package image
Golang image.Rectangle.Sub and Union functions usage example.
package main
import (
"fmt"
"image"
"runtime"
)
func main() {
// maximize CPU usage for maximum performance
runtime.GOMAXPROCS(runtime.NumCPU())
// define a rectangle
rect := image.Rect(0, 0, 500, 500)
fmt.Println("Min X : ", rect.Min.X)
fmt.Println("Max X : ", rect.Max.X)
p := image.Pt(20, 100)
// Sub returns the rectangle r translated by -p
subRect := rect.Sub(p)
fmt.Println(subRect)
// Union returns the smallest rectangle that contains both r and s.
unionRect := rect.Union(subRect)
fmt.Println(unionRect)
}
Output :
Min X : 0
Max X : 500
(-20,-100)-(480,400)
(-20,-100)-(500,500)
References :
http://golang.org/pkg/image/#Rectangle.Sub
http://golang.org/pkg/image/#Rectangle.Union
