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-rw-r--r--doc/progs/image_package3.go15
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diff --git a/doc/progs/image_package3.go b/doc/progs/image_package3.go
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+++ b/doc/progs/image_package3.go
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+// 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.
+
+package main
+
+import (
+ "fmt"
+ "image"
+)
+
+func main() {
+ r := image.Rect(2, 1, 5, 5).Add(image.Pt(-4, -2))
+ fmt.Println(r.Dx(), r.Dy(), image.Pt(0, 0).In(r)) // prints 3 4 true
+}