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
}
}
}
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
}
// 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)
}
}