// Copyright 2012 The Go Authors. All rights reserved.// Use of this source code is governed by a BSD-style// license that can be found in the LICENSE file.packagemainimport("fmt""image")funcmain(){r:=image.Rect(2,1,5,5)// Dx and Dy return a rectangle's width and height.fmt.Println(r.Dx(),r.Dy(),image.Pt(0,0).In(r))// prints 3 4 false}