diff -r ffa851df0825 -r 2fb8b9db1c86 symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/sdljoystickgetball.html --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/sdljoystickgetball.html Fri Jul 31 15:01:17 2009 +0100 @@ -0,0 +1,262 @@ +SDL_JoystickGetBall

SDL Library Documentation
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SDL_JoystickGetBall

Name

SDL_JoystickGetBall -- Get relative trackball motion

Synopsis

#include "SDL.h"

int SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy);

Description

Get the ball axis change.

Trackballs can only return relative motion since the last call to SDL_JoystickGetBall, these motion deltas a placed into dx and dy.

Return Value

Returns 0 on success or -1 on failure

Examples

int delta_x, delta_y;
+SDL_Joystick *joy;
+.
+.
+.
+SDL_JoystickUpdate();
+if(SDL_JoystickGetBall(joy, 0, &delta_x, &delta_y)==-1)
+  printf("TrackBall Read Error!\n");
+printf("Trackball Delta- X:%d, Y:%d\n", delta_x, delta_y);