--- a/Symbian3/SDK/Source/GUID-C60DC070-572B-5960-B394-550426FDB909.dita Wed Mar 31 11:11:55 2010 +0100
+++ b/Symbian3/SDK/Source/GUID-C60DC070-572B-5960-B394-550426FDB909.dita Fri Jun 11 12:39:03 2010 +0100
@@ -1,199 +1,199 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
-<!-- This component and the accompanying materials are made available under the terms of the License
-"Eclipse Public License v1.0" which accompanies this distribution,
-and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
-<!-- Initial Contributors:
- Nokia Corporation - initial contribution.
-Contributors:
--->
-<!DOCTYPE concept
- PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
-<concept id="GUID-C60DC070-572B-5960-B394-550426FDB909" xml:lang="en"><title> Advanced
-Pointer Tutorial</title><shortdesc>This tutorial provides step-by-step instructions and sample code
-to help you write applications using advanced pointers. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
-<p> <b>Variant</b>: <xref href="GUID-D93978BE-11A3-5CE3-B110-1DEAA5AD566C.dita">ScreenPlay</xref>. <b>Target
-audience</b>: Application developers. </p>
-<section><title>Required background </title> <p>This topic builds on the material
-in the following topics: </p> <ul>
-<li id="GUID-C4209FBD-3860-5F4B-8458-87D22D483953"><p><xref href="GUID-9C269F45-F160-5A4B-ABF8-896D2A538E3B.dita">Advanced
-Pointer Overview</xref> </p> </li>
-<li id="GUID-9D3C3B31-F43A-5201-A1EC-A1F2848CFF43"><p><xref href="GUID-9AD75103-CD56-5279-B639-5CA2BBF979B5.dita">Advanced
-Pointer States and Event Communication</xref> </p> </li>
-</ul> </section>
-<section><title>Using advanced pointers</title> <p>This topic covers the following: </p> <ul>
-<li id="GUID-C3AD43AA-09C0-5BA2-8496-5B87D40C89F5"><p><xref href="GUID-C60DC070-572B-5960-B394-550426FDB909.dita#GUID-C60DC070-572B-5960-B394-550426FDB909/GUID-8CBE862B-0C1D-5088-89B7-9B3EC898E4FC">Enabling multi-touch for a window</xref> </p> </li>
-<li id="GUID-177323F2-55C6-56D9-B3D2-A8DDACF69E10"><p><xref href="GUID-C60DC070-572B-5960-B394-550426FDB909.dita#GUID-C60DC070-572B-5960-B394-550426FDB909/GUID-C026DAB9-C11C-5D29-A1EA-6730E914250F">Getting Z coordinates from TPointerEvent</xref> </p> </li>
-<li id="GUID-91CEA92C-A692-5853-96F0-625A76B7DC8D"><p><xref href="GUID-C60DC070-572B-5960-B394-550426FDB909.dita#GUID-C60DC070-572B-5960-B394-550426FDB909/GUID-B7057F69-191F-5AA4-8C61-EBECE66D92F6"> Pinch zooming</xref> </p> </li>
-</ul> </section>
-<section id="GUID-8CBE862B-0C1D-5088-89B7-9B3EC898E4FC"><title>Enabling multi-touch
-in a window</title> <ol id="GUID-210D17A8-4869-5F9B-B71C-672101AC591C">
-<li id="GUID-81A2AC5C-7837-5216-8F47-FC5959C27522"><p> <xref href="GUID-637F82AF-0CF9-3C85-834D-7C1A0866DF87.dita"><apiname>RWindow</apiname></xref> provides
-a handle to a standard window. Call <codeph>RWindow</codeph> to create an
-instance of a window. </p> <codeblock id="GUID-0E31C3F6-3719-5F16-9F74-C405850604B8" xml:space="preserve">
-RWindow window(ws);
-
-User::LeaveIfError(window.Construct(wg, reinterpret_cast<TUint32>(&wg) + 1));
-</codeblock> </li>
-<li id="GUID-B67D3702-1A8F-5C6A-AB0F-FEA7C4D04A07"><p>Call <xref href="GUID-683603DD-F3D3-3193-BEB3-8236C7DE7F79.dita#GUID-683603DD-F3D3-3193-BEB3-8236C7DE7F79/GUID-05293539-F1B0-3C7D-BB14-3FD42F23D5C8"><apiname>RWindow::EnableAdvancedPointers()</apiname></xref> to
-enable advanced pointers. Then call <xref href="GUID-1460DD8F-9AA1-3B99-8FFD-F309959CCA34.dita#GUID-1460DD8F-9AA1-3B99-8FFD-F309959CCA34/GUID-4E02165A-DFCC-3D18-BB18-18726B28E90A"><apiname>RWindowBase::Activate()</apiname></xref> to
-display the window and enable the window to receive events. <xref href="GUID-683603DD-F3D3-3193-BEB3-8236C7DE7F79.dita"><apiname>RWindow</apiname></xref> inherits
-from <xref href="GUID-1460DD8F-9AA1-3B99-8FFD-F309959CCA34.dita"><apiname>RWindowBase</apiname></xref>, so you can call the <codeph>Activate()</codeph> function
-on <codeph>RWindow</codeph>. </p> <codeblock id="GUID-DB2FB570-2BB0-5C5F-9E4F-076D6A0E469E" xml:space="preserve">
-window.EnableAdvancedPointers();
-window.Activate();
-</codeblock> <p>When an application needs to receive advanced pointer events
-in a window, it must call <codeph>RWindowBase::EnableAdvancedPointers()</codeph> for
-the window <i>before</i> it is activated. </p> <p>If advanced pointers are
-not enabled for a window, it receives only standard <xref href="GUID-1FFA0073-3D83-388E-A824-08C31F90CC54.dita"><apiname>TPointerEvent</apiname></xref> information
-from a single pointer with no pressure and proximity data. The single pointer
-environment rules describe the way in which pointer events coming from many
-pointers in the multi-pointer model are transformed into events of one pointer.
-They are necessary to ensure that old single-pointer applications work in
-a multi-touch environment intuitively and as expected by the user. </p> <p>However,
-the new <codeph>TPointerEvent</codeph> types, <xref href="GUID-239D0A8B-2759-321D-AD48-976E80192239.dita"><apiname>EEnterCloseProximity</apiname></xref>, <xref href="GUID-8C6264B4-5E19-33A7-92B0-BB79C871BEC7.dita"><apiname>EExitCloseProximity</apiname></xref>, <xref href="GUID-F02DB96E-1541-3223-9B7B-79D45840DB7B.dita"><apiname>EEnterHighPressure</apiname></xref> and <xref href="GUID-15B5991C-B075-3110-B0A4-540EC282AA56.dita"><apiname>EExitHighPressure</apiname></xref>, are delivered to all windows,
-even to those that do not enable advanced pointers. </p> </li>
-</ol> </section>
-<section id="GUID-C026DAB9-C11C-5D29-A1EA-6730E914250F"><title>Getting Z coordinates
-from TPointerEvent</title> <ol id="GUID-4CC2271D-1798-51B3-9A9D-E7E0B9A33DAE">
-<li id="GUID-184B5B63-4EFC-55CD-8D1F-E015EEBACBE2"><p>Call <xref href="GUID-1FFA0073-3D83-388E-A824-08C31F90CC54.dita#GUID-1FFA0073-3D83-388E-A824-08C31F90CC54/GUID-E961DA4D-AD38-31F0-88DD-A07D36346DCB"><apiname>TPointerEvent::AdvancedPointerEvent()</apiname></xref> on
-a <codeph>TPointerEvent</codeph> to return a pointer to a <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita"><apiname>TAdvancedPointerEvent</apiname></xref>. </p> <codeblock id="GUID-6E81680A-3070-546B-B575-49EA9E34FAF9" xml:space="preserve">
-TZType aZType;
-TPointerEvent& aPointerEvent;
-TInt* aZ;
-TInt* aPoint3D;
-
-TAdvancedPointerEvent *advancedP = aPointerEvent.AdvancedPointerEvent();
-</codeblock> <p> <codeph>TPointerEvent</codeph> is a struct that contains
-details of a pointer event. <codeph>TZType</codeph> is a struct provided by
-the programmer containing members to hold proximity, pressure, and "proximity
-and pressure" data. </p> </li>
-<li id="GUID-ABA8FA09-5F57-51BC-8CAE-43649B5ED6D3"><p>Now we need to test
-whether the pointer event contains advanced pointer data. If it is not an
-advanced pointer, the code leaves. </p> <p>If it is an advanced pointer, we
-call functions to detect proximity, pressure, "proximity and pressure" data
-and coordinates. </p> <codeblock id="GUID-DF109643-2564-51A0-B0F6-33BF4DA1F6E3" xml:space="preserve">
-if(!advancedP)
- {
- // The TPointerEvent isn't an instance of TAdvancedPointerEvent
- User::Leave(KErrArgument);
- }
-
-switch(aZType)
- {
- case EZTypeProximity:
- aZ = advancedP->Proximity();
- aPoint3D = advancedP->Proximity3D();
- break;
- case EZTypePressure:
- aZ = advancedP->Pressure();
- aPoint3D = advancedP->Pressure3D();
- break;
- case EZTypeProximityAndPressure:
- aZ = advancedP->ProximityAndPressure();
- aPoint3D = advancedP->ProximityAndPressure3D();
- break;
- default:
- User::Leave(KErrArgument);
- break;
- }
-</codeblock> <ul>
-<li id="GUID-40C01884-AC86-5882-935D-2EC2E27C9004"><p> <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita#GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023/GUID-0ED4B1CC-0655-3246-8645-AAC9E0C27298"><apiname>TAdvancedPointerEvent::Proximity()</apiname></xref> returns
-the proximity. </p> </li>
-<li id="GUID-16A9A86B-A837-5E43-BB3A-F5A04A7F4552"><p> <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita#GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023/GUID-15DEBFBF-7B7D-3FCF-9929-C973824A5FD3"><apiname>TAdvancedPointerEvent::Pressure()</apiname></xref> returns
-the pressure. </p> </li>
-<li id="GUID-3E614890-C317-596E-A5B9-FD76426DBD12"><p> <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita#GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023/GUID-114AE77E-D0BD-321E-BFCB-1388B35582EC"><apiname>TAdvancedPointerEvent::ProximityAndPressure()</apiname></xref> returns
-the proximity and pressure combined. </p> </li>
-<li id="GUID-6F62C0D1-FAE4-5F8F-B451-68ABA404A369"><p> <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita#GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023/GUID-E5AA7737-D217-3FDE-9E4D-AAA7F5D2C300"><apiname>TAdvancedPointerEvent::
-Position3D()</apiname></xref> returns the proximity and the X, Y and Z coordinates. </p> </li>
-<li id="GUID-5AD1811D-BCBF-5A44-B6E7-EB71BF254BCA"><p> <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita#GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023/GUID-2F30A8F5-75BA-3FE3-84B7-3C772ED75857"><apiname>TAdvancedPointerEvent::Pressure3D()</apiname></xref> returns
-the pressure and the X and Y coordinates. </p> </li>
-</ul> <p>Proximity is <i>always</i> negative and pressure is <i>always</i> positive.
-Internally they are combined together as a Z coordinate. When Z > 0, the proximity
-is 0 and the Z value represents the pressure. When Z < 0, the pressure
-is 0 and the Z value represents the proximity. Some APIs use only a Z coordinate
-(such as the threshold getters and setters and <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita#GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023/GUID-114AE77E-D0BD-321E-BFCB-1388B35582EC"><apiname>TAdvancedPointerEvent::ProximityAndPressure()</apiname></xref>).
-In these, the Z coordinate is interpreted in terms of pressure and proximity. </p> </li>
-</ol> <fig id="GUID-7A49B143-5458-5916-B937-55D98B77BB2C">
-<title> Relationships between the pointer proximity, pressure and Z
- coordinate </title>
-<image href="GUID-1A0FB98B-8DB3-5067-9B71-FF838F6AE402_d0e198934_href.png" placement="inline"/>
-</fig> </section>
-<section id="GUID-B7057F69-191F-5AA4-8C61-EBECE66D92F6"><title>Pinch zooming</title> <p>This
-example shows an easy way to pinch zoom an image when the screen receives
-pointer events from two pointers. There are two functions in this code that
-must be implemented by the programmer: <codeph>BitmapCoordinates()</codeph> and <codeph>MoveBitmap()</codeph>.
-They are not included in the example because they involve complex calculations
-that are not related to advanced pointers. </p> <p>The high-level steps to
-perform pinch zooming are: </p> <ol id="GUID-AEF3917C-AAFE-5C25-9609-396D08478AC0">
-<li id="GUID-7839E665-C4E1-59C8-BA89-22A62615EFA3"><p>Define the coordinates,
-equivalent to the given on-screen coordinates. In the code example, this is
-done using the function <codeph>BitmapCoordinates()</codeph>. </p> </li>
-<li id="GUID-FC4B1BDA-8120-53C9-9C88-BEFEF1AD54B4"><p>Define the ID of the
-pointer by using <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita#GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023/GUID-67593D7E-CE40-303F-B847-81D6FC0578B1"><apiname>TAdvancedPointerEvent::PointerNumber()</apiname></xref>.
-If the device can handle two pointers (two fingers) at the same time, their
-numbers are 0 and 1. The pointer number enables you to distinguish a given
-pointer from other pointers. </p> </li>
-<li id="GUID-1E8F7D23-EEAD-5EA5-8863-276076D6B54E"><p>For each pointer assign
-its coordinates to a local variable. We assume there are only two pointers
-handled by the system here. </p> </li>
-<li id="GUID-E44B3D9B-560A-5959-996D-A63CBD4C3786"><p>Use the <codeph>MoveBitmap()</codeph> function
-to achieve the zoom effect. </p> <codeblock id="GUID-D85CCFDD-8F65-530A-ACD7-93DD1D435FC6" xml:space="preserve">
-/**
-Receives pointer events from two pointers to perform Pinch Zoom of the image.
-Function will finish when EButton1Up is received for any of the pointers.
-@param aPointer1 Coordinates of pointer number 1 when zoom is started
-@param aPointer2 Coordinates of pointer number 2 when zoom is started
-*/
-
-void PinchZoom(TPoint aPointer1, TPoint aPointer2)
- {
- TPoint actualP1 = aPointer1;
- TPoint actualP2 = aPointer2;
-
- // translate on-screen pointer coordinates to coordinates of displayed bitmap
- TPoint bitmapCatching1 = BitmapCoordinates(aPointer1);
- TPoint bitmapCatching2 = BitmapCoordinates(aPointer2);
-
- TBool repaint = EFalse;
-
- while (ETrue)
- {
- TAdvancedPointerEvent event = GetNextPointerEvent();
-
- if (event.iType == TPointerEvent::EDrag)
- {
- if (event.PointerNumber() == 1)
- {
- actualP1 = event.iPosition;
- repaint = ETrue;
- }
- else if (event.PointerNumber() == 2)
- {
- actualP2 = event.iPosition;
- repaint = ETrue;
- }
- }
- else if (event.iType == TPointerEvent::EButton1Up)
- {
- break;
- }
-
- if (repaint)
- {
- // move bitmap on the screen in the way that
- // bitmapCatching1 point of the bitmap will be displayed at actualP1 screen coordinate,
- // bitmapCatching2 point of the bitmap will be displayed at actualP2 screen coordinate.
- MoveBitmap(bitmapCatching1, actualP1, bitmapCatching2, actualP2);
- repaint = EFalse;
- }
- }
- }
-</codeblock> </li>
-</ol> </section>
-</conbody><related-links>
-<link href="GUID-9C269F45-F160-5A4B-ABF8-896D2A538E3B.dita"><linktext>Advanced
-Pointer Overview</linktext></link>
-<link href="GUID-9AD75103-CD56-5279-B639-5CA2BBF979B5.dita"><linktext>Advanced
-Pointer States and Event Communication</linktext></link>
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License
+"Eclipse Public License v1.0" which accompanies this distribution,
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+ Nokia Corporation - initial contribution.
+Contributors:
+-->
+<!DOCTYPE concept
+ PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-C60DC070-572B-5960-B394-550426FDB909" xml:lang="en"><title> Advanced
+Pointer Tutorial</title><shortdesc>This tutorial provides step-by-step instructions and sample code
+to help you write applications using advanced pointers. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p> <b>Variant</b>: <xref href="GUID-D93978BE-11A3-5CE3-B110-1DEAA5AD566C.dita">ScreenPlay</xref>. <b>Target
+audience</b>: Application developers. </p>
+<section><title>Required background </title> <p>This topic builds on the material
+in the following topics: </p> <ul>
+<li id="GUID-C4209FBD-3860-5F4B-8458-87D22D483953"><p><xref href="GUID-9C269F45-F160-5A4B-ABF8-896D2A538E3B.dita">Advanced
+Pointer Overview</xref> </p> </li>
+<li id="GUID-9D3C3B31-F43A-5201-A1EC-A1F2848CFF43"><p><xref href="GUID-9AD75103-CD56-5279-B639-5CA2BBF979B5.dita">Advanced
+Pointer States and Event Communication</xref> </p> </li>
+</ul> </section>
+<section><title>Using advanced pointers</title> <p>This topic covers the following: </p> <ul>
+<li id="GUID-C3AD43AA-09C0-5BA2-8496-5B87D40C89F5"><p><xref href="GUID-C60DC070-572B-5960-B394-550426FDB909.dita#GUID-C60DC070-572B-5960-B394-550426FDB909/GUID-8CBE862B-0C1D-5088-89B7-9B3EC898E4FC">Enabling multi-touch for a window</xref> </p> </li>
+<li id="GUID-177323F2-55C6-56D9-B3D2-A8DDACF69E10"><p><xref href="GUID-C60DC070-572B-5960-B394-550426FDB909.dita#GUID-C60DC070-572B-5960-B394-550426FDB909/GUID-C026DAB9-C11C-5D29-A1EA-6730E914250F">Getting Z coordinates from TPointerEvent</xref> </p> </li>
+<li id="GUID-91CEA92C-A692-5853-96F0-625A76B7DC8D"><p><xref href="GUID-C60DC070-572B-5960-B394-550426FDB909.dita#GUID-C60DC070-572B-5960-B394-550426FDB909/GUID-B7057F69-191F-5AA4-8C61-EBECE66D92F6"> Pinch zooming</xref> </p> </li>
+</ul> </section>
+<section id="GUID-8CBE862B-0C1D-5088-89B7-9B3EC898E4FC"><title>Enabling multi-touch
+in a window</title> <ol id="GUID-210D17A8-4869-5F9B-B71C-672101AC591C">
+<li id="GUID-81A2AC5C-7837-5216-8F47-FC5959C27522"><p> <xref href="GUID-637F82AF-0CF9-3C85-834D-7C1A0866DF87.dita"><apiname>RWindow</apiname></xref> provides
+a handle to a standard window. Call <codeph>RWindow</codeph> to create an
+instance of a window. </p> <codeblock id="GUID-0E31C3F6-3719-5F16-9F74-C405850604B8" xml:space="preserve">
+RWindow window(ws);
+
+User::LeaveIfError(window.Construct(wg, reinterpret_cast<TUint32>(&wg) + 1));
+</codeblock> </li>
+<li id="GUID-B67D3702-1A8F-5C6A-AB0F-FEA7C4D04A07"><p>Call <xref href="GUID-683603DD-F3D3-3193-BEB3-8236C7DE7F79.dita#GUID-683603DD-F3D3-3193-BEB3-8236C7DE7F79/GUID-05293539-F1B0-3C7D-BB14-3FD42F23D5C8"><apiname>RWindow::EnableAdvancedPointers()</apiname></xref> to
+enable advanced pointers. Then call <xref href="GUID-1460DD8F-9AA1-3B99-8FFD-F309959CCA34.dita#GUID-1460DD8F-9AA1-3B99-8FFD-F309959CCA34/GUID-4E02165A-DFCC-3D18-BB18-18726B28E90A"><apiname>RWindowBase::Activate()</apiname></xref> to
+display the window and enable the window to receive events. <xref href="GUID-683603DD-F3D3-3193-BEB3-8236C7DE7F79.dita"><apiname>RWindow</apiname></xref> inherits
+from <xref href="GUID-1460DD8F-9AA1-3B99-8FFD-F309959CCA34.dita"><apiname>RWindowBase</apiname></xref>, so you can call the <codeph>Activate()</codeph> function
+on <codeph>RWindow</codeph>. </p> <codeblock id="GUID-DB2FB570-2BB0-5C5F-9E4F-076D6A0E469E" xml:space="preserve">
+window.EnableAdvancedPointers();
+window.Activate();
+</codeblock> <p>When an application needs to receive advanced pointer events
+in a window, it must call <codeph>RWindowBase::EnableAdvancedPointers()</codeph> for
+the window <i>before</i> it is activated. </p> <p>If advanced pointers are
+not enabled for a window, it receives only standard <xref href="GUID-1FFA0073-3D83-388E-A824-08C31F90CC54.dita"><apiname>TPointerEvent</apiname></xref> information
+from a single pointer with no pressure and proximity data. The single pointer
+environment rules describe the way in which pointer events coming from many
+pointers in the multi-pointer model are transformed into events of one pointer.
+They are necessary to ensure that old single-pointer applications work in
+a multi-touch environment intuitively and as expected by the user. </p> <p>However,
+the new <codeph>TPointerEvent</codeph> types, <xref href="GUID-239D0A8B-2759-321D-AD48-976E80192239.dita"><apiname>EEnterCloseProximity</apiname></xref>, <xref href="GUID-8C6264B4-5E19-33A7-92B0-BB79C871BEC7.dita"><apiname>EExitCloseProximity</apiname></xref>, <xref href="GUID-F02DB96E-1541-3223-9B7B-79D45840DB7B.dita"><apiname>EEnterHighPressure</apiname></xref> and <xref href="GUID-15B5991C-B075-3110-B0A4-540EC282AA56.dita"><apiname>EExitHighPressure</apiname></xref>, are delivered to all windows,
+even to those that do not enable advanced pointers. </p> </li>
+</ol> </section>
+<section id="GUID-C026DAB9-C11C-5D29-A1EA-6730E914250F"><title>Getting Z coordinates
+from TPointerEvent</title> <ol id="GUID-4CC2271D-1798-51B3-9A9D-E7E0B9A33DAE">
+<li id="GUID-184B5B63-4EFC-55CD-8D1F-E015EEBACBE2"><p>Call <xref href="GUID-1FFA0073-3D83-388E-A824-08C31F90CC54.dita#GUID-1FFA0073-3D83-388E-A824-08C31F90CC54/GUID-E961DA4D-AD38-31F0-88DD-A07D36346DCB"><apiname>TPointerEvent::AdvancedPointerEvent()</apiname></xref> on
+a <codeph>TPointerEvent</codeph> to return a pointer to a <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita"><apiname>TAdvancedPointerEvent</apiname></xref>. </p> <codeblock id="GUID-6E81680A-3070-546B-B575-49EA9E34FAF9" xml:space="preserve">
+TZType aZType;
+TPointerEvent& aPointerEvent;
+TInt* aZ;
+TInt* aPoint3D;
+
+TAdvancedPointerEvent *advancedP = aPointerEvent.AdvancedPointerEvent();
+</codeblock> <p> <codeph>TPointerEvent</codeph> is a struct that contains
+details of a pointer event. <codeph>TZType</codeph> is a struct provided by
+the programmer containing members to hold proximity, pressure, and "proximity
+and pressure" data. </p> </li>
+<li id="GUID-ABA8FA09-5F57-51BC-8CAE-43649B5ED6D3"><p>Now we need to test
+whether the pointer event contains advanced pointer data. If it is not an
+advanced pointer, the code leaves. </p> <p>If it is an advanced pointer, we
+call functions to detect proximity, pressure, "proximity and pressure" data
+and coordinates. </p> <codeblock id="GUID-DF109643-2564-51A0-B0F6-33BF4DA1F6E3" xml:space="preserve">
+if(!advancedP)
+ {
+ // The TPointerEvent isn't an instance of TAdvancedPointerEvent
+ User::Leave(KErrArgument);
+ }
+
+switch(aZType)
+ {
+ case EZTypeProximity:
+ aZ = advancedP->Proximity();
+ aPoint3D = advancedP->Proximity3D();
+ break;
+ case EZTypePressure:
+ aZ = advancedP->Pressure();
+ aPoint3D = advancedP->Pressure3D();
+ break;
+ case EZTypeProximityAndPressure:
+ aZ = advancedP->ProximityAndPressure();
+ aPoint3D = advancedP->ProximityAndPressure3D();
+ break;
+ default:
+ User::Leave(KErrArgument);
+ break;
+ }
+</codeblock> <ul>
+<li id="GUID-40C01884-AC86-5882-935D-2EC2E27C9004"><p> <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita#GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023/GUID-0ED4B1CC-0655-3246-8645-AAC9E0C27298"><apiname>TAdvancedPointerEvent::Proximity()</apiname></xref> returns
+the proximity. </p> </li>
+<li id="GUID-16A9A86B-A837-5E43-BB3A-F5A04A7F4552"><p> <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita#GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023/GUID-15DEBFBF-7B7D-3FCF-9929-C973824A5FD3"><apiname>TAdvancedPointerEvent::Pressure()</apiname></xref> returns
+the pressure. </p> </li>
+<li id="GUID-3E614890-C317-596E-A5B9-FD76426DBD12"><p> <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita#GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023/GUID-114AE77E-D0BD-321E-BFCB-1388B35582EC"><apiname>TAdvancedPointerEvent::ProximityAndPressure()</apiname></xref> returns
+the proximity and pressure combined. </p> </li>
+<li id="GUID-6F62C0D1-FAE4-5F8F-B451-68ABA404A369"><p> <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita#GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023/GUID-E5AA7737-D217-3FDE-9E4D-AAA7F5D2C300"><apiname>TAdvancedPointerEvent::
+Position3D()</apiname></xref> returns the proximity and the X, Y and Z coordinates. </p> </li>
+<li id="GUID-5AD1811D-BCBF-5A44-B6E7-EB71BF254BCA"><p> <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita#GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023/GUID-2F30A8F5-75BA-3FE3-84B7-3C772ED75857"><apiname>TAdvancedPointerEvent::Pressure3D()</apiname></xref> returns
+the pressure and the X and Y coordinates. </p> </li>
+</ul> <p>Proximity is <i>always</i> negative and pressure is <i>always</i> positive.
+Internally they are combined together as a Z coordinate. When Z > 0, the proximity
+is 0 and the Z value represents the pressure. When Z < 0, the pressure
+is 0 and the Z value represents the proximity. Some APIs use only a Z coordinate
+(such as the threshold getters and setters and <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita#GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023/GUID-114AE77E-D0BD-321E-BFCB-1388B35582EC"><apiname>TAdvancedPointerEvent::ProximityAndPressure()</apiname></xref>).
+In these, the Z coordinate is interpreted in terms of pressure and proximity. </p> </li>
+</ol> <fig id="GUID-7A49B143-5458-5916-B937-55D98B77BB2C">
+<title> Relationships between the pointer proximity, pressure and Z
+ coordinate </title>
+<image href="GUID-1A0FB98B-8DB3-5067-9B71-FF838F6AE402_d0e193926_href.png" placement="inline"/>
+</fig> </section>
+<section id="GUID-B7057F69-191F-5AA4-8C61-EBECE66D92F6"><title>Pinch zooming</title> <p>This
+example shows an easy way to pinch zoom an image when the screen receives
+pointer events from two pointers. There are two functions in this code that
+must be implemented by the programmer: <codeph>BitmapCoordinates()</codeph> and <codeph>MoveBitmap()</codeph>.
+They are not included in the example because they involve complex calculations
+that are not related to advanced pointers. </p> <p>The high-level steps to
+perform pinch zooming are: </p> <ol id="GUID-AEF3917C-AAFE-5C25-9609-396D08478AC0">
+<li id="GUID-7839E665-C4E1-59C8-BA89-22A62615EFA3"><p>Define the coordinates,
+equivalent to the given on-screen coordinates. In the code example, this is
+done using the function <codeph>BitmapCoordinates()</codeph>. </p> </li>
+<li id="GUID-FC4B1BDA-8120-53C9-9C88-BEFEF1AD54B4"><p>Define the ID of the
+pointer by using <xref href="GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023.dita#GUID-FADA3278-FF8B-308F-90AD-3DCF8911A023/GUID-67593D7E-CE40-303F-B847-81D6FC0578B1"><apiname>TAdvancedPointerEvent::PointerNumber()</apiname></xref>.
+If the device can handle two pointers (two fingers) at the same time, their
+numbers are 0 and 1. The pointer number enables you to distinguish a given
+pointer from other pointers. </p> </li>
+<li id="GUID-1E8F7D23-EEAD-5EA5-8863-276076D6B54E"><p>For each pointer assign
+its coordinates to a local variable. We assume there are only two pointers
+handled by the system here. </p> </li>
+<li id="GUID-E44B3D9B-560A-5959-996D-A63CBD4C3786"><p>Use the <codeph>MoveBitmap()</codeph> function
+to achieve the zoom effect. </p> <codeblock id="GUID-D85CCFDD-8F65-530A-ACD7-93DD1D435FC6" xml:space="preserve">
+/**
+Receives pointer events from two pointers to perform Pinch Zoom of the image.
+Function will finish when EButton1Up is received for any of the pointers.
+@param aPointer1 Coordinates of pointer number 1 when zoom is started
+@param aPointer2 Coordinates of pointer number 2 when zoom is started
+*/
+
+void PinchZoom(TPoint aPointer1, TPoint aPointer2)
+ {
+ TPoint actualP1 = aPointer1;
+ TPoint actualP2 = aPointer2;
+
+ // translate on-screen pointer coordinates to coordinates of displayed bitmap
+ TPoint bitmapCatching1 = BitmapCoordinates(aPointer1);
+ TPoint bitmapCatching2 = BitmapCoordinates(aPointer2);
+
+ TBool repaint = EFalse;
+
+ while (ETrue)
+ {
+ TAdvancedPointerEvent event = GetNextPointerEvent();
+
+ if (event.iType == TPointerEvent::EDrag)
+ {
+ if (event.PointerNumber() == 1)
+ {
+ actualP1 = event.iPosition;
+ repaint = ETrue;
+ }
+ else if (event.PointerNumber() == 2)
+ {
+ actualP2 = event.iPosition;
+ repaint = ETrue;
+ }
+ }
+ else if (event.iType == TPointerEvent::EButton1Up)
+ {
+ break;
+ }
+
+ if (repaint)
+ {
+ // move bitmap on the screen in the way that
+ // bitmapCatching1 point of the bitmap will be displayed at actualP1 screen coordinate,
+ // bitmapCatching2 point of the bitmap will be displayed at actualP2 screen coordinate.
+ MoveBitmap(bitmapCatching1, actualP1, bitmapCatching2, actualP2);
+ repaint = EFalse;
+ }
+ }
+ }
+</codeblock> </li>
+</ol> </section>
+</conbody><related-links>
+<link href="GUID-9C269F45-F160-5A4B-ABF8-896D2A538E3B.dita"><linktext>Advanced
+Pointer Overview</linktext></link>
+<link href="GUID-9AD75103-CD56-5279-B639-5CA2BBF979B5.dita"><linktext>Advanced
+Pointer States and Event Communication</linktext></link>
</related-links></concept>
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