SDL_MouseMotionEvent- Mouse motion event structure
Uint16 x, y;
Sint16 xrel, yrel;
The current button state
The X/Y coordinates of the mouse
Relative motion in the X/Y direction
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.