SDL_JoystickGetBall

Langue: en

Autres versions - même langue

Version: 121962 (mandriva - 01/05/08)

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