"SDL_JoystickGetBall" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference"
"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
created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00
