/**
* Create a new Graphic context from an image
*/
func NewGraphicContext(img draw.Image) *ImageGraphicContext {
var painter Painter
switch selectImage := img.(type) {
case *image.RGBA:
painter = raster.NewRGBAPainter(selectImage)
//case *image.NRGBA:
// painter = NewNRGBAPainter(selectImage)
default:
panic("Image type not supported")
}
width, height := img.Bounds().Dx(), img.Bounds().Dy()
dpi := 92
ftContext := freetype.NewContext()
ftContext.SetDPI(dpi)
ftContext.SetClip(img.Bounds())
ftContext.SetDst(img)
gc := &ImageGraphicContext{
NewStackGraphicContext(),
img,
painter,
raster.NewRasterizer(width, height),
raster.NewRasterizer(width, height),
ftContext,
dpi,
}
return gc
}
func TestFreetypeNonZeroWinding(t *testing.T) {
var p Path
p.LineTo(10, 190)
c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
c.Segment(&p, flatteningThreshold)
poly := Polygon(p.points)
color := color.RGBA{0, 0, 0, 0xff}
img := image.NewRGBA(image.Rect(0, 0, 200, 200))
rasterizer := raster.NewRasterizer(200, 200)
rasterizer.UseNonZeroWinding = true
rasterizer.Start(raster.Point{
X: raster.Fix32(10 * 256),
Y: raster.Fix32(190 * 256)})
for j := 0; j < len(poly); j = j + 2 {
rasterizer.Add1(raster.Point{
X: raster.Fix32(poly[j] * 256),
Y: raster.Fix32(poly[j+1] * 256)})
}
painter := raster.NewRGBAPainter(img)
painter.SetColor(color)
rasterizer.Rasterize(painter)
savepng("../output/raster/TestFreetypeNonZeroWinding.png", img)
}
func BenchmarkFreetype(b *testing.B) {
var p Path
p.LineTo(10, 190)
c := curve.CubicCurveFloat64{10, 190, 10, 10, 190, 10, 190, 190}
c.Segment(&p, flatteningThreshold)
poly := Polygon(p.points)
color := color.RGBA{0, 0, 0, 0xff}
for i := 0; i < b.N; i++ {
img := image.NewRGBA(image.Rect(0, 0, 200, 200))
rasterizer := raster.NewRasterizer(200, 200)
rasterizer.UseNonZeroWinding = false
rasterizer.Start(raster.Point{
X: raster.Fix32(10 * 256),
Y: raster.Fix32(190 * 256)})
for j := 0; j < len(poly); j = j + 2 {
rasterizer.Add1(raster.Point{
X: raster.Fix32(poly[j] * 256),
Y: raster.Fix32(poly[j+1] * 256)})
}
painter := raster.NewRGBAPainter(img)
painter.SetColor(color)
rasterizer.Rasterize(painter)
}
}
func TestFreetypeRasterizerNonZeroWinding(t *testing.T) {
var p Path
p.LineTo(10, 190)
draw2dbase.TraceCubic(&p, []float64{10, 190, 10, 10, 190, 10, 190, 190}, 0.5)
poly := Polygon(p.points)
color := color.RGBA{0, 0, 0, 0xff}
img := image.NewRGBA(image.Rect(0, 0, 200, 200))
rasterizer := raster.NewRasterizer(200, 200)
rasterizer.UseNonZeroWinding = true
rasterizer.Start(raster.Point{
X: raster.Fix32(10 * 256),
Y: raster.Fix32(190 * 256)})
for j := 0; j < len(poly); j = j + 2 {
rasterizer.Add1(raster.Point{
X: raster.Fix32(poly[j] * 256),
Y: raster.Fix32(poly[j+1] * 256)})
}
painter := raster.NewRGBAPainter(img)
painter.SetColor(color)
rasterizer.Rasterize(painter)
err := draw2dimg.SaveToPngFile("output/TestFreetypeRasterizerNonZeroWinding.png", img)
if err != nil {
fmt.Println(err)
}
}
func BenchmarkFreetypeNonZeroWinding(b *testing.B) {
var p Path
p.LineTo(10, 190)
draw2dbase.TraceCubic(&p, []float64{10, 190, 10, 10, 190, 10, 190, 190}, 0.5)
poly := Polygon(p.points)
color := color.RGBA{0, 0, 0, 0xff}
for i := 0; i < b.N; i++ {
img := image.NewRGBA(image.Rect(0, 0, 200, 200))
rasterizer := raster.NewRasterizer(200, 200)
rasterizer.UseNonZeroWinding = true
rasterizer.Start(raster.Point{
X: raster.Fix32(10 * 256),
Y: raster.Fix32(190 * 256)})
for j := 0; j < len(poly); j = j + 2 {
rasterizer.Add1(raster.Point{
X: raster.Fix32(poly[j] * 256),
Y: raster.Fix32(poly[j+1] * 256)})
}
painter := raster.NewRGBAPainter(img)
painter.SetColor(color)
rasterizer.Rasterize(painter)
}
}
// NewGraphicContext creates a new Graphic context from an image.
func NewGraphicContext(img draw.Image) *ImageGraphicContext {
var painter Painter
switch selectImage := img.(type) {
case *image.RGBA:
painter = raster.NewRGBAPainter(selectImage)
default:
panic("Image type not supported")
}
return NewGraphicContextWithPainter(img, painter)
}
// Make a new canvas of size w x h.
func NewCanvas(w, h int) *Canvas {
c := new(Canvas)
c.RGBA = image.NewRGBA(image.Rect(0, 0, w, h))
c.Clear(color.White)
c.painter = raster.NewRGBAPainter(c.RGBA)
c.rasterizer = raster.NewRasterizer(w, h)
c.rasterizer.UseNonZeroWinding = true
c.SetColor(color.Black)
c.path = make(raster.Path, 0, 100)
c.resetPath()
c.SetStroke(1, Round)
return c
}
// moustache draws a moustache of the specified size and droop
// onto the image m and returns the result. It may overwrite the
// original.
func moustache(m image.Image, x, y, size, droopFactor int) image.Image {
mrgba := rgba(m)
p := raster.NewRGBAPainter(mrgba)
p.SetColor(color.RGBA{0, 0, 0, 255})
w, h := m.Bounds().Dx(), m.Bounds().Dy()
r := raster.NewRasterizer(w, h)
var (
mag = raster.Fix32((10 + size) << 8)
width = pt(20, 0).Mul(mag)
mid = pt(x, y)
droop = pt(0, droopFactor).Mul(mag)
left = mid.Sub(width).Add(droop)
right = mid.Add(width).Add(droop)
bow = pt(0, 5).Mul(mag).Sub(droop)
curlx = pt(10, 0).Mul(mag)
curly = pt(0, 2).Mul(mag)
risex = pt(2, 0).Mul(mag)
risey = pt(0, 5).Mul(mag)
)
r.Start(left)
r.Add3(
mid.Sub(curlx).Add(curly),
mid.Sub(risex).Sub(risey),
mid,
)
r.Add3(
mid.Add(risex).Sub(risey),
mid.Add(curlx).Add(curly),
right,
)
r.Add2(
mid.Add(bow),
left,
)
r.Rasterize(p)
return mrgba
}
// NewPainter returns a Painter that will draw from src onto
// dst using the Porter-Duff composition operator op.
func NewPainter(dst draw.Image, src image.Image, op draw.Op) (p raster.Painter) {
defer func() { fmt.Printf("newpainter %T\n", p) }()
if src, ok := src.(*image.Uniform); ok {
switch dst := dst.(type) {
case *image.Alpha:
if _, _, _, a := src.RGBA(); a == 0xffff {
switch op {
case draw.Src:
return &raster.AlphaSrcPainter{dst}
case draw.Over:
return &raster.AlphaOverPainter{dst}
}
}
case *image.RGBA:
p := raster.NewRGBAPainter(dst)
p.SetColor(src)
p.Op = op
return p
}
}
return &genericImagePainter{dst, src, op}
}
// the returned zoneOfColor always has A == 256.
func worldImage(t *testing.T) (im *image.RGBA, zoneOfColor map[color.RGBA]string) {
scale := *flagScale
width := int(scale * 360)
height := int(scale * 180)
im = image.NewRGBA(image.Rect(0, 0, width, height))
zoneOfColor = map[color.RGBA]string{}
tab := crc32.MakeTable(crc32.IEEE + 1)
drawPoly := func(col color.RGBA, xys ...int) {
painter := raster.NewRGBAPainter(im)
painter.SetColor(col)
r := raster.NewRasterizer(width, height)
r.Start(raster.Point{X: raster.Fix32(xys[0]) << 8, Y: raster.Fix32(xys[1]) << 8})
for i := 2; i < len(xys); i += 2 {
r.Add1(raster.Point{X: raster.Fix32(xys[i]) << 8, Y: raster.Fix32(xys[i+1]) << 8})
}
r.Add1(raster.Point{X: raster.Fix32(xys[0]) << 8, Y: raster.Fix32(xys[1]) << 8})
r.Rasterize(raster.NewMonochromePainter(painter))
}
sr, err := shp.Open("world/tz_world.shp")
if err != nil {
t.Fatalf("Error opening world/tz_world.shp: %v; unzip it from http://efele.net/maps/tz/world/tz_world.zip", err)
}
defer sr.Close()
for sr.Next() {
i, s := sr.Shape()
p, ok := s.(*shp.Polygon)
if !ok {
t.Fatalf("Unknown shape %T", p)
}
zoneName := sr.ReadAttribute(i, 0)
if zoneName == "uninhabited" {
continue
}
if _, err := time.LoadLocation(zoneName); err != nil {
t.Fatalf("Failed to load: %v (%v)", zoneName, err)
}
hash := crc32.Checksum([]byte(zoneName), tab)
col := color.RGBA{uint8(hash >> 24), uint8(hash >> 16), uint8(hash >> 8), 255}
if name, ok := zoneOfColor[col]; ok {
if name != zoneName {
log.Fatalf("Color %+v dup: %s and %s", col, name, zoneName)
}
} else {
zoneOfColor[col] = zoneName
}
var xys []int
for _, pt := range p.Points {
xys = append(xys, int((pt.X+180)*scale), int((90-pt.Y)*scale))
}
drawPoly(col, xys...)
}
// adjust point from scale 32 to whatever the user is using.
ap := func(x int) int { return x * int(scale) / 32 }
// Fix some rendering glitches:
// {186 205 234 255} = Europe/Rome
drawPoly(color.RGBA{186, 205, 234, 255},
ap(6156), ap(1468),
ap(6293), ap(1596),
ap(6293), ap(1598),
ap(6156), ap(1540))
// {136 136 180 255} = America/Boise
drawPoly(color.RGBA{136, 136, 180, 255},
ap(2145), ap(1468),
ap(2189), ap(1468),
ap(2189), ap(1536),
ap(2145), ap(1536))
// {120 247 14 255} = America/Denver
drawPoly(color.RGBA{120, 247, 14, 255},
ap(2167), ap(1536),
ap(2171), ap(1536),
ap(2217), ap(1714),
ap(2204), ap(1724),
ap(2160), ap(1537))
return
}
func main() {
const (
n = 17
r = 256 * 80
)
s := raster.Fix32(r * math.Sqrt(2) / 2)
t := raster.Fix32(r * math.Tan(math.Pi/8))
m := image.NewRGBA(image.Rect(0, 0, 800, 600))
draw.Draw(m, m.Bounds(), image.NewUniform(color.RGBA{63, 63, 63, 255}), image.ZP, draw.Src)
mp := raster.NewRGBAPainter(m)
mp.SetColor(image.Black)
z := raster.NewRasterizer(800, 600)
for i := 0; i < n; i++ {
cx := raster.Fix32(25600 + 51200*(i%4))
cy := raster.Fix32(2560 + 32000*(i/4))
c := raster.Point{X: cx, Y: cy}
theta := math.Pi * (0.5 + 0.5*float64(i)/(n-1))
dx := raster.Fix32(r * math.Cos(theta))
dy := raster.Fix32(r * math.Sin(theta))
d := raster.Point{X: dx, Y: dy}
// Draw a quarter-circle approximated by two quadratic segments,
// with each segment spanning 45 degrees.
z.Start(c)
z.Add1(c.Add(raster.Point{X: r, Y: 0}))
z.Add2(c.Add(raster.Point{X: r, Y: t}), c.Add(raster.Point{X: s, Y: s}))
z.Add2(c.Add(raster.Point{X: t, Y: r}), c.Add(raster.Point{X: 0, Y: r}))
// Add another quadratic segment whose angle ranges between 0 and 90 degrees.
// For an explanation of the magic constants 22, 150, 181 and 256, read the
// comments in the freetype/raster package.
dot := 256 * d.Dot(raster.Point{X: 0, Y: r}) / (r * r)
multiple := raster.Fix32(150 - 22*(dot-181)/(256-181))
z.Add2(c.Add(raster.Point{X: dx, Y: r + dy}.Mul(multiple)), c.Add(d))
// Close the curve.
z.Add1(c)
}
z.Rasterize(mp)
for i := 0; i < n; i++ {
cx := raster.Fix32(25600 + 51200*(i%4))
cy := raster.Fix32(2560 + 32000*(i/4))
for j := 0; j < n; j++ {
theta := math.Pi * float64(j) / (n - 1)
dx := raster.Fix32(r * math.Cos(theta))
dy := raster.Fix32(r * math.Sin(theta))
m.Set(int((cx+dx)/256), int((cy+dy)/256), color.RGBA{255, 255, 0, 255})
}
}
// Save that RGBA image to disk.
f, err := os.Create("out.png")
if err != nil {
log.Println(err)
os.Exit(1)
}
defer f.Close()
b := bufio.NewWriter(f)
err = png.Encode(b, m)
if err != nil {
log.Println(err)
os.Exit(1)
}
err = b.Flush()
if err != nil {
log.Println(err)
os.Exit(1)
}
fmt.Println("Wrote out.png OK.")
}