layer.draggable.layerStartPoint < object>

Get the x and y position of a draggable layer. (Read-only)
译：获取一个可拖动层的x和y位置。 （只读）

layerA = new Layer
layerA.draggable.enabled = true

# On DragStart, get the current x and y position  
layerA.on Events.DragStart, ->
    print layerA.draggable.layerStartPoint