H1
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><A
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NAME="GUIDEINPUT"
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></A
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>Chapter 3. Input handling</H1
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><DIV
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CLASS="TOC"
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><DL
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><DT
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><B
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>Table of Contents</B
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></DT
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><DT
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><A
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HREF="guideinput.html#GUIDEINPUTJOYSTICK"
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>Handling Joysticks</A
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></DT
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><DT
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><A
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HREF="guideinputkeyboard.html"
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>Handling the Keyboard</A
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></DT
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></DL
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></DIV
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="GUIDEINPUTJOYSTICK"
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></A
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>Handling Joysticks</H1
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN135"
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></A
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>Initialization</H2
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><P
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>The first step in using a joystick in a SDL program is to initialize the Joystick subsystems of SDL. This done by passing the <TT
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CLASS="LITERAL"
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>SDL_INIT_JOYSTICK</TT
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> flag to <A
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HREF="sdlinit.html"
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><TT
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CLASS="FUNCTION"
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>SDL_Init</TT
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></A
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>.  The joystick flag will usually be used in conjunction with other flags (like the video flag) because the joystick is usually used to control something.</P
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><DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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   125
 
CLASS="EXAMPLE"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   126
 
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   127
 
NAME="AEN141"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   128
 
></A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   129
 
><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   130
 
><B
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   131
 
>Example 3-1. Initializing SDL with Joystick Support</B
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   132
 
></P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   133
 
><PRE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   134
 
CLASS="PROGRAMLISTING"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   135
 
>    if (SDL_Init( SDL_INIT_VIDEO | SDL_INIT_JOYSTICK ) &#60; 0)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   136
 
    {
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   137
 
        fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   138
 
        exit(1);
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   139
 
    }</PRE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   140
 
></DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   141
 
><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   142
 
>This will attempt to start SDL with both the video and the joystick subsystems activated.</P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   143
 
></DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   144
 
><DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   145
 
CLASS="SECT2"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   146
 
><H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   147
 
CLASS="SECT2"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   148
 
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   149
 
NAME="AEN145"
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   150
 
></A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   151
 
>Querying</H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   152
 
><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   153
 
>If we have reached this point then we can safely assume that the SDL library has been initialized and that the Joystick subsystem is active. We can now call some video and/or sound functions to get things going before we need the joystick. Eventually we have to make sure that there is actually a joystick to work with. It's wise to always check even if you know a joystick will be present on the system because it can also help detect when the joystick is unplugged. The function used to check for joysticks is <A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   154
 
HREF="sdlnumjoysticks.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   155
 
><TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   156
 
CLASS="FUNCTION"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   157
 
>SDL_NumJoysticks</TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   158
 
></A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   159
 
>.</P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   160
 
><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   161
 
>This function simply returns the number of joysticks available on the system. If it is at least one then we are in good shape. The next step is to determine which joystick the user wants to use. If the number of joysticks available is only one then it is safe to assume that one joystick is the one the user wants to use. SDL has a function to get the name of the joysticks as assigned by the operations system and that function is <A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   162
 
HREF="sdljoystickname.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   163
 
><TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   164
 
CLASS="FUNCTION"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   165
 
>SDL_JoystickName</TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   166
 
></A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   167
 
>.  The joystick is specified by an index where 0 is the first joystick and the last joystick is the number returned by <TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   168
 
CLASS="FUNCTION"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   169
 
>SDL_NumJoysticks</TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   170
 
> - 1.  In the demonstration a list of all available joysticks is printed to stdout.</P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   171
 
><DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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   172
 
CLASS="EXAMPLE"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   173
 
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   174
 
NAME="AEN154"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   175
 
></A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   176
 
><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   177
 
><B
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   178
 
>Example 3-2. Querying the Number of Available Joysticks</B
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diff changeset 
   179
 
></P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><PRE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   181
 
CLASS="PROGRAMLISTING"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   182
 
>    printf("%i joysticks were found.\n\n", SDL_NumJoysticks() );
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   183
 
    printf("The names of the joysticks are:\n");
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   184
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   185
 
    for( i=0; i &#60; SDL_NumJoysticks(); i++ )
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   186
 
    {
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   187
 
        printf("    %s\n", SDL_JoystickName(i));
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   188
 
    }</PRE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   189
 
></DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   190
 
></DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   191
 
><DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   192
 
CLASS="SECT2"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   193
 
><H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   194
 
CLASS="SECT2"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   195
 
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   196
 
NAME="AEN157"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   197
 
></A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   198
 
>Opening a Joystick and Receiving Joystick Events</H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   199
 
><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   200
 
>SDL's event driven architecture makes working with joysticks a snap.  Joysticks can trigger 4 different types of events:
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   201
 
<P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   202
 
></P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   203
 
><TABLE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   204
 
BORDER="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   205
 
><TBODY
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset 
   206
 
><TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   207
 
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   208
 
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   209
 
HREF="sdljoyaxisevent.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   210
 
><SPAN
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   211
 
CLASS="STRUCTNAME"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   212
 
>SDL_JoyAxisEvent</SPAN
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   213
 
></A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   214
 
></TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   215
 
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   216
 
>Occurs when an axis changes</TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   217
 
></TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   218
 
><TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   219
 
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   220
 
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   221
 
HREF="sdljoyballevent.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   222
 
><SPAN
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   223
 
CLASS="STRUCTNAME"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   224
 
>SDL_JoyBallEvent</SPAN
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   225
 
></A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   226
 
></TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   227
 
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   228
 
>Occurs when a joystick trackball's position changes</TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   229
 
></TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   230
 
><TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   231
 
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   232
 
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   233
 
HREF="sdljoyhatevent.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   234
 
><SPAN
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   235
 
CLASS="STRUCTNAME"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   236
 
>SDL_JoyHatEvent</SPAN
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   237
 
></A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   238
 
></TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   239
 
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   240
 
>Occurs when a hat's position changes</TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   241
 
></TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   242
 
><TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   243
 
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   244
 
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   245
 
HREF="sdljoybuttonevent.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   246
 
><SPAN
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset 
   247
 
CLASS="STRUCTNAME"
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>SDL_JoyButtonEvent</SPAN
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></A
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></TD
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><TD
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>Occurs when a button is pressed or released</TD
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></TR
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></TBODY
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></TABLE
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><P
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></P
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></P
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><P
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>Events are received from all joysticks opened. The first thing that needs to be done in order to receive joystick events is to call <A
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HREF="sdljoystickeventstate.html"
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><TT
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CLASS="FUNCTION"
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>SDL_JoystickEventState</TT
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></A
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> with the <TT
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CLASS="LITERAL"
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>SDL_ENABLE</TT
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> flag. Next you must open the joysticks that you want to receive envents from. This is done with the <A
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HREF="sdljoystickopen.html"
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><TT
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CLASS="FUNCTION"
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>SDL_JoystickOpen</TT
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></A
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> function. For the example we are only interested in events from the first joystick on the system, regardless of what it may be. To receive events from it we would do this:</P
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><DIV
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CLASS="EXAMPLE"
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><A
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NAME="AEN183"
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></A
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><P
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><B
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>Example 3-3. Opening a Joystick</B
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></P
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><PRE
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CLASS="PROGRAMLISTING"
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>    SDL_Joystick *joystick;
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    SDL_JoystickEventState(SDL_ENABLE);













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    joystick = SDL_JoystickOpen(0);</PRE













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   291


></DIV













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><P













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>If we wanted to receive events for other joysticks we would open them with calls to <TT













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CLASS="FUNCTION"













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>SDL_JoystickOpen</TT













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> just like we opened joystick 0, except we would store the <SPAN













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CLASS="STRUCTNAME"













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>SDL_Joystick</SPAN













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> structure they return in a different pointer.  We only need the joystick pointer when we are querying the joysticks or when we are closing the joystick.</P













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><P













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>Up to this point all the code we have is used just to initialize the joysticks in order to read values at run time. All we need now is an event loop, which is something that all SDL programs should have anyway to receive the systems quit events. We must now add code to check the event loop for at least some of the above mentioned events. Let's assume our event loop looks like this:













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<PRE













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CLASS="PROGRAMLISTING"













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>    SDL_Event event;













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    /* Other initializtion code goes here */   













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    /* Start main game loop here */













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    while(SDL_PollEvent(&#38;event))













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    {  













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        switch(event.type)













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        {  













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            case SDL_KEYDOWN:













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            /* handle keyboard stuff here */				













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            break;













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   316














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            case SDL_QUIT:













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            /* Set whatever flags are necessary to */













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            /* end the main game loop here */













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            break;













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   321


        }













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   322


    }













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   323














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    /* End loop here */</PRE













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>













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   326


To handle Joystick events we merely add cases for them, first we'll add axis handling code. Axis checks can get kinda of tricky because alot of the joystick events received are junk. Joystick axis have a tendency to vary just a little between polling due to the way they are designed. To compensate for this you have to set a threshold for changes and ignore the events that have'nt exceeded the threshold. 10% is usually a good threshold value.  This sounds a lot more complicated than it is. Here is the Axis event handler:</P













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   327


><DIV













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CLASS="EXAMPLE"













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><A













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NAME="AEN191"













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   331


></A













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><P













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   333


><B













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>Example 3-4. Joystick Axis Events</B













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   335


></P













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   336


><PRE













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   337


CLASS="PROGRAMLISTING"













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   338


>    case SDL_JOYAXISMOTION:  /* Handle Joystick Motion */













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    if ( ( event.jaxis.value &#60; -3200 ) || (event.jaxis.value &#62; 3200 ) ) 













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   340


    {













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   341


      /* code goes here */













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   342


    }













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   343


    break;</PRE













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   344


></DIV













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><P













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>Another trick with axis events is that up-down and left-right movement are two different sets of axes. The most important axis is axis 0 (left-right) and axis 1 (up-down).  To handle them seperatly in the code we do the following:</P













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><DIV













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CLASS="EXAMPLE"













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   349


><A













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NAME="AEN195"













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   351


></A













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   352


><P













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   353


><B













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   354


>Example 3-5. More Joystick Axis Events</B













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   355


></P













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   356


><PRE













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   357


CLASS="PROGRAMLISTING"













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   358


>    case SDL_JOYAXISMOTION:  /* Handle Joystick Motion */













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   359


    if ( ( event.jaxis.value &#60; -3200 ) || (event.jaxis.value &#62; 3200 ) ) 













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   360


    {













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   361


        if( event.jaxis.axis == 0) 













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Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   362


        {













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   363


            /* Left-right movement code goes here */













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   364


        }













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   365














2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   366


        if( event.jaxis.axis == 1) 













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   367


        {













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   368


            /* Up-Down movement code goes here */













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   369


        }













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   370


    }













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   371


    break;</PRE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   372


></DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   373


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   374


>Ideally the code here should use <TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   375


CLASS="STRUCTFIELD"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   376


><I













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   377


>event.jaxis.value</I













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   378


></TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   379


> to scale something. For example lets assume you are using the joystick to control the movement of a spaceship. If the user is using an analog joystick and they push the stick a little bit they expect to move less than if they pushed it a lot. Designing your code for this situation is preferred because it makes the experience for users of analog controls better and remains the same for users of digital controls.</P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   380


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   381


>If your joystick has any additional axis then they may be used for other sticks or throttle controls and those axis return values too just with different <TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   382


CLASS="STRUCTFIELD"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   383


><I













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   384


>event.jaxis.axis</I













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   385


></TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   386


> values.</P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   387


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   388


>Button handling is simple compared to the axis checking.</P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   389


><DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   390


CLASS="EXAMPLE"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   391


><A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   392


NAME="AEN203"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   393


></A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   394


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   395


><B













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   396


>Example 3-6. Joystick Button Events</B













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   397


></P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   398


><PRE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   399


CLASS="PROGRAMLISTING"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   400


>    case SDL_JOYBUTTONDOWN:  /* Handle Joystick Button Presses */













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   401


    if ( event.jbutton.button == 0 ) 













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   402


    {













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   403


        /* code goes here */













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   404


    }













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   405


    break;</PRE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   406


></DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   407


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   408


>Button checks are simpler than axis checks because a button can only be pressed or not pressed.  The <TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   409


CLASS="LITERAL"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   410


>SDL_JOYBUTTONDOWN</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   411


> event is triggered when a button is pressed and the <TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   412


CLASS="LITERAL"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   413


>SDL_JOYBUTTONUP</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   414


> event is fired when a button is released. We do have to know what button was pressed though, that is done by reading the <TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   415


CLASS="STRUCTFIELD"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   416


><I













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   417


>event.jbutton.button</I













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   418


></TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   419


> field.</P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   420


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   421


>Lastly when we are through using our joysticks we should close them with a call to <A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   422


HREF="sdljoystickclose.html"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   423


><TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   424


CLASS="FUNCTION"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   425


>SDL_JoystickClose</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   426


></A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   427


>. To close our opened joystick 0 we would do this at the end of our program:













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   428


<PRE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   429


CLASS="PROGRAMLISTING"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   430


>    SDL_JoystickClose(joystick);</PRE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   431


></P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   432


></DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   433


><DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   434


CLASS="SECT2"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   435


><H2













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   436


CLASS="SECT2"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   437


><A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   438


NAME="AEN214"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   439


></A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   440


>Advanced Joystick Functions</H2













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   441


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   442


>That takes care of the controls that you can count on being on every joystick under the sun, but there are a few extra things that SDL can support.  Joyballs are next on our list, they are alot like axis with a few minor differences.  Joyballs store relative changes unlike the the absolute postion stored in a axis event. Also one trackball event contains both the change in x and they change in y.  Our case for it is as follows:</P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   443


><DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   444


CLASS="EXAMPLE"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   445


><A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   446


NAME="AEN217"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   447


></A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   448


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   449


><B













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   450


>Example 3-7. Joystick Ball Events</B













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   451


></P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   452


><PRE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   453


CLASS="PROGRAMLISTING"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   454


>    case SDL_JOYBALLMOTION:  /* Handle Joyball Motion */













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   455


    if( event.jball.ball == 0 )













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   456


    {













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   457


      /* ball handling */













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   458


    }













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   459


    break;</PRE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   460


></DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   461


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   462


>The above checks the first joyball on the joystick. The change in position will be stored in <TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   463


CLASS="STRUCTFIELD"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   464


><I













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   465


>event.jball.xrel</I













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   466


></TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   467


> and <TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   468


CLASS="STRUCTFIELD"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   469


><I













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   470


>event.jball.yrel</I













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   471


></TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   472


>.</P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   473


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   474


>Finally we have the hat event. Hats report only the direction they are pushed in. We check hat's position with the bitmasks:













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   475














2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   476


<P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   477


></P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   478


><TABLE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   479


BORDER="0"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   480


><TBODY













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   481


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   482


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   483


><TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   484


CLASS="LITERAL"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   485


>SDL_HAT_CENTERED</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   486


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   487


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   488


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   489


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   490


><TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   491


CLASS="LITERAL"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   492


>SDL_HAT_UP</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   493


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   494


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   495


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   496


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   497


><TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   498


CLASS="LITERAL"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   499


>SDL_HAT_RIGHT</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   500


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   501


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   502


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   503


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   504


><TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   505


CLASS="LITERAL"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   506


>SDL_HAT_DOWN</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   507


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   508


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   509


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   510


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   511


><TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   512


CLASS="LITERAL"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   513


>SDL_HAT_LEFT</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   514


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   515


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   516


></TBODY













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   517


></TABLE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   518


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   519


></P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   520


>













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   521














2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   522


Also there are some predefined combinations of the above:













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   523


<P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   524


></P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   525


><TABLE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   526


BORDER="0"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   527


><TBODY













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   528


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   529


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   530


><TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   531


CLASS="LITERAL"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   532


>SDL_HAT_RIGHTUP</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   533


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   534


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   535


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   536


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   537


><TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   538


CLASS="LITERAL"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   539


>SDL_HAT_RIGHTDOWN</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   540


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   541


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   542


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   543


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   544


><TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   545


CLASS="LITERAL"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   546


>SDL_HAT_LEFTUP</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   547


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   548


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   549


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   550


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   551


><TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   552


CLASS="LITERAL"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   553


>SDL_HAT_LEFTDOWN</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   554


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   555


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   556


></TBODY













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   557


></TABLE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   558


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   559


></P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   560


>













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   561














2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   562


Our case for the hat may resemble the following:</P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   563


><DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   564


CLASS="EXAMPLE"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   565


><A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   566


NAME="AEN244"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   567


></A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   568


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   569


><B













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   570


>Example 3-8. Joystick Hat Events</B













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   571


></P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   572


><PRE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   573


CLASS="PROGRAMLISTING"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   574


>    case SDL_JOYHATMOTION:  /* Handle Hat Motion */













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   575


    if ( event.jhat.value &#38; SDL_HAT_UP )













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   576


    {













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   577


        /* Do up stuff here */













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   578


    }













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   579














2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   580


    if ( event.jhat.value &#38; SDL_HAT_LEFT )













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   581


    {













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   582


        /* Do left stuff here */













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   583


    }













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   584














2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   585


    if ( event.jhat.value &#38; SDL_HAT_RIGHTDOWN )













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   586


    {













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   587


        /* Do right and down together stuff here */













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   588


    }













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   589


    break;</PRE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   590


></DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   591


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   592


>In addition to the queries for number of joysticks on the system and their names there are additional functions to query the capabilities of attached joysticks:













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   593


<P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   594


></P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   595


><TABLE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   596


BORDER="0"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   597


><TBODY













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   598


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   599


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   600


><A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   601


HREF="sdljoysticknumaxes.html"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   602


><TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   603


CLASS="FUNCTION"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   604


>SDL_JoystickNumAxes</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   605


></A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   606


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   607


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   608


>Returns the number of joysitck axes</TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   609


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   610


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   611


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   612


><A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   613


HREF="sdljoysticknumbuttons.html"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   614


><TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   615


CLASS="FUNCTION"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   616


>SDL_JoystickNumButtons</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   617


></A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   618


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   619


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   620


>Returns the number of joysitck buttons</TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   621


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   622


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   623


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   624


><A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   625


HREF="sdljoysticknumballs.html"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   626


><TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   627


CLASS="FUNCTION"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   628


>SDL_JoystickNumBalls</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   629


></A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   630


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   631


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   632


>Returns the number of joysitck balls</TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   633


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   634


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   635


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   636


><A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   637


HREF="sdljoysticknumhats.html"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   638


><TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   639


CLASS="FUNCTION"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   640


>SDL_JoystickNumHats</TT













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   641


></A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   642


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   643


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   644


>Returns the number of joysitck hats</TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   645


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   646


></TBODY













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   647


></TABLE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   648


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   649


></P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   650


>













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   651














2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   652


To use these functions we just have to pass in the joystick structure we got when we opened the joystick. For Example:</P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   653


><DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   654


CLASS="EXAMPLE"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   655


><A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   656


NAME="AEN265"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   657


></A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   658


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   659


><B













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   660


>Example 3-9. Querying Joystick Characteristics</B













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   661


></P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   662


><PRE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   663


CLASS="PROGRAMLISTING"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   664


>    int number_of_buttons;













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   665


    SDL_Joystick *joystick;













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   666














2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   667


    joystick = SDL_JoystickOpen(0);













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   668


    number_of_buttons = SDL_JoystickNumButtons(joystick);</PRE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   669


></DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   670


><P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   671


>This block of code would get the number of buttons on the first joystick in the system.	</P













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   672


></DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   673


></DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   674


></DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   675


><DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   676


CLASS="NAVFOOTER"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   677


><HR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   678


ALIGN="LEFT"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   679


WIDTH="100%"><TABLE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   680


SUMMARY="Footer navigation table"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   681


WIDTH="100%"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   682


BORDER="0"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   683


CELLPADDING="0"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   684


CELLSPACING="0"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   685


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   686


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   687


WIDTH="33%"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   688


ALIGN="left"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   689


VALIGN="top"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   690


><A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   691


HREF="guidevideoopengl.html"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   692


ACCESSKEY="P"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   693


>Prev</A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   694


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   695


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   696


WIDTH="34%"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   697


ALIGN="center"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   698


VALIGN="top"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   699


><A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   700


HREF="index.html"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   701


ACCESSKEY="H"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   702


>Home</A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   703


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   704


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   705


WIDTH="33%"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   706


ALIGN="right"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   707


VALIGN="top"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   708


><A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   709


HREF="guideinputkeyboard.html"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   710


ACCESSKEY="N"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   711


>Next</A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   712


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   713


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   714


><TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   715


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   716


WIDTH="33%"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   717


ALIGN="left"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   718


VALIGN="top"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   719


>Using OpenGL With SDL</TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   720


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   721


WIDTH="34%"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   722


ALIGN="center"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   723


VALIGN="top"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   724


><A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   725


HREF="guide.html"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   726


ACCESSKEY="U"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   727


>Up</A













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   728


></TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   729


><TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   730


WIDTH="33%"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   731


ALIGN="right"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   732


VALIGN="top"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   733


>Handling the Keyboard</TD













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   734


></TR













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   735


></TABLE













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   736


></DIV













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   737


></BODY













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   738


></HTML













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



martin.trojer@nokia.com


parents: 

diff
changeset




   739


>














FCL/sf/adapt/qemu