SDL_JoyBallEvent(3) SDL API Reference SDL_JoyBallEvent(3)
NAME
SDL_JoyBallEvent - Joystick trackball motion event structure
STRUCTURE DEFINITION
typedef struct{
Uint8 type;
Uint8 which;
Uint8 ball;
Sint16 xrel, yrel;
} SDL_JoyBallEvent;
STRUCTURE DATA
type SDL_JOYBALLMOTION
which Joystick device index
ball Joystick trackball index
xrel, yrel The relative motion in the X/Y direction
DESCRIPTION
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.
SEE ALSO
SDL_Event, Joystick Functions, SDL_JoystickEventState, SDL_JoystickGet-
Ball
SDL Tue 11 Sep 2001, 22:59 SDL_JoyBallEvent(3)
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