SDL_JoyBallEvent

A structure that contains joystick trackball motion event information.

Contents

Data Fields

Uint32	type	SDL_JOYBALLMOTION
Uint8	which	the index of the joystick that reported the event
Uint8	ball	the index of the trackball that changed
int	xrel	the relative motion in the X direction
int	yrel	the relative motion in the Y direction

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SDL_JoyBallEvent is a member of the SDL_Event structure and is used when an event of type SDL_JOYBALLMOTION is reported.

An SDL_JOYBALLMOTION event occurs when a user moves a trackball on the joystick.

Trackballs only return relative motion. This is the change in position of the ball since it was last polled (last cycle of the event loop).