/
drawImage.go
73 lines (58 loc) · 1.24 KB
/
drawImage.go
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package main
import (
"fmt"
"github.com/golang/freetype"
"image"
//"image/color"
"image/draw"
"image/png"
"io/ioutil"
"os"
"strings"
)
type Signer struct {
fontPath string
fontSize float64
dpi float64
}
func (this *Signer) drawStringImage(text string) (image.Image, error) {
fontBytes, err := ioutil.ReadFile(this.fontPath)
if err != nil {
fmt.Println(err)
}
font, err := freetype.ParseFont(fontBytes)
if err != nil {
fmt.Println(err)
}
rgba := image.NewRGBA(image.Rect(0, 0, 900, 900))
draw.Draw(rgba, rgba.Bounds(), image.Black, image.ZP, draw.Src)
c := freetype.NewContext()
c.SetDPI(this.dpi)
c.SetFontSize(this.fontSize)
c.SetClip(rgba.Bounds())
c.SetDst(rgba)
c.SetSrc(image.White)
c.SetFont(font)
pt := freetype.Pt(100, 100+int(c.PointToFixed(this.fontSize)>>8))
for _, s := range strings.Split(text, "\r\n") {
_, err = c.DrawString(s, pt)
pt.Y += c.PointToFixed(12 * 1.5)
}
return rgba, nil
}
func main() {
text := "测试"
s := Signer{}
s.dpi = 80
s.fontSize = 30
s.fontPath = "/Users/baike/Downloads/kaishu.ttf"
img, err := s.drawStringImage(text)
if err != nil {
fmt.Println(err)
}
file, _ := os.Create("test.png")
err = png.Encode(file, img)
if err != nil {
fmt.Println(err)
}
}