Golang imagick.NewMagickWand函數代碼示例

func main() {
	imagick.Initialize()
	defer imagick.Terminate()

	mw := imagick.NewMagickWand()
	defer mw.Destroy()
	lw := imagick.NewMagickWand()
	defer lw.Destroy()
	pw := imagick.NewPixelWand()
	defer pw.Destroy()
	dw := imagick.NewDrawingWand()
	defer dw.Destroy()

	// Create the initial 640x480 transparent canvas
	pw.SetColor("none")
	mw.NewImage(640, 480, pw)

	pw.SetColor("white")
	dw.SetFillColor(pw)
	dw.RoundRectangle(15, 15, 624, 464, 15, 15)
	mw.DrawImage(dw)

	lw.ReadImage("logo:")
	// Note that MagickSetImageCompose is usually only used for the MagickMontageImage
	// function and isn't used or needed by MagickCompositeImage
	mw.CompositeImage(lw, imagick.COMPOSITE_OP_SRC_IN, 0, 0)

	/* Write the new image */
	mw.WriteImage("mask_result.png")
}

func (this *JmaImageGenerator) GenerateImage(date string, digest string) string {
	mapImage := image.ReadImageFromAsset("data/jma_map.png")
	defer mapImage.Destroy()
	maskImage := image.ReadImageFromAsset("data/jma_mask.png")
	defer maskImage.Destroy()
	manucipalityImage := image.ReadImageFromAsset("data/jma_manucipality.png")
	defer manucipalityImage.Destroy()
	ihrImage := image.ReadImageFromAsset("data/ihr.png")
	defer ihrImage.Destroy()

	rainImage := imagick.NewMagickWand()
	defer rainImage.Destroy()
	for w := MIN_WIDTH; w <= MAX_WIDTH; w++ {
		tmpImage := imagick.NewMagickWand()
		defer tmpImage.Destroy()
		for h := MIN_HEIGHT; h <= MAX_HEIGHT; h++ {
			tmp := image.GetImageFromUrl("http://www.jma.go.jp/jp/highresorad/highresorad_tile/HRKSNC/" + date + "/" + date + "/zoom6/" + strconv.Itoa(w) + "_" + strconv.Itoa(h) + ".png")
			defer tmp.Destroy()
			tmpImage.AddImage(tmp)
			tmpImage.SetLastIterator()
		}
		tmpImage.SetFirstIterator()
		tmpImage = tmpImage.AppendImages(true)
		rainImage.AddImage(tmpImage)
		rainImage.SetLastIterator()
	}
	rainImage.SetFirstIterator()
	rainImage = rainImage.AppendImages(false)
	rainImage.AdaptiveResizeImage(2048, 2048)

	err := mapImage.CompositeImage(rainImage, imagick.COMPOSITE_OP_OVER, 0, 0)
	if err != nil {
		log.Println(err)
	}
	err = mapImage.CompositeImage(maskImage, imagick.COMPOSITE_OP_OVER, 0, 0)
	if err != nil {
		log.Println(err)
	}
	err = mapImage.CompositeImage(manucipalityImage, imagick.COMPOSITE_OP_OVER, 0, 0)
	if err != nil {
		log.Println(err)
	}
	err = mapImage.CropImage(1000, 500, 580, 750)
	if err != nil {
		log.Println(err)
	}
	err = mapImage.CompositeImage(ihrImage, imagick.COMPOSITE_OP_OVER, 750, 300)
	if err != nil {
		log.Println(err)
	}

	url, err := image.Upload(digest+".png", mapImage.GetImageBlob())
	if err != nil {
		fmt.Println(err)
	}
	return url
}

func main() {
	imagick.Initialize()
	defer imagick.Terminate()

	mw := imagick.NewMagickWand()
	defer mw.Destroy()
	aw := imagick.NewMagickWand()
	defer aw.Destroy()

	// Read the first input image
	if err := mw.ReadImage("bunny_grass.gif"); err != nil {
		panic(err)
	}

	// We need a separate wand to do this bit in parentheses
	if err := aw.ReadImage("bunny_anim.gif"); err != nil {
		panic(err)
	}
	aw.ResetImagePage("0x0+5+15!")

	// Now we have to add the images in the aw wand on to the end
	// of the mw wand.
	mw.AddImage(aw)
	// We can now destroy the aw wand so that it can be used
	// for the next operation
	aw.Destroy()
	// -coalesce
	aw = mw.CoalesceImages()

	// do "-delete 0" by copying the images from the "aw" wand to
	// the "mw" wand but omit the first one
	// free up the mw wand and recreate it for this step
	mw.Destroy()
	mw = imagick.NewMagickWand()

	for i := 1; i < int(aw.GetNumberImages()); i++ {
		aw.SetIteratorIndex(i)
		tw := aw.GetImage()
		mw.AddImage(tw)
		tw.Destroy()
	}
	mw.ResetIterator()
	aw.Destroy()

	// -deconstruct
	// Anthony says that MagickDeconstructImages is equivalent
	// to MagickCompareImagesLayers so we'll use that
	aw = mw.CompareImageLayers(imagick.IMAGE_LAYER_COMPARE_ANY)
	// -loop 0
	aw.SetOption("loop", "0")

	// write the images into one file
	if err := aw.WriteImages("bunny_bgnd.gif", true); err != nil {
		panic(err)
	}
}

// Actually placed screenshot onto background image
func placeit(image_id string, xml_data Result, image []byte) string {
	imagick.Initialize()
	defer imagick.Terminate()

	width, _ := strconv.Atoi(xml_data.Device.Resolution.Width)
	height, _ := strconv.Atoi(xml_data.Device.Resolution.Height)

	x_positions := make([]int, 4)
	x_positions[0], _ = strconv.Atoi(xml_data.Device.Placement.Top_left_x)
	x_positions[1], _ = strconv.Atoi(xml_data.Device.Placement.Top_right_x)
	x_positions[2], _ = strconv.Atoi(xml_data.Device.Placement.Bottom_right_x)
	x_positions[3], _ = strconv.Atoi(xml_data.Device.Placement.Bottom_left_x)

	y_positions := make([]int, 4)
	y_positions[0], _ = strconv.Atoi(xml_data.Device.Placement.Top_left_y)
	y_positions[1], _ = strconv.Atoi(xml_data.Device.Placement.Top_right_y)
	y_positions[2], _ = strconv.Atoi(xml_data.Device.Placement.Bottom_right_y)
	y_positions[3], _ = strconv.Atoi(xml_data.Device.Placement.Bottom_left_y)

	base_x := x_positions[0]
	base_y := y_positions[0]

	result := []float64{0, 0,
		float64(x_positions[0] - base_x), float64(y_positions[0] - base_y),
		float64(width), 0,
		float64(x_positions[1] - base_x), float64(y_positions[1] - base_y),
		float64(width), float64(height),
		float64(x_positions[2] - base_x), float64(y_positions[2] - base_y),
		0, float64(height),
		float64(x_positions[3] - base_x), float64(y_positions[3] - base_y)}

	mw := imagick.NewMagickWand()
	defer mw.Destroy()
	back_mw := imagick.NewMagickWand()
	defer back_mw.Destroy()

	mw.ReadImageBlob(image)
	back_mw.ReadImage("src/github.com/JustinJudd/go_snappshot/public/images/backgrounds/" + image_id + ".jpg")

	mw.SetImageVirtualPixelMethod(imagick.VIRTUAL_PIXEL_TRANSPARENT)
	mw.DistortImage(imagick.DISTORTION_PERSPECTIVE, result, true)

	sort.IntSlice.Sort(x_positions)
	sort.IntSlice.Sort(y_positions)
	back_mw.CompositeImage(mw, imagick.COMPOSITE_OP_OVER, x_positions[0], y_positions[0])
	placed_id := strconv.Itoa(int(time.Now().UnixNano()))
	back_mw.WriteImage(getGeneratedPath(placed_id))

	return placed_id

}

// Text effect 1 - shadow effect using MagickShadowImage
// NOTE - if an image has a transparent background, adding a border of any colour other
// than "none" will remove all the transparency and replace it with the border's colour
func textEffect1() {
	imagick.Initialize()
	defer imagick.Terminate()
	mw := imagick.NewMagickWand()
	defer mw.Destroy()
	dw := imagick.NewDrawingWand()
	defer dw.Destroy()
	pw := imagick.NewPixelWand()
	defer pw.Destroy()
	pw.SetColor("none")
	// Create a new transparent image
	mw.NewImage(350, 100, pw)
	// Set up a 72 point white font
	pw.SetColor("white")
	dw.SetFillColor(pw)
	dw.SetFont("Verdana-Bold-Italic")
	dw.SetFontSize(72)
	// Add a black outline to the text
	pw.SetColor("black")
	dw.SetStrokeColor(pw)
	// Turn antialias on - not sure this makes a difference
	dw.SetTextAntialias(true)
	// Now draw the text
	dw.Annotation(25, 65, "Magick")
	// Draw the image on to the mw
	mw.DrawImage(dw)
	// Trim the image down to include only the text
	mw.TrimImage(0)
	// equivalent to the command line +repage
	mw.ResetImagePage("")
	// Make a copy of the text image
	cw := mw.Clone()
	// Set the background colour to blue for the shadow
	pw.SetColor("blue")
	mw.SetImageBackgroundColor(pw)
	// Opacity is a real number indicating (apparently) percentage
	mw.ShadowImage(70, 4, 5, 5)
	// Composite the text on top of the shadow
	mw.CompositeImage(cw, imagick.COMPOSITE_OP_OVER, 5, 5)
	cw.Destroy()
	cw = imagick.NewMagickWand()
	defer cw.Destroy()
	// Create a new image the same size as the text image and put a solid colour
	// as its background
	pw.SetColor("rgb(125,215,255)")
	cw.NewImage(mw.GetImageWidth(), mw.GetImageHeight(), pw)
	// Now composite the shadowed text over the plain background
	cw.CompositeImage(mw, imagick.COMPOSITE_OP_OVER, 0, 0)
	// and write the result
	cw.WriteImage("text_shadow.png")
}

// Text effect 3 -  arc font (similar to http://www.imagemagick.org/Usage/fonts/#arc)
func textEffect3() {
	imagick.Initialize()
	defer imagick.Terminate()
	mw := imagick.NewMagickWand()
	defer mw.Destroy()
	dw := imagick.NewDrawingWand()
	defer dw.Destroy()
	pw := imagick.NewPixelWand()
	defer pw.Destroy()
	// Create a 320x100 lightblue canvas
	pw.SetColor("lightblue")
	mw.NewImage(320, 100, pw)
	// Set up a 72 point font
	dw.SetFont("Verdana-Bold-Italic")
	dw.SetFontSize(72)
	// Now draw the text
	dw.Annotation(25, 65, "Magick")
	// Draw the image on to the mw
	mw.DrawImage(dw)
	mw.DistortImage(imagick.DISTORTION_ARC, dargs, false)
	// Trim the image
	mw.TrimImage(0)
	// Add the border
	pw.SetColor("lightblue")
	mw.BorderImage(pw, 10, 10)
	// and write it
	mw.WriteImage("text_arc.png")
}

func (ng Engine) GetImageInfo(b []byte, srcFormat ...string) (*imgry.ImageInfo, error) {
	if len(b) == 0 {
		return nil, imgry.ErrInvalidImageData
	}

	mw := imagick.NewMagickWand()
	defer mw.Destroy()

	if !mw.IsVerified() {
		return nil, ErrEngineFailure
	}

	err := mw.PingImageBlob(b)
	if err != nil {
		return nil, imgry.ErrInvalidImageData
	}

	w, h := int(mw.GetImageWidth()), int(mw.GetImageHeight())
	ar := float64(int(float64(w)/float64(h)*10000)) / 10000

	format := strings.ToLower(mw.GetImageFormat())
	if format == "jpeg" {
		format = "jpg"
	}

	imfo := &imgry.ImageInfo{
		Format: format, Width: w, Height: h,
		AspectRatio: ar, ContentLength: len(b),
	}

	return imfo, nil
}

func (ng Engine) LoadBlob(b []byte, srcFormat ...string) (imgry.Image, error) {
	if len(b) == 0 {
		return nil, imgry.ErrInvalidImageData
	}

	mw := imagick.NewMagickWand()
	if !mw.IsVerified() {
		return nil, ErrEngineFailure
	}

	// Offer a hint to the decoder of the file format
	if len(srcFormat) > 0 {
		f := srcFormat[0]
		if f != "" {
			mw.SetFormat(f)
		}
	}

	err := mw.ReadImageBlob(b)
	if err != nil {
		mw.Destroy()
		return nil, imgry.ErrInvalidImageData
	}

	// TODO: perhaps we pass the engine instance like Image{engine: i}
	im := &Image{mw: mw, data: b}
	if err := im.sync(); err != nil {
		mw.Destroy()
		return nil, err
	}

	return im, nil
}

// Example 2
// Rotate logo: 30 degrees around the point (300,100)
// Since rotation is done around the origin, we must translate
// the point (300,100) up to the origin, do the rotation, and
// then translate back again
//
func example2() {
	imagick.Initialize()
	defer imagick.Terminate()

	t1 := make([]float64, 6)
	r := make([]float64, 6)
	t2 := make([]float64, 6)
	temp := make([]float64, 6)
	result := make([]float64, 6)

	mw := imagick.NewMagickWand()
	defer mw.Destroy()

	mw.ReadImage("logo:")

	// Initialize the required affines
	// translate (300,100) to origin
	set_translate_affine(t1, -300, -100)
	// rotate clockwise by 30 degrees
	set_rotate_affine(r, 30)
	// translate back again
	set_translate_affine(t2, 300, 100)

	// Now multiply the affine sequence
	// temp = t1*r
	affine_multiply(temp, t1, r)
	// result = temp*t2
	affine_multiply(result, temp, t2)

	mw.DistortImage(imagick.DISTORTION_AFFINE_PROJECTION, result, false)
	mw.WriteImage("logo_affine_2.jpg")
}

func getTextImage(text string, size int) []byte {
	imagick.Initialize()
	defer imagick.Terminate()
	mw := imagick.NewMagickWand()
	defer mw.Destroy()
	dw := imagick.NewDrawingWand()
	defer dw.Destroy()
	pw := imagick.NewPixelWand()
	defer pw.Destroy()
	l := len(text)
	w := size * 3 * (l + 6)
	h := size * 2
	pw.SetColor("none")
	mw.NewImage(uint(w), uint(h), pw)
	pw.SetColor("white")
	dw.SetFillColor(pw)
	dw.SetFont("/usr/share/fonts/default/TrueType/msyh.ttf")
	dw.SetFontSize(float64(size))
	dw.Annotation(0, float64(size), "ctrip © "+text)
	mw.DrawImage(dw)
	mw.TrimImage(0)

	mw.ResetImagePage("")
	cw := mw.Clone()
	pw.SetColor("black")
	mw.SetImageBackgroundColor(pw)
	mw.ShadowImage(100, 1, 0, 0)
	mw.CompositeImage(cw, imagick.COMPOSITE_OP_OVER, 1, 1)
	cw.Destroy()

	mw.SetImageFormat("PNG")
	return mw.GetImageBlob()
}

func (c Snappshot) Screenshot(res string) revel.Result {
	s := strings.Split(res, "x")
	width, _ := strconv.Atoi(s[0])
	height, _ := strconv.Atoi(s[1])
	imagick.Initialize()
	defer imagick.Terminate()

	mw := imagick.NewMagickWand()
	defer mw.Destroy()
	dw := imagick.NewDrawingWand()
	defer dw.Destroy()
	cw := imagick.NewPixelWand()
	cw2 := imagick.NewPixelWand()

	cw.SetColor("darkgray")
	cw2.SetColor("white")
	mw.NewImage(uint(width), uint(height), cw)

	dw.SetTextAlignment(imagick.ALIGN_CENTER)
	dw.SetFillColor(cw2)
	dw.SetFontSize(150)
	cw2.SetColor("black")
	dw.SetStrokeColor(cw2)
	dw.Annotation(float64(width)/2, float64(height)/2, res)

	mw.DrawImage(dw)
	mw.SetImageFormat("jpg")
	output := mw.GetImageBlob()
	return JPGImage(output)
}

// Text effect 4 - bevelled font http://www.imagemagick.org/Usage/fonts/#bevel
func textEffect4() {
	imagick.Initialize()
	defer imagick.Terminate()
	mw := imagick.NewMagickWand()
	defer mw.Destroy()
	dw := imagick.NewDrawingWand()
	defer dw.Destroy()
	pw := imagick.NewPixelWand()
	defer pw.Destroy()
	// Create a 320x100 canvas
	pw.SetColor("gray")
	mw.NewImage(320, 100, pw)
	// Set up a 72 point font
	dw.SetFont("Verdana-Bold-Italic")
	dw.SetFontSize(72)
	// Set up a 72 point white font
	pw.SetColor("white")
	dw.SetFillColor(pw)
	// Now draw the text
	dw.Annotation(25, 65, "Magick")
	// Draw the image on to the mw
	mw.DrawImage(dw)
	// the "gray" parameter must be true to get the effect shown on Anthony's page
	mw.ShadeImage(true, 140, 60)
	pw.SetColor("yellow")
	dw.SetFillColor(pw)
	cpw := imagick.NewPixelWand()
	defer cpw.Destroy()
	cpw.SetColor("gold")
	mw.ColorizeImage(pw, cpw)
	// and write it
	mw.WriteImage("text_bevel.png")
}

func imageFromUrl(w http.ResponseWriter, r *http.Request) (*imagick.MagickWand, error) {
	queryUrl := r.URL.Query().Get("url")
	url, _ := url.QueryUnescape(queryUrl)
	resp, err := http.Get(url)
	if err != nil {
		return nil, err
	}
	data, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		http.Error(w, "Error retrieving url", 500)
		return nil, err
	}
	wand := imagick.NewMagickWand()
	err = wand.ReadImageBlob(data)
	if err != nil {
		http.Error(w, "Error retrieving url", 500)
		return nil, err
	}
	if err = wand.SetImageFormat("JPG"); err != nil {
		http.Error(w, "Error retrieving url", 500)
		return nil, err
	}
	wand.AutoLevelImage()
	return wand, nil
}

func main() {
	// Note that the colours are stored as separate *normalized* RGB components
	arglist := []float64{
		0, 0,
		// RGB black
		0, 0, 0,
		// The y coordinate is filled in later
		0, -1,
		// RGB white
		1, 1, 1,
	}
	// arguments for MagickFunctionImage
	funclist := []float64{4, -4, 1}
	imagick.Initialize()
	defer imagick.Terminate()
	mw := imagick.NewMagickWand()
	defer mw.Destroy()
	mw.ReadImage("beijing_md.jpg")
	// fill in the Y coordinate now that we can get the image dimensions
	arglist[6] = float64(mw.GetImageHeight() - 1)
	mw.SigmoidalContrastImage(true, 15, imagick.QUANTUM_RANGE*30/100)
	cw := mw.Clone()
	defer cw.Destroy()
	cw.SparseColorImage(imagick.CHANNELS_RGB, imagick.INTERPOLATE_BARYCENTRIC_COLOR, arglist)
	// Do the polynomial function
	cw.FunctionImage(imagick.FUNCTION_POLYNOMIAL, funclist)
	// -set option:compose:args 15
	if err := cw.SetImageArtifact("compose:args", "15"); err != nil {
		panic(err)
	}
	mw.CompositeImage(cw, imagick.COMPOSITE_OP_BLUR, 0, 0)
	mw.WriteImage("beijing_model.jpg")
}

func glitchImage(wand *imagick.MagickWand, q url.Values) ([]byte, error) {
	data := wand.GetImage().GetImageBlob()
	jpgHeaderLength := getJpegHeaderSize(data)
	maxIndex := len(data) - jpgHeaderLength - 4
	params := getParams(q)
	length := int(params["iterations"])
	for i := 0; i < length; i++ {
		pxMin := math.Floor(float64(maxIndex) / params["iterations"] * float64(i))
		pxMax := math.Floor(float64(maxIndex) / params["iterations"] * float64((i + 1)))
		delta := pxMax - pxMin
		pxI := math.Floor(pxMin + delta*params["seed"])
		if int(pxI) > maxIndex {
			pxI = float64(maxIndex)
		}
		index := math.Floor(float64(jpgHeaderLength) + pxI)
		data[int(index)] = byte(math.Floor(params["amount"] * float64(256)))
	}
	wand2 := imagick.NewMagickWand()
	if err := wand2.ReadImageBlob(data); err != nil {
		return nil, err
	}
	if err := wand2.SetImageFormat("PNG"); err != nil {
		return nil, err
	}
	return wand2.GetImage().GetImageBlob(), nil
}