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 rela-
tive 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_JoystickGetBall
SDL Tue 11 Sep 2001, 22:59 SDL_JoyBallEvent(3)
Check Out this Related Man Page
SDL_MouseMotionEvent(3) SDL API Reference SDL_MouseMotionEvent(3)NAME
SDL_MouseMotionEvent - Mouse motion event structure
STRUCTURE DEFINITION
typedef struct{
Uint8 type;
Uint8 state;
Uint16 x, y;
Sint16 xrel, yrel;
} SDL_MouseMotionEvent;
STRUCTURE DATA
type SDL_MOUSEMOTION
state The current button state
x, y The X/Y coordinates of the mouse
xrel, yrel Relative motion in the X/Y direction
DESCRIPTION
SDL_MouseMotionEvent is a member of the SDL_Event union and is used when an event of type SDL_MOUSEMOTION is reported.
Simply put, a SDL_MOUSEMOTION type event occurs when a user moves the mouse within the application window or when SDL_WarpMouse is called.
Both the absolute (x and y) and relative (xrel and yrel) coordinates are reported along with the current button states (state). The button
state can be interpreted using the SDL_BUTTON macro (see SDL_GetMouseState).
If the cursor is hidden (SDL_ShowCursor(0)) and the input is grabbed (SDL_WM_GrabInput(SDL_GRAB_ON)), then the mouse will give relative
motion events even when the cursor reaches the edge fo the screen. This is currently only implemented on Windows and Linux/Unix-a-likes.
SEE ALSO
SDL_Event, SDL_MouseButtonEvent
SDL Tue 11 Sep 2001, 22:59 SDL_MouseMotionEvent(3)
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