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| SDL_JoystickGetBall(3) | SDL API Reference | SDL_JoystickGetBall(3) |
NAME
SDL_JoystickGetBall - Get relative trackball motionSYNOPSIS
#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 failureEXAMPLES
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 ALSO
SDL_JoystickNumBalls| Tue 11 Sep 2001, 23:00 | SDL |
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