// imgtest draws images at the corners and center
func imagetest(w, h int) {
openvg.Start(w, h)
imgw := 422
imgh := 238
fiw := float64(imgw)
fih := float64(imgh)
fw := float64(w)
fh := float64(h)
cx := (fw / 2) - (fiw / 2)
cy := (fh / 2) - (fih / 2)
ulx := 0.0
uly := fh - fih
urx := fw - fiw
ury := uly
llx := 0.0
lly := 0.0
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()
}
// hackernews shows the top n articles from Hackernews
func (d *display) hackernews(n int) {
hdim := dimen{x: 0, y: 0, width: d.width, height: d.height / 2}
r, err := netread(HNTopURL)
if err != nil {
fmt.Fprintf(os.Stderr, "headline read error: %v\n", err)
hdim.gerror(d.bgcolor, d.textcolor, "no headlines")
return
}
var hnid HNTop
err = json.NewDecoder(r).Decode(&hnid)
if err != nil {
fmt.Fprintf(os.Stderr, "decode: %v\n", err)
hdim.gerror(d.bgcolor, d.textcolor, "no headlines")
r.Close()
return
}
r.Close()
var item HNitem
x := d.width / 2
y := d.height * 0.10
headsize := d.width / 80
spacing := headsize * 2.0
hdim.regionFill(d.bgcolor, d.textcolor)
for i := n - 1; i >= 0; i-- {
hnr, err := netread(fmt.Sprintf(HNItemfmt, hnid[i]))
if err != nil {
fmt.Fprintf(os.Stderr, "%v: getting id %d\n", err, hnid[i])
hnr.Close()
continue
}
err = json.NewDecoder(hnr).Decode(&item)
if err != nil {
fmt.Fprintf(os.Stderr, "%v: decoding id %d\n", err, hnid[i])
hnr.Close()
continue
}
openvg.TextMid(x, y, item.Title, "serif", int(headsize))
y += spacing
hnr.Close()
}
openvg.Image(d.width*0.05, 15, 32, 32, "hn.png")
openvg.End()
}
// advert is an ad for the package
func advert(w, h int) {
y := (6 * float64(h)) / 10
fontsize := (w * 4) / 100
f3 := fontsize / 3
s := "github.com/ajstarks/openvg"
a := "*****@*****.**"
imw := 110
imh := 110
midx := float64(w / 2)
openvg.Start(w, h)
openvg.FillRGB(128, 0, 0, 1)
openvg.TextMid(midx, y-float64(fontsize/4), s, "sans", fontsize)
y -= 150
openvg.FillRGB(128, 128, 128, 1)
openvg.TextMid(midx, y, a, "sans", f3)
openvg.Image(float64(w/2)-float64(imw/2), y-float64(imh*2), imw, imh, "starx.jpg")
openvg.End()
}
// nytheadlines retrieves data from the New York Times API, decodes and displays it.
func (d *display) nytheadlines(section string, thumb bool) {
hdim := dimen{x: 0, y: 0, width: d.width, height: d.height / 2}
r, err := netread(fmt.Sprintf(NYTfmt, section, NYTAPIkey))
if err != nil {
fmt.Fprintf(os.Stderr, "headline read error: %v\n", err)
hdim.gerror(d.bgcolor, d.textcolor, "no headlines")
return
}
defer r.Close()
var data NYTHeadlines
err = json.NewDecoder(r).Decode(&data)
if err != nil {
fmt.Fprintf(os.Stderr, "decode: %v\n", err)
hdim.gerror(d.bgcolor, d.textcolor, "no headlines")
return
}
x := d.width * 0.10
y := d.height * 0.10
thumbsize := int(d.height * 0.05)
hdim.regionFill(d.bgcolor, d.textcolor)
headsize := d.width / 80
spacing := openvg.VGfloat(thumbsize)
for i := len(data.Results) - 1; i >= 0; i-- {
openvg.Text(x, y, fromHTML.Replace(data.Results[i].Title), "serif", int(headsize))
if len(data.Results[i].Thumbnail) > 0 {
img, imerr := netimage(data.Results[i].Thumbnail)
if imerr != nil {
continue
}
g := gift.New()
g.Add(gift.Resize(0, thumbsize, gift.LanczosResampling))
gift.Resize(thumbsize, thumbsize, gift.BoxResampling)
resized := image.NewRGBA(g.Bounds(img.Bounds()))
g.Draw(resized, img)
openvg.Img(x-100, y-(spacing*0.25), resized)
}
y = y + spacing
}
openvg.Image(d.width*0.05, 15, 30, 30, "poweredby_nytimes_30a.png")
openvg.End()
}
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()
}
// advert is an ad for the package
func advert(w, h int) {
y := float64(h) / 4
fontsize := (w * 4) / 100
f3 := fontsize / 3
s := "github.com/ajstarks/openvg"
a := "*****@*****.**"
imw := 110
imh := 110
rw := float64(w / 4)
rh := (rw * 2) / 3
midx := float64(w / 2)
openvg.Start(w, h)
makepi(midx-float64(rw/2), float64(h/2), rw, rh)
openvg.FillRGB(128, 0, 0, 1)
openvg.TextMid(midx, y-float64(fontsize/4), s, "sans", fontsize)
y -= 100
openvg.FillRGB(128, 128, 128, 1)
openvg.TextMid(midx, y, a, "sans", f3)
openvg.Image(float64(w/2)-float64(imw/2), 20, imw, imh, "starx.jpg")
openvg.End()
}
func imagetable(w, h int) {
imgw, imgh := 422, 238
itable := []string{
"desert0.jpg",
"desert1.jpg",
"desert2.jpg",
"desert3.jpg",
"desert4.jpg",
"desert5.jpg",
"desert6.jpg",
"desert7.jpg",
}
left := 50.0
bot := float64(h-imgh) - 50.0
gutter := 50.0
x := left
y := bot
openvg.Start(w, h)
openvg.BackgroundColor("black")
for _, iname := range itable {
openvg.Image(x, y, imgw, imgh, iname)
openvg.FillRGB(255, 255, 255, 0.3)
openvg.Rect(x, y, float64(imgw), 32)
openvg.FillRGB(0, 0, 0, 1)
openvg.TextMid(x+float64(imgw/2), y+10, iname, "sans", 16)
x += float64(imgw) + gutter
if x > float64(w) {
x = left
y -= float64(imgh) + gutter
}
}
y = float64(h) * 0.1
openvg.FillRGB(128, 128, 128, 1)
openvg.TextMid(float64(w/2), 100, "Joshua Tree National Park", "sans", 48)
openvg.End()
}
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stdout,
`usage: %s [ opts ] 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()
}
var resize bool
var bg_color string
flag.BoolVar(&resize, "resize", false, `Resize image to fit the screen (using "convert" binary.`)
flag.StringVar(&bg_color, "bg-color", "",
`Background color to use with centered image, in RRGGBB (hex, e.g. "aabbcc") format.`)
flag.Parse()
if flag.NArg() != 1 {
log.Print("ERROR: Exactly one image-path argument must be specified.")
flag.Usage()
}
var r, g, b uint8
var err error
if len(bg_color) == 0 {
r, g, b = 0, 0, 0
} else if len(bg_color) == 6 {
n, err := strconv.ParseUint(bg_color[:2], 16, 8)
if err == nil {
r = uint8(n)
n, err = strconv.ParseUint(bg_color[2:4], 16, 8)
}
if err == nil {
g = uint8(n)
n, err = strconv.ParseUint(bg_color[4:6], 16, 8)
}
if err == nil {
b = uint8(n)
}
}
if err != nil {
log.Fatalf("ERROR: Failed to parse bg-color value (%v): %v", bg_color, err)
}
image_path := flag.Args()[0]
exit_code := 0
defer func() {
os.Exit(exit_code)
}()
openvg.SaveTerm()
w, h := openvg.Init()
openvg.RawTerm()
defer openvg.Finish()
defer openvg.RestoreTerm()
image_conf, err := get_image_conf(image_path)
if err == nil && resize && (image_conf.Width != w || image_conf.Height != h) {
image_path, err = resize_image(w, h, image_path)
}
if err != nil {
log.Printf("ERROR: Failed to process image (%v): %v", image_path, err)
exit_code = 1
} else {
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.Background(r, g, b)
if resize {
openvg.Image(0, 0, w, h, image_path)
} else {
x, y := openvg.VGfloat(w)/2-openvg.VGfloat(image_conf.Width)/2,
openvg.VGfloat(h)/2-openvg.VGfloat(image_conf.Height)/2
openvg.Image(x, y, image_conf.Width, image_conf.Height, image_path)
}
openvg.End()
_ = <-sig_chan
}
}
// refcard shows a reference card of shapes
func refcard(width, height int) {
shapenames := []string{
"Circle",
"Ellipse",
"Rectangle",
"Rounded Rectangle",
"Line",
"Polyline",
"Polygon",
"Arc",
"Quadratic Bezier",
"Cubic Bezier",
"Image",
}
top := float64(height) * .95
sx := float64(width) * 0.10
sy := top
sw := float64(width) * .05
sh := float64(height) * .045
dotsize := 7.0
spacing := 2.0
fontsize := int(float64(height) * .033)
shapecolor := Color{202, 225, 255, 1.0}
openvg.Start(width, height)
openvg.FillRGB(128, 0, 0, 1)
openvg.TextEnd(float64(width-20), float64(height/2),
"OpenVG on the Raspberry Pi", "sans", fontsize+(fontsize/2))
openvg.FillRGB(0, 0, 0, 1)
for _, s := range shapenames {
openvg.Text(sx+sw+sw/2, sy, s, "sans", fontsize)
sy -= sh * spacing
}
sy = top
cx := sx + (sw / 2)
ex := sx + sw
openvg.FillRGB(shapecolor.red, shapecolor.green, shapecolor.blue, shapecolor.alpha)
openvg.Circle(cx, sy, sw)
coordpoint(cx, sy, dotsize, shapecolor)
sy -= sh * spacing
openvg.Ellipse(cx, sy, sw, sh)
coordpoint(cx, sy, dotsize, shapecolor)
sy -= sh * spacing
openvg.Rect(sx, sy, sw, sh)
coordpoint(sx, sy, dotsize, shapecolor)
sy -= sh * spacing
openvg.Roundrect(sx, sy, sw, sh, 20, 20)
coordpoint(sx, sy, dotsize, shapecolor)
sy -= sh * spacing
openvg.StrokeWidth(1)
openvg.StrokeRGB(204, 204, 204, 1)
openvg.Line(sx, sy, ex, sy)
coordpoint(sx, sy, dotsize, shapecolor)
coordpoint(ex, sy, dotsize, shapecolor)
sy -= sh
px := []float64{sx, sx + (sw / 4), sx + (sw / 2), sx + ((sw * 3) / 4), sx + sw}
py := []float64{sy, sy - sh, sy, sy - sh, sy}
openvg.Polyline(px, py) // , 5)
coordpoint(px[0], py[0], dotsize, shapecolor)
coordpoint(px[1], py[1], dotsize, shapecolor)
coordpoint(px[2], py[2], dotsize, shapecolor)
coordpoint(px[3], py[3], dotsize, shapecolor)
coordpoint(px[4], py[4], dotsize, shapecolor)
sy -= sh * spacing
py[0] = sy
py[1] = sy - sh
py[2] = sy - (sh / 2)
py[3] = py[1] - (sh / 4)
py[4] = sy
openvg.Polygon(px, py) // , 5)
sy -= (sh * spacing) + sh
openvg.Arc(sx+(sw/2), sy, sw, sh, 0, 180)
coordpoint(sx+(sw/2), sy, dotsize, shapecolor)
sy -= sh * spacing
var cy, ey float64
cy = sy + (sh / 2)
ey = sy
openvg.Qbezier(sx, sy, cx, cy, ex, ey)
coordpoint(sx, sy, dotsize, shapecolor)
coordpoint(cx, cy, dotsize, shapecolor)
coordpoint(ex, ey, dotsize, shapecolor)
sy -= sh * spacing
ey = sy
cy = sy + sh
openvg.Cbezier(sx, sy, cx, cy, cx, sy, ex, ey)
coordpoint(sx, sy, dotsize, shapecolor)
coordpoint(cx, cy, dotsize, shapecolor)
coordpoint(cx, sy, dotsize, shapecolor)
coordpoint(ex, ey, dotsize, shapecolor)
sy -= (sh * spacing * 1.5)
openvg.Image(sx, sy, 110, 110, "starx.jpg")
openvg.End()
}