Example of generating an image

pic/pic.go

@@ -0,0 +1,43 @@
+// Copyright 2011 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 pic
+
+import (
+	"bytes"
+	"image"
+	"image/png"
+	"log"
+	"os"
+)
+
+func CalculateImage(f func(int, int) [][]uint8) image.Image {
+	const (
+		dx = 256
+		dy = 256
+	)
+	data := f(dx, dy)
+	m := image.NewNRGBA(image.Rect(0, 0, dx, dy))
+	for y := 0; y < dy; y++ {
+		for x := 0; x < dx; x++ {
+			v := data[y][x]
+			i := y*m.Stride + x*4
+			m.Pix[i] = v
+			m.Pix[i+1] = v
+			m.Pix[i+2] = 255
+			m.Pix[i+3] = 255
+		}
+	}
+	return m
+}
+
+func SaveImage(filename string, m image.Image) {
+	var buf bytes.Buffer
+	png.Encode(&buf, m)
+	if outfile, err := os.Create(filename); err != nil {
+		log.Fatal(err)
+	} else {
+		buf.WriteTo(outfile)
+	}
+}