fcee603081
Previously if the only names defined by _test packages were examples,
the gotest script would emit an incorrect _testmain.go file.
I worked around that by marking the example_test.go files +build ignored.
This CL changes the gotest script to handle this case correctly,
and removes the now-unnecessary build tags.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/214039
From-SVN: r280085
49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
// 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")
|
|
}
|
|
}
|
|
}
|