SDL_JoyBallEvent
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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(3), Joystick Functions, SDL_JoystickEventState(3), SDL_JoystickGetBall(3)

COPYRIGHT

This manual page is taken from the SDL library, licensed under GNU LGPL.
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