Just another update

Task/Bitmap/Go/bitmap-1.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"image"
+	"image/color"
+	"image/draw"
+	"image/png"
+)
+
+func main() {
+	// A rectangle from 0,0 to 300,240.
+	r := image.Rect(0, 0, 300, 240)
+
+	// Create an image
+	im := image.NewNRGBA(r)
+
+	// set some color variables for convience
+	var (
+		red  = color.RGBA{0xff, 0x00, 0x00, 0xff}
+		blue = color.RGBA{0x00, 0x00, 0xff, 0xff}
+	)
+
+	// Fill with a uniform color
+	draw.Draw(im, r, &image.Uniform{red}, image.ZP, draw.Src)
+
+	// Set individual pixels
+	im.Set(10, 20, blue)
+	im.Set(20, 30, color.Black)
+	im.Set(30, 40, color.RGBA{0x10, 0x20, 0x30, 0xff})
+
+	// Get the values of specific pixels as color.Color types.
+	// The color will be in the color.Model of the image (in this
+	// case color.NRGBA) but color models can convert their values
+	// to other models.
+	c1 := im.At(0, 0)
+	c2 := im.At(10, 20)
+
+	// or directly as RGB components (scaled values)
+	redc, greenc, bluec, _ := c1.RGBA()
+	redc, greenc, bluec, _ = im.At(30, 40).RGBA()
+
+	// Images can be read and writen in various formats
+	var buf bytes.Buffer
+	err := png.Encode(&buf, im)
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	fmt.Println("Image size:", im.Bounds().Dx(), "×", im.Bounds().Dy())
+	fmt.Println(buf.Len(), "bytes when encoded as PNG.")
+	fmt.Printf("Pixel at %7v is %v\n", image.Pt(0, 0), c1)
+	fmt.Printf("Pixel at %7v is %#v\n", image.Pt(10, 20), c2) // %#v shows type details
+	fmt.Printf("Pixel at %7v has R=%d, G=%d, B=%d\n",
+		image.Pt(30, 40), redc, greenc, bluec)
+}