go操作img

---

前言

批量处理图片,先按短边缩放然后居中剪裁,

---

一、代码

package main

import (
	"bufio"
	"github.com/go-toast/toast"
	"github.com/nfnt/resize"
	"image"
	_ "image/gif"
	"image/jpeg"
	_ "image/jpeg"
	_ "image/png"
	"io"
	"io/ioutil"
	"log"
	"os"
	"path/filepath"
	"strconv"
	"strings"
)

func main() {
	path, _ := os.Getwd()
	fileInfos, err := ioutil.ReadDir(path)
	if err != nil {
		return
	}
	getW(path)
	for _, info := range fileInfos {
		if strings.HasSuffix(info.Name(), ".jpg") {
			f := path + string(filepath.Separator) + info.Name()
			updateImg(info.Name(), f, path)
		}
	}
	notification := toast.Notification{
		AppID:   "Microsoft.Windows.Shell.RunDialog",
		Title:   "OK",
		Message: "生成结束",
	}
	err = notification.Push()
	if err != nil {
		log.Fatalln(err)
	}

}
func updateImg(name, path, p string) {
	f, err := os.Open(path)
	if err != nil {
		panic(err)
	}
	m, _, err := image.Decode(f)
	if err != nil {
		panic(err)
	}
	//先缩放
	//定义给定的 wi 和 wh  取自配置文件
	w, err := strconv.Atoi(getW(p))
	if err != nil {
		return
	}
	h, err := strconv.Atoi(getH(p))
	if err != nil {
		return
	}
	//原图片的长和宽
	wx := m.Bounds().Size().X
	hy := m.Bounds().Size().Y

	//以图片的短边缩放
	if wx > hy {
		m1 := resize.Resize(0, uint(h), m, resize.Lanczos3)
		//以h为中心锚点剪裁.如果原来的图片过长则取出图片中心上下+
		img := m1.(*image.YCbCr)
		subImg := img.SubImage(image.Rect(img.Bounds().Size().X/2-w/2, 0, img.Bounds().Size().X/2+w/2, h)).(*image.YCbCr)
		folderPath := filepath.Join(p, "NEW_IMG")
		os.Mkdir(folderPath, 0777)
		// 再修改权限
		os.Chmod(folderPath, 0777)

		folderPath1 := filepath.Join(folderPath, name)

		f, _ = os.Create(folderPath1) //创建文件
		defer f.Close()               //关闭文件
		jpeg.Encode(f, subImg, nil)   //写入文件
	} else {
		m1 := resize.Resize(uint(w), 0, m, resize.Lanczos3)
		//以h为中心锚点剪裁.如果原来的图片过长则取出图片中心上下+
		img := m1.(*image.YCbCr)
		subImg := img.SubImage(image.Rect(0, img.Bounds().Size().Y/2-h/2, w, img.Bounds().Size().Y/2+h/2)).(*image.YCbCr)
		folderPath := filepath.Join(p, "NEW_IMG")
		os.Mkdir(folderPath, 0777)
		// 再修改权限
		os.Chmod(folderPath, 0777)

		folderPath1 := filepath.Join(folderPath, name)

		f, _ = os.Create(folderPath1) //创建文件
		defer f.Close()               //关闭文件
		jpeg.Encode(f, subImg, nil)   //写入文件
	}
}

// msgInfo.txt
func getW(path string) string {
	path = path + "/msgInfo.txt"
	fileHanle, _ := os.OpenFile(path, os.O_RDONLY, 0666)
	defer fileHanle.Close()
	reader := bufio.NewReader(fileHanle)
	// 按行处理txt
	for {
		line, _, err := reader.ReadLine()
		if err == io.EOF {
			break
		}

		if strings.Contains(string(line), "W") {
			return strings.Split(string(line), ":")[1]
		}
	}
	return "100"
}
func getH(path string) string {
	path = path + "/msgInfo.txt"
	fileHanle, _ := os.OpenFile(path, os.O_RDONLY, 0666)
	defer fileHanle.Close()
	reader := bufio.NewReader(fileHanle)
	// 按行处理txt
	for {
		line, _, err := reader.ReadLine()
		if err == io.EOF {
			break
		}

		if strings.Contains(string(line), "H") {
			return strings.Split(string(line), ":")[1]
		}
	}
	return "200"
}

二、配置文件

msgInfo.txt

三、打包

打包生成图标参考 go操作excel