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 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)
}
}
// 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 2 - tiled text using the builtin checkerboard pattern
// Anthony's Tiled Font effect
func textEffect2() {
imagick.Initialize()
defer imagick.Terminate()
mw := imagick.NewMagickWand()
defer mw.Destroy()
dw := imagick.NewDrawingWand()
defer dw.Destroy()
pw := imagick.NewPixelWand()
defer pw.Destroy()
setTilePattern(dw, "#check", "pattern:checkerboard")
pw.SetColor("lightblue")
// Create a new transparent image
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(28, 68, "Magick")
// Draw the image on to the mw
mw.DrawImage(dw)
// Trim the image
mw.TrimImage(0)
// Add a transparent border
pw.SetColor("lightblue")
mw.BorderImage(pw, 5, 5)
// and write it
mw.WriteImage("text_pattern.png")
}
// The public method for processing an image. The method receives an original
// image and options and returns the processed image.
func (ip *imageProcessor) ProcessImage(image *Image, request *ImageProcessorOptions) *Image {
processedImage := Image{}
wand := imagick.NewMagickWand()
defer wand.Destroy()
wand.ReadImageBlob(image.Bytes)
err, scaleModified := ip.scaleWand(wand, request)
if err != nil {
ip.Logger.Warn("Error scaling image: %s", err)
return nil
}
err, blurModified := ip.blurWand(wand, request)
if err != nil {
ip.Logger.Warn("Error blurring image: %s", err)
return nil
}
if !scaleModified && !blurModified {
processedImage.Bytes = image.Bytes
} else {
processedImage.Bytes = wand.GetImageBlob()
}
processedImage.MimeType = fmt.Sprintf("image/%s", strings.ToLower(wand.GetImageFormat()))
return &processedImage
}
func main() {
var err error
imagick.Initialize()
defer imagick.Terminate()
mw := imagick.NewMagickWand()
defer mw.Destroy()
bg := imagick.NewPixelWand()
defer bg.Destroy()
fg := imagick.NewPixelWand()
defer fg.Destroy()
err = mw.ReadImage("http://www.imagemagick.org/Usage/images/cyclops_sm.gif")
if err != nil {
panic(err)
}
bg.SetColor("white")
mw.BorderImage(bg, 1, 1)
mw.SetImageAlphaChannel(imagick.ALPHA_CHANNEL_SET)
fg.SetColor("none")
channel := imagick.CHANNELS_RGB | imagick.CHANNEL_ALPHA
// Floodfill the "background" colour with the "foreground" colour
// starting at coordinate 0,0 using a fuzz of 20
mw.FloodfillPaintImage(channel, fg, 20, bg, 0, 0, false)
mw.ShaveImage(1, 1)
mw.DisplayImage(os.Getenv("DYSPLAY"))
if err != nil {
panic(err)
}
}
// 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")
}
// Text effect 7 - Polar distortion
func textEffect7() {
imagick.Initialize()
defer imagick.Terminate()
// This one uses d_args[0]
mw := imagick.NewMagickWand()
defer mw.Destroy()
dw := imagick.NewDrawingWand()
defer dw.Destroy()
pw := imagick.NewPixelWand()
defer pw.Destroy()
// Create a 320x200 transparent canvas
pw.SetColor("none")
mw.NewImage(320, 200, 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)
d_args[0] = 0.0
// DON'T FORGET to set the correct number of arguments here
mw.DistortImage(imagick.DISTORTION_POLAR, d_args, true)
//mw.ResetImagePage("")
// Trim the image again
mw.TrimImage(0)
// Add the border
pw.SetColor("none")
mw.BorderImage(pw, 10, 10)
// and write it
mw.WriteImage("text_polar.png")
}
// 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")
}
// 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 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")
}
// Text effect 5 and 6 - Plain text and then Barrel distortion
func textEffect5And6() {
imagick.Initialize()
defer imagick.Terminate()
// This one uses d_args
mw := imagick.NewMagickWand()
defer mw.Destroy()
dw := imagick.NewDrawingWand()
defer dw.Destroy()
pw := imagick.NewPixelWand()
defer pw.Destroy()
// Create a 320x100 transparent canvas
pw.SetColor("none")
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.WriteImage("text_plain.png")
// Trim the image
mw.TrimImage(0)
// Add the border
pw.SetColor("none")
mw.BorderImage(pw, 10, 10)
//mw.SetImageMatte(true)
//mw.SetImageVirtualPixelMethod(TransparentVirtualPixelMethod)
// d_args[0] = 0.1;d_args[1] = -0.25;d_args[2] = -0.25; [3] += .1
// The first value should be positive. If it is negative the image is *really* distorted
d_args[0] = 0.0
d_args[1] = 0.0
d_args[2] = 0.5
// d_args[3] should normally be chosen such the sum of all 4 values is 1
// so that the result is the same size as the original
// You can override the sum with a different value
// If the sum is greater than 1 the resulting image will be smaller than the original
d_args[3] = 1 - (d_args[0] + d_args[1] + d_args[2])
// Make the result image smaller so that it isn't as likely
// to overflow the edges
// d_args[3] += 0.1
// 0.0,0.0,0.5,0.5,0.0,0.0,-0.5,1.9
d_args[3] = 0.5
d_args[4] = 0.0
d_args[5] = 0.0
d_args[6] = -0.5
d_args[7] = 1.9
// DON'T FORGET to set the correct number of arguments here
mw.DistortImage(imagick.DISTORTION_BARREL, d_args, true)
//mw.ResetImagePage("")
// Trim the image again
mw.TrimImage(0)
// Add the border
pw.SetColor("none")
mw.BorderImage(pw, 10, 10)
// and write it
mw.WriteImage("text_barrel.png")
}
func main() {
imagick.Initialize()
defer imagick.Terminate()
mw := imagick.NewMagickWand()
defer mw.Destroy()
mw.ReadImage("logo:")
// We know that logo: is 640x480 but in the general case
// we need to get the dimensions of the image
w := mw.GetImageWidth()
h := mw.GetImageHeight()
// +matte is the same as -alpha off
// This does it the "new" way but if your IM doesn't have this
// then MagickSetImageMatte(mw,MagickFalse); can be used
mw.SetImageAlphaChannel(imagick.ALPHA_CHANNEL_DEACTIVATE)
// clone the input image
mwr := mw.Clone()
defer mwr.Destroy()
// Resize it
mwr.ResizeImage(w, h/2, imagick.FILTER_LANCZOS, 1)
// Flip the image over to form the reflection
mwr.FlipImage()
// Create the gradient image which will be used as the alpha
// channel in the reflection image
mwg := imagick.NewMagickWand()
defer mwg.Destroy()
mwg.SetSize(w, h/2)
mwg.ReadImage("gradient:white-black")
// Copy the gradient in to the alpha channel of the reflection image
mwr.CompositeImage(mwg, imagick.COMPOSITE_OP_COPY_OPACITY, 0, 0)
// Add the reflection image to the wand which holds the original image
mw.AddImage(mwr)
// Append the reflection to the bottom (MagickTrue) of the original image
mwout := mw.AppendImages(true)
defer mwout.Destroy()
// and save the result
mwout.WriteImage("logo_reflect.png")
}
func main() {
imagick.Initialize()
defer imagick.Terminate()
// Current coordinates of text
var dx, dy float64
// Width of a space in current font/size
var sx float64
mw := imagick.NewMagickWand()
dw := imagick.NewDrawingWand()
// Set the size of the image
mw.SetSize(300, 100)
//mw.SetImageAlphaChannel(imagick.CHANNEL_ALPHA)
mw.ReadImage("xc:white")
// DO NOT SET GRAVITY - it makes text placement more complicated
// (unless it does exactly what you wanted anyway).
// Start near the left edge
dx = 10
// If we know the largest font we're using, we can set the y coordinate
// fairly accurately. In this case it is the 72 point Times font, so to
// place the text such that the largest almost touches the top of the image
// we just add the text height to the descender to give the coordinate for
// our baseline.
// In this case the largest is the 72 point Times-New-Roman so I'll use that
// to compute the baseline
dw.SetFontSize(72)
dw.SetFont("Times-New-Roman")
fm := mw.QueryFontMetrics(dw, "M")
dy = fm.CharacterHeight + fm.Descender
// Note that we must free up the fontmetric array once we're done with it
// this
draw_setfont(mw, dw, "Arial", 48, "#40FF80", &sx)
draw_metrics(mw, dw, &dx, dy, sx, "this")
// is
// A NULL signals to draw_setfont that the font stays the same
draw_setfont(mw, dw, "", 24, "#8040BF", &sx)
draw_metrics(mw, dw, &dx, dy, sx, "is")
// my
draw_setfont(mw, dw, "Times-New-Roman", 18, "#BF00BF", &sx)
draw_metrics(mw, dw, &dx, dy, sx, "my")
// text
draw_setfont(mw, dw, "", 72, "#0F0FBF", &sx)
draw_metrics(mw, dw, &dx, dy, sx, "text")
mw.DrawImage(dw)
// Now write the magickwand image
mw.WriteImage("metric1.gif")
}
// Example 4
// Create a rotated gradient
// See: http://www.imagemagick.org/discourse-server/viewtopic.php?f=1&t=12707
// The affine in this one is essentially the same as the one in Example 2 but
// this example has a different use for the result
func example4() {
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)
// Dimensions of the final rectangle
w := uint(600)
h := uint(100)
// angle of clockwise rotation
theta := 15.0 // degrees
// Convert theta to radians
rad_theta := DegreesToRadians(theta)
// Compute the dimensions of the rectangular gradient
gw := (uint)(float64(w)*math.Cos(rad_theta) + float64(h)*math.Sin(rad_theta) + 0.5)
gh := (uint)(float64(w)*math.Sin(rad_theta) + float64(h)*math.Cos(rad_theta) + 0.5)
// Don't let the rotation make the gradient rectangle any smaller
// than the required output
if gw < w {
gw = w
}
if gh < h {
gh = h
}
mw := imagick.NewMagickWand()
defer mw.Destroy()
mw.SetSize(gw, gh)
mw.ReadImage("gradient:white-black")
// Initialize the required affines
// translate centre of gradient to origin
set_translate_affine(t1, float64(-gw)/2.0, float64(-gh)/2.0)
// rotate clockwise by theta degrees
set_rotate_affine(r, theta)
// translate back again
set_translate_affine(t2, float64(gw)/2.0, float64(gh)/2.0)
// Now multiply the affine sequences
// temp = t1*r
affine_multiply(temp, t1, r)
// result = temp*t2
affine_multiply(result, temp, t2)
mw.DistortImage(imagick.DISTORTION_AFFINE_PROJECTION, result, false)
// Get the size of the distorted image and crop out the middle
nw := mw.GetImageWidth()
nh := mw.GetImageHeight()
mw.CropImage(w, h, int((nw-w)/2), int((nh-h)/2))
mw.WriteImage("rotgrad_2.png")
}
func main() {
imagick.Initialize()
defer imagick.Terminate()
mw := imagick.NewMagickWand()
mw.SetSize(100, 100)
mw.ReadImage("plasma:red-yellow")
make_tile(mw, "tile_plasma.png")
mw.Destroy()
mw = imagick.NewMagickWand()
mw.SetSize(100, 100)
mw.ReadImage("xc:")
mw.AddNoiseImage(imagick.NOISE_RANDOM)
mw.SetImageVirtualPixelMethod(imagick.VIRTUAL_PIXEL_TILE)
mw.BlurImage(0, 10)
mw.NormalizeImage()
make_tile(mw, "tile_random.png")
mw.Destroy()
}
func main() {
imagick.Initialize()
defer imagick.Terminate()
dest := imagick.NewMagickWand()
defer dest.Destroy()
src := imagick.NewMagickWand()
defer src.Destroy()
mask := imagick.NewMagickWand()
defer mask.Destroy()
dest.SetSize(100, 100)
src.SetSize(100, 100)
if err := dest.ReadImage("tile:tile_water.jpg"); err != nil {
panic(err)
}
if err := mask.ReadImage("mask_bite.png"); err != nil {
panic(err)
}
// When you create a mask, you use white for those parts that you want
// to show through and black for those which must not show through.
// But internally it's the opposite so the mask must be negated
mask.NegateImage(false)
dest.SetImageClipMask(mask)
if err := src.ReadImage("tile:tile_disks.jpg"); err != nil {
panic(err)
}
// This does the src (overlay) over the dest (background)
dest.CompositeImage(src, imagick.COMPOSITE_OP_OVER, 0, 0)
dest.WriteImage("clip_out.jpg")
}
func NewImageFromBuffer(buffer io.Reader) (image *Image, err error) {
bytes, err := ioutil.ReadAll(buffer)
if err != nil {
return nil, err
}
image = &Image{Wand: imagick.NewMagickWand()}
err = image.Wand.ReadImageBlob(bytes)
if err != nil {
return nil, err
}
return image, nil
}
// Given a pattern name (which MUST have a leading #) and a pattern file,
// set up a pattern URL for later reference in the specified drawing wand
// Currently only used in Text Effect 2
func setTilePattern(dw *imagick.DrawingWand, pattern_name, pattern_file string) {
tw := imagick.NewMagickWand()
defer tw.Destroy()
tw.ReadImage(pattern_file)
// Read the tile's width and height
w := tw.GetImageWidth()
h := tw.GetImageHeight()
dw.PushPattern(pattern_name[1:], 0, 0, float64(w), float64(h))
dw.Composite(imagick.COMPOSITE_OP_SRC_OVER, 0, 0, 0, 0, tw)
dw.PopPattern()
dw.SetFillPatternURL(pattern_name)
}
func main() {
imagick.Initialize()
defer imagick.Terminate()
pw := imagick.NewPixelWand()
defer pw.Destroy()
pw.SetColor("white")
mw := imagick.NewMagickWand()
defer mw.Destroy()
// Create a 100x100 image with a default of white
mw.NewImage(100, 100, pw)
// Get a new pixel iterator
iterator := mw.NewPixelIterator()
defer iterator.Destroy()
for y := 0; y < int(mw.GetImageHeight()); y++ {
// Get the next row of the image as an array of PixelWands
pixels := iterator.GetNextIteratorRow()
if len(pixels) == 0 {
break
}
// Set the row of wands to a simple gray scale gradient
for x, pixel := range pixels {
if !pixel.IsVerified() {
panic("unverified pixel")
}
gray := x * 255 / 100
hex := fmt.Sprintf("#%02x%02x%02x", gray, gray, gray)
if ret := pixel.SetColor(hex); !ret {
panic("Could not set color in pixel")
}
}
// Sync writes the pixels back to the mw
if err := iterator.SyncIterator(); err != nil {
panic(err)
}
}
mw.WriteImage("bits_demo.gif")
}
// Example 3
// Reflect the image about a line passing through the origin.
// If the line makes an angle of D degrees with the horizontal
// then this can be done by rotating the image by -D degrees so
// that the line is now (in effect) the x axis, reflect the image
// across the x axis, and then rotate everything back again.
// In this example, rather than just picking an arbitrary angle,
// let's say that we want the "logo:" image to be reflected across
// it's own major diagonal. Although we know the logo: image is
// 640x480 let's also generalize the code slightly so that it
// will still work if the name of the input image is changed.
// If the image has a width "w" and height "h", then the angle between
// the x-axis and the major diagonal is atan(h/w) (NOTE that this
// result is in RADIANS!)
// For this example I will also retain the original dimensions of the
// image so that anything that is reflected outside the borders of the
// input image is lost
func example3() {
imagick.Initialize()
defer imagick.Terminate()
r1 := make([]float64, 6)
reflect := make([]float64, 6)
r2 := make([]float64, 6)
temp := make([]float64, 6)
result := make([]float64, 6)
var angle_degrees float64
mw := imagick.NewMagickWand()
defer mw.Destroy()
mw.ReadImage("logo:")
w := mw.GetImageWidth()
h := mw.GetImageHeight()
// Just convert the radians to degrees. This way I don't have
// to write a function which sets up an affine rotation for an
// argument specified in radians rather than degrees.
// You can always change this.
angle_degrees = RadiansToDegrees(math.Atan(float64(h) / float64(w)))
// Initialize the required affines
// Rotate diagonal to the x axis
set_rotate_affine(r1, -angle_degrees)
// Reflection affine (about x-axis)
// In this case there isn't a specific function to set the
// affine array (like there is for rotation and scaling)
// so use the function which sets an arbitrary affine
set_affine(reflect, 1, 0, 0, -1, 0, 0)
// rotate image back again
set_rotate_affine(r2, angle_degrees)
// temp = r1*reflect
affine_multiply(temp, r1, reflect)
// result = temp*r2
affine_multiply(result, temp, r2)
mw.DistortImage(imagick.DISTORTION_AFFINE_PROJECTION, result, false)
mw.WriteImage("logo_affine_3.jpg")
}
func main() {
imagick.Initialize()
defer imagick.Terminate()
var err error
mw := imagick.NewMagickWand()
defer mw.Destroy()
pw := imagick.NewPixelWand()
defer pw.Destroy()
pw.SetColor("blue")
err = mw.ReadImage("logo:")
if err != nil {
panic(err)
}
w := int(mw.GetImageWidth())
h := int(mw.GetImageHeight())
mw.SetImageBackgroundColor(pw)
// This centres the original image on the new canvas.
// Note that the extent's offset is relative to the
// top left corner of the *original* image, so adding an extent
// around it means that the offset will be negative
err = mw.ExtentImage(1024, 768, -(1024-w)/2, -(768-h)/2)
if err != nil {
panic(err)
}
// Set the compression quality to 95 (high quality = low compression)
err = mw.SetImageCompressionQuality(95)
if err != nil {
panic(err)
}
mw.DisplayImage(os.Getenv("DYSPLAY"))
if err != nil {
panic(err)
}
}
func usePixelIterator() {
imagick.Initialize()
defer imagick.Terminate()
/* Create a wand */
mw := imagick.NewMagickWand()
defer mw.Destroy()
/* Read the input image */
mw.ReadImage("logo:")
// Get a one-pixel region at coordinate 200,100
iterator := mw.NewPixelRegionIterator(200, 100, 1, 1)
defer iterator.Destroy()
pixels := iterator.GetNextIteratorRow()
// Modify the pixel
pixels[0].SetColor("red")
// then sync it back into the wand
iterator.SyncIterator()
mw.WriteImage("logo_pixel_iterator.gif")
}
func main() {
imagick.Initialize()
// Schedule cleanup
defer imagick.Terminate()
var err error
mw := imagick.NewMagickWand()
// Schedule cleanup
defer mw.Destroy()
err = mw.ReadImage("logo:")
if err != nil {
panic(err)
}
// Get original logo size
width := mw.GetImageWidth()
height := mw.GetImageHeight()
// Calculate half the size
hWidth := uint(width / 2)
hHeight := uint(height / 2)
// Resize the image using the Lanczos filter
// The blur factor is a float, where > 1 is blurry, < 1 is sharp
err = mw.ResizeImage(hWidth, hHeight, imagick.FILTER_LANCZOS, 1)
if err != nil {
panic(err)
}
// Set the compression quality to 95 (high quality = low compression)
err = mw.SetImageCompressionQuality(95)
if err != nil {
panic(err)
}
mw.DisplayImage(os.Getenv("DYSPLAY"))
if err != nil {
panic(err)
}
}
func useDraw() {
imagick.Initialize()
defer imagick.Terminate()
/* Create a wand */
mw := imagick.NewMagickWand()
defer mw.Destroy()
/* Read the input image */
mw.ReadImage("logo:")
fill := imagick.NewPixelWand()
defer fill.Destroy()
dw := imagick.NewDrawingWand()
defer dw.Destroy()
// Set the fill to "red" or you can do the same thing with this:
fill.SetColor("red")
dw.SetFillColor(fill)
// Uses the current Fill as the colour of the point at 200,100
dw.Point(200, 100)
mw.DrawImage(dw)
/* write it */
mw.WriteImage("logo_pixel_drawingwand.gif")
}
func main() {
imagick.Initialize()
defer imagick.Terminate()
mw := imagick.NewMagickWand()
defer mw.Destroy()
mw.ReadImage("logo:")
// A larger fuzz value allows more colours "near" white to be
// modified. A fuzz of zero only allows an exact match with the
// given colour
// Set up the pixelwand containing the colour to be "targeted"
// by transparency
target := imagick.NewPixelWand()
defer target.Destroy()
target.SetColor("white")
// Change the transparency of all colours which match target (with
// fuzz applied). In this case they are made completely transparent (0)
// but you can set this to any value from 0 to 1.
mw.TransparentPaintImage(target, 0, 10, false)
mw.WriteImage("logo_white.png")
}
// Text effect 8 - Shepard's distortion
func textEffect8() {
imagick.Initialize()
defer imagick.Terminate()
// This one uses d_args[0]
mw := imagick.NewMagickWand()
defer mw.Destroy()
dw := imagick.NewDrawingWand()
defer dw.Destroy()
pw := imagick.NewPixelWand()
defer pw.Destroy()
// Create a 320x200 transparent canvas
pw.SetColor("none")
mw.NewImage(640, 480, pw)
// Set up a 72 point font
dw.SetFont("Verdana-Bold-Italic")
dw.SetFontSize(72)
// Now draw the text
dw.Annotation(50, 240, "Magick Rocks")
// Draw the image on to the mw
mw.DrawImage(dw)
d_args[0] = 150.0
d_args[1] = 190.0
d_args[2] = 100.0
d_args[3] = 290.0
d_args[4] = 500.0
d_args[5] = 200.0
d_args[6] = 430.0
d_args[7] = 130.0
// DON'T FORGET to set the correct number of arguments here
mw.DistortImage(imagick.DISTORTION_SHEPARDS, d_args, true)
// Trim the image
mw.TrimImage(0)
// Add the border
pw.SetColor("none")
mw.BorderImage(pw, 10, 10)
// and write it
mw.WriteImage("text_shepards.png")
}
// Example 1.
// Rotate logo: by 90 degrees (about the origin), scale by 50 percent and
// then move the image 240 in the x direction
func example1() {
imagick.Initialize()
defer imagick.Terminate()
s := make([]float64, 6)
r := make([]float64, 6)
t := make([]float64, 6)
temp := make([]float64, 6)
result := make([]float64, 6)
mw := imagick.NewMagickWand()
defer mw.Destroy()
mw.ReadImage("logo:")
// Set up the affine matrices
// rotate 90 degrees clockwise
set_rotate_affine(r, 90)
// scale by .5 in x and y
set_scale_affine(s, 0.5, 0.5)
// translate to (240,0)
set_translate_affine(t, 240, 0)
// now multiply them - note the order in
// which they are specified - in particular beware that
// temp = r*s is NOT necessarily the same as temp = s*r
//first do the rotation and scaling
// temp = r*s
affine_multiply(temp, r, s)
// now the translation
// result = temp*t
affine_multiply(result, temp, t)
// and then apply the result to the image
mw.DistortImage(imagick.DISTORTION_AFFINE_PROJECTION, result, false)
mw.WriteImage("logo_affine_1.jpg")
}
func main() {
imagick.Initialize()
defer imagick.Terminate()
var err error
mw := imagick.NewMagickWand()
defer mw.Destroy()
// fillcolor and bordercolor
fc, bc := imagick.NewPixelWand(), imagick.NewPixelWand()
defer fc.Destroy()
defer bc.Destroy()
fc.SetColor("none")
bc.SetColor("white")
err = mw.ReadImage("logo:")
if err != nil {
panic(err)
}
rgba := imagick.CHANNELS_RGB | imagick.CHANNEL_ALPHA
// The bordercolor (with fuzz of 20 applied) is replaced by the fill
// colour starting at the given coordinate - in this case 0, 0.
// Normally the last argument is false so that the colours are matched
// but if it is true then it floodfills any pixel that does *not* match
// the target color
mw.FloodfillPaintImage(rgba, fc, 20, bc, 0, 0, false)
mw.DisplayImage(os.Getenv("DYSPLAY"))
if err != nil {
panic(err)
}
}
func main() {
imagick.Initialize()
defer imagick.Terminate()
/* First step is to create the gel shape:
convert -size 100x60 xc:none \
-fill red -draw 'circle 25,30 10,30' \
-draw 'circle 75,30 90,30' \
-draw 'rectangle 25,15 75,45' \
gel_shape.png
*/
/* Create a wand */
mw := imagick.NewMagickWand()
pw := imagick.NewPixelWand()
dw := imagick.NewDrawingWand()
mw.SetSize(100, 60)
mw.ReadImage("xc:none")
pw.SetColor("red")
dw.SetFillColor(pw)
dw.Circle(25, 30, 10, 30)
dw.Circle(75, 30, 90, 30)
dw.Rectangle(25, 15, 75, 45)
// Now we draw the Drawing wand on to the Magick Wand
mw.DrawImage(dw)
mw.WriteImage("gel_shape.png")
dw.Destroy()
pw.Destroy()
mw.Destroy()
/* Next step is to create the gel highlight:
convert gel_shape.png \
\( +clone -fx A +matte -blur 0x12 -shade 110x0 -normalize \
-sigmoidal-contrast 16,60% -evaluate multiply .5 \
-roll +5+10 +clone -compose Screen -composite \) \
-compose In -composite gel_highlight.png
*/
mw = imagick.NewMagickWand()
mw.ReadImage("gel_shape.png")
mwc := mw.Clone()
mwf, err := mwc.FxImage("A")
if err != nil {
panic(err)
}
mwf.SetImageAlphaChannel(imagick.ALPHA_CHANNEL_DEACTIVATE)
mwf.BlurImage(0, 12)
mwf.ShadeImage(true, 110, 0)
mwf.NormalizeImage()
// The last argument is specified as a percentage on the command line
// but is specified to the function as a percentage of the QuantumRange
mwf.SigmoidalContrastImage(true, 16, 0.6*imagick.QUANTUM_RANGE)
mwf.EvaluateImage(imagick.EVAL_OP_MULTIPLY, 0.5)
mwf.RollImage(5, 10)
mwc.Destroy()
// The +clone operation copies the original but only so that
// it can be used in the following composite operation, so we don't
// actually need to do a clone, just reference the original image.
mwf.CompositeImage(mw, imagick.COMPOSITE_OP_SCREEN, 0, 0)
mw.CompositeImage(mwf, imagick.COMPOSITE_OP_IN, 0, 0)
mw.WriteImage("gel_highlight.png")
mw.Destroy()
mwc.Destroy()
mwf.Destroy()
// Now create the gel border
/*
convert gel_highlight.png \
\( +clone -fx A +matte -blur 0x2 -shade 0x90 -normalize \
-blur 0x2 -negate -evaluate multiply .4 -negate -roll -.5-1 \
+clone -compose Multiply -composite \) \
-compose In -composite gel_border.png
*/
mw = imagick.NewMagickWand()
mw.ReadImage("gel_highlight.png")
mwc = mw.Clone()
mwf, err = mwc.FxImage("A")
if err != nil {
panic(err)
}
mwf.SetImageAlphaChannel(imagick.ALPHA_CHANNEL_DEACTIVATE)
mwf.BlurImage(0, 2)
mwf.ShadeImage(true, 0, 90)
mwf.NormalizeImage()
mwf.BlurImage(0, 2)
mwf.NegateImage(false)
mwf.EvaluateImage(imagick.EVAL_OP_MULTIPLY, 0.4)
mwf.NegateImage(false)
mwf.RollImage(-1, -1)
mwf.CompositeImage(mw, imagick.COMPOSITE_OP_MULTIPLY, 0, 0)
mw.CompositeImage(mwf, imagick.COMPOSITE_OP_IN, 0, 0)
mw.WriteImage("gel_border.png")
mw.Destroy()
mwc.Destroy()
mwf.Destroy()
// and finally the text and shadow effect
/*
convert gel_border.png \
-font Candice -pointsize 24 -fill white -stroke black \
-gravity Center -annotate 0 "Gel" -trim -repage 0x0+4+4 \
\( +clone -background navy -shadow 80x4+4+4 \) +swap \
-background none -flatten gel_button.png
*/
mw = imagick.NewMagickWand()
dw = imagick.NewDrawingWand()
pw = imagick.NewPixelWand()
mw.ReadImage("gel_border.png")
dw.SetFont("Lucida-Handwriting-Italic")
dw.SetFontSize(24)
pw.SetColor("white")
dw.SetFillColor(pw)
pw.SetColor("black")
dw.SetStrokeColor(pw)
dw.SetGravity(imagick.GRAVITY_CENTER)
// It is important to notice here that MagickAnnotateImage renders the text on
// to the MagickWand, NOT the DrawingWand. It only uses the DrawingWand for font
// and colour information etc.
mw.AnnotateImage(dw, 0, 0, 0, "Gel")
mw.TrimImage(0)
mw.ResetImagePage("0x0+4+4")
mwc = mw.Clone()
pw.SetColor("navy")
mwc.SetImageBackgroundColor(pw)
mwc.ShadowImage(80, 4, 4, 4)
mwf = imagick.NewMagickWand()
mwf.AddImage(mwc)
mwf.AddImage(mw)
mw.Destroy()
mwc.Destroy()
pw.SetColor("none")
mwf.SetImageBackgroundColor(pw)
mw = mwf.MergeImageLayers(imagick.IMAGE_LAYER_FLATTEN)
mw.WriteImage("gel_button.png")
mw.Destroy()
mwc.Destroy()
mwf.Destroy()
dw.Destroy()
pw.Destroy()
}