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Source file src/image/draw/example_test.go

Documentation: image/draw

  // Copyright 2016 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 draw_test
  
  import (
  	"fmt"
  	"image"
  	"image/color"
  	"image/draw"
  	"math"
  )
  
  func ExampleDrawer_floydSteinberg() {
  	const width = 130
  	const height = 50
  
  	im := image.NewGray(image.Rectangle{Max: image.Point{X: width, Y: height}})
  	for x := 0; x < width; x++ {
  		for y := 0; y < height; y++ {
  			dist := math.Sqrt(math.Pow(float64(x-width/2), 2)/3+math.Pow(float64(y-height/2), 2)) / (height / 1.5) * 255
  			var gray uint8
  			if dist > 255 {
  				gray = 255
  			} else {
  				gray = uint8(dist)
  			}
  			im.SetGray(x, y, color.Gray{Y: 255 - gray})
  		}
  	}
  	pi := image.NewPaletted(im.Bounds(), []color.Color{
  		color.Gray{Y: 255},
  		color.Gray{Y: 160},
  		color.Gray{Y: 70},
  		color.Gray{Y: 35},
  		color.Gray{Y: 0},
  	})
  
  	draw.FloydSteinberg.Draw(pi, im.Bounds(), im, image.ZP)
  	shade := []string{" ", "░", "▒", "▓", "█"}
  	for i, p := range pi.Pix {
  		fmt.Print(shade[p])
  		if (i+1)%width == 0 {
  			fmt.Print("\n")
  		}
  	}
  }
  

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