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SDL_JoystickGetBall(3)         SDL API Reference        SDL_JoystickGetBall(3)

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! "); printf("Trackball Delta- X:%d, Y:%d ", delta_x, delta_y);

SEE ALSO

SDL_JoystickNumBalls SDL Tue 11 Sep 2001, 23:00 SDL_JoystickGetBall(3)

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