Dragging Example

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Been playing with the dragging example in pixi.js (example 8), my questions are around the following snippet (line 82: index.html):


		bunny.mousemove = bunny.touchmove = function(data)		{			if(this.dragging)			{				// need to get parent coords..				var newPosition = this.data.getLocalPosition(this.parent);				this.position.x = newPosition.x;				this.position.y = newPosition.y;			}		}


  1.  Why do we need the parent position, as in will it be different to the sprite's dragged position over some common area? Are children's coordinate space relative to the parent rather than something like the global stage?
  2. What exactly is this.position on the sprite -- is it the anchor point, or top-left corner?


Thanks for your help.

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