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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SDL_JoystickOpen(3) SDL API Reference SDL_JoystickOpen(3)NAME
SDL_JoystickOpen - Opens a joystick for use.
SYNOPSIS
#include "SDL.h"
SDL_Joystick *SDL_JoystickOpen(int index);
DESCRIPTION
Opens a joystick for use within SDL. The index refers to the N'th joystick in the system. A joystick must be opened before it game be used.
RETURN VALUE
Returns a SDL_Joystick structure on success. NULL on failure.
EXAMPLES
SDL_Joystick *joy;
// Check for joystick
if(SDL_NumJoysticks()>0){
// Open joystick
joy=SDL_JoystickOpen(0);
if(joy)
{
printf("Opened Joystick 0
");
printf("Name: %s
", SDL_JoystickName(0));
printf("Number of Axes: %d
", SDL_JoystickNumAxes(joy));
printf("Number of Buttons: %d
", SDL_JoystickNumButtons(joy));
printf("Number of Balls: %d
", SDL_JoystickNumBalls(joy));
}
else
printf("Couldn't open Joystick 0
");
// Close if opened
if(SDL_JoystickOpened(0))
SDL_JoystickClose(joy);
}
SEE ALSO
SDL_JoystickClose
SDL Tue 11 Sep 2001, 23:00 SDL_JoystickOpen(3)
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