// textBox renders t into a tight fitting image
func (ig *ImageGraphics) textBox(t string, size int) image.Image {
// Initialize the context.
fg := image.NewUniform(color.Alpha{0xff})
bg := image.NewUniform(color.Alpha{0x00})
canvas := image.NewAlpha(image.Rect(0, 0, 400, 2*size))
draw.Draw(canvas, canvas.Bounds(), bg, image.ZP, draw.Src)
c := freetype.NewContext()
c.SetDPI(dpi)
c.SetFont(ig.font)
c.SetFontSize(float64(size))
c.SetClip(canvas.Bounds())
c.SetDst(canvas)
c.SetSrc(fg)
// Draw the text.
h := c.FUnitToPixelRU(ig.font.UnitsPerEm())
pt := freetype.Pt(0, h)
extent, err := c.DrawString(t, pt)
if err != nil {
log.Println(err)
return nil
}
// log.Printf("text %q, extent: %v", t, extent)
return canvas.SubImage(image.Rect(0, 0, int(extent.X/256), h*5/4))
}
func TestSrcMask(t *testing.T) {
srcMask := image.NewRGBA(image.Rect(0, 0, 23, 1))
srcMask.SetRGBA(19, 0, color.RGBA{0x00, 0x00, 0x00, 0x7f})
srcMask.SetRGBA(20, 0, color.RGBA{0x00, 0x00, 0x00, 0xff})
srcMask.SetRGBA(21, 0, color.RGBA{0x00, 0x00, 0x00, 0x3f})
srcMask.SetRGBA(22, 0, color.RGBA{0x00, 0x00, 0x00, 0x00})
red := image.NewUniform(color.RGBA{0xff, 0x00, 0x00, 0xff})
blue := image.NewUniform(color.RGBA{0x00, 0x00, 0xff, 0xff})
dst := image.NewRGBA(image.Rect(0, 0, 6, 1))
Copy(dst, image.Point{}, blue, dst.Bounds(), Src, nil)
NearestNeighbor.Scale(dst, dst.Bounds(), red, image.Rect(0, 0, 3, 1), Over, &Options{
SrcMask: srcMask,
SrcMaskP: image.Point{20, 0},
})
got := [6]color.RGBA{
dst.RGBAAt(0, 0),
dst.RGBAAt(1, 0),
dst.RGBAAt(2, 0),
dst.RGBAAt(3, 0),
dst.RGBAAt(4, 0),
dst.RGBAAt(5, 0),
}
want := [6]color.RGBA{
{0xff, 0x00, 0x00, 0xff},
{0xff, 0x00, 0x00, 0xff},
{0x3f, 0x00, 0xc0, 0xff},
{0x3f, 0x00, 0xc0, 0xff},
{0x00, 0x00, 0xff, 0xff},
{0x00, 0x00, 0xff, 0xff},
}
if got != want {
t.Errorf("\ngot %v\nwant %v", got, want)
}
}
// textBox renders t into a tight fitting image
func (ig *ImageGraphics) textBox(t string, font chart.Font) image.Image {
// Initialize the context.
fg := image.NewUniform(color.Alpha{0xff})
bg := image.NewUniform(color.Alpha{0x00})
width := ig.TextLen(t, font)
size := ig.relFontsizeToPixel(font.Size)
canvas := image.NewAlpha(image.Rect(0, 0, width, int(1.5*size+0.5)))
draw.Draw(canvas, canvas.Bounds(), bg, image.ZP, draw.Src)
c := freetype.NewContext()
c.SetDPI(dpi)
c.SetFont(ig.font)
c.SetFontSize(size)
c.SetClip(canvas.Bounds())
c.SetDst(canvas)
c.SetSrc(fg)
// Draw the text.
h := c.FUnitToPixelRU(ig.font.UnitsPerEm())
pt := freetype.Pt(0, h)
extent, err := c.DrawString(t, pt)
if err != nil {
log.Println(err)
return nil
}
// log.Printf("text %q, extent: %v", t, extent)
return canvas.SubImage(image.Rect(0, 0, int((extent.X+127)/256), h*5/4))
}
func (ff *FontFace) GetImage(text string) (img draw.Image, err error) {
var (
src image.Image
bg image.Image
dst draw.Image
pt fixed.Point26_6
w int
h int
)
src = image.NewUniform(ff.fg)
bg = image.NewUniform(ff.bg)
w = int(float32(len(text)) * ff.charw)
h = int(ff.charh)
dst = image.NewRGBA(image.Rect(0, 0, w, h))
draw.Draw(dst, dst.Bounds(), bg, image.ZP, draw.Src)
ff.context.SetSrc(src)
ff.context.SetDst(dst)
ff.context.SetClip(dst.Bounds())
pt = freetype.Pt(0, int(ff.charh+ff.offy))
if pt, err = ff.context.DrawString(text, pt); err != nil {
return
}
img = image.NewRGBA(image.Rect(0, 0, int(pt.X/64), int(pt.Y/64)))
draw.Draw(img, img.Bounds(), dst, image.Pt(0, -int(ff.offy)), draw.Src)
return
}
func (f *Font) Render(text string) *Texture {
width, height, yBearing := f.TextDimensions(text)
font := f.ttf
size := f.Size
// Colors
fg := image.NewUniform(color.NRGBA{f.FG.R, f.FG.G, f.FG.B, f.FG.A})
bg := image.NewUniform(color.NRGBA{f.BG.R, f.BG.G, f.BG.B, f.BG.A})
// Create the font context
c := freetype.NewContext()
nrgba := image.NewNRGBA(image.Rect(0, 0, width, height))
draw.Draw(nrgba, nrgba.Bounds(), bg, image.ZP, draw.Src)
c.SetDPI(dpi)
c.SetFont(font)
c.SetFontSize(size)
c.SetClip(nrgba.Bounds())
c.SetDst(nrgba)
c.SetSrc(fg)
// Draw the text.
pt := freetype.Pt(0, int(yBearing))
_, err := c.DrawString(text, pt)
if err != nil {
log.Println(err)
return nil
}
// Create texture
imObj := &ImageObject{nrgba}
return NewTexture(imObj)
}
func split(img image.Image) (textImg, bgImg image.Image) {
size := img.Bounds().Max
text := image.NewGray(img.Bounds())
bg := image.NewRGBA(img.Bounds())
// copy image to background
draw.Src.Draw(bg, img.Bounds(), img, img.Bounds().Min)
// make text white
draw.Src.Draw(text, img.Bounds(), image.NewUniform(color.White), image.Point{})
for x := 0; x+32 <= size.X; x += 16 {
for y := 0; y+32 <= size.Y; y += 16 {
pt := image.Point{X: x, Y: y}
pt2 := image.Point{X: x + 32, Y: y + 32}
col, ok := isBitonal(img, pt)
if ok {
// fill uniform
draw.Src.Draw(bg, image.Rectangle{Min: pt, Max: pt2},
image.NewUniform(col), image.Point{})
// extract text
ref := asYCbCr(col)
for i := 0; i < 32; i++ {
for j := 0; j < 32; j++ {
col := asYCbCr(img.At(x+i, y+j))
val := float64(col.Y) / float64(ref.Y) * 256
if val >= 256 {
val = 255
}
text.SetGray(x+i, y+j, color.Gray{uint8(val)})
}
}
}
}
}
return text, bg
}
func (c *Context) Render(txt string, size float64, col color.Color) (*image.RGBA, error) {
bnd := c.fnt.Bounds(fixed.I(int(size + 0.5)))
lh := int26_6ToFloat64(bnd.Max.Y) - int26_6ToFloat64(bnd.Min.Y) - 0.5
c.ft.SetSrc(image.NewUniform(col))
c.ft.SetFontSize(size)
/* Render image to temporary buffer to determine final size */
tmp := nullImage{}
c.ft.SetDst(tmp)
c.ft.SetClip(tmp.Bounds())
p, err := c.ft.DrawString(txt, fixed.P(0, int(lh)))
if err != nil {
return nil, err
}
dst := image.NewRGBA(image.Rect(0, 0, int(int26_6ToFloat64(p.X)+0.5), int(lh)))
draw.Draw(dst, dst.Bounds(), image.NewUniform(color.RGBA{}), image.ZP, draw.Src)
c.ft.SetDst(dst)
c.ft.SetClip(dst.Bounds())
p, err = c.ft.DrawString(txt, fixed.P(0, int(size)))
if err != nil {
return nil, err
}
return dst, nil
}
func (ff *FontFace) GetText(text string) (t *Texture, err error) {
var (
src image.Image
bg image.Image
dst draw.Image
shortened draw.Image
pt fixed.Point26_6
w int
h int
)
src = image.NewUniform(ff.fg)
bg = image.NewUniform(ff.bg)
w = int(float32(len(text)) * ff.charw)
h = int(ff.charh)
dst = image.NewRGBA(image.Rect(0, 0, w, h))
draw.Draw(dst, dst.Bounds(), bg, image.ZP, draw.Src)
ff.context.SetSrc(src)
ff.context.SetDst(dst)
ff.context.SetClip(dst.Bounds())
pt = freetype.Pt(0, int(ff.charh))
if pt, err = ff.context.DrawString(text, pt); err != nil {
return
}
// if err = WritePNG("hello.png", dst); err != nil {
// return
// }
shortened = image.NewRGBA(image.Rect(0, 0, int(pt.X/64), h))
draw.Draw(shortened, shortened.Bounds(), dst, image.ZP, draw.Src)
t, err = GetTexture(shortened, gl.NEAREST)
return
}
func TestDrawView(t *testing.T) {
const str = "Hello World!\nHow are you doing?"
f1 := truetype.NewFace(clearSans, &truetype.Options{DPI: 144})
f2 := truetype.NewFace(clearSansBoldItalic, &truetype.Options{DPI: 144})
red := image.NewUniform(color.RGBA{255, 0, 0, 255})
yellow := image.NewUniform(color.RGBA{255, 255, 0, 255})
view, _ := Render(
NewReader(
strings.NewReader("Hello World!\nHow are you doing?"),
Style{Offset: 0, Face: f1, Foreground: image.Black, Background: yellow},
Style{Offset: 10, Face: f2, Foreground: red, Background: yellow},
Style{Offset: 20, Face: f1, Foreground: image.Black, Background: image.White},
),
NewNaturalLayout(fixed.P(0, 0)),
)
size := view.Bounds.Max.Sub(view.Bounds.Min)
for _, a := range []Alignment{Left, Right, Center, Justify} {
dst := image.NewRGBA(image.Rect(0, 0, int(size.X>>6)+1, int(size.Y>>6)+1))
view.Align(a)
view.Draw(dst, LeftToRight)
saveTest(t, dst, "text.View.Draw_"+a.(fmt.Stringer).String()+".png")
}
}
func Example() {
// As usual in examples, this ignores all errors. Don't do this in your program.
// setup and find start point for centering
s := "Hello, World!"
size := image.Rect(0, 0, 120, 20)
dst := image.NewRGBA(size)
c := freetype.NewContext()
c.SetFont(font)
c.SetFontSize(14.0)
c.SetSrc(image.NewUniform(color.Black))
c.SetDst(dst)
start, _ := fontutil.CenterX(c, s, size) // CenterX calls c.SetClip(size)
// perform draw at start.X + y 16
c.DrawString(s, start.Add(freetype.Pt(0, 16)))
// write the image out to a file
// out, _ := os.Create("helloworld.png")
// defer out.Close()
// write image to hash for testing purposes
out := fnv.New64()
_ = png.Encode(out, dst)
fmt.Printf("Hash of compressed image: %x", out.Sum64())
// Output: Hash of compressed image: fa83a1b8d8abf5f2
}
// Render renders the grid each time a value is sent on the render channel.
func Render(win wde.Window, g *grid.Grid, render chan bool) {
screen := win.Screen()
bounds := screen.Bounds()
grey := image.NewUniform(color.RGBA{R: 0xF9, G: 0xF9, B: 0xF9}) /// ### todo ### A: 0xFF?
for {
<-render
// Draw grid background.
draw.Draw(screen, bounds, grey, image.ZP, draw.Src)
draw.Draw(screen, bounds, imgGrid, image.ZP, draw.Over)
// Draw grid markers.
var img image.Image
for col := 0; col < g.Width(); col++ {
for row := 0; row < g.Height(); row++ {
switch g[col][row] {
case grid.MarkO:
img = imgO
case grid.MarkX:
img = imgX
default:
continue
}
pt := getCellPt(col, row, g[col][row])
rect := image.Rect(0, 0, img.Bounds().Dx(), img.Bounds().Dy())
draw.Draw(screen, rect.Add(pt), img, image.ZP, draw.Over)
}
}
// Flush screen updates.
win.FlushImage(bounds)
}
}
func main() {
const order = 8
const width = 1 << order
const margin = 10
bounds := image.Rect(-margin, -margin, width+2*margin, width+2*margin)
im := image.NewGray(bounds)
gBlack := color.Gray{0}
gWhite := color.Gray{255}
draw.Draw(im, bounds, image.NewUniform(gWhite), image.ZP, draw.Src)
for y := 0; y < width; y++ {
for x := 0; x < width; x++ {
if x&y == 0 {
im.SetGray(x, y, gBlack)
}
}
}
f, err := os.Create("sierpinski.png")
if err != nil {
fmt.Println(err)
return
}
if err = png.Encode(f, im); err != nil {
fmt.Println(err)
}
if err = f.Close(); err != nil {
fmt.Println(err)
}
}
func main() {
scale := width / (rMax - rMin)
height := int(scale * (iMax - iMin))
bounds := image.Rect(0, 0, width, height)
b := image.NewNRGBA(bounds)
draw.Draw(b, bounds, image.NewUniform(color.Black), image.ZP, draw.Src)
for x := 0; x < width; x++ {
for y := 0; y < height; y++ {
fEsc := mandelbrot(complex(
float64(x)/scale+rMin,
float64(y)/scale+iMin))
b.Set(x, y, color.NRGBA{uint8(red * fEsc),
uint8(green * fEsc), uint8(blue * fEsc), 255})
}
}
f, err := os.Create("mandelbrot.png")
if err != nil {
fmt.Println(err)
return
}
if err = png.Encode(f, b); err != nil {
fmt.Println(err)
}
if err = f.Close(); err != nil {
fmt.Println(err)
}
}
func createSwatch(col color.Color, size int) image.Image {
log.Printf("Creating swatch for %v\n", col)
bounds := image.Rect(0, 0, size, size)
img := image.NewNRGBA(bounds)
draw.Draw(img, img.Bounds(), image.NewUniform(col), img.Bounds().Min, draw.Src)
return img
}
func draw_image(filename string, plot_map map[Key]Point, width int, height int, gradient string) {
build_gradient(gradient)
fill_palette()
bounds := image.Rect(0, 0, width, height)
b := image.NewNRGBA(bounds)
draw.Draw(b, bounds, image.NewUniform(color.Black), image.ZP, draw.Src)
for x := 0; x < width; x += 1 {
for y := 0; y < height; y += 1 {
var p = plot_map[Key{x, y}]
b.Set(p.X, p.Y, get_colour(p.Escape))
}
}
file, err := os.Create(filename)
if err != nil {
fmt.Println(err)
}
if err = jpeg.Encode(file, b, &jpeg.Options{jpeg.DefaultQuality}); err != nil {
fmt.Println(err)
}
if err = file.Close(); err != nil {
fmt.Println(err)
}
}
func (w *Window) DrawFrame(frame int) {
var f Frame
var err os.Error
if frame >= w.FrameCount {
return
}
f = w.Frames[frame]
if f.img == nil {
f.img, err = getImage(f.Path)
if err != nil {
return
}
}
draw.Draw(w.Screen, f.img.Bounds(), f.img, image.Point{0, 0}, draw.Over)
if w.State == WORKING {
draw.Draw(w.Screen, image.Rectangle{image.Point{0, 0}, image.Point{20, 20}},
image.NewUniform(color.RGBA{0, 255, 0, 255}), image.Point{0, 0}, draw.Src)
}
DrawCircle(w.Screen, f.Centre.Centre, f.Centre.Radius, color.RGBA{0, 255, 255, 255})
w.Window.FlushImage()
}
func (c *Context) RenderMultiline(txt []string, size float64, bg, fg color.Color) (*image.RGBA, error) {
w, h := 0, 0
imgs := []*image.RGBA{}
for _, l := range txt {
i, err := c.Render(l, size, fg)
if err != nil {
return nil, err
}
if i.Bounds().Dx() > w {
w = i.Bounds().Dx()
}
h += i.Bounds().Dy()
imgs = append(imgs, i)
}
dst := image.NewRGBA(image.Rect(0, 0, w, h))
draw.Draw(dst, dst.Bounds(), image.NewUniform(bg), image.ZP, draw.Src)
y := 0
for _, src := range imgs {
sr := src.Bounds()
dp := image.Point{0, y}
r := image.Rectangle{dp, dp.Add(sr.Size())}
draw.Draw(dst, r, src, sr.Min, draw.Src)
y += sr.Dy()
}
return dst, nil
}
func main() {
flag.Parse()
dir := flag.Arg(0)
if dir == "" {
fmt.Fprintf(os.Stderr, "Images not specified.")
flag.Usage()
os.Exit(1)
}
files, err := ioutil.ReadDir(dir)
check(err)
w, h := *width, *height
collage := image.NewRGBA(image.Rect(0, 0, w*2, h*len(files)))
draw.Draw(collage, collage.Bounds(), image.NewUniform(color.RGBA{0xFF, 0xFF, 0xFF, 0xFF}), image.Point{}, draw.Src)
for i, file := range files {
fmt.Println("Processing ", file.Name())
m, err := ycbcr.FromFile(filepath.Join(dir, file.Name()))
check(err)
drawcell(collage, m, 0, i, w, h)
process(m)
drawcell(collage, m, 1, i, w, h)
}
check(ycbcr.ToFile(*output, collage))
}
func drawBarcode(img *image.Gray, unitSize, xPos, yPos float64, num int) {
drawSO(img, unitSize, xPos, yPos)
x := xPos + unitSize*4.0
// Draw reference bar
x += drawBar(img, unitSize, x, yPos, 0) + unitSize
// Print the form number below the barcode
ftContext.SetFontSize(7)
ftContext.SetSrc(image.NewUniform(color.Black))
ftContext.DrawString(fmt.Sprintf("%d", num), freetype.Pt(int(x), int(yPos+unitSize*7)))
// Draw bars
ds := toBase4(num, 9)
for i := len(ds) - 1; i >= 0; i-- {
x += drawBar(img, unitSize, x, yPos, ds[i]) + unitSize
}
// Draw checksum bars
ckBase10 := csumGen(num)
fmt.Println("ckBase10 = ", ckBase10)
ck := toBase4(ckBase10, 2)
fmt.Println("ck = ", ck)
for i := len(ck) - 1; i >= 0; i-- {
x += drawBar(img, unitSize, x, yPos, ck[i]) + unitSize
}
}
func main() {
fmt.Println("Criando arquivo")
file, err := os.Create("imagem1.png")
if err != nil {
fmt.Println("Impossivel abrir ou criar arquivo")
fmt.Println(err)
return
}
defer file.Close()
fmt.Println("Sem erros")
imagem := image.NewRGBA(image.Rect(0, 0, 513, 257))
draw.Draw(imagem, imagem.Bounds(), image.NewUniform(color.RGBA{100, 150, 255, 255}), image.ZP, draw.Src)
create(imagem)
err = png.Encode(file, imagem)
if err != nil {
fmt.Println(err)
}
}
// NewText creates a new Text object. The x and y positions represent the left
// and bottom of text without tails.
func NewText(x, y float64, font *Font, fontSize float64, message string) (*Text, error) {
text := &Text{}
text.x = x
text.y = y - fontSize
text.fontColor = image.NewUniform(color.RGBA{0, 0, 0, 255})
text.context = freetype.NewContext()
text.context.SetDPI(dpi)
text.context.SetFont(font.font)
text.context.SetFontSize(fontSize)
text.context.SetSrc(text.fontColor)
text.context.SetHinting(freetype.FullHinting)
text.fontSize = fontSize
err := text.SetMessage(message)
if err != nil {
return text, err
}
return text, nil
}
func DrawString(dst draw.Image, s string, color color.Color, size, x, y int) int {
c := image.NewUniform(color)
for _, r := range s {
x = drawRune(dst, r, c, size, x, y)
}
return x
}
func (gc *ImageGraphicContext) FillString(text string) (cursor float64) {
gc.freetype.SetSrc(image.NewUniform(gc.Current.StrokeColor))
// Draw the text.
x, y := gc.Current.Path.LastPoint()
gc.Current.Tr.Transform(&x, &y)
x0, fontSize := 0.0, gc.Current.FontSize
gc.Current.Tr.VectorTransform(&x0, &fontSize)
font := GetFont(gc.Current.FontData)
if font == nil {
font = GetFont(defaultFontData)
}
if font == nil {
return 0
}
gc.freetype.SetFont(font)
gc.freetype.SetFontSize(fontSize)
pt := freetype.Pt(int(x), int(y))
p, err := gc.freetype.DrawString(text, pt)
if err != nil {
log.Println(err)
}
x1, _ := gc.Current.Path.LastPoint()
x2, y2 := float64(p.X)/256, float64(p.Y)/256
gc.Current.Tr.InverseTransform(&x2, &y2)
width := x2 - x1
return width
}
func main() {
bounds := image.Rect(0, 0, 100, 100)
im := image.NewGray(bounds)
gBlack := color.Gray{0}
gWhite := color.Gray{255}
draw.Draw(im, bounds, image.NewUniform(gWhite), image.ZP, draw.Src)
pos := image.Point{50, 50}
dir := up
for pos.In(bounds) {
switch im.At(pos.X, pos.Y).(color.Gray).Y {
case gBlack.Y:
im.SetGray(pos.X, pos.Y, gWhite)
dir--
case gWhite.Y:
im.SetGray(pos.X, pos.Y, gBlack)
dir++
}
if dir&1 == 1 {
pos.X += 1 - dir&2
} else {
pos.Y -= 1 - dir&2
}
}
f, err := os.Create("ant.png")
if err != nil {
fmt.Println(err)
return
}
if err = png.Encode(f, im); err != nil {
fmt.Println(err)
}
if err = f.Close(); err != nil {
fmt.Println(err)
}
}
// Render draws rune r front the specified font at the specified dpi and scale. It returns a
// grayscale image that is just large enough to contain the rune.
func Render(font *truetype.Font, r rune, dpi, scale float64) (*image.Gray, error) {
glyph := truetype.NewGlyphBuf()
index := font.Index(r)
glyph.Load(font, font.FUnitsPerEm(), index, truetype.FullHinting)
ctx := freetype.NewContext()
boxer := makeBoundingBoxer()
ctx.SetSrc(image.NewUniform(color.White))
ctx.SetDst(boxer)
ctx.SetClip(boxer.largeBounds)
ctx.SetFontSize(250)
ctx.SetDPI(dpi)
ctx.SetFont(font)
if err := glyph.Load(font, font.FUnitsPerEm(), font.Index(r), truetype.FullHinting); err != nil {
return nil, fmt.Errorf("Unable to load glyph: %v\n", err)
}
var rp raster.Point
rp.X = ctx.PointToFix32(0)
rp.Y = ctx.PointToFix32(100)
ctx.DrawString(string(r), rp)
boxer.complete()
g := gift.New(
gift.Resize(int(float64(boxer.Bounds().Dx())*scale+0.5), int(float64(boxer.Bounds().Dy())*scale+0.5), gift.CubicResampling),
)
dst := image.NewGray(g.Bounds(boxer.Bounds()))
g.Draw(dst, boxer)
return dst, nil
}
// Pad reads a photosphere image and writes a padded 360 degree x 180 degree image to a given writer.
func Pad(w io.Writer, ir io.Reader) (pano *PanoOpts, err error) {
d, err := ioutil.ReadAll(ir)
if err != nil {
return nil, err
}
r := bufio.NewReader(bytes.NewReader(d))
for {
s, err := NextSection(r, APP1)
if err != nil {
return nil, err
}
if s == nil {
break
}
if IsXMP(s) {
meta := new(XMPMeta)
err := xml.Unmarshal(ExtractXMP(s), meta)
if err != nil {
// Not XMP?
continue
}
if meta.PanoOpts.NS != "http://ns.google.com/photos/1.0/panorama/" {
// Different XMP
continue
}
pano = meta.PanoOpts
break
}
}
if pano == nil {
return nil, errors.New("image provided had no photo sphere metadata")
}
src, err := jpeg.Decode(bytes.NewReader(d))
if err != nil {
return nil, err
}
srcB := src.Bounds()
// Sometimes the height in the metadata doesn't match the actual height.
// If that's the case, scale all of the other parameters.
if srcB.Dy() != pano.Height {
scale := float64(srcB.Dy()) / float64(pano.Height)
pano.TotalHeight = int(float64(pano.TotalHeight) * scale)
pano.TotalWidth = int(float64(pano.TotalWidth) * scale)
pano.Top = int(float64(pano.Top) * scale)
pano.Left = int(float64(pano.Left) * scale)
}
dst := image.NewRGBA(image.Rect(0, 0, pano.TotalWidth, pano.TotalHeight))
draw.Draw(dst, dst.Bounds(), image.NewUniform(color.Black), image.ZP, draw.Src)
compositeBounds := image.Rect(pano.Left, pano.Top, pano.Left+srcB.Dx(), pano.Top+srcB.Dy())
draw.Draw(dst, compositeBounds, src, image.ZP, draw.Src)
err = jpeg.Encode(w, dst, nil)
return pano, err
}
func hough(im image.Image, ntx, mry int) draw.Image {
nimx := im.Bounds().Max.X
mimy := im.Bounds().Max.Y
mry = int(mry/2) * 2
him := image.NewGray(image.Rect(0, 0, ntx, mry))
draw.Draw(him, him.Bounds(), image.NewUniform(color.White),
image.ZP, draw.Src)
rmax := math.Hypot(float64(nimx), float64(mimy))
dr := rmax / float64(mry/2)
dth := math.Pi / float64(ntx)
for jx := 0; jx < nimx; jx++ {
for iy := 0; iy < mimy; iy++ {
col := color.GrayModel.Convert(im.At(jx, iy)).(color.Gray)
if col.Y == 255 {
continue
}
for jtx := 0; jtx < ntx; jtx++ {
th := dth * float64(jtx)
r := float64(jx)*math.Cos(th) + float64(iy)*math.Sin(th)
iry := mry/2 - int(math.Floor(r/dr+.5))
col = him.At(jtx, iry).(color.Gray)
if col.Y > 0 {
col.Y--
him.SetGray(jtx, iry, col)
}
}
}
}
return him
}
// Color in HEX format: FAFAFA
func (g *Gummy) DrawText(text, textColor string, fontSize, xPosition, yPosition int) error {
// Get black or white depending on the background
if textColor == "" {
c := (*g.Color).(color.RGBA)
if blackWithBackground(float64(c.R), float64(c.G), float64(c.B)) {
textColor = "000000"
} else {
textColor = "FFFFFF"
}
}
fc := freetype.NewContext()
fc.SetDst(g.Img)
fc.SetFont(g.Font)
fc.SetClip(g.Img.Bounds())
// Color parsing
cr, _ := strconv.ParseUint(string(textColor[:2]), 16, 64)
cg, _ := strconv.ParseUint(string(textColor[2:4]), 16, 64)
cb, _ := strconv.ParseUint(string(textColor[4:]), 16, 64)
c := image.NewUniform(color.RGBA{R: uint8(cr), G: uint8(cg), B: uint8(cb), A: 255})
fc.SetSrc(c)
fc.SetFontSize(float64(fontSize))
_, err := fc.DrawString(text, freetype.Pt(xPosition, yPosition))
return err
}
func main() {
file, err := os.Create("circle.png")
if err != nil {
fmt.Println(err)
}
defer file.Close()
imagem := image.NewRGBA(image.Rect(-lado, -lado, lado, lado))
draw.Draw(imagem, imagem.Bounds(), image.NewUniform(color.RGBA{40, 125, 80, 255}), image.ZP, draw.Src)
for raio := 65; raio > 0; raio-- {
Circle(imagem, cor, float64(raio))
cor.R += 6
cor.G += 6
cor.B += 6
//fmt.Println(cor)
}
err = png.Encode(file, imagem)
if err != nil {
fmt.Println(err)
}
}
func (font *Font) updateTexture(texture uint32, text string, width int, height int, size float64, dpi float64, rgba color.Color) (int, int) {
context := freetype.NewContext()
context.SetFont(font.ttf)
img := image.NewRGBA(image.Rect(0, 0, width, height))
r, g, b, _ := rgba.RGBA()
draw.Draw(img, img.Bounds(), image.NewUniform(color.RGBA{uint8(r), uint8(g), uint8(b), 0}), image.ZP, draw.Src)
context.SetDst(img)
context.SetClip(img.Bounds())
context.SetSrc(image.NewUniform(rgba))
context.SetFontSize(size)
context.SetDPI(dpi)
pixelBounds, _ := context.DrawString(text, freetype.Pt(0, height/2))
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.TexSubImage2D(
gl.TEXTURE_2D,
0,
0,
0,
int32(img.Rect.Size().X),
int32(img.Rect.Size().Y),
gl.RGBA,
gl.UNSIGNED_BYTE,
gl.Ptr(img.Pix))
return int26_6Ceiling(pixelBounds.X + 0x3f), int26_6Ceiling(pixelBounds.Y + 0x3f)
}
