Exemplo n.º 1
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()
}
Exemplo n.º 2
0
func main() {
	var cy, ch, midy int
	var message []string
	message = []string{" Black", "cats", "skitter", "and", "ghouls", "patter", "Happy", "Halloween"}

	w, h := openvg.Init()
	//var speed openvg.VGfloat = 0.5
	var x openvg.VGfloat = 0
	var vw, vh openvg.VGfloat
	var midxx openvg.VGfloat = openvg.VGfloat(w / 2)
	midy = (h / 2)
	fontsize := w / 8
	//cx = 0
	ch = fontsize * 2
	//cw = w
	cy = midy - (ch / 2)
	var redness uint8
	var index int

	//rx , rw, rh := openvg.VGfloat(cx) , openvg.VGfloat(cw), openvg.VGfloat(ch)
	ry := openvg.VGfloat(cy)
	// scroll the text, only in the clipping rectangle
	index = 0
	for {
		for redness = 255; redness > 16; redness -= 2 {

			ch = fontsize * 2
			//cw = w
			cy = midy - (ch / 2)
			openvg.Start(w, h)
			openvg.Background(redness, 0, 0)
			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)
			var fsiz int
			fsiz = int(255 - redness)
			openvg.TextMid(midxx, 0, message[index], "shf", fsiz)
			openvg.ClipEnd()
			openvg.End()
		}
		index = (index + 1) % 8
		if index == 0 {
			vw = openvg.VGfloat(w) - 200
			vh = openvg.VGfloat(h) - 200
			openvg.Video(100.0, 100.0, vw, vh, "test.h264")
		}
		if index == 0 {
			var test, oix int
			var xpos [40]float32
			var ypos [40]float32
			var rotate [40]float32
			var spdx [40]float32
			var spdy [40]float32

			// Init positions
			for test = 0; test < 40; test++ {
				var rot = rand.Float32()
				var rax = rand.Float32()
				rax = float32(w) * rax
				var ray = rand.Float32()
				ray = float32(h) * ray

				spdx[test] = float32(test) * rand.Float32()
				spdy[test] = float32(test) * rand.Float32()

				ypos[test] = ray
				xpos[test] = rax
				rot = 0
				rotate[test] = rot

			}

			// Move around
			for oix = 0; oix < 100; oix++ {
				openvg.Start(w, h)
				openvg.Background(0, 0, 0)
				openvg.FillColor("red")

				for test = 0; test < 40; test++ {
					var rot = rand.Float32()
					var rax = rand.Float32()*float32(4.0) - float32(2.0)
					var ray = float32(4.0)*rand.Float32() - float32(2.0)

					spdy[test] += ray
					spdx[test] += rax

					xpos[test] = xpos[test] + spdx[test]
					ypos[test] = ypos[test] + spdy[test]
					rotate[test] = rotate[test] + float32(rot*4-2)

					openvg.Rotate(openvg.VGfloat(rotate[test]))
					openvg.Translate(openvg.VGfloat(xpos[test]), openvg.VGfloat(ypos[test]))

					openvg.TextMid(0, 0, "Happy Halloween", "shf", 30)

					openvg.Translate(-openvg.VGfloat(xpos[test]), -openvg.VGfloat(ypos[test]))
					openvg.Rotate(-openvg.VGfloat(rotate[test]))

				}
				openvg.End()
			}

		}
	}
	bufio.NewReader(os.Stdin).ReadBytes('\n')
	openvg.Finish()
	os.Exit(0)
}