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draw.go
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draw.go
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/**
* @Author Awen
* @Description Captcha Draw
* @Date 2021/7/18
* @Email wengaolng@gmail.com
**/
package captcha
import (
"fmt"
"github.com/golang/freetype"
"golang.org/x/image/draw"
"image"
"image/color"
"image/jpeg"
"io/ioutil"
"math"
mRand "math/rand"
"os"
)
type DrawDot struct{
Dx int
Dy int
FontDPI int
Text string
Size int
Width int
Height int
Angle int
Color string
Font string
}
/**
* @Description: 验证码画图
*/
type DrawCanvas struct{
// 长、高
Width int
Height int
// 背景图片
Background string
// 缩略图扭曲程度,值为 ThumbBackgroundDistort...,
BackgroundDistort int
// 缩略图小圆点数量
BackgroundCirclesNum int
// 缩略图线条数量
BackgroundSlimLineNum int
// 文本透明度
TextAlpha float64
CaptchaDrawDot []*DrawDot
}
/**
* @Description: 区域点信息
*/
type AreaPoint struct {
MinX, MaxX, MinY, MaxY int
}
/**
* @Description: 验证码画图
*/
type Draw struct{}
/**
* @Description: 创建 Palette 带调包板画布
* @receiver cd
* @param params
* @param colorArr
* @return *Palette
*/
func (cd *Draw) CreateCanvasWithPalette(params *DrawCanvas, colorArr []color.RGBA) *Palette {
width := params.Width
height := params.Height
p := []color.Color{
color.RGBA{R: 0xFF, G: 0xFF, B: 0xFF, A: 0x00},
}
for _, co := range colorArr {
p = append(p, co)
}
return NewPalette(image.Rect(0, 0, width, height), p)
}
/**
* @Description: 创建 NRGBA 画布
* @receiver cd
* @param params
* @param isAlpha
* @return *image.NRGBA
*/
func (cd *Draw) CreateCanvas(params *DrawCanvas, isAlpha bool) *image.NRGBA {
width := params.Width
height := params.Height
img := image.NewNRGBA(image.Rect(0, 0, width, height))
// 画背景
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
if isAlpha {
img.Set(x, y, color.Alpha{A: uint8(0)})
} else {
img.Set(x, y, color.RGBA{R: 255, G: 255, B: 255, A: 255})
}
}
}
return img
}
/**
* @Description: 画图
* @receiver cd
* @param params
* @return image.Image
* @return error
*/
func (cd *Draw) Draw(params *DrawCanvas) (image.Image, error) {
dots := params.CaptchaDrawDot
canvas := cd.CreateCanvas(params, true)
for _, dot := range dots {
textImg, areaPoint, _ := cd.DrawTextImg(dot, params)
minX := areaPoint.MinX
maxX := areaPoint.MaxX
minY := areaPoint.MinY
maxY := areaPoint.MaxY
width := maxX - minX
height := maxY - minY
nW := textImg.Bounds().Max.X
nH := textImg.Bounds().Max.Y
for x := 0; x < nW; x++ {
for y := 0; y < nH; y++ {
co := textImg.At(x, y)
if _, _, _, a := co.RGBA(); a > 0 {
if x >= minX && x <= maxX && y >= minY && y <= maxY {
canvas.Set(dot.Dx + (x - minX), dot.Dy - height + (y - minY), textImg.At(x, y))
}
}
}
}
// 重置尺寸
dot.Height = height
dot.Width = width
}
bgFile := params.Background
imgBg, iErr := os.Open(bgFile)
if iErr != nil {
return canvas, iErr
}
img, dErr := jpeg.Decode(imgBg)
if dErr != nil {
return canvas, dErr
}
defer imgBg.Close()
b := canvas.Bounds()
m := image.NewNRGBA(b)
curX , curY:= cd.rangCutImage(params.Width, params.Height, img)
draw.Draw(m, b, img, image.Point{X: curX , Y: curY}, draw.Src)
draw.Draw(m, canvas.Bounds(), canvas, image.Point{}, draw.Over)
subImg := m.SubImage(image.Rect(0, 0, params.Width, params.Height)).(*image.NRGBA)
return subImg, nil
}
/**
* @Description: 使用调色板的画布画图
* @receiver cd
* @param params
* @param colorA
* @param colorB
* @return image.Image
* @return error
*/
func (cd *Draw) DrawWithPalette(params *DrawCanvas, colorA []color.Color, colorB []color.Color) (image.Image, error) {
dots := params.CaptchaDrawDot
p := []color.Color{
color.RGBA{R: 0xFF, G: 0xFF, B: 0xFF, A: 0x00},
}
for _, co := range colorA {
p = append(p, co)
}
for _, co := range colorB {
p = append(p, co)
}
canvas := NewPalette(image.Rect(0, 0, params.Width, params.Height), p)
//cd.strikeThrough(canvas, 2)
if params.BackgroundCirclesNum > 0 {
cd.fillWithCircles(canvas, params.BackgroundCirclesNum, 1, 2)
}
if params.BackgroundSlimLineNum > 0 {
cd.drawSlimLine(canvas, params.BackgroundSlimLineNum, colorB)
}
for _, dot := range dots {
// 读字体数据
fontBytes, err := ioutil.ReadFile(dot.Font)
if err != nil {
return canvas, err
}
fontN, err := freetype.ParseFont(fontBytes)
if err != nil {
return canvas, err
}
dc := freetype.NewContext()
dc.SetDPI(float64(dot.FontDPI))
dc.SetFont(fontN)
dc.SetClip(canvas.Bounds())
dc.SetDst(canvas)
// 文字大小
dc.SetFontSize(float64(dot.Size))
// 文字颜色
hexColor, _ := ParseHexColor(dot.Color)
fontColor := image.NewUniform(hexColor)
dc.SetSrc(fontColor)
// 画文本
text := fmt.Sprintf("%s", dot.Text)
pt := freetype.Pt(dot.Dx, dot.Dy) // 字出现的位置
_, err = dc.DrawString(text, pt)
}
if params.Background != "" {
bgFile := params.Background
imgBg, iErr := os.Open(bgFile)
if iErr != nil {
return canvas, iErr
}
img, dErr := jpeg.Decode(imgBg)
if dErr != nil {
return canvas, dErr
}
defer imgBg.Close()
b := img.Bounds()
m := image.NewNRGBA(b)
curX , curY:= cd.rangCutImage(params.Width, params.Height, img)
draw.Draw(m, b, img, image.Point{X: curX, Y: curY}, draw.Src)
canvas.distort(float64(RandInt(5, 10)), float64(RandInt(120, 200)))
draw.Draw(m, canvas.Bounds(), canvas, image.Point{}, draw.Over)
rc := m.SubImage(image.Rect(0, 0, params.Width, params.Height)).(*image.NRGBA)
return rc, nil
}
if params.BackgroundDistort > 0 {
canvas.distort(float64(RandInt(5, 10)), float64(params.BackgroundDistort))
}
return canvas, nil
}
/**
* @Description: 随机裁剪图片位置
* @receiver cd
* @param width
* @param height
* @param img
* @return x
* @return y
*/
func (cd *Draw) rangCutImage(width int, height int, img image.Image) (int, int) {
b := img.Bounds()
iW := b.Max.X
iH := b.Max.Y
curX := 0
curY := 0
if iW - width > 0 {
curX = RandInt(0, iW - width)
}
if iH - height > 0 {
curY = RandInt(0, iH - height)
}
return curX, curY
}
/**
* @Description: 随机获取颜色
* @param strs
* @return color.RGBA
*/
func (cd *Draw) genRandColor(co []color.Color) color.RGBA {
colorLen := len(co)
index := RandInt(0, colorLen)
if index >= colorLen {
index = colorLen - 1
}
r, g, b, a := co[index].RGBA()
return color.RGBA{R: uint8(r), G: uint8(g), B: uint8(b), A: uint8(a)}
}
/**
* @Description: 根据
* @receiver cd
* @param dot
* @param params
* @return *Palette
* @return *AreaPoint
* @return error
*/
func (cd *Draw) DrawTextImg(dot *DrawDot, params *DrawCanvas) (*Palette, *AreaPoint, error) {
co, _ := ParseHexColor(dot.Color)
var coArr = []color.RGBA {
co,
}
co.A = cd.formatAlpha(params.TextAlpha)
canvas := cd.CreateCanvasWithPalette(&DrawCanvas{
Width: dot.Width + 10,
Height: dot.Height + 10,
}, coArr)
// 读字体数据
fontBytes, err := ioutil.ReadFile(dot.Font)
if err != nil {
return canvas, nil, err
}
fontN, err := freetype.ParseFont(fontBytes)
if err != nil {
return canvas, nil, err
}
dc := freetype.NewContext()
dc.SetDPI(float64(dot.FontDPI))
dc.SetFont(fontN)
dc.SetClip(canvas.Bounds())
dc.SetDst(canvas)
// 文字大小
dc.SetFontSize(float64(dot.Size))
// 文字颜色
hexColor, _ := ParseHexColor(dot.Color)
fontColor := image.NewUniform(hexColor)
dc.SetSrc(fontColor)
// 画文本
text := fmt.Sprintf("%s", dot.Text)
pt := freetype.Pt(12, dot.Height - 5) // 字出现的位置
if IsChineseChar(text) {
pt = freetype.Pt(10, dot.Height) // 字出现的位置
}
_, err = dc.DrawString(text, pt)
if err != nil {
return nil, nil, err
}
// 旋转
canvas.Rotate(dot.Angle)
if params.BackgroundDistort > 0 {
canvas.distort(float64(RandInt(5, 10)), float64(params.BackgroundDistort))
}
// 计算裁剪
ap := cd.calcImageSpace(canvas)
return canvas, ap, nil
}
/**
* @Description: 计算剪裁空白多余空白
* @receiver cd
* @param pa
* @return *AreaPoint
*/
func (cd *Draw) calcImageSpace (pa *Palette) *AreaPoint {
nW := pa.Bounds().Max.X
nH := pa.Bounds().Max.Y
// 计算裁剪的最小及最大的坐标
minX := nW
maxX := 0
minY := nH
maxY := 0
for x := 0; x < nW; x++ {
for y := 0; y < nH; y++ {
co := pa.At(x, y)
if _, _, _, a := co.RGBA(); a > 0 {
if x < minX {
minX = x
} else if x > maxX{
maxX = x
}
if y < minY {
minY = y
} else if y > maxY{
maxY = y
}
}
}
}
minX = int(math.Max(float64(minX), float64(minX-5)))
maxX = int(math.Min(float64(maxX), float64(maxX+5)))
minY = int(math.Max(float64(minY), float64(minY-5)))
maxY = int(math.Min(float64(maxY), float64(maxY+5)))
return &AreaPoint{
minX,
maxX,
minY,
maxY,
}
}
/**
* @Description: 格式透明度
* @receiver cd
* @param val
* @return uint8
*/
func (cd *Draw) formatAlpha(val float64) uint8 {
a := math.Min(val, 1)
alpha := a * 255
return uint8(alpha)
}
/**
* @Description: 将图片居中处理
* @param m
* @return image.Image
*/
func (cd *Draw) centerWithImage(m image.Image) image.Image {
max := m.Bounds().Dx()
temp := (max - m.Bounds().Dy()) / 2
centerImage := image.NewRGBA(image.Rect(0, 0, max, max))
for x := m.Bounds().Min.X; x < m.Bounds().Max.X; x++ {
for y := m.Bounds().Min.Y; y < m.Bounds().Max.Y; y++ {
centerImage.Set(x, temp+y, m.At(x, y))
}
}
return centerImage
}
/**
* @Description: 画中心线
* @receiver cd
* @param m
* @param dotSize
*/
func (cd *Draw)strikeThrough(m *Palette, dotSize int) {
maxx := m.Bounds().Max.X
maxy := m.Bounds().Max.Y
y := RandInt(maxy/3, maxy-maxy/3)
amplitude := RandFloat(5, 20)
period := RandFloat(80, 180)
dx := 2.0 * math.Pi / period
for x := 0; x < maxx; x++ {
xo := amplitude * math.Cos(float64(y) * dx)
yo := amplitude * math.Sin(float64(x) * dx)
for yn := 0; yn < dotSize; yn++ {
r := RandInt(0, dotSize)
m.drawCircle(x + int(xo), y + int(yo) + (yn * dotSize), r / 2, 1)
}
}
}
/**
* @Description: 画N条随机细线
* @receiver cd
* @param m
* @param num
* @param colorB
*/
func (cd *Draw)drawSlimLine(m *Palette, num int, colorB []color.Color) {
first := m.Bounds().Max.X / 10
end := first * 9
y := m.Bounds().Max.Y / 3
for i := 0; i < num; i++ {
point1 := Point{X: mRand.Intn(first), Y: mRand.Intn(y)}
point2 := Point{X: mRand.Intn(first) + end, Y: mRand.Intn(y)}
if i % 2 == 0 {
point1.Y = mRand.Intn(y) + y * 2
point2.Y = mRand.Intn(y)
} else {
point1.Y = mRand.Intn(y) + y*(i % 2)
point2.Y = mRand.Intn(y) + y * 2
}
m.drawBeeline(point1, point2, cd.genRandColor(colorB))
}
}
/**
* @Description: 随意填充小圆点
* @receiver cd
* @param m
* @param n
* @param maxRadius
* @param circleCount
*/
func (cd *Draw)fillWithCircles(m *Palette, n, maxRadius int, circleCount int) {
maxx := m.Bounds().Max.X
maxy := m.Bounds().Max.Y
for i := 0; i < n; i++ {
colorIdx := uint8(RandInt(1, circleCount-1))
r := RandInt(1, maxRadius)
m.drawCircle(RandInt(r, maxx-r), RandInt(r, maxy-r), r, colorIdx)
}
}