class Rectangle
_width:number
_height:number
_x:number
_y:number
class Model
_transform:Transform
_id:number
+move(dx:number,dy:number):void
+scale(dx:number,dy:number):void
class NodeModel
_joints:Array<Joint>
+connect(to:NodeModel):void
class Circle
_center:Point
_radius:number
+getCenter():Point
这里是评论
