export class Rect { x : number ; y : number ; width : number ; height : number ; constructor ( x , y , width , height ) { this . x = x ; this . y = y ; this . width = width ; this . height = height ; } containsPoint ( x , y ) { return ( x >= this . x && y >= this . y && x <= this . x + this . width && y <= this . y + this . height ) ; } }