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Manpages SDL_JoystickGetBallSection: SDL API Reference (3)Updated: Tue 11 Sep 2001, 23:00 Index Return to Main Contents NAMESDL_JoystickGetBall- Get relative trackball motionSYNOPSIS#include "SDL.h" int SDL_JoystickGetBall(SDL_Joystick *joystick, int ball, int *dx, int *dy); DESCRIPTIONGet 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 VALUEReturns 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! "); printf("Trackball Delta- X:%d, Y:%d ", delta_x, delta_y); SEE ALSOSDL_JoystickNumBalls
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