go 绘制图片和文字

素材

132.jpg

  

 

 

 a.jpg

 代码

package main

import (
	"embed"
	"fmt"
	"github.com/golang/freetype"
	"github.com/nfnt/resize"
	"image"
	"image/color"
	"image/draw"
	"image/jpeg"
	"image/png"
	"io/ioutil"
	"math"
	"os"
	"time"
)

//go:embed a.jpg 132.jpg
var fs embed.FS

func main() {
	now := time.Now()
	err := poster()
	since := time.Since(now)
	fmt.Println(since, err)
}

func poster() error {
	back, err := fs.Open("a.jpg")
	if err != nil {
		return err
	}
	code, err := fs.Open("132.jpg")
	if err != nil {
		return err
	}
	badec, err := jpeg.Decode(back)
	if err != nil {
		return err
	}
	codec, err := jpeg.Decode(code)
	if err != nil {
		return err
	}
	ri := resize.Resize(55, 0, codec, resize.Lanczos3)
	ri = NewCircle(ri, 26)
	rgba := image.NewRGBA(badec.Bounds())
	draw.Draw(rgba, rgba.Bounds(), badec, image.Point{
		X: 0,
		Y: 0,
	}, draw.Src)
	draw.Draw(rgba, rgba.Bounds(), ri, image.Point{
		X: -389,
		Y: -10,
	}, draw.Over)
	err = drawText(rgba, "水ni23好ཀᮨ້໌ꦿꦸ钟᭄", 470, 40)
	if err != nil {
		return err
	}
	create, err := os.Create("new.png")
	if err != nil {
		return err
	}
	err = png.Encode(create, rgba)
	return err
}

func drawText(dst draw.Image, s string, x, y int) error {
	file, err := ioutil.ReadFile("C:/Windows/Fonts/MSYHL.TTC")
	if err != nil {
		return err
	}
	font, err := freetype.ParseFont(file)
	if err != nil {
		return err
	}
	con := freetype.NewContext()
	con.SetFont(font)
	con.SetFontSize(18)
	con.SetDst(dst)
	con.SetSrc(image.White)
	con.SetClip(dst.Bounds())
	_, err = con.DrawString(s, freetype.Pt(x, y))
	return err
}

type Circle struct {
	src    image.Image
	r      float64
	center image.Point
}

func NewCircle(src image.Image, r float64) *Circle {
	c := &Circle{src: src, r: r}
	min := src.Bounds().Min
	max := src.Bounds().Max
	x := min.X + (max.X-min.X)/2
	y := min.Y + (max.Y-min.Y)/2
	c.center = image.Point{
		X: x,
		Y: y,
	}
	return c
}

func (c *Circle) ColorModel() color.Model {
	return c.src.ColorModel()
}

func (c *Circle) Bounds() image.Rectangle {
	return c.src.Bounds()
}

func (c *Circle) At(x, y int) color.Color {
	i := x - c.center.X
	j := y - c.center.Y
	p1 := math.Pow(float64(i), 2)
	p2 := math.Pow(float64(j), 2)
	sqrt := math.Sqrt(p1 + p2)
	if sqrt <= c.r {
		return c.src.At(x, y)
	}
	return color.Transparent
}

 效果

 

 

标签：src,return,nil,err,image,Bounds,go,绘制,图片
来源： https://blog.csdn.net/takujo/article/details/119026393