calculatePointersDistance( p0, p1 ) {

		return Math.sqrt( Math.pow( p1.clientX - p0.clientX, 2 ) + Math.pow( p1.clientY - p0.clientY, 2 ) );

	}
Calculates the distance between two pointers.

@private
@param {PointerEvent} p0 - The first pointer.
@param {PointerEvent} p1 - The second pointer.
@returns {number} The distance between the two pointers.