SDL_JoyBallEvent

A structure that contains joystick trackball motion event information.

Contents

SDL_JoyBallEvent

Data Fields

Uint32	type	SDL_JOYBALLMOTION
Uint32	timestamp	timestamp of the event
SDL_JoystickID	which	the instance id of the joystick that reported the event
Uint8	ball	the index of the trackball that changed
Sint16	xrel	the relative motion in the X direction
Sint16	yrel	the relative motion in the Y direction

Code Examples

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Remarks

SDL_JoyBallEvent is a member of the SDL_Event union and is used when an event of type SDL_JOYBALLMOTION is reported. You would access it through the event's jball field.

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).