 	background = new P.Raster
 		source: '//hufkens.net/wp-content/uploads/2012/10/bumba-win8.png'
 		position: new P.Point P.view.center.x, .7 * P.view.center.y
-		opacity: .7
 
 	background.onLoad = () ->
 		@size = new P.Size P.view.size.width, .7 * P.view.size.height

		dragging = false

	tool.onMouseMove = (event) ->
		return unless actualPiece
		dragging = true
		actualPiece.group.position.x += event.delta.x
		actualPiece.group.position.y += event.delta.y


)(paper)
		pieceGroup.strokeColor = 'black'

		pieces.push
			zone: dropZone
			edge: pieceEdge
			group: pieceGroup

