tools/util/image/back.txt

func (p *Poster) Create2(json PosterJson) (string, error) {
	cachePath := fmt.Sprintf("%s/cache", util.Getwd())
	image := NewImage(util.Getwd())
	image.SetCache(cachePath)
	if json.Use == "bgUrl" {
		json.Background = ""
	}
	if json.Use == "bgc" {
		json.BackgroundUrl = ""
	}
	poster, err := image.Create(json.BackgroundUrl, json.Background, *NewSize(json.Width, json.Height))

	if err != nil {
		return "", err
	}
	defer poster.Destroy()

	itemLen := len(json.Items)
	destChan := make(chan *PosterMW, itemLen)

	defer close(destChan)

	for index, item := range json.Items {
		go func(item Items, index int) {
			var drawErr error
			var drawMW *gmagick.MagickWand
			var updated Items
			if item.Type == "text" {
				drawMW, updated, drawErr = p.Text(item)
			}
			if item.Type == "image" {
				drawMW, drawErr = image.Resize(item.Value, item.Width, item.Height, item.Angle)
			}
			if item.Type == "qrcode" {
				drawMW, updated, drawErr = p.QRCode(item)
			}
			destChan <- &PosterMW{Index: index, Image: drawMW, Item: updated, Err: drawErr}
		}(item, index)
	}

	var response = make([]*PosterMW, itemLen)
	for i := 0; i < len(json.Items); i++ {
		res := <-destChan
		response[res.Index] = res
	}
	for i := 0; i < len(response); i++ {
		draw := response[i].Image
		errDraw := response[i].Err
		if errDraw != nil {
			continue
		}
		if errComposite := poster.CompositeImage(draw, gmagick.COMPOSITE_OP_OVER, response[i].Item.X, response[i].Item.Y); errComposite != nil {
			fmt.Println("poster.CompositeImage text err : ", errComposite.Error())
			continue
		}
	}

	destFile := image.CacheFile("preview-poster", poster.GetImageFormat())
	err = poster.WriteImage(destFile)

	if err != nil {
		return "", err
	}
	return destFile, nil
}

func (p *Poster) Create1(json PosterJson) (string, error) {
	cachePath := fmt.Sprintf("%s/cache", util.Getwd())
	image := NewImage(util.Getwd())
	image.SetCache(cachePath)
	if json.Use == "bgUrl" {
		json.Background = ""
	}
	if json.Use == "bgc" {
		json.BackgroundUrl = ""
	}
	poster, err := image.Create(json.BackgroundUrl, json.Background, *NewSize(json.Width, json.Height))

	if err != nil {
		return "", err
	}
	defer poster.Destroy()

	for _, item := range json.Items {

		if item.Type == "text" {
			drawText, _, errTxt := p.Text(item)
			if errTxt != nil {
				fmt.Println("drawText err: ", errTxt.Error())
				continue
			}
			if errComposite := poster.CompositeImage(drawText, gmagick.COMPOSITE_OP_OVER, item.X, item.Y); errComposite != nil {
				fmt.Println("poster.CompositeImage text err : ", errComposite.Error())
				continue
			}
		}

		if item.Type == "image" {
			imageMW, errImage := image.Resize(item.Value, item.Width, item.Height, item.Angle)
			if errImage != nil {
				continue
			}
			if errComposite := poster.CompositeImage(imageMW, gmagick.COMPOSITE_OP_OVER, item.X, item.Y); errComposite != nil {
				fmt.Println("poster.CompositeImage image err : ", errComposite.Error())
				continue
			}
		}

		if item.Type == "qrcode" {
			qrWM, _, errQr := p.QRCode(item)
			if errQr != nil {
				fmt.Println("Qr err", errQr.Error())
				continue
			}
			if errComposite := poster.CompositeImage(qrWM, gmagick.COMPOSITE_OP_OVER, item.X, item.Y); errComposite != nil {
				fmt.Println("poster.CompositeImage qr err : ", errComposite.Error())
				continue
			}
		}
	}

	//util.RandomStr(10);
	destFile := image.CacheFile("preview-poster", poster.GetImageFormat())
	err = poster.WriteImage(destFile)

	if err != nil {
		return "", err
	}
	return destFile, nil
}