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  • import "image/draw"

  • Overview

  • Index

  • Examples

概觀

Package draw提供圖像合成功能。

有關(guān)此軟件包的介紹,請參閱“Go圖像/繪制軟件包”:https://golang.org/doc/articles/image_draw.html

索引

  • func Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point, op Op)

  • func DrawMask(dst Image, r image.Rectangle, src image.Image, sp image.Point, mask image.Image, mp image.Point, op Op)

  • type Drawer

  • type Image

  • type Op

  • func (op Op) Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point)

  • type Quantizer

例子

Drawer (FloydSteinberg)

包文件

draw.go

func Draw

func Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point, op Op)

Draw 通過一個零掩碼調(diào)用 DrawMask

func DrawMask

func DrawMask(dst Image, r image.Rectangle, src image.Image, sp image.Point, mask image.Image, mp image.Point, op Op)

DrawMask將dst中的r.Min與src中的sp和mask中的mp對齊,然后用Porter-Duff組合的結(jié)果替換dst中的矩形r。一個無面具被視為不透明。

type Drawer

Drawer 包含Draw方法。

type Drawer interface {        // Draw aligns r.Min in dst with sp in src and then replaces the        // rectangle r in dst with the result of drawing src on dst.        Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point)}

FloydSteinberg是一個抽屜,是Floyd-Steinberg誤差擴散的Src操作。

var FloydSteinberg Drawer = floydSteinberg{}

示例(FloydSteinberg)

package mainimport ("fmt""image""image/color""image/draw""math")func main() {const width = 130const 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) * 255var gray uint8if 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")}}}

type Image

Image是一個image.Image,使用Set方法更改單個像素。

type Image interface {
        image.Image        Set(x, y int, c color.Color)}

type Op

Op是Porter-Duff合成操作員。

type Op int
const (        // Over specifies ``(src in mask) over dst''.
        Over Op = iota        // Src specifies ``src in mask''.
        Src)

func (Op) Draw

func (op Op) Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point)

Draw通過調(diào)用Drawer接口操作來實現(xiàn)抽屜界面。

type Quantizer

Quantizer為圖像生成調(diào)色板。

type Quantizer interface {        // Quantize appends up to cap(p) - len(p) colors to p and returns the        // updated palette suitable for converting m to a paletted image.        Quantize(p color.Palette, m image.Image) color.Palette}
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