/
img.go
232 lines (219 loc) · 5.83 KB
/
img.go
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package img
import (
"bytes"
"errors"
"fmt"
"image"
"image/color"
"image/draw"
"image/jpeg"
"image/png"
"io/ioutil"
"os"
"path"
"time"
"github.com/golang/freetype"
"github.com/golang/freetype/truetype"
"github.com/nfnt/resize"
"golang.org/x/image/font"
)
type Img struct {
ImgTpl image.Image
ext string
ImgOut *image.NRGBA
ImgByte bytes.Buffer
}
func NewImage(img_tpl_path string) (img *Img, err error) {
img = new(Img)
imgTplFile, err := os.Open(img_tpl_path)
if err != nil {
return
}
defer imgTplFile.Close()
img.ext = path.Ext(img_tpl_path)
switch img.ext {
case ".jpg":
// if img.ImgTpl, _, err = image.Decode(imgTplFile); err != nil {
// return
// }
if img.ImgTpl, err = jpeg.Decode(imgTplFile); err != nil {
return
}
case ".png":
if img.ImgTpl, err = png.Decode(imgTplFile); err != nil {
return
}
default:
err = errors.New("暂不支持其它类型")
}
img.ImgOut = Image2RGBA(img.ImgTpl)
// img.ImgOut = image.NewNRGBA(image.Rect(0, 0, img.ImgTpl.Bounds().Dx(), img.ImgTpl.Bounds().Dy()))
// draw.Draw(img.ImgOut, img.ImgOut.Bounds(), img.ImgTpl, img.ImgTpl.Bounds().Min, draw.Over)
return
}
//Image2RGBA Image2RGBA
func Image2RGBA(img image.Image) *image.NRGBA {
baseSrcBounds := img.Bounds().Max
newWidth := baseSrcBounds.X
newHeight := baseSrcBounds.Y
des := image.NewNRGBA(image.Rect(0, 0, newWidth, newHeight)) // 底板
//首先将一个图片信息存入jpg
draw.Draw(des, des.Bounds(), img, img.Bounds().Min, draw.Over)
return des
}
func (I *Img) DrawImage(img image.Image, resize_x float32, x, y float32) (err error) {
// 调用resize库进行图片缩放(高度填0,resize.Resize函数中会自动计算缩放图片的宽高比)
resizeTpl := resize.Resize(uint(I.ImgTpl.Bounds().Dx()), 0, I.ImgTpl, resize.Lanczos3)
resizeImg := resize.Resize(uint(I.ImgTpl.Bounds().Dx()*int(resize_x*10))/1000, 0, img, resize.Lanczos3) //大小
// 将两个图片合成一张
I.ImgOut = image.NewNRGBA(image.Rect(0, 0, resizeTpl.Bounds().Max.X, resizeTpl.Bounds().Max.Y))
draw.Draw(I.ImgOut, I.ImgOut.Bounds(), resizeTpl, resizeTpl.Bounds().Min, draw.Over)
draw.Draw(I.ImgOut, I.ImgOut.Bounds(), resizeImg, image.Point{X: (-1) * int(x*10) * resizeTpl.Bounds().Max.X / 1000, Y: (-1) * int(y*10) * resizeTpl.Bounds().Max.Y / 1000}, draw.Over)
return
}
func (I *Img) DrawImageFile(img_path string, resize_x float32, x, y float32) (err error) {
imgFile, err := os.Open(img_path)
if err != nil {
return
}
defer imgFile.Close()
var img image.Image
img, _, err = image.Decode(imgFile)
// img, err = png.Decode(imgFile)
if err != nil {
return
}
err = I.DrawImage(img, resize_x, x, y)
return
}
func (I *Img) PackImage() (err error) {
// w := bufio.NewWriter(&I.ImgByte.)
switch I.ext {
case ".jpg":
err = jpeg.Encode(&I.ImgByte, I.ImgOut, &jpeg.Options{Quality: 90})
case ".png":
err = png.Encode(&I.ImgByte, I.ImgOut)
default:
err = errors.New("未知类型")
}
return
}
func (I *Img) OutImage(file_path string) (err error) {
if I.ImgOut == nil {
err = errors.New("OutImage 不能为空")
return
}
if PathExists(file_path) {
os.Remove(file_path)
}
// 保存文件
imgFile, err := os.Create(file_path)
if err != nil {
return
}
defer imgFile.Close()
switch path.Ext(file_path) {
case ".jpg":
err = jpeg.Encode(imgFile, I.ImgOut, &jpeg.Options{Quality: 90})
case ".png":
err = png.Encode(imgFile, I.ImgOut)
default:
fmt.Println(I.ext)
return
}
if err != nil {
return
}
return
}
func NewFreeType(font_path string, size_font float64, clr color.Color) (c *freetype.Context, err error) {
// c.SetDPI(2048)
fontBytes, err := ioutil.ReadFile(font_path)
if err != nil {
return
}
fontFam, err := freetype.ParseFont(fontBytes)
if err != nil {
return
}
c = freetype.NewContext()
c.SetFont(fontFam)
c.SetFontSize(size_font)
// 设置文字颜色、字体、字大小
c.SetSrc(image.NewUniform(clr))
c.SetHinting(font.HintingNone)
return
}
func NewFont(font_path string) (font *truetype.Font, err error) {
fontFile, err := ioutil.ReadFile(font_path)
if err != nil {
return
}
font, err = truetype.Parse(fontFile)
return
}
func (I *Img) DrawText(fontType *truetype.Font, size_font float64, clr color.Color, text string, x, y float32) (err error) {
if I.ImgOut == nil {
err = errors.New("DrawText ImgOut 不能为空")
return
}
// fmt.Println("DX:", I.ImgOut.Bounds().Dx())
// fmt.Println("SizeFont:", size_font)
c := freetype.NewContext()
c.SetFont(fontType)
c.SetFontSize(size_font)
c.SetSrc(image.NewUniform(clr))
c.SetDPI(float64(I.ImgOut.Bounds().Dx()))
c.SetClip(I.ImgOut.Bounds())
c.SetDst(I.ImgOut)
c.SetHinting(font.HintingNone)
pt := freetype.Pt(I.ImgOut.Bounds().Dx()*int(x*10)/1000, I.ImgOut.Bounds().Dy()*int(y*10)/1000)
// fmt.Printf("%d %d\r\n", I.ImgOut.Bounds().Dx(), I.ImgOut.Bounds().Dy())
// fmt.Printf("%+v\r\n", pt)
_, err = c.DrawString(text, pt)
// fmt.Println(strings.Repeat("+", 10))
return
}
func PathExists(path string) bool {
_, err := os.Stat(path)
if err == nil {
return true
}
if os.IsNotExist(err) {
return false
}
return false
}
func Create() {
img, err := NewImage("tpl_ticket.png")
// img, err := NewImage("tpl.jpg")
if err != nil {
return
}
// err = img.DrawImageFile("9637.jpg", 23, 69.5, 81.8)
// if err != nil {
// return
// }
fontType, _ := NewFont("YaHeiBold.ttf")
err = img.DrawText(fontType, 4.5, color.White, "这测试", 25, 66.5)
if err != nil {
return
}
err = img.DrawText(fontType, 3.0, color.White, "这是一个测试", 23, 71)
if err != nil {
return
}
err = img.DrawText(fontType, 4.5, color.White, "这是一个测试", 23, 76)
if err != nil {
return
}
err = img.DrawText(fontType, 0.9, color.White, "生成时间:"+time.Now().Format("2006-01-02 15:04:05"), 75, 99)
if err != nil {
return
}
err = img.OutImage("out.png")
// err = img.OutImage("out.jpg")
if err != nil {
return
}
}