/*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 }
// 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 }