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SDL_JoyBallEvent(3) SDL API Reference SDL_JoyBallEvent(3)
SDL_JoyBallEvent - Joystick trackball motion event structure
Sint16 xrel, yrel;
which Joystick device index
ball Joystick trackball index
xrel, yrel The relative motion in the X/Y direction
SDL_JoyBallEvent is a member of the SDL_Event union and is used when an event of type
SDL_JOYBALLMOTION is reported.
A SDL_JOYBALLMOTION event occurs when a user moves a trackball on the joystick. The field
which is the index of the joystick that reported the event and ball is the index of the
trackball (for a more detailed explaination see the Joystick section). Trackballs only
return relative motion, this is the change in position on the ball since it was last
polled (last cycle of the event loop) and it is stored in xrel and yrel.
SDL_Event, Joystick Functions, SDL_JoystickEventState, SDL_JoystickGetBall
SDL Tue 11 Sep 2001, 22:59 SDL_JoyBallEvent(3)
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