示例#1
0
func BenchmarkFreetypeNonZeroWinding(b *testing.B) {
	var p Path
	p.LineTo(10, 190)
	draw2dbase.TraceCubic(&p, []float64{10, 190, 10, 10, 190, 10, 190, 190}, 0.5)

	poly := Polygon(p.points)
	color := color.RGBA{0, 0, 0, 0xff}

	for i := 0; i < b.N; i++ {
		img := image.NewRGBA(image.Rect(0, 0, 200, 200))
		rasterizer := raster.NewRasterizer(200, 200)
		rasterizer.UseNonZeroWinding = true
		rasterizer.Start(raster.Point{
			X: raster.Fix32(10 * 256),
			Y: raster.Fix32(190 * 256)})
		for j := 0; j < len(poly); j = j + 2 {
			rasterizer.Add1(raster.Point{
				X: raster.Fix32(poly[j] * 256),
				Y: raster.Fix32(poly[j+1] * 256)})
		}
		painter := raster.NewRGBAPainter(img)
		painter.SetColor(color)
		rasterizer.Rasterize(painter)
	}
}
示例#2
0
func main() {
	const (
		w = 400
		h = 400
	)
	r := raster.NewRasterizer(w, h)
	r.UseNonZeroWinding = true

	cjs := []struct {
		c raster.Capper
		j raster.Joiner
	}{
		{raster.RoundCapper, raster.RoundJoiner},
		{raster.ButtCapper, raster.BevelJoiner},
		{raster.SquareCapper, raster.BevelJoiner},
	}

	for i, cj := range cjs {
		var path raster.Path
		path.Start(fixed.P(30+100*i, 30+120*i))
		path.Add1(fixed.P(180+100*i, 80+120*i))
		path.Add1(fixed.P(50+100*i, 130+120*i))
		raster.Stroke(r, path, fixed.I(20), cj.c, cj.j)
	}

	rgba := image.NewRGBA(image.Rect(0, 0, w, h))
	draw.Draw(rgba, rgba.Bounds(), image.Black, image.Point{}, draw.Src)
	p := raster.NewRGBAPainter(rgba)
	p.SetColor(color.RGBA{0x7f, 0x7f, 0x7f, 0xff})
	r.Rasterize(p)

	white := color.RGBA{0xff, 0xff, 0xff, 0xff}
	for i := range cjs {
		rgba.SetRGBA(30+100*i, 30+120*i, white)
		rgba.SetRGBA(180+100*i, 80+120*i, white)
		rgba.SetRGBA(50+100*i, 130+120*i, white)
	}

	// Save that RGBA image to disk.
	outFile, err := os.Create("out.png")
	if err != nil {
		log.Println(err)
		os.Exit(1)
	}
	defer outFile.Close()
	b := bufio.NewWriter(outFile)
	err = png.Encode(b, rgba)
	if err != nil {
		log.Println(err)
		os.Exit(1)
	}
	err = b.Flush()
	if err != nil {
		log.Println(err)
		os.Exit(1)
	}
	fmt.Println("Wrote out.png OK.")
}
示例#3
0
文件: ftgc.go 项目: julianshen/draw2d
// NewGraphicContext creates a new Graphic context from an image.
func NewGraphicContext(img draw.Image) *GraphicContext {

	var painter Painter
	switch selectImage := img.(type) {
	case *image.RGBA:
		painter = raster.NewRGBAPainter(selectImage)
	default:
		panic("Image type not supported")
	}
	return NewGraphicContextWithPainter(img, painter)
}
示例#4
0
文件: raster.go 项目: zenoss/rog-go
// NewPainter returns a Painter that will draw from src onto
// dst using the Porter-Duff composition operator op.
func NewPainter(dst draw.Image, src image.Image, op draw.Op) (p raster.Painter) {
	defer func() { fmt.Printf("newpainter %T\n", p) }()
	if src, ok := src.(*image.Uniform); ok {
		switch dst := dst.(type) {
		case *image.Alpha:
			if _, _, _, a := src.RGBA(); a == 0xffff {
				switch op {
				case draw.Src:
					return &raster.AlphaSrcPainter{dst}
				case draw.Over:
					return &raster.AlphaOverPainter{dst}
				}
			}

		case *image.RGBA:
			p := raster.NewRGBAPainter(dst)
			p.SetColor(src)
			p.Op = op
			return p
		}
	}
	return &genericImagePainter{dst, src, op}
}
示例#5
0
func TestFreetypeNonZeroWinding(t *testing.T) {
	var p Path
	p.LineTo(10, 190)
	draw2dbase.TraceCubic(&p, []float64{10, 190, 10, 10, 190, 10, 190, 190}, 0.5)
	poly := Polygon(p.points)
	color := color.RGBA{0, 0, 0, 0xff}

	img := image.NewRGBA(image.Rect(0, 0, 200, 200))
	rasterizer := raster.NewRasterizer(200, 200)
	rasterizer.UseNonZeroWinding = true
	rasterizer.Start(raster.Point{
		X: raster.Fix32(10 * 256),
		Y: raster.Fix32(190 * 256)})
	for j := 0; j < len(poly); j = j + 2 {
		rasterizer.Add1(raster.Point{
			X: raster.Fix32(poly[j] * 256),
			Y: raster.Fix32(poly[j+1] * 256)})
	}
	painter := raster.NewRGBAPainter(img)
	painter.SetColor(color)
	rasterizer.Rasterize(painter)

	draw2dimg.SaveToPngFile("../output/raster/TestFreetypeNonZeroWinding.png", img)
}
示例#6
0
func genTwitterGif(tweets []anaconda.Tweet, username string, tid int64) (string, error) {
	wid := 440
	height := 220

	colList := color.Palette{
		color.RGBA{0x00, 0x00, 0x00, 0xFF},

		color.RGBA{0xFF, 0x33, 0x33, 0xFF},
		color.RGBA{0x33, 0xFF, 0x33, 0xFF},
		color.RGBA{0x33, 0x33, 0xFF, 0xFF},
		color.RGBA{0xFF, 0xFF, 0x33, 0xFF},
		color.RGBA{0xFF, 0x33, 0xFF, 0xFF},
		color.RGBA{0x33, 0xFF, 0xFF, 0xFF},
	}

	newList := []*image.Paletted{}
	delayList := []int{}
	fireworkList := []FireWork{}
	disposalList := []byte{}

	draw2d.SetFontFolder("static")

	for i := range tweets {
		f := genFireworkFromTweet(tweets, i, float64(wid), float64(height))
		fireworkList = append(fireworkList, f)
	}

	boundRect := image.Rect(0, 0, wid, height)

	for len(fireworkList) > 0 {
		rawImg := image.NewRGBA(boundRect)

		// TODO :: Create Custom Painter
		// which does blend up
		painter := raster.NewRGBAPainter(rawImg)
		gc := draw2dimg.NewGraphicContextWithPainter(rawImg, painter)

		gc.SetFontData(draw2d.FontData{
			Name: "Roboto",
		})

		gc.SetFontSize(8)

		gc.Clear()
		gc.SetFillColor(colList[0])
		gc.MoveTo(0, 0)
		gc.LineTo(0, float64(height))
		gc.LineTo(float64(wid), float64(height))
		gc.LineTo(float64(wid), 0)
		gc.Close()
		gc.Fill()

		newFList := []FireWork{}

		for _, f := range fireworkList {

			if f.d > 0 {
				f.d -= 1.0
			} else {

				gc.SetFillColor(colList[f.colID])
				gc.SetStrokeColor(colList[f.colID])

				gc.MoveTo(f.x, f.y)
				gc.FillStringAt(f.text, f.x-4, f.y+4)

				gc.MoveTo(f.x, f.y)
				gc.SetLineWidth(f.sz)
				gc.LineTo(f.x-f.dx, f.y-f.dy)
				for ns := 1.0; ns < f.sz; ns += 1.0 {
					gc.SetLineWidth(f.sz - ns)
					gc.LineTo(f.x-f.dx*ns*0.2, f.y-f.dy*ns*0.2)
				}
				gc.Stroke()

				f.x += f.dx
				f.y += f.dy
				f.t -= 1.0

				f.dy += 0.3
			}

			if f.t > 0 {
				newFList = append(newFList, f)
			} else if len(f.bundle) > 0 {
				for _, subF := range f.bundle {
					subF.x += f.x
					subF.y += f.y
					newFList = append(newFList, subF)
				}
			}
		}
		fireworkList = newFList

		// Make Pallette Image
		newImg := image.NewPaletted(boundRect, colList)
		for x := 0; x < wid; x++ {
			for y := 0; y < height; y++ {
				newImg.SetColorIndex(x, y, uint8(colList.Index(rawImg.At(x, y))))
			}
		}

		// Add Lists
		if len(newList) == 0 {
			disposalList = append(disposalList, gif.DisposalNone)
		} else {
			disposalList = append(disposalList, gif.DisposalPrevious)
		}

		newList = append(newList, newImg)
		delayList = append(delayList, 10)

	}

	log.Println("Saving gif with ", len(newList), " frames")

	gifData := gif.GIF{
		Image:           newList,
		Delay:           delayList,
		Disposal:        disposalList,
		LoopCount:       -1,
		BackgroundIndex: 0,

		Config: image.Config{
			ColorModel: colList,
			Width:      wid,
			Height:     height,
		},
	}

	fn := MakeGifFilename(username, tid)
	f, e := os.Create(fn)
	if e != nil {
		log.Println(e)
		return "", e
	}

	e = gif.EncodeAll(f, &gifData)
	if e != nil {
		log.Println(e)
		return "", e
	}

	return fn, nil
}
示例#7
0
文件: main.go 项目: Rudloff/platform
func main() {
	const (
		n = 17
		r = 64 * 80
	)
	s := fixed.Int26_6(r * math.Sqrt(2) / 2)
	t := fixed.Int26_6(r * math.Tan(math.Pi/8))

	m := image.NewRGBA(image.Rect(0, 0, 800, 600))
	draw.Draw(m, m.Bounds(), image.NewUniform(color.RGBA{63, 63, 63, 255}), image.ZP, draw.Src)
	mp := raster.NewRGBAPainter(m)
	mp.SetColor(image.Black)
	z := raster.NewRasterizer(800, 600)

	for i := 0; i < n; i++ {
		cx := fixed.Int26_6(6400 + 12800*(i%4))
		cy := fixed.Int26_6(640 + 8000*(i/4))
		c := fixed.Point26_6{X: cx, Y: cy}
		theta := math.Pi * (0.5 + 0.5*float64(i)/(n-1))
		dx := fixed.Int26_6(r * math.Cos(theta))
		dy := fixed.Int26_6(r * math.Sin(theta))
		d := fixed.Point26_6{X: dx, Y: dy}
		// Draw a quarter-circle approximated by two quadratic segments,
		// with each segment spanning 45 degrees.
		z.Start(c)
		z.Add1(c.Add(fixed.Point26_6{X: r, Y: 0}))
		z.Add2(c.Add(fixed.Point26_6{X: r, Y: t}), c.Add(fixed.Point26_6{X: s, Y: s}))
		z.Add2(c.Add(fixed.Point26_6{X: t, Y: r}), c.Add(fixed.Point26_6{X: 0, Y: r}))
		// Add another quadratic segment whose angle ranges between 0 and 90
		// degrees. For an explanation of the magic constants 128, 150, 181 and
		// 256, read the comments in the freetype/raster package.
		dot := 256 * pDot(d, fixed.Point26_6{X: 0, Y: r}) / (r * r)
		multiple := fixed.Int26_6(150-(150-128)*(dot-181)/(256-181)) >> 2
		z.Add2(c.Add(fixed.Point26_6{X: dx, Y: r + dy}.Mul(multiple)), c.Add(d))
		// Close the curve.
		z.Add1(c)
	}
	z.Rasterize(mp)

	for i := 0; i < n; i++ {
		cx := fixed.Int26_6(6400 + 12800*(i%4))
		cy := fixed.Int26_6(640 + 8000*(i/4))
		for j := 0; j < n; j++ {
			theta := math.Pi * float64(j) / (n - 1)
			dx := fixed.Int26_6(r * math.Cos(theta))
			dy := fixed.Int26_6(r * math.Sin(theta))
			m.Set(int((cx+dx)/64), int((cy+dy)/64), color.RGBA{255, 255, 0, 255})
		}
	}

	// Save that RGBA image to disk.
	outFile, err := os.Create("out.png")
	if err != nil {
		log.Println(err)
		os.Exit(1)
	}
	defer outFile.Close()
	b := bufio.NewWriter(outFile)
	err = png.Encode(b, m)
	if err != nil {
		log.Println(err)
		os.Exit(1)
	}
	err = b.Flush()
	if err != nil {
		log.Println(err)
		os.Exit(1)
	}
	fmt.Println("Wrote out.png OK.")
}
示例#8
0
文件: sparkline.go 项目: tv42/quobar
func (s *Sparkline) Draw(dst draw.Image) {
	if len(s.data) == 0 {
		return
	}

	min := s.data[0]
	max := s.data[0]
	for _, n := range s.data[1:] {
		if n < min {
			min = n
		}
		if n > max {
			max = n
		}
	}

	// try to be helpful when there's limited data
	if max < 1.0 {
		max = 1.0
	}
	if min > max-1.0 {
		min = max - 1.0
		if min < 0.0 {
			min = 0.0
		}
	}

	bounds := dst.Bounds()
	dx, dy := bounds.Dx(), bounds.Dy()

	tmp := image.NewRGBA(image.Rectangle{Max: image.Point{X: dx, Y: dy}})
	p := raster.NewRGBAPainter(tmp)

	r := raster.NewRasterizer(dx, dy)
	r.UseNonZeroWinding = true

	var q raster.Path
	q.Start(s.scale(0, s.data[0], min, max, dx, dy))
	for i, n := range s.data[1:] {
		pt := s.scale(i+1, n, min, max, dx, dy)
		q.Add1(pt)
	}
	const strokeWidth = fixed.Int26_6(5 << 6)
	r.AddStroke(q, strokeWidth, raster.RoundCapper, raster.RoundJoiner)
	p.SetColor(s.fg)
	r.Rasterize(p)

	r.Clear()
	q.Clear()
	headPt := s.scale(len(s.data)-1, s.data[len(s.data)-1], min, max, dx, dy)
	q.Start(headPt)
	// miniscule nudge so something actually is output
	q.Add1(headPt.Add(fixed.Point26_6{X: 1, Y: 1}))
	const headWidth = fixed.Int26_6(8 << 6)
	r.AddStroke(q, headWidth, raster.RoundCapper, raster.RoundJoiner)
	// TODO really decide between uint64 vs float32 vs uint32 etc
	//	value := uint64((s.data[len(s.data)-1] - min) / max * float32(^uint64(0)))
	value := uint64(s.data[len(s.data)-1])
	headColor := PickColor(s.thresholds, value)
	p.SetColor(headColor)
	r.Rasterize(p)
	draw.Draw(dst, bounds, tmp, image.ZP, draw.Over)
}
示例#9
0
文件: graph.go 项目: rsc/tmp
func Handler(w http.ResponseWriter, req *http.Request) {
	const size = 500
	c := image.NewRGBA(image.Rect(0, 0, size, size))
	white := &image.Uniform{C: color.White}
	draw.Draw(c, c.Bounds(), white, image.ZP, draw.Src)

	p := raster.NewRGBAPainter(c)
	p.SetColor(color.Black)
	r := raster.NewRasterizer(500, 500)
	r.UseNonZeroWinding = true
	var path raster.Path
	path.Start(nudge(fixed.P(50, 50)))
	path.Add1(nudge(fixed.P(50, 450)))
	path.Add1(nudge(fixed.P(450, 450)))
	r.AddStroke(path, fixed.I(2), raster.ButtCapper, raster.BevelJoiner)
	r.Rasterize(p)
	r.Clear()

	p.SetColor(color.Gray16{0x7FFF})
	path.Clear()
	r.Clear()
	path.Start(nudge(fixed.P(450, 450)))
	path.Add1(nudge(fixed.P(450, 50)))
	path.Add1(nudge(fixed.P(50, 50)))
	r.AddStroke(path, fixed.I(1), raster.ButtCapper, raster.BevelJoiner)
	r.Rasterize(p)

	p.SetColor(color.Gray16{0x7FFF})
	for x := 50; x <= 450; x += 50 {
		path.Clear()
		path.Start(nudge(fixed.P(x, 450)))
		path.Add1(nudge(fixed.P(x, 460)))
		r.AddStroke(path, fixed.I(1), raster.ButtCapper, raster.BevelJoiner)
	}
	for x := 50; x <= 450; x += 50 {
		path.Clear()
		path.Start(nudge(fixed.P(50, x)))
		path.Add1(nudge(fixed.P(40, x)))
		r.AddStroke(path, fixed.I(1), raster.ButtCapper, raster.BevelJoiner)
	}
	r.Rasterize(p)

	p.SetColor(color.RGBA{0x00, 0x00, 0xFF, 0xFF})
	r.Clear()
	path.Clear()
	path.Start(nudge(fixed.P(50, 450)))
	path.Add1(nudge(fixed.P(450, 50)))
	r.AddStroke(path, fixed.I(1), raster.ButtCapper, raster.BevelJoiner)
	r.Rasterize(p)

	p.SetColor(color.RGBA{0xCC, 0x00, 0x00, 0xFF})
	r.Clear()
	window := fixed.Rectangle26_6{fixed.P(50, 450), fixed.P(450, 50)}
	//	path = plotPath(ratSin, big.NewRat(0, 1), big.NewRat(-1, 1), big.NewRat(10, 1), big.NewRat(1, 1), window)

	//	path = plotPath(ratProb, big.NewRat(0, 1), big.NewRat(0, 1), big.NewRat(1, 1<<57), big.NewRat(1, 1<<57), window)

	var lo, hi *big.Rat
	var locap, hicap, scalecap string
	id, _ := strconv.Atoi(req.FormValue("x"))
	switch id {
	case 0:
		lo = big.NewRat(1<<53-1<<3, 1<<54)
		hi = big.NewRat(1<<53+1<<3, 1<<54)
		locap = "1/2 - 1/2^51"
		hicap = "1/2 + 1/2^51"
		scalecap = "1/2^53"
	case 1:
		lo = big.NewRat(1<<54-1<<4, 1<<54)
		hi = big.NewRat(1<<54, 1<<54)
		locap = "1 - 1/2^50"
		hicap = "1"
		scalecap = "1/2^53"
	case 2:
		lo = big.NewRat(0, 1<<54)
		hi = big.NewRat(1<<4, 1<<54)
		locap = "0"
		hicap = "1/2^50"
		scalecap = "1/2^53"
	case 3:
		lo = big.NewRat(0, 1<<54)
		hi = big.NewRat(1<<2, 1<<62)
		locap = "0"
		hicap = "1/2^59"
		scalecap = "1/2^63"
	}

	mode, _ := strconv.Atoi(req.FormValue("mode"))
	path = plotPath(ratProb(mode), lo, lo, hi, hi, window)
	r.AddStroke(path, fixed.I(1), raster.ButtCapper, raster.BevelJoiner)
	r.Rasterize(p)

	var modestr string
	switch mode {
	case 0:
		modestr = "original behavior (can return 1)"
	case 1:
		modestr = "new behavior (too much 0)"
	case 2:
		modestr = "retry loop"
	}

	data, err := ioutil.ReadFile("/tmp/luxisr.ttf")
	if err != nil {
		panic(err)
	}
	tfont, err := freetype.ParseFont(data)
	if err != nil {
		panic(err)
	}
	const pt = 10
	ft := freetype.NewContext()
	ft.SetDst(c)
	ft.SetDPI(100)
	ft.SetFont(tfont)
	ft.SetFontSize(float64(pt))
	ft.SetSrc(image.NewUniform(color.Black))

	ft.SetClip(image.Rect(0, 0, 0, 0))
	wid, err := ft.DrawString(locap, freetype.Pt(0, 0))
	if err != nil {
		panic(err)
	}
	pp := freetype.Pt(50, 480)
	pp.X -= wid.X / 2
	ft.SetClip(c.Bounds())
	ft.DrawString(locap, pp)

	ft.SetClip(image.Rect(0, 0, 0, 0))
	wid, err = ft.DrawString(hicap, freetype.Pt(0, 0))
	if err != nil {
		panic(err)
	}
	pp = freetype.Pt(450, 480)
	pp.X -= wid.X / 2
	ft.SetClip(c.Bounds())
	ft.DrawString(hicap, pp)

	r.Clear()
	p.SetColor(color.Black)
	path.Clear()
	const dy = 5
	path.Start(nudge(fixed.P(400, 400)))
	path.Add1(nudge(fixed.P(400, 400-dy)))
	path.Add1(nudge(fixed.P(400, 400+dy)))
	path.Add1(nudge(fixed.P(400, 400)))
	path.Add1(nudge(fixed.P(450, 400)))
	path.Add1(nudge(fixed.P(450, 400-dy)))
	path.Add1(nudge(fixed.P(450, 400+dy)))
	path.Add1(nudge(fixed.P(450, 400)))
	r.AddStroke(path, fixed.I(2), raster.ButtCapper, raster.BevelJoiner)
	r.Rasterize(p)

	ft.SetClip(image.Rect(0, 0, 0, 0))
	wid, err = ft.DrawString(scalecap, freetype.Pt(0, 0))
	if err != nil {
		panic(err)
	}
	pp = freetype.Pt(425, 420)
	pp.X -= wid.X / 2
	ft.SetClip(c.Bounds())
	ft.DrawString(scalecap, pp)

	ft.SetClip(image.Rect(0, 0, 0, 0))
	wid, err = ft.DrawString(modestr, freetype.Pt(0, 0))
	if err != nil {
		panic(err)
	}
	pp = freetype.Pt(250, 490)
	pp.X -= wid.X / 2
	ft.SetClip(c.Bounds())
	ft.DrawString(modestr, pp)

	w.Write(pngEncode(c))
}