// 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 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")
}

// 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 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")
}

// 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")
}

// 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")
}

// Run starts the Halfshell program. Performs global (de)initialization, and
// starts the HTTP server.
func (h *Halfshell) Run() {
	var tmpl, _ = template.New("start").Parse(StartupTemplateString)
	_ = tmpl.Execute(os.Stdout, h)

	imagick.Initialize()
	defer imagick.Terminate()

	h.Server.ListenAndServe()
}

// Start the Halfshell program. Performs global (de)initialization, and
// starts the HTTP server.
func (h *Halfshell) Run() {
	var tmpl, _ = template.New("start").Parse(STARTUP_TEMPLATE_STRING)
	_ = tmpl.Execute(os.Stdout, h)

	imagick.Initialize()
	defer imagick.Terminate()

	h.Server.ListenAndServe()
}

// 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")
}

// 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")
}

// 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 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 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")
}

// 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")
}