/*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
}