SDL_JoystickGetBall

Langue: en

Autres versions - même langue

Version: 45528 (openSuse - 09/10/07)

Section: 3 (Bibliothèques de fonctions)

Sommaire

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