package main
import (
"flag"
"image"
"image/draw"
"image/jpeg"
"io/ioutil"
"log"
"os"
"github.com/golang/freetype"
"golang.org/x/image/font"
)
var (
dpi = flag.Float64("dpi", 72, "screen resolution in Dots Per Inch")
fontfile = flag.String("fontfile", "luxisr.ttf", "filename of the ttf font")
hinting = flag.String("hinting", "none", "none | full")
size = flag.Float64("size", 12, "font size in points")
spacing = flag.Float64("spacing", 1.5, "line spacing (e.g. 2 means double spaced)")
wonb = flag.Bool("whiteonblack", false, "white text on a black background")
)
var text = []string{
"33333333333333333",
}
func main() {
flag.Parse()
//读取字体
fontBytes, err := ioutil.ReadFile(*fontfile)
if err != nil {
log.Println(err)
return
}
//解析字体
f, err := freetype.ParseFont(fontBytes)
if err != nil {
log.Println(err)
return
}
// 初始化图片背景
fg := image.Black
if *wonb {
fg = image.White
}
//初始化一张图片,生成原图
imgB, _ := os.Open("a.jpg")
img, _ := jpeg.Decode(imgB)
defer imgB.Close()
b := img.Bounds()
rgba := image.NewNRGBA(b)
draw.Draw(rgba, rgba.Bounds(), img, image.ZP, draw.Src)
//在图片上面添加文字
c := freetype.NewContext()
c.SetDPI(*dpi)
//设置字体
c.SetFont(f)
//设置大小
c.SetFontSize(*size)
//设置边界
c.SetClip(rgba.Bounds())
//设置背景底图
c.SetDst(rgba)
//设置背景图
c.SetSrc(fg)
//设置提示
switch *hinting {
default:
c.SetHinting(font.HintingNone)
case "full":
c.SetHinting(font.HintingFull)
}
// 画文字
pt := freetype.Pt(10, 10+int(c.PointToFixed(*size)>>6))
for _, s := range text {
_, err = c.DrawString(s, pt)
if err != nil {
log.Println(err)
return
}
pt.Y += c.PointToFixed(*size * *spacing)
}
imgw, _ := os.Create("out.jpg")
jpeg.Encode(imgw, rgba, &jpeg.Options{100})
defer imgw.Close()
}
