A pointer that is down moved: drags scroll with it, a pinch zooms by the change of the fingers' distance about their centre and pans with the centre.
public void PointerMove(long pointerId, double x, double y)
The pointer's identifier; pointers that are not down (a hovering mouse) are ignored.
The x in device-independent pixels.
The y in device-independent pixels.
Spec #33 viewer capability 14.