package util
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import (
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"basic.com/pubsub/protomsg.git"
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"basic.com/valib/godraw.git"
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"image"
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"image/color"
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)
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// 按尺寸去切图
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func SubCutImg(src *protomsg.Image, rect *protomsg.Rect, enlarge int) ([]byte, error){
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bkImg, _ := godraw.ToImage(src.Data, int(src.Width), int(src.Height))
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rectNew := image.Rect(EnlargeCut(rect, int(src.Width), int(src.Height), enlarge))
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subImg := bkImg.(*image.RGBA).SubImage(rectNew)
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bytes,err := godraw.ImageToJpeg(subImg, nil)
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if err != nil {
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return nil, err
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}
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return bytes, nil
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}
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// 长宽变为一比一，每边各扩百分之...
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func EnlargeCut(rect *protomsg.Rect, maxW,maxH int, enlargePer int) (x0_new, y0_new, x1_new, y1_new int) {
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// 先把长宽变为一比一
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x0 := int(rect.Left)
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y0 := int(rect.Top)
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x1 := int(rect.Right)
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y1 := int(rect.Bottom)
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chazhi := (y1 - y0) - (x1 - x0)
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x0 = x0 - chazhi/2
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if x0 < 0 {
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x0 = 0
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}
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x1 = x1 + chazhi/2
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if x1 > maxW {
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x1 = maxW
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}
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// 再把每边各扩大百分之...
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enlarge := float32(enlargePer / 100)
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x0_new = int((1+enlarge)*float32(x0) - enlarge*float32(x1))
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if x0_new < 0 {
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x0_new = 0
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}
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x1_new = int((1+enlarge)*float32(x1) - enlarge*float32(x0))
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if x1_new > maxW {
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x1_new = maxW
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}
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y0_new = int((1+enlarge)*float32(y0) - enlarge*float32(y1))
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if y0_new < 0 {
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y0_new = 0
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}
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y1_new = int((1+enlarge)*float32(y1) - enlarge*float32(y0))
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if y1_new > maxH {
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y1_new = maxH
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}
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return x0_new, y0_new, x1_new, y1_new
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}
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// 长宽变为一比一，每边各扩百分之20
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func EnlargeSizeForCar(x0, y0, x1, y1 int, i protomsg.Image) (x0_new, y0_new, x1_new, y1_new int) {
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// 先把长宽变为一比一
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chazhi := (y1 - y0) - (x1 - x0)
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x0 = x0 - chazhi/2
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if x0 < 0 {
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x0 = 0
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}
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x1 = x1 + chazhi/2
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if x1 > int(i.Width) {
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x1 = int(i.Width)
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}
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// 再把每边各扩大百分之20
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enlarge := float32(0.2)
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x0_new = int((1+enlarge)*float32(x0) - enlarge*float32(x1))
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if x0_new < 0 {
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x0_new = 0
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}
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x1_new = int((1+enlarge)*float32(x1) - enlarge*float32(x0))
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if x1_new > int(i.Width) {
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x1_new = int(i.Width)
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}
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y0_new = int((1+enlarge)*float32(y0) - enlarge*float32(y1))
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if y0_new < 0 {
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y0_new = 0
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}
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y1_new = int((1+enlarge)*float32(y1) - enlarge*float32(y0))
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if y1_new > int(i.Height) {
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y1_new = int(i.Height)
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}
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return
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}
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// 不扩边
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func EnlargeSize(x0, y0, x1, y1 int, i protomsg.Image) (int, int, int, int) {
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// 先把长宽变为一比一
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chazhi := (y1 - y0) - (x1 - x0)
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x0 = x0 - chazhi/2
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if x0 < 0 {
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x0 = 0
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}
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x1 = x1 + chazhi/2
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if x1 > int(i.Width) {
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x1 = int(i.Width)
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}
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if y0 < 0 {
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y0 = 0
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}
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if y1 > int(i.Height) {
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y1 = int(i.Height)
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}
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return x0, y0, x1, y1
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}
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// 长宽变为一比一，每边各扩百分之50
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func EnlargeSizeForTem(x0, y0, x1, y1 int, i protomsg.Image) (x0_new, y0_new, x1_new, y1_new int) {
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// 先把长宽变为一比一
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chazhi := (y1 - y0) - (x1 - x0)
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x0 = x0 - chazhi/2
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if x0 < 0 {
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x0 = 0
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}
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x1 = x1 + chazhi/2
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if x1 > int(i.Width) {
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x1 = int(i.Width)
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}
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// 再把每边各扩大百分之50
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enlarge := float32(0.5)
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x0_new = int((1+enlarge)*float32(x0) - enlarge*float32(x1))
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if x0_new < 0 {
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x0_new = 0
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}
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x1_new = int((1+enlarge)*float32(x1) - enlarge*float32(x0))
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if x1_new > int(i.Width) {
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x1_new = int(i.Width)
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}
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y0_new = int((1+enlarge)*float32(y0) - enlarge*float32(y1))
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if y0_new < 0 {
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y0_new = 0
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}
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y1_new = int((1+enlarge)*float32(y1) - enlarge*float32(y0))
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if y1_new > int(i.Height) {
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y1_new = int(i.Height)
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}
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return
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}
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func drawLine(img *image.RGBA, x0, y0, x1, y1 int, c color.Color) {
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var dx int
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if x1 > x0 {
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dx = x1 - x0
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} else {
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dx = x0 - x1
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}
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var dy int
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if y1 > y0 {
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dy = y1 - y0
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} else {
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dy = y0 - y1
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}
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sx, sy := 1, 1
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if x0 >= x1 {
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sx = -1
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}
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if y0 >= y1 {
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sy = -1
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}
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err := dx - dy
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for {
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img.Set(x0, y0, c)
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if x0 == x1 && y0 == y1 {
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return
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}
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e2 := err * 2
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if e2 > -dy {
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err -= dy
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x0 += sx
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}
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if e2 < dx {
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err += dx
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y0 += sy
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}
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}
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}
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func DrawRect(img *image.RGBA, x0, y0, x1, y1 int, c color.Color) {
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drawLine(img, x0, y0, x1, y0, c)
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drawLine(img, x1, y0, x1, y1, c)
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drawLine(img, x1, y1, x0, y1, c)
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drawLine(img, x0, y1, x0, y0, c)
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}
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