Exemple #1
0
/*resizeImage() mw fullsize image
newwidth, newheight = size to be resized to
keepSpecSize = return image with exactly the size specified or just the size of the resized image
center = senter the image
*/
func resizeImage(mw *imagick.MagickWand, newWidth, newHeight int, keepSpecSize, center bool) (resmw *imagick.MagickWand) {
	var (
		width, height, origHeight, origWidth int
	)
	origHeight = int(mw.GetImageHeight())
	origWidth = int(mw.GetImageWidth())

	//check if requested size is the same as current size
	if (origHeight != newHeight) || (origWidth != newWidth) {
		// width / height * newheight = newwidth
		if (round((float64(origWidth) / float64(origHeight)) * float64(newHeight))) <= newWidth {
			width = round((float64(origWidth) / float64(origHeight)) * float64(newHeight))
			height = newHeight
		} else {
			// height / width * newwidth = newheight
			height = round((float64(origHeight) / float64(origWidth)) * float64(newWidth))
			width = newWidth
		}
	} else {
		height = newHeight
		width = newWidth
	}

	//new magickwand for resized image
	resmw = imagick.NewMagickWand()

	if !keepSpecSize {
		resmw.NewImage(uint(width), uint(height), imagick.NewPixelWand())
		center = false
	} else {
		//blank image
		resmw.NewImage(uint(newWidth), uint(newHeight), imagick.NewPixelWand())
		if center {
			err = mw.ResizeImage(uint(width), uint(height), imagick.FILTER_LANCZOS, 1)
			if err != nil {
				panic(err)
			}
			//centers image
			resmw.CompositeImage(mw, imagick.COMPOSITE_OP_SRC_OVER, round(float64(newWidth-width)/float64(2)), round(float64(newHeight-height)/float64(2)))
		} else {
			resmw.CompositeImage(mw, imagick.COMPOSITE_OP_SRC_OVER, 0, 0)
		}
	}
	mw.Destroy()
	return resmw

}
Exemple #2
0
// adding text to image copied from example
func (cl *cell) imgtext(width, height int) *imagick.MagickWand {
	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(uint(width), uint(height), pw)

	// Set up a 72 point white font
	r, g, b, _ := cl.font.color.RGBA()
	pw.SetColor(fmt.Sprintf("rgb(%d,%d,%d)", r, g, b))
	dw.SetFillColor(pw)
	if (cl.font.name != "") || (cl.font.name != "none") {
		dw.SetFont(cl.font.name)
	}
	dw.SetFontSize(cl.font.size)

	otlne := "none"
	// Add a black outline to the text
	r, g, b, _ = cl.font.outlineColor.RGBA()
	if cl.font.outline {
		otlne = fmt.Sprintf("rgb(%d,%d,%d)", r, g, b)
	}

	pw.SetColor(otlne)
	dw.SetStrokeColor(pw)
	dw.SetStrokeWidth(cl.font.outlineSize)

	// Turn antialias on - not sure this makes a difference
	//dw.SetTextAntialias(true)

	// Now draw the text
	dw.Annotation(cl.font.x, cl.font.y, cl.text)

	// Draw the image on to the mw
	mw.DrawImage(dw)

	// 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("black")
	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()
	return mw
}