class Square { public var top:Number=0; public var left:Number=0; public var right:Number=0; public var bottom:Number=0; public var width:Number=0; public var height:Number=0; public function Square( left:Number, top:Number, right:Number, bottom:Number ) { this.top = top; this.left = left; this.right = right; this.bottom = bottom; this.width = right-left; this.height = bottom-top; } }