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SDL_JoystickGetBall

Section: SDL API Reference (3)
Updated: Tue 11 Sep 2001, 23:00
Index Return to Main Contents
 

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


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
EXAMPLES
SEE ALSO




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