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## 7.15 glutTabletMotionFunc

`glutTabletMotionFunc` sets the special keyboard callback for the current window.

Usage

    void glutTabletMotionFunc(void (*func)(int x, int y));

`func`
  The new entry callback function.

Description

`glutTabletMotionFunc` sets the tablet motion callback for the current window. The tablet motion callback for a window is called when the window has tablet input focus (normally, when the mouse is in the window) and the user generates tablet motion. The `x` and `y` callback parameters indicate the absolute position of the tablet ``puck'' on the tablet. The callback parameters are normalized to be within the range of 0 to 2000 inclusive.

Registering a tablet motion callback when a tablet device is not available is ineffectual and not an error. In this case, no tablet motion callbacks will be generated.

Passing `NULL` to `glutTabletMotionFunc` disables the generation of tablet motion callbacks. When a new window is created, no tablet motion callback is initially registered.

Next: 7.16 glutTabletButtonFunc Up: 7 Callback Registration Previous: 7.14 glutDialsFunc