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// Copyright (c) 2011 CZ.NIC z.s.p.o. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// blame: jnml, labs.nic.cz
// +build ignore
package main
import (
"bytes"
"github.com/cznic/mathutil"
"image"
"image/png"
"io/ioutil"
"log"
"math"
"math/rand"
)
// $ go run example2.go # view rand.png and rnd.png by your favorite pic viewer
//
// see http://www.boallen.com/random-numbers.html
func main() {
sqr := image.Rect(0, 0, 511, 511)
r, err := mathutil.NewFC32(math.MinInt32, math.MaxInt32, true)
if err != nil {
log.Fatal("NewFC32", err)
}
img := image.NewGray(sqr)
for y := 0; y < 512; y++ {
for x := 0; x < 512; x++ {
if r.Next()&1 != 0 {
img.Set(x, y, image.White)
}
}
}
buf := bytes.NewBuffer(nil)
if err := png.Encode(buf, img); err != nil {
log.Fatal("Encode rnd.png ", err)
}
if err := ioutil.WriteFile("rnd.png", buf.Bytes(), 0666); err != nil {
log.Fatal("ioutil.WriteFile/rnd.png ", err)
}
r2 := rand.New(rand.NewSource(0))
img = image.NewGray(sqr)
for y := 0; y < 512; y++ {
for x := 0; x < 512; x++ {
if r2.Int()&1 != 0 {
img.Set(x, y, image.White)
}
}
}
buf = bytes.NewBuffer(nil)
if err := png.Encode(buf, img); err != nil {
log.Fatal("Encode rand.png ", err)
}
if err := ioutil.WriteFile("rand.png", buf.Bytes(), 0666); err != nil {
log.Fatal("ioutil.WriteFile/rand.png ", err)
}
}
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