func drawTypeOfTransport(x openvg.VGfloat, y openvg.VGfloat, w openvg.VGfloat, h int, tType string) {
//openvg.Background(0, 0, 255)
openvg.FillColor("blue")
switch tType {
case "METRO":
openvg.Text(x, y, "T", "sans", h)
case "BUS":
openvg.Text(x, y, "B", "sans", h)
case "TRAIN":
openvg.Text(x, y, "J", "sans", h)
case "TRAM":
openvg.Text(x, y, "S", "sans", h)
default:
openvg.Text(x, y, "D", "sans", h)
}
openvg.FillColor("black")
//openvg.Background(0, 0, 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()
}
}
}
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()
}
func roundhand(cx, cy, px, py, stroke openvg.VGfloat, color string) {
openvg.StrokeWidth(stroke)
openvg.StrokeColor(color)
openvg.Line(cx, cy, px, py)
openvg.StrokeWidth(0)
openvg.FillColor(color)
openvg.Ellipse(px, py, stroke, stroke)
}
func secondhand(cx, cy, sx, sy, textsize openvg.VGfloat) {
openvg.FillColor(secolor, 0.4)
openvg.Ellipse(sx, sy, textsize, textsize)
if secline {
openvg.StrokeWidth(textsize / 6)
openvg.StrokeColor(secolor)
openvg.Line(cx, cy, sx, sy)
openvg.StrokeWidth(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)
}
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)
}
//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()
}
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)
}
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()
}
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
}
// textwrap draws text at location, wrapping at the specified width
func textwrap(x, y, w openvg.VGfloat, s string, font string, size int, leading, factor openvg.VGfloat, color string) {
openvg.FillColor(color)
wordspacing := openvg.TextWidth("M", font, size)
words := strings.Split(s, " ")
xp := x
yp := y
edge := x + w
for i := 0; i < len(words); i++ {
tw := openvg.TextWidth(words[i], font, size)
openvg.Text(xp, yp, words[i], font, size)
xp += tw + (wordspacing * factor)
if xp > edge {
xp = x
yp -= leading
}
}
}
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()
}
// main plots data from specified files or standard input in a
// grid where plotc specifies the number of columns.
func main() {
w, h := openvg.Init()
i := 1
filenames := flag.Args()
for i <= 1000 {
openvg.Start(w, h)
openvg.FillColor("white")
openvg.Rect(0, 0, gwidth, gheight)
if len(filenames) == 0 {
doplot(beginx, beginy, "")
} else {
plotgrid(beginx, beginy, filenames)
}
openvg.End()
i = i + 1
}
bufio.NewReader(os.Stdin).ReadByte()
openvg.Finish()
}
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
}
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()
}
// plot places a plot at the specified location with the specified dimemsions
// using the specified settings, using the specified data
func plot(x, y, w, h openvg.VGfloat, settings plotset, d []rawdata) {
nd := len(d)
if nd < 2 {
fmt.Fprintf(os.Stderr, "%d is not enough points to plot\n", len(d))
return
}
// Compute the minima and maxima of the data
maxx, minx := d[0].x, d[0].x
maxy, miny := d[0].y, d[0].y
for _, v := range d {
if v.x > maxx {
maxx = v.x
}
if v.y > maxy {
maxy = v.y
}
if v.x < minx {
minx = v.x
}
if v.y < miny {
miny = v.y
}
}
// Prepare for a area or line chart by allocating
// polygon coordinates; for the horizon plot, you need two extra coordinates
// for the extrema.
needpoly := settings.opt["area"] || settings.opt["connect"]
var xpoly, ypoly []openvg.VGfloat
if needpoly {
xpoly = make([]openvg.VGfloat, nd+2)
ypoly = make([]openvg.VGfloat, nd+2)
// preload the extrema of the polygon,
// the bottom left and bottom right of the plot's rectangle
xpoly[0] = x
ypoly[0] = y
xpoly[nd+1] = x + w
ypoly[nd+1] = y
}
// Draw the plot's bounding rectangle
if settings.opt["showbg"] && !settings.opt["sameplot"] {
openvg.FillColor(settings.attr["bgcolor"])
openvg.Rect(x, y, w, h)
}
// Loop through the data, drawing items as specified
spacer := openvg.VGfloat(10.0)
for i, v := range d {
xp := fmap(v.x, minx, maxx, x, x+w)
yp := fmap(v.y, miny, maxy, y, y+h)
if needpoly {
xpoly[i+1] = xp
ypoly[i+1] = yp
}
if settings.opt["showbar"] {
openvg.StrokeColor(settings.attr["barcolor"])
openvg.StrokeWidth(settings.size["barsize"])
openvg.Line(xp, yp, xp, y)
}
if settings.opt["showdot"] {
openvg.FillColor(settings.attr["dotcolor"])
openvg.StrokeWidth(0)
openvg.Circle(xp, yp, settings.size["dotsize"])
}
if settings.opt["showx"] {
if i%int(settings.size["xinterval"]) == 0 {
openvg.FillColor("black")
openvg.TextMid(xp, y-(spacer*2), fmt.Sprintf("%d", int(v.x)), settings.attr["font"], int(settings.size["fontsize"]))
openvg.StrokeColor("silver")
openvg.StrokeWidth(1)
openvg.Line(xp, y, xp, y-spacer)
}
openvg.StrokeWidth(0)
}
}
// Done constructing the points for the area or line plots, display them in one shot
if settings.opt["area"] {
openvg.FillColor(settings.attr["areacolor"])
openvg.Polygon(xpoly, ypoly)
}
if settings.opt["connect"] {
openvg.StrokeColor(settings.attr["linecolor"])
openvg.StrokeWidth(settings.size["linesize"])
openvg.Polyline(xpoly[1:nd+1], ypoly[1:nd+1])
}
// Put on the y axis labels, if specified
if settings.opt["showy"] {
bot := openvg.VGfloat(math.Floor(float64(miny)))
top := openvg.VGfloat(math.Ceil(float64(maxy)))
yrange := top - bot
interval := yrange / openvg.VGfloat(settings.size["yinterval"])
for yax := bot; yax <= top; yax += interval {
yaxp := fmap(yax, bot, top, openvg.VGfloat(y), openvg.VGfloat(y+h))
openvg.FillColor("black")
openvg.TextEnd(x-spacer, yaxp, fmt.Sprintf("%.1f", yax), settings.attr["font"], int(settings.size["fontsize"]))
openvg.StrokeColor("silver")
openvg.StrokeWidth(1)
openvg.Line(x-spacer, yaxp, x, yaxp)
}
openvg.StrokeWidth(0)
}
// Finally, tack on the label, if specified
if len(settings.attr["label"]) > 0 {
openvg.FillColor(settings.attr["labelcolor"], 0.3)
openvg.TextMid(x+(w/2), y+(h/2), settings.attr["label"], settings.attr["font"], int(w/8)) // int(settings.size["fontsize"]))
}
openvg.StrokeWidth(0)
}
// interact controls the display of the deck
func interact(filename, searchterm string, w, h, slidenum int, gp float64) {
openvg.SaveTerm()
defer openvg.RestoreTerm()
var d deck.Deck
var err error
d, err = deck.Read(filename, w, h)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return
}
openvg.RawTerm()
r := bufio.NewReader(os.Stdin)
lastslide := len(d.Slide) - 1
if slidenum > lastslide {
slidenum = lastslide
}
if slidenum < 0 {
slidenum = 0
}
if len(searchterm) > 0 {
sr := deck.Search(d, searchterm)
if sr >= 0 {
slidenum = sr
}
}
n := slidenum
xray := 1
initial := 0
imap := make(map[string]image.Image)
// respond to keyboard commands, 'q' to exit
for cmd := byte('0'); cmd != 'q'; cmd = readcmd(r) {
switch cmd {
// read/reload
case 'r', 18: // r, Ctrl-R
d, err = deck.Read(filename, w, h)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return
}
loadimage(d, imap)
openvg.Background(0, 0, 0)
xray = 1
showslide(d, imap, n)
// save slide
case 's', 19: // s, Ctrl-S
openvg.SaveEnd(fmt.Sprintf("%s-slide-%04d", filename, n))
// first slide
case '0', '1', 1, '^': // 0,1,Ctrl-A,^
initial++
if initial == 1 {
loadimage(d, imap)
n = slidenum
} else {
n = 0
}
showslide(d, imap, n)
// last slide
case '*', 5, '$': // *, Crtl-E, $
n = lastslide
showslide(d, imap, n)
// next slide
case '+', 'n', '\n', ' ', '\t', '=', 14: // +,n,newline,space,tab,equal,Crtl-N
n++
if n > lastslide {
n = 0
}
showslide(d, imap, n)
// previous slide
case '-', 'p', 8, 16, 127: // -,p,Backspace,Ctrl-P,Del
n--
if n < 0 {
n = lastslide
}
showslide(d, imap, n)
// x-ray
case 'x', 24: // x, Ctrl-X
xray++
showslide(d, imap, n)
if xray%2 == 0 {
showgrid(d, n, gp)
}
// Escape sequence from remotes
case 27:
remote, rerr := r.ReadString('~')
if len(remote) > 2 && rerr == nil {
switch remote[1] {
case '3': // blank screen
openvg.Start(d.Canvas.Width, d.Canvas.Height)
openvg.FillColor("black")
openvg.Rect(0, 0, openvg.VGfloat(d.Canvas.Width), openvg.VGfloat(d.Canvas.Height))
openvg.End()
case '5': // back
n--
if n < 0 {
n = lastslide
}
showslide(d, imap, n)
case '6': // forward
n++
if n > lastslide {
n = 0
}
showslide(d, imap, n)
}
}
// search
case '/', 6: // slash, Ctrl-F
openvg.RestoreTerm()
searchterm, serr := r.ReadString('\n')
openvg.RawTerm()
if serr != nil {
continue
}
if len(searchterm) > 2 {
ns := deck.Search(d, searchterm[0:len(searchterm)-1])
if ns >= 0 {
showslide(d, imap, ns)
n = ns
}
}
}
}
}
// showlide displays slides
func showslide(d deck.Deck, imap map[string]image.Image, n int) {
var video videoType
if n < 0 || n > len(d.Slide)-1 {
return
}
slide := d.Slide[n]
if slide.Bg == "" {
slide.Bg = "white"
}
if slide.Fg == "" {
slide.Fg = "black"
}
openvg.Start(d.Canvas.Width, d.Canvas.Height)
cw := openvg.VGfloat(d.Canvas.Width)
ch := openvg.VGfloat(d.Canvas.Height)
if slide.Gradcolor1 != "" && slide.Gradcolor2 != "" {
oc := []openvg.Offcolor{
{0, openvg.Colorlookup(slide.Gradcolor1), 1},
{1, openvg.Colorlookup(slide.Gradcolor2), 1},
}
openvg.FillLinearGradient(0, ch, 0, 0, oc)
} else {
openvg.FillColor(slide.Bg)
}
openvg.Rect(0, 0, cw, ch)
var x, y, fs openvg.VGfloat
// every image in the slide
for _, im := range slide.Image {
x = pct(im.Xp, cw)
y = pct(im.Yp, ch)
imw := openvg.VGfloat(im.Width)
imh := openvg.VGfloat(im.Height)
if im.Scale > 0 {
imw *= openvg.VGfloat(im.Scale / 100)
imh *= openvg.VGfloat(im.Scale / 100)
}
midx := openvg.VGfloat(imw / 2)
midy := openvg.VGfloat(imh / 2)
if im.Type == "video" {
// Only one video per slide supported
video.name = im.Name
video.x = x - midx
video.y = y - midy
video.w = imw
video.h = imh
video.altimg = im.Link
} else {
img, ok := imap[im.Name]
if ok {
openvg.Img(x-midx, y-midy, img)
}
if len(im.Caption) > 0 {
capfs := pctwidth(im.Sp, cw, cw/100)
if im.Font == "" {
im.Font = "sans"
}
if im.Color == "" {
openvg.FillColor(slide.Fg)
} else {
openvg.FillColor(im.Color)
}
if im.Align == "" {
im.Align = "center"
}
switch im.Align {
case "left", "start":
x -= midx
case "right", "end":
x += midx
}
showtext(x, y-((midy)+(capfs*2.0)), im.Caption, im.Align, im.Font, capfs)
}
}
}
// every graphic on the slide
const defaultColor = "rgb(127,127,127)"
const defaultSw = 1.5
var strokeopacity float64
// line
for _, line := range slide.Line {
if line.Color == "" {
line.Color = slide.Fg // defaultColor
}
if line.Opacity == 0 {
strokeopacity = 1
} else {
strokeopacity = line.Opacity / 100.0
}
x1, y1, sw := dimen(d, line.Xp1, line.Yp1, line.Sp)
x2, y2, _ := dimen(d, line.Xp2, line.Yp2, 0)
openvg.StrokeColor(line.Color, openvg.VGfloat(strokeopacity))
if sw == 0 {
sw = defaultSw
}
openvg.StrokeWidth(openvg.VGfloat(sw))
openvg.StrokeColor(line.Color)
openvg.Line(x1, y1, x2, y2)
openvg.StrokeWidth(0)
}
// ellipse
for _, ellipse := range slide.Ellipse {
x, y, _ = dimen(d, ellipse.Xp, ellipse.Yp, 0)
var w, h openvg.VGfloat
w = pct(ellipse.Wp, cw)
if ellipse.Hr == 0 { // if relative height not specified, base height on overall height
h = pct(ellipse.Hp, ch)
} else {
h = pct(ellipse.Hr, w)
}
if ellipse.Color == "" {
ellipse.Color = defaultColor
}
if ellipse.Opacity == 0 {
ellipse.Opacity = 1
} else {
ellipse.Opacity /= 100
}
openvg.FillColor(ellipse.Color, openvg.VGfloat(ellipse.Opacity))
openvg.Ellipse(x, y, w, h)
}
// rect
for _, rect := range slide.Rect {
x, y, _ = dimen(d, rect.Xp, rect.Yp, 0)
var w, h openvg.VGfloat
w = pct(rect.Wp, cw)
if rect.Hr == 0 { // if relative height not specified, base height on overall height
h = pct(rect.Hp, ch)
} else {
h = pct(rect.Hr, w)
}
if rect.Color == "" {
rect.Color = defaultColor
}
if rect.Opacity == 0 {
rect.Opacity = 1
} else {
rect.Opacity /= 100
}
openvg.FillColor(rect.Color, openvg.VGfloat(rect.Opacity))
openvg.Rect(x-(w/2), y-(h/2), w, h)
}
// curve
for _, curve := range slide.Curve {
if curve.Color == "" {
curve.Color = defaultColor
}
if curve.Opacity == 0 {
strokeopacity = 1
} else {
strokeopacity = curve.Opacity / 100.0
}
x1, y1, sw := dimen(d, curve.Xp1, curve.Yp1, curve.Sp)
x2, y2, _ := dimen(d, curve.Xp2, curve.Yp2, 0)
x3, y3, _ := dimen(d, curve.Xp3, curve.Yp3, 0)
openvg.StrokeColor(curve.Color, openvg.VGfloat(strokeopacity))
openvg.FillColor(slide.Bg, openvg.VGfloat(curve.Opacity))
if sw == 0 {
sw = defaultSw
}
openvg.StrokeWidth(sw)
openvg.Qbezier(x1, y1, x2, y2, x3, y3)
openvg.StrokeWidth(0)
}
// arc
for _, arc := range slide.Arc {
if arc.Color == "" {
arc.Color = defaultColor
}
if arc.Opacity == 0 {
strokeopacity = 1
} else {
strokeopacity = arc.Opacity / 100.0
}
ax, ay, sw := dimen(d, arc.Xp, arc.Yp, arc.Sp)
w := pct(arc.Wp, cw)
h := pct(arc.Hp, cw)
openvg.StrokeColor(arc.Color, openvg.VGfloat(strokeopacity))
openvg.FillColor(slide.Bg, openvg.VGfloat(arc.Opacity))
if sw == 0 {
sw = defaultSw
}
openvg.StrokeWidth(sw)
openvg.Arc(ax, ay, w, h, openvg.VGfloat(arc.A1), openvg.VGfloat(arc.A2))
openvg.StrokeWidth(0)
}
// polygon
for _, poly := range slide.Polygon {
if poly.Color == "" {
poly.Color = defaultColor
}
if poly.Opacity == 0 {
poly.Opacity = 1
} else {
poly.Opacity /= 100
}
xs := strings.Split(poly.XC, " ")
ys := strings.Split(poly.YC, " ")
if len(xs) != len(ys) {
continue
}
if len(xs) < 3 || len(ys) < 3 {
continue
}
px := make([]openvg.VGfloat, len(xs))
py := make([]openvg.VGfloat, len(ys))
for i := 0; i < len(xs); i++ {
x, err := strconv.ParseFloat(xs[i], 32)
if err != nil {
px[i] = 0
} else {
px[i] = pct(x, cw)
}
y, err := strconv.ParseFloat(ys[i], 32)
if err != nil {
py[i] = 0
} else {
py[i] = pct(y, ch)
}
}
openvg.FillColor(poly.Color, openvg.VGfloat(poly.Opacity))
openvg.Polygon(px, py)
}
openvg.FillColor(slide.Fg)
// every list in the slide
var offset, textopacity openvg.VGfloat
const blinespacing = 2.4
for _, l := range slide.List {
if l.Font == "" {
l.Font = "sans"
}
x, y, fs = dimen(d, l.Xp, l.Yp, l.Sp)
if l.Type == "bullet" {
offset = 1.2 * fs
} else {
offset = 0
}
if l.Lp == 0 {
l.Lp = blinespacing
}
if l.Opacity == 0 {
textopacity = 1
} else {
textopacity = openvg.VGfloat(l.Opacity / 100)
}
// every list item
var li, lifont string
for ln, tl := range l.Li {
if len(l.Color) > 0 {
openvg.FillColor(l.Color, textopacity)
} else {
openvg.FillColor(slide.Fg)
}
if l.Type == "bullet" {
boffset := fs / 2
openvg.Ellipse(x, y+boffset, boffset, boffset)
//openvg.Rect(x, y+boffset/2, boffset, boffset)
}
if l.Type == "number" {
li = fmt.Sprintf("%d. ", ln+1) + tl.ListText
} else {
li = tl.ListText
}
if len(tl.Color) > 0 {
openvg.FillColor(tl.Color, textopacity)
}
if len(tl.Font) > 0 {
lifont = tl.Font
} else {
lifont = l.Font
}
showtext(x+offset, y, li, l.Align, lifont, fs)
y -= fs * openvg.VGfloat(l.Lp)
}
}
openvg.FillColor(slide.Fg)
// every text in the slide
const linespacing = 1.8
var tdata string
for _, t := range slide.Text {
if t.File != "" {
tdata = includefile(t.File)
} else {
tdata = t.Tdata
}
if t.Font == "" {
t.Font = "sans"
}
if t.Opacity == 0 {
textopacity = 1
} else {
textopacity = openvg.VGfloat(t.Opacity / 100)
}
if t.Lp == 0 {
t.Lp = linespacing
}
x, y, fs = dimen(d, t.Xp, t.Yp, t.Sp)
td := strings.Split(tdata, "\n")
if t.Type == "code" {
ls := fs * openvg.VGfloat(t.Lp)
t.Font = "mono"
tdepth := (ls * openvg.VGfloat(len(td))) + fs
openvg.FillColor("rgb(240,240,240)")
openvg.Rect(x-20, y-tdepth+(ls), pctwidth(t.Wp, cw, cw-x-20), tdepth)
}
if t.Color == "" {
openvg.FillColor(slide.Fg, textopacity)
} else {
openvg.FillColor(t.Color, textopacity)
}
if t.Type == "block" {
textwrap(x, y, pctwidth(t.Wp, cw, cw/2), tdata, t.Font, fs, fs*openvg.VGfloat(t.Lp), 0.3)
} else {
// every text line
ls := fs * openvg.VGfloat(t.Lp)
for _, txt := range td {
showtext(x, y, txt, t.Align, t.Font, fs)
y -= ls
}
}
}
openvg.FillColor(slide.Fg)
openvg.End()
if video.altimg != "" {
img, ok := imap[video.altimg]
if ok {
openvg.Img(video.x, video.y, img)
}
}
if video.name != "" {
openvg.Video(video.x, video.y, video.w, video.h, video.name)
}
}
func main() {
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 fgcolor = flag.String("fg", "white", "text color (named color or rgb(r,g,b)).")
var title = flag.String("t", "", "text annotation")
var fontsize = flag.Float64("fp", 2.0, "fontsize %")
var px = flag.Float64("px", 50, "x position %")
var py = flag.Float64("py", 50, "y position %")
var texty = flag.Float64("ty", 0, "text y %")
var exit_code int
defer func() {
os.Exit(exit_code)
}()
flag.Usage = func() {
fmt.Fprintf(os.Stderr, `usage: %s [ flags ] image-path
Set specified image as an overlay screen via OpenVG lib.
Default is to put this image to the center.
`, os.Args[0])
flag.PrintDefaults()
exit_code = 1
return
}
flag.Parse()
if flag.NArg() != 1 {
fmt.Fprintf(os.Stderr, "Exactly one image-path argument must be specified.\n")
flag.Usage()
exit_code = 2
return
}
openvg.SaveTerm()
w, h := openvg.Init()
openvg.RawTerm()
defer openvg.Finish()
defer openvg.RestoreTerm()
img, err := getimage(flag.Args()[0], w, h, *resize)
if err != nil {
exit_code = 3
return
}
ib := img.Bounds()
imw, imh := ib.Max.X-ib.Min.X, ib.Max.Y-ib.Min.Y
sig_chan := make(chan os.Signal, 1)
signal.Notify(sig_chan, os.Interrupt, os.Kill, syscall.SIGHUP, syscall.SIGTERM, syscall.SIGALRM)
openvg.Start(w, h)
openvg.BackgroundColor(*bgcolor)
var x, y openvg.VGfloat
if *px < 0 || *px > 100 {
x = openvg.VGfloat(w)/2 - openvg.VGfloat(imw)/2
} else {
x = openvg.VGfloat(w)*openvg.VGfloat(*px/100) - openvg.VGfloat(imw)/2
}
if *py < 0 || *py > 100 {
y = openvg.VGfloat(h)/2 - openvg.VGfloat(imh)/2
} else {
y = openvg.VGfloat(h)*openvg.VGfloat(*py/100) - openvg.VGfloat(imh)/2
}
openvg.Img(x, y, img)
if len(*title) > 0 {
var typ openvg.VGfloat
fs := openvg.VGfloat(*fontsize/100.0) * openvg.VGfloat(w)
if *texty == 0 {
typ = y - fs*1.5
} else {
typ = openvg.VGfloat(h) * openvg.VGfloat(*texty/100)
}
openvg.FillColor(*fgcolor)
openvg.TextMid(x+openvg.VGfloat(imw)/2, typ, *title, "sans", int(fs))
}
openvg.End()
_ = <-sig_chan
}
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)
}
func frame(cx, cy, framesize, facesize, textsize openvg.VGfloat, framecolor, facecolor string) {
openvg.FillColor(framecolor)
openvg.Roundrect(cx-framesize/2, cy-framesize/2, framesize, framesize, textsize, textsize)
openvg.FillColor(facecolor)
openvg.Ellipse(cx, cy, facesize*2.4, facesize*2.4)
}
func main() {
var (
filename = flag.String("f", "svgcolors.txt", "input file")
fontname = flag.String("font", "sans", "fontname")
neg = flag.Bool("neg", false, "negative")
showrgb = flag.Bool("rgb", false, "show RGB")
showcode = flag.Bool("showcode", true, "show colors and codes")
circsw = flag.Bool("circle", true, "circle swatch")
outline = flag.Bool("outline", false, "outline swatch")
fontsize = flag.Int("fs", 12, "fontsize")
rowsize = flag.Int("r", 32, "rowsize")
colw = flag.Float64("c", 340, "column size")
swatch = flag.Float64("s", 16, "swatch size")
gutter = flag.Float64("g", 12, "gutter")
err error
tcolor, line string
)
flag.Parse()
f, oerr := os.Open(*filename)
if oerr != nil {
fmt.Fprintf(os.Stderr, "%v\n", oerr)
return
}
width, height := openvg.Init()
openvg.Start(width, height)
fw := openvg.VGfloat(width)
fh := openvg.VGfloat(height)
if *neg {
openvg.FillColor("black")
openvg.Rect(0, 0, fw, fh)
tcolor = "white"
} else {
openvg.FillColor("white")
openvg.Rect(0, 0, fw, fh)
tcolor = "black"
}
top := fh - 32.0
left := openvg.VGfloat(32.0)
cw := openvg.VGfloat(*colw)
sw := openvg.VGfloat(*swatch)
g := openvg.VGfloat(*gutter)
in := bufio.NewReader(f)
for x, y, nr := left, top, 0; err == nil; nr++ {
line, err = in.ReadString('\n')
fields := strings.Split(strings.TrimSpace(line), "\t")
if nr%*rowsize == 0 && nr > 0 {
x += cw
y = top
}
if len(fields) == 3 {
var red, green, blue uint8
fmt.Sscanf(fields[2], "%d,%d,%d", &red, &green, &blue)
openvg.FillRGB(red, green, blue, 1)
if *outline {
openvg.StrokeColor("black")
openvg.StrokeWidth(1)
}
if *circsw {
openvg.Circle(x+sw/2, y+sw/2, sw)
} else {
openvg.Rect(x, y, sw, sw)
}
openvg.StrokeWidth(0)
openvg.FillColor(tcolor)
openvg.Text(x+sw+openvg.VGfloat(*fontsize/2), y, fields[0], *fontname, *fontsize)
var label string
if *showcode {
if *showrgb {
label = fields[1]
} else {
label = fields[2]
}
openvg.FillColor("gray")
openvg.TextEnd(x+cw-(sw+g), y, label, *fontname, *fontsize)
}
}
y -= (sw + g)
}
openvg.End()
bufio.NewReader(os.Stdin).ReadBytes('\n')
openvg.Finish()
}
func centerdot(cx, cy, size openvg.VGfloat) {
openvg.FillColor(centercolor)
openvg.Ellipse(cx, cy, size, size)
}