Exemple #1
0
func main() {
	var cx, cy, cw, ch, midy int
	message := "Now is the time for all good men to come to the aid of the party"

	w, h := openvg.Init()
	var speed openvg.VGfloat = 0.5
	var x openvg.VGfloat = 0
	midy = (h / 2)
	fontsize := w / 50
	cx = 0
	ch = fontsize * 2
	cw = w
	cy = midy - (ch / 2)

	rx, ry, rw, rh := openvg.VGfloat(cx), openvg.VGfloat(cy), openvg.VGfloat(cw), openvg.VGfloat(ch)
	// scroll the text, only in the clipping rectangle
	for x = 0; x < rw+speed; x += speed {
		openvg.Start(w, h)
		openvg.Background(255, 255, 255)
		openvg.FillRGB(0, 0, 0, .2)
		openvg.Rect(rx, ry, rw, rh)
		openvg.ClipRect(cx, cy, cw, ch)
		openvg.Translate(x, ry+openvg.VGfloat(fontsize/2))
		openvg.FillRGB(0, 0, 0, 1)
		openvg.Text(0, 0, message, "sans", fontsize)
		openvg.ClipEnd()
		openvg.End()
	}
	bufio.NewReader(os.Stdin).ReadBytes('\n')
	openvg.Finish()
	os.Exit(0)
}
Exemple #2
0
// imgtest draws images at the corners and center
func imagetest(w, h int) {
	openvg.Start(w, h)
	imgw := 422
	imgh := 238
	fiw := openvg.VGfloat(imgw)
	fih := openvg.VGfloat(imgh)
	fw := openvg.VGfloat(w)
	fh := openvg.VGfloat(h)
	vgzero := openvg.VGfloat(0.0)
	cx := (fw / 2) - (fiw / 2)
	cy := (fh / 2) - (fih / 2)
	ulx := vgzero
	uly := fh - fih
	urx := fw - fiw
	ury := uly
	llx := vgzero
	lly := vgzero
	lrx := urx
	lry := lly
	openvg.Start(w, h)
	openvg.Background(0, 0, 0)
	openvg.Image(cx, cy, imgw, imgh, "desert1.jpg")
	openvg.Image(ulx, uly, imgw, imgh, "desert2.jpg")
	openvg.Image(urx, ury, imgw, imgh, "desert3.jpg")
	openvg.Image(llx, lly, imgw, imgh, "desert4.jpg")
	openvg.Image(lrx, lry, imgw, imgh, "desert5.jpg")
	openvg.End()
}
Exemple #3
0
func main() {
	var color string
	openvg.Start(width, height)
	openvg.Background(200, 200, 200)
	for i := 0; i < niter; i++ {
		x := random(0, width)
		y := random(height/3, (height*2)/3)
		r := random(0, 10000)
		switch {
		case r >= 0 && r <= 2500:
			color = "white"
		case r > 2500 && r <= 5000:
			color = "maroon"
		case r > 5000 && r <= 7500:
			color = "gray"
		case r > 7500 && r <= 10000:
			color = "black"
		}
		openvg.FillColor(color, openvg.VGfloat(opacity))
		openvg.Circle(openvg.VGfloat(x), openvg.VGfloat(y), openvg.VGfloat(size))
	}
	openvg.End()
	bufio.NewReader(os.Stdin).ReadByte()
	openvg.Finish()
}
Exemple #4
0
// loadimage loads all the images of the deck into a map for later display
func loadimage(d deck.Deck, m map[string]image.Image) {
	firstrun++
	w, h := d.Canvas.Width, d.Canvas.Height
	cw := openvg.VGfloat(w)
	ch := openvg.VGfloat(h)
	msize := int(cw * .01)
	mx := cw / 2
	my := ch * 0.05
	mbg := "white"
	mfg := "black"
	for ns, s := range d.Slide {
		for ni, i := range s.Image {
			if !modfile(i.Name, StartTime) {
				continue
			}
			openvg.Start(w, h)
			if i.Link != "" {
				fmt.Fprintf(os.Stderr, "Found altimg %s\n", i.Link)
			}
			f, err := os.Open(i.Name)
			if err != nil {
				fmt.Fprintf(os.Stderr, "%v\n", err)
				continue
			}
			img, _, err := image.Decode(f)
			if err != nil {
				fmt.Fprintf(os.Stderr, "%v\n", err)
				continue
			}
			openvg.FillColor(mbg)
			openvg.Rect(0, 0, cw, ch)
			openvg.FillColor(mfg)
			openvg.TextMid(mx, my, fmt.Sprintf("Loading image %s %d from slide %d", i.Name, ni, ns), "sans", msize)
			bounds := img.Bounds()
			iw := i.Width
			ih := i.Height
			if i.Scale > 0 {
				iw = int(float64(iw) * (i.Scale / 100))
				ih = int(float64(ih) * (i.Scale / 100))
			}
			// if the specified dimensions are native use those, otherwise resize
			if iw == (bounds.Max.X-bounds.Min.X) && ih == (bounds.Max.Y-bounds.Min.Y) {
				m[i.Name] = img
			} else {
				g := gift.New(gift.Resize(iw, ih, gift.BoxResampling))
				resized := image.NewRGBA(g.Bounds(img.Bounds()))
				g.Draw(resized, img)
				m[i.Name] = resized
			}
			f.Close()
			openvg.End()
		}
	}
}
Exemple #5
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func arrowhand(cx, cy, px, py, r openvg.VGfloat, t float64, value int, color string) {
	ax := []openvg.VGfloat{cx, 0, px, 0, cx}
	ay := []openvg.VGfloat{cy, 0, py, 0, cy}
	t = minadjust(t, value) * deg2rad
	rf := float64(r * 0.9)
	tf := math.Pi / 45.0
	ax[1] = cx + openvg.VGfloat(rf*math.Cos(t-tf))
	ay[1] = cy + openvg.VGfloat(rf*math.Sin(t-tf))
	ax[3] = cx + openvg.VGfloat(rf*math.Cos(t+tf))
	ay[3] = cy + openvg.VGfloat(rf*math.Sin(t+tf))
	openvg.FillColor(color)
	openvg.Polygon(ax, ay)
}
Exemple #6
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// raspberry pi, scaled to the screen dimensions
func raspi(w, h int, s string) {
	midx := openvg.VGfloat(w) / 2
	midy := openvg.VGfloat(h) / 2
	rw := midx
	rh := (rw * 2) / 3
	fontsize := w / 25
	openvg.Start(w, h)
	openvg.Background(255, 255, 255)
	makepi(midx-(rw/2), midy-(rh/2), rw, rh)
	openvg.FillRGB(128, 0, 0, 1)
	openvg.TextMid(midx, midy-(rh/2)-openvg.VGfloat(fontsize*2), s, "sans", fontsize)
	openvg.End()
}
Exemple #7
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//planets is an exploration of scale
func planets(width, height int, message string) {

	w := openvg.VGfloat(width)
	h := openvg.VGfloat(height)
	y := h / 2

	margin := openvg.VGfloat(100.0)
	minsize := openvg.VGfloat(7.0)
	labeloc := openvg.VGfloat(100.0)
	bgcolor := "black"
	labelcolor := "white"
	maxsize := (h / 2) * 0.05

	origin := sun.distance
	mostDistant := neptune.distance
	firstSize := mercury.radius
	lastSize := neptune.radius

	openvg.Start(width, height)
	openvg.BackgroundColor(bgcolor)

	for _, p := range solarSystem {
		x := vmap(p.distance, origin, mostDistant, margin, w-margin)
		r := vmap(p.radius, firstSize, lastSize, minsize, maxsize)

		if p.name == "Sun" {
			openvg.FillRGB(p.color.Red, p.color.Green, p.color.Blue, 1)
			openvg.Circle(margin-(r/2), y, r)
		} else {
			light(x, y, r, p.color)
			openvg.Circle(x, y, r)
			if p.name == "Saturn" {
				ringwidth := r * 2.35 // Saturn's rings are over 2x the planet radius
				openvg.StrokeWidth(3)
				openvg.StrokeRGB(p.color.Red, p.color.Green, p.color.Blue, 1)
				openvg.Line((x - ringwidth/2), y, (x + ringwidth/2), y)
				openvg.StrokeWidth(0)
			}
		}
		if p.name == "Earth" && len(message) > 1 {
			openvg.StrokeColor(labelcolor)
			openvg.StrokeWidth(1)
			openvg.Line(x, y+(r/2), x, y+labeloc)
			openvg.StrokeWidth(0)
			openvg.FillColor(labelcolor)
			openvg.TextMid(x, y+labeloc+10, message, "sans", 12)
		}
	}
	openvg.End()
}
Exemple #8
0
func draw(w, h openvg.VGfloat) {
	paintBG(w, h)

	var p particle
	var grav = openvg.VGfloat(gravity)
	for i := 0; i < nparticles; i++ {
		p = particles[i]
		openvg.FillRGB(p.r, p.g, p.b, 1)
		openvg.Circle(p.x, p.y, p.radius)

		// Apply the velocity
		p.x += p.vx
		p.y += p.vy

		p.vx *= 0.98
		if p.vy > 0 {
			p.vy *= 0.97
		}

		// Gravity
		p.vy -= grav

		// Stop p leaving the canvas
		if p.x < -50 {
			p.x = w + 50
		}
		if p.x > w+50 {
			p.x = -50
		}

		// When particle reaches the bottom of screen reset velocity & start posn
		if p.y < -50 {
			p.x = 0
			p.y = 0
			p.vx = openvg.VGfloat(rand.Intn(maxrand)%30) + 30
			p.vy = openvg.VGfloat(rand.Intn(maxrand)%20) + 40

			if directionRTL {
				p.vx *= -1
				p.x = w
			}
		}

		if p.y > h+50 {
			p.y = -50
		}
		particles[i] = p
	}
	openvg.End()
}
Exemple #9
0
func combohand(cx, cy, px, py, r, stroke openvg.VGfloat, t float64, value int, color string) {
	thinr := float64(r * 0.25)
	t = minadjust(t, value) * deg2rad
	tx := cx + openvg.VGfloat(thinr*math.Cos(t))
	ty := cy + openvg.VGfloat(thinr*math.Sin(t))
	openvg.FillColor(color)
	openvg.Ellipse(px, py, stroke*2, stroke*2)
	openvg.Ellipse(tx, ty, stroke*2, stroke*2)
	openvg.StrokeWidth(stroke)
	openvg.StrokeColor(color)
	openvg.Line(cx, cy, tx, ty)
	openvg.StrokeWidth(stroke * 2)
	openvg.Line(tx, ty, px, py)
	openvg.StrokeWidth(0)
}
Exemple #10
0
// raspberry pi, scaled to the screen dimensions
func main() {
	w, h := openvg.Init()
	midx := openvg.VGfloat(w) / 2
	midy := openvg.VGfloat(h) / 2
	rw := midx
	rh := (rw * 2) / 3
	fontsize := w / 25
	openvg.Start(w, h)
	openvg.Background(255, 255, 255)
	makepi(midx-(rw/2), midy-(rh/2), rw, rh)
	makepi(200, 100, 75, 50)
	openvg.FillRGB(128, 0, 0, 1)
	openvg.TextMid(midx, midy-(rh/2)-openvg.VGfloat(fontsize*2), "The Raspberry Pi", "sans", fontsize)
	WaitEnd()
}
Exemple #11
0
func main() {

	width, height := openvg.Init()

	w := openvg.VGfloat(width)
	h := openvg.VGfloat(height)
	y := h / 2
	var (
		margin  openvg.VGfloat = 100.0
		minsize openvg.VGfloat = 7.0
		labeloc openvg.VGfloat = 100.0
	)
	bgcolor := "black"
	labelcolor := "white"
	maxsize := (h / 2) * 0.05

	origin := sun.distance
	mostDistant := neptune.distance
	firstSize := mercury.radius
	lastSize := neptune.radius

	openvg.Start(width, height)
	openvg.BackgroundColor(bgcolor)

	for _, p := range solarSystem {
		x := vmap(p.distance, origin, mostDistant, margin, w-margin)
		r := vmap(p.radius, firstSize, lastSize, minsize, maxsize)

		if p.name == "Sun" {
			openvg.FillRGB(p.color.Red, p.color.Green, p.color.Blue, 1)
			openvg.Circle(margin-(r/2), y, r)
		} else {
			light(x, y, r, p.color)
			openvg.Circle(x, y, r)
		}
		if p.name == "Earth" && len(os.Args) > 1 {
			openvg.StrokeColor(labelcolor)
			openvg.StrokeWidth(1)
			openvg.Line(x, y+(r/2), x, y+labeloc)
			openvg.StrokeWidth(0)
			openvg.FillColor(labelcolor)
			openvg.TextMid(x, y+labeloc+10, os.Args[1], "sans", 12)
		}
	}
	openvg.End()
	bufio.NewReader(os.Stdin).ReadByte()
	openvg.Finish()
}
Exemple #12
0
// adjust the font to fit within a width
func (f *FW) fitwidth(width, adj int, s string) {
	f.tw = openvg.TextWidth(s, f.font, f.fontsize)
	for f.tw > openvg.VGfloat(width) {
		f.fontsize -= adj
		f.tw = openvg.TextWidth(s, f.font, f.fontsize)
	}
}
Exemple #13
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// rshapes draws shapes with random colors, openvg.Strokes, and sizes.
func rshapes(width, height, n int) {

	var sx, sy, cx, cy, px, py, ex, ey, pox, poy openvg.VGfloat

	np := 10
	polyx := make([]openvg.VGfloat, np)
	polyy := make([]openvg.VGfloat, np)
	openvg.Start(width, height)
	for i := 0; i < n; i++ {
		openvg.FillRGB(randcolor(), randcolor(), randcolor(), openvg.VGfloat(rand.Float32()))
		openvg.Ellipse(randf(width), randf(height), randf(200), randf(100))
		openvg.Circle(randf(width), randf(height), randf(100))
		openvg.Rect(randf(width), randf(height), randf(200), randf(100))
		openvg.Arc(randf(width), randf(height), randf(200), randf(200), randf(360), randf(360))

		sx = randf(width)
		sy = randf(height)
		openvg.StrokeRGB(randcolor(), randcolor(), randcolor(), 1)
		openvg.StrokeWidth(randf(5))
		openvg.Line(sx, sy, sx+randf(200), sy+randf(100))
		openvg.StrokeWidth(0)

		sx = randf(width)
		sy = randf(height)
		ex = sx + randf(200)
		ey = sy
		cx = sx + ((ex - sx) / 2.0)
		cy = sy + randf(100)
		openvg.Qbezier(sx, sy, cx, cy, ex, ey)

		sx = randf(width)
		sy = randf(height)
		ex = sx + randf(200)
		ey = sy
		cx = sx + ((ex - sx) / 2.0)
		cy = sy + randf(100)
		px = cx
		py = sy - randf(100)
		openvg.Cbezier(sx, sy, cx, cy, px, py, ex, ey)

		pox = randf(width)
		poy = randf(height)
		for j := 0; j < np; j++ {
			polyx[j] = pox + randf(200)
			polyy[j] = poy + randf(100)
		}
		openvg.Polygon(polyx, polyy) // , np)

		pox = randf(width)
		poy = randf(height)
		for j := 0; j < np; j++ {
			polyx[j] = pox + randf(200)
			polyy[j] = poy + randf(100)
		}
		openvg.Polyline(polyx, polyy) // , np)
	}
	openvg.FillRGB(128, 0, 0, 1)
	openvg.Text(20, 20, "OpenVG on the Raspberry Pi", "sans", 32)
	openvg.End()
}
Exemple #14
0
func main() {
	width, height := openvg.Init() // OpenGL, etc initialization

	w2 := openvg.VGfloat(width / 2)
	h2 := openvg.VGfloat(height / 2)
	w := openvg.VGfloat(width)

	openvg.Start(width, height)                               // Start the picture
	openvg.BackgroundColor("black")                           // Black background
	openvg.FillRGB(44, 100, 232, 1)                           // Big blue marble
	openvg.Circle(w2, 0, w)                                   // The "world"
	openvg.FillColor("white")                                 // White text
	openvg.TextMid(w2, h2, "hello, world", "serif", width/10) // Greetings
	openvg.End()                                              // End the picture
	bufio.NewReader(os.Stdin).ReadBytes('\n')                 // Pause until [RETURN]
	openvg.Finish()                                           // Graphics cleanup
}
Exemple #15
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// tb draws a block of text
func tb(w, h int) {
	para := []string{
		"For lo,",
		"the winter is past,",
		"the rain is over and gone",
		"the flowers appear on the earth;",
		"the time for the singing of birds is come,",
		"and the voice of the turtle is heard in our land",
	}

	tmargin := openvg.VGfloat(w) * 0.50
	lmargin := openvg.VGfloat(w) * 0.10
	top := openvg.VGfloat(h) * .9
	mid := openvg.VGfloat(h) * .6
	bot := openvg.VGfloat(h) * .3

	fontsize := 24
	leading := openvg.VGfloat(40.0)
	lfontsize := fontsize * 2
	midb := ((leading * 2) + (leading / 2)) - openvg.VGfloat(lfontsize/2)

	openvg.Start(w, h)
	openvg.FillRGB(49, 79, 79, 1)
	textlines(tmargin, top, para, "serif", fontsize, leading)
	textlines(tmargin, mid, para, "sans", fontsize, leading)
	textlines(tmargin, bot, para, "mono", fontsize, leading)
	openvg.Text(lmargin, top-midb, "Serif", "sans", lfontsize)
	openvg.Text(lmargin, mid-midb, "Sans", "sans", lfontsize)
	openvg.Text(lmargin, bot-midb, "Mono", "sans", lfontsize)
	openvg.End()
}
Exemple #16
0
// Initialize _all_ the particles
func initParticles(w, h openvg.VGfloat) {
	particles = make([]particle, nparticles)
	for i := 0; i < nparticles; i++ {
		particles[i].x = 0
		particles[i].y = 0
		particles[i].vx = openvg.VGfloat(rand.Intn(maxrand)%30) + 30/100
		particles[i].vy = openvg.VGfloat(rand.Intn(maxrand)%20) + 40/100
		particles[i].r = uint8(rand.Intn(255))
		particles[i].g = uint8(rand.Intn(255))
		particles[i].b = uint8(rand.Intn(255))
		particles[i].radius = openvg.VGfloat(rand.Intn(maxrand)%20) + 20

		if directionRTL {
			particles[i].vx *= -0.01
			particles[i].x = w
		}
	}
}
Exemple #17
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// dodeck sets up the graphics environment and kicks off the interaction
func dodeck(filename, searchterm string, pausetime time.Duration, slidenum, cw, ch int, gp float64) {
	firstrun = 0
	w, h := openvg.Init()
	openvg.FillRGB(200, 200, 200, 1)
	openvg.Rect(0, 0, openvg.VGfloat(w), openvg.VGfloat(h))
	if cw > 0 {
		w = cw
	}
	if ch > 0 {
		h = ch
	}
	if pausetime == 0 {
		interact(filename, searchterm, w, h, slidenum, gp)
	} else {
		loop(filename, w, h, slidenum, pausetime)
	}
	openvg.Finish()
}
Exemple #18
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func PlayVideo(w, h int) {

	for {
		openvg.Video(openvg.VGfloat(w-900), openvg.VGfloat(h-600), openvg.VGfloat(800), openvg.VGfloat(600), "siATM_video2.mpg.h264")
		openvg.Video(openvg.VGfloat(w-900), openvg.VGfloat(h-600), openvg.VGfloat(800), openvg.VGfloat(600), "sketchers_15s.ogv.h264")
	}

	//openvg.Video(openvg.VGfloat(w-800),openvg.VGfloat(h-600),openvg.VGfloat(800),openvg.VGfloat(600),"test.h264")
	//openvg.Video(openvg.VGfloat(w-800),openvg.VGfloat(h-600),openvg.VGfloat(800),openvg.VGfloat(600),"test.h264")

}
Exemple #19
0
func gradient(width, height int) {
	w := openvg.VGfloat(width)
	h := openvg.VGfloat(height)
	stops := []openvg.Offcolor{
		{0.0, openvg.RGB{255, 255, 255}, 1.0},
		{0.5, openvg.RGB{128, 128, 128}, 1.0},
		{1.0, openvg.RGB{0, 0, 0}, 1.0},
	}

	x1 := w / 8
	x2 := (w * 3) / 8
	y1 := h / 3
	y2 := (h * 2) / 3
	cx := (w * 3) / 4
	cy := (h / 2)
	r := (x2 - x1)
	fx := cx + (r / 4)
	fy := cy + (r / 4)
	openvg.Start(width, height)
	openvg.BackgroundRGB(128, 128, 128, 1)
	openvg.FillLinearGradient(x1, y1, x2, y2, stops)
	openvg.Rect(x1, y1, x2-x1, y2-y1)
	openvg.FillRadialGradient(cx, cy, fx, fy, r, stops)
	openvg.Circle(cx, cy, r)

	openvg.FillRGB(0, 0, 0, 0.3)
	openvg.Circle(x1, y1, 10)
	openvg.Circle(x2, y2, 10)
	openvg.Circle(cx, cy, 10)
	openvg.Circle(cx+r/2, cy, 10)
	openvg.Circle(fx, fy, 10)

	openvg.FillColor("black")
	SansTypeface := "sans"
	openvg.TextMid(x1, y1-20, "(x1, y1)", SansTypeface, 18)
	openvg.TextMid(x2, y2+10, "(x2, y2)", SansTypeface, 18)
	openvg.TextMid(cx, cy, "(cx, cy)", SansTypeface, 18)
	openvg.TextMid(fx, fy, "(fx, fy)", SansTypeface, 18)
	openvg.TextEnd(cx+(r/2)+20, cy, "r", SansTypeface, 18)

	openvg.TextMid(x1+((x2-x1)/2), h/6, "Linear Gradient", SansTypeface, 36)
	openvg.TextMid(cx, h/6, "Radial Gradient", SansTypeface, 36)
	openvg.End()
}
Exemple #20
0
// textplay exercises text functions
func textplay(w, h int) {
	forlo := `For lo, the winter is past, the rain is over and gone. The flowers appear on the earth, the time for the singing of birds is come, and the voice of the turtle is heard in our land.`

	// forsince := `For since by man came death, by man came also the resurrection of the dead, for as in Adam all die, even so in Christ shall all be made alive.`

	openvg.Start(w, h)
	var (
		tw     openvg.VGfloat = 300
		begin  openvg.VGfloat = 50
		xincr  openvg.VGfloat = 400
		offset openvg.VGfloat = 100
	)
	for x, y := begin, openvg.VGfloat(h)-offset; x < openvg.VGfloat(w/2); x += xincr {
		textwrap(x, y, tw, forlo, "sans", 12, 24, 0.25, "black")
		textwrap(x, y-400, tw, forlo, "sans", 12, 24, 0.5, "black")
		tw -= offset
	}
	openvg.End()
}
Exemple #21
0
func main() {
	setOptions()
	rand.Seed(time.Now().Unix())
	w, h := openvg.Init()
	width, height := openvg.VGfloat(w), openvg.VGfloat(h)
	initParticles(width, height)
	openvg.Start(w, h)
	i := 0
	for {
		draw(width, height)
		time.Sleep(2 * time.Millisecond)
		//fmt.Printf(".")
		i++
		if alternate && i == nswitch { // switch launch direction every nswitch draws
			directionRTL = !directionRTL
			i = 0
		}
	}
}
Exemple #22
0
func face(x, y, r openvg.VGfloat, ts int) {
	var fx, fy, va openvg.VGfloat
	va = openvg.VGfloat(ts) / 2.0
	secsize := openvg.VGfloat(ts) / 3
	radius := float64(r)
	ir := radius * 1.2
	// hour display
	openvg.FillColor(digitcolor)
	openvg.StrokeColor(digitcolor)
	openvg.StrokeWidth(5)
	for h := 12; h > 0; h-- {
		t := hourangles[h%12] * deg2rad
		fx = x + openvg.VGfloat(radius*math.Cos(t))
		fy = y + openvg.VGfloat(radius*math.Sin(t))
		ix := x + openvg.VGfloat(ir*math.Cos(t))
		iy := y + openvg.VGfloat(ir*math.Sin(t))
		if showdigits {
			openvg.TextMid(fx, fy-va, hourdigits[h%12], "sans", ts)
		} else {
			openvg.Line(fx, fy, ix, iy)
		}
	}
	// second display
	openvg.FillColor(dotcolor)
	openvg.StrokeColor(dotcolor)
	openvg.StrokeWidth(2)
	re := radius * edge
	for a := 0.0; a < 360; a += 6.0 {
		t := a * deg2rad
		sx := x + openvg.VGfloat(re*math.Cos(t))
		sy := y + openvg.VGfloat(re*math.Sin(t))
		if showdots {
			openvg.Ellipse(sx, sy, secsize, secsize)
		} else {
			ix := x + openvg.VGfloat(ir*math.Cos(t))
			iy := y + openvg.VGfloat(ir*math.Sin(t))
			openvg.Line(sx, sy, ix, iy)
		}
	}
	openvg.StrokeWidth(0)

}
Exemple #23
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func main() {
	var loop = flag.Bool("loop", false, "Loop the show")
	var resize = flag.Bool("resize", false, `Resize image to fit the screen.`)
	var bgcolor = flag.String("bg", "black", `Background color (named color or rgb(r,g,b)).`)
	var delay = flag.Duration("delay", 2*time.Second, "Delay between pictures")
	flag.Usage = func() {
		fmt.Fprintf(os.Stderr, "usage: %s [ flags ] images...\n", os.Args[0])
		flag.PrintDefaults()
		os.Exit(1)
	}

	flag.Parse()
	w, h := openvg.Init()
	images := []image.Image{}
	imgcount := 0
	for _, imgfile := range flag.Args() {
		fmt.Fprintf(os.Stderr, "loading %q ", imgfile)
		img, err := getimage(imgfile, w, h, *resize)
		if err != nil {
			fmt.Fprintln(os.Stderr, err)
			continue
		}
		images = append(images, img)
		imgcount++
		fmt.Fprintln(os.Stderr, "ok")
	}
	for {
		for _, img := range images {
			ib := img.Bounds()
			imw, imh := ib.Max.X-ib.Min.X, ib.Max.Y-ib.Min.Y
			openvg.Start(w, h)
			openvg.BackgroundColor(*bgcolor)
			x, y := openvg.VGfloat(w)/2-openvg.VGfloat(imw)/2, openvg.VGfloat(h)/2-openvg.VGfloat(imh)/2
			openvg.Img(x, y, img)
			openvg.End()
			time.Sleep(*delay)
		}
		if !*loop {
			break
		}
	}
}
Exemple #24
0
// rotext draws text, rotated around the center of the screen, progressively faded
func rotext(w, h, n int, s string) {
	fade := (100.0 / openvg.VGfloat(n)) / 100.0
	deg := 360.0 / openvg.VGfloat(n)
	x := openvg.VGfloat(w) / 2.0
	y := openvg.VGfloat(h) / 2.0
	alpha := openvg.VGfloat(1.0)
	size := w / 8

	openvg.Start(w, h)
	openvg.Background(0, 0, 0)
	openvg.Translate(x, y)
	for i := 0; i < n; i++ {
		openvg.FillRGB(255, 255, 255, alpha)
		openvg.Text(0, 0, s, "serif", size)
		alpha -= fade // fade
		size += n     // enlarge
		openvg.Rotate(deg)
	}
	openvg.End()
}
Exemple #25
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// fontrange shows a range of fonts
func fontrange(w, h int) {
	var x, lx, length openvg.VGfloat
	y := openvg.VGfloat(h) / 2.0
	w2 := openvg.VGfloat(w) / 2.0
	spacing := openvg.VGfloat(50.0)
	s2 := spacing / 2.0
	sizes := []int{6, 7, 8, 9, 10, 11, 12, 14, 16, 18, 21, 24, 36, 48, 60, 72, 96}

	openvg.Start(w, h)
	openvg.Background(255, 255, 255)

	// compute the length so we can center
	length = 0.0
	for _, s := range sizes {
		length += openvg.VGfloat(s) + spacing
	}
	length -= spacing
	lx = w2 - (length / 2) // center point

	// for each size, display a character and label
	x = lx
	for _, s := range sizes {
		openvg.FillRGB(128, 0, 0, 1)
		openvg.TextMid(x, y, "a", "serif", s)
		openvg.FillRGB(128, 128, 128, 1)
		openvg.TextMid(x, y-spacing, fmt.Sprintf("%d", s), "sans", 16)
		x += openvg.VGfloat(s) + spacing
	}
	// draw a openvg.Line below the characters, a curve above
	x -= spacing
	openvg.StrokeRGB(150, 150, 150, 0.5)
	openvg.StrokeWidth(2)
	openvg.Line(lx, y-s2, x, y-s2)
	openvg.FillRGB(255, 255, 255, 1)
	openvg.Qbezier(lx, y+s2, x, y+s2, x, y+(spacing*3))
	openvg.End()
}
Exemple #26
0
func main() {
	width, height := openvg.Init() // OpenGL, etc initialization

	w2 := openvg.VGfloat(width / 2)
	h2 := openvg.VGfloat(height / 2)
	w := openvg.VGfloat(width)

	stops := []openvg.Offcolor{
		{0.0, openvg.RGB{44, 100, 232}, 1.0}, // blue-ish
		{0.5, openvg.RGB{22, 50, 151}, 1.0},  // darker blue
		{1.0, openvg.RGB{88, 200, 255}, 1.0}, // lighter blue
	}

	openvg.Start(width, height)                               // Start the picture
	openvg.BackgroundColor("black")                           // Black background
	openvg.FillRadialGradient(w2, 0, w2, w2, w*.5, stops)     // Big blue marble
	openvg.Circle(w2, 0, w)                                   // The "world"
	openvg.FillColor("white")                                 // White text
	openvg.TextMid(w2, h2, "hello, world", "serif", width/10) // Greetings
	//openvg.SaveEnd("hvg.raw")                                 // End the picture
	openvg.End()
	bufio.NewReader(os.Stdin).ReadBytes('\n') // Pause until [RETURN]
	openvg.Finish()                           // Graphics cleanup
}
Exemple #27
0
func main() {
	var nr = flag.Int("n", 500, "number of objects")
	var message = flag.String("m", "Go/OpenVG", "message")
	var bgcolor = flag.String("bg", "white", "background color")
	var fgcolor = flag.String("fg", "maroon", "text color")

	flag.Parse()
	rseed()

	width, height := openvg.Init()
	fw := openvg.VGfloat(width)
	fh := openvg.VGfloat(height)

	openvg.Start(width, height)
	openvg.BackgroundColor(*bgcolor)
	for i := 0; i < *nr; i++ {

		red := uint8(rand.Intn(255))
		green := uint8(rand.Intn(255))
		blue := uint8(rand.Intn(255))
		alpha := randf()

		x := randf() * fw
		y := randf() * fh
		radius := randf() * fw / 10

		openvg.FillRGB(red, green, blue, alpha)
		openvg.Circle(x, y, radius)
	}
	openvg.FillColor(*fgcolor)
	openvg.TextMid(fw/2, fh/2, *message, "sans", width/25)
	openvg.End()

	bufio.NewReader(os.Stdin).ReadBytes('\n')
	openvg.Finish()
}
Exemple #28
0
func imagetable(w, h int) {
	imgw, imgh := 422, 238
	itable := []it{
		{"desert0.jpg", imgw, imgh},
		{"desert1.jpg", imgw, imgh},
		{"desert2.jpg", imgw, imgh},
		{"desert3.jpg", imgw, imgh},
		{"desert4.jpg", imgw, imgh},
		{"desert5.jpg", imgw, imgh},
		{"desert6.jpg", imgw, imgh},
		{"desert7.jpg", imgw, imgh},
		//{"http://farm4.static.flickr.com/3546/3338566612_9c56bfb53e_m.jpg", 240, 164},
		//{"http://farm4.static.flickr.com/3642/3337734413_e36baba755_m.jpg", 240, 164},
	}
	offset := openvg.VGfloat(50)
	left := offset
	bot := openvg.VGfloat(h-imgh) - offset
	gutter := offset
	x := left
	y := bot
	openvg.Start(w, h)
	openvg.BackgroundColor("black")
	for _, iname := range itable {
		openvg.Image(x, y, iname.width, iname.height, iname.name)
		openvg.FillRGB(255, 255, 255, 0.3)
		openvg.Rect(x, y, openvg.VGfloat(imgw), 32)
		openvg.FillRGB(0, 0, 0, 1)
		openvg.TextMid(x+openvg.VGfloat(imgw/2), y+10, iname.name, "sans", 16)
		x += openvg.VGfloat(iname.width) + gutter
		if x > openvg.VGfloat(w) {
			x = left
			y -= openvg.VGfloat(iname.height) + gutter
		}
	}
	y = openvg.VGfloat(h) * 0.1
	openvg.FillRGB(128, 128, 128, 1)
	openvg.TextMid(openvg.VGfloat(w/2), 100, "Joshua Tree National Park", "sans", 48)
	openvg.End()
}
Exemple #29
0
// testpattern shows a test pattern
func testpattern(w, h int, s string) {
	var midx, midy1, midy2, midy3 openvg.VGfloat
	fontsize := 256
	h2 := openvg.VGfloat(h / 2)
	by := openvg.VGfloat(h - 100)
	bx := openvg.VGfloat(w - 100)
	tw1 := &FW{"mono", 0, fontsize}
	tw2 := &FW{"sans", 0, fontsize}
	tw3 := &FW{"serif", 0, fontsize}

	openvg.Start(w, h)

	// colored squares in the corners
	openvg.FillRGB(255, 0, 0, 1)
	openvg.Rect(0, 0, 100, 100)
	openvg.FillRGB(0, 255, 0, 1)
	openvg.Rect(0, by, 100, 100)
	openvg.FillRGB(0, 0, 255, 1)
	openvg.Rect(bx, 0, 100, 100)
	openvg.FillRGB(128, 128, 128, 1)
	openvg.Rect(bx, by, 100, 100)

	// for each font, (Sans, Serif, Mono), adjust the string to the w
	tw1.fitwidth(w, 20, s)
	tw2.fitwidth(w, 20, s)
	tw3.fitwidth(w, 20, s)

	midx = openvg.VGfloat(w / 2)

	// Adjust the baselines to be medial
	midy1 = h2 + 20 + openvg.VGfloat((tw1.fontsize)/2)
	midy2 = h2 - openvg.VGfloat((tw2.fontsize)/2)
	midy3 = h2 - 20 - openvg.VGfloat(tw2.fontsize) - openvg.VGfloat((tw3.fontsize)/2)

	openvg.FillRGB(128, 128, 128, 1)
	openvg.TextMid(midx, midy1, s, tw1.font, tw1.fontsize)
	openvg.FillRGB(128, 0, 0, 1)
	openvg.TextMid(midx, midy2, s, tw2.font, tw2.fontsize)
	openvg.FillRGB(0, 0, 128, 1)
	openvg.TextMid(midx, midy3, s, tw3.font, tw3.fontsize)
	openvg.End()
}
Exemple #30
0
// showgrid xrays a slide
func showgrid(d deck.Deck, n int, p float64) {
	w := openvg.VGfloat(d.Canvas.Width)
	h := openvg.VGfloat(d.Canvas.Height)
	percent := openvg.VGfloat(p)
	fs := (w / 100) // labels are 1% of the width
	xpct := (percent / 100.0) * w
	ypct := (percent / 100.0) * h

	openvg.StrokeColor("lightgray", 0.5)
	openvg.StrokeWidth(3)

	// horizontal gridlines
	xl := percent
	for x := xpct; x <= w; x += xpct {
		openvg.Line(x, 0, x, h)
		openvg.Text(x, percent, fmt.Sprintf("%.0f%%", xl), "sans", int(fs))
		xl += percent
	}

	// vertical gridlines
	yl := percent
	for y := ypct; y <= h; y += ypct {
		openvg.Line(0, y, w, y)
		openvg.Text(percent, y, fmt.Sprintf("%.0f%%", yl), "sans", int(fs))
		yl += percent
	}

	// show boundary and location of images
	if n < 0 || n > len(d.Slide) {
		return
	}
	for _, im := range d.Slide[n].Image {
		x := pct(im.Xp, w)
		y := pct(im.Yp, h)
		iw := openvg.VGfloat(im.Width)
		ih := openvg.VGfloat(im.Height)
		if im.Scale > 0 {
			iw *= openvg.VGfloat(im.Scale / 100)
			ih *= openvg.VGfloat(im.Scale / 100)
		}
		openvg.FillRGB(127, 0, 0, 0.3)
		openvg.Circle(x, y, fs)
		openvg.FillRGB(255, 0, 0, 0.1)
		openvg.Rect(x-iw/2, y-ih/2, iw, ih)
	}
	openvg.End()
}