// Convert a []float64 to an image, reading data with the format specified in
// chans (e.g. RGBA, BGRA, BRG, RRR). If a component is not specified in the
func FromSliceChans(img *Image, chans string, fill float64, data []float64) {
surf := img.Surf
cm := surf.ColorModel()
b := surf.Bounds()
minX, maxX := b.Min.X, b.Max.X
minY, maxY := b.Min.Y, b.Max.Y
k := 0
nc := len(chans)
const mk = 0xff
dfill := clamp8(fill) & mk
for i := minY; i < maxY; i++ {
for j := minX; j < maxX; j++ {
outCol := color.RGBA{dfill, dfill, dfill, dfill}
for c := 0; c < nc; c++ {
switch chans[c] {
case 'r', 'R':
outCol.R = clamp8(data[k+c]) & mk
case 'g', 'G':
outCol.G = clamp8(data[k+c]) & mk
case 'b', 'B':
outCol.B = clamp8(data[k+c]) & mk
case 'a', 'A':
outCol.A = clamp8(data[k+c]) & mk
default:
// Just skip the channel
}
}
k += nc
img.Surf.Set(j, i, cm.Convert(outCol))
}
}
}
func (cf *ColorFinder) buildColorMap() *map[color.RGBA]colorStats {
colorMap := make(map[color.RGBA]colorStats)
bounds := cf.img.Bounds()
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
r, g, b, a := cf.img.At(x, y).RGBA()
rgb := color.RGBA{}
rgb.R = uint8(r >> shiftRGB)
rgb.G = uint8(g >> shiftRGB)
rgb.B = uint8(b >> shiftRGB)
rgb.A = uint8(a >> shiftRGB)
colrStats, exist := colorMap[rgb]
if exist {
colrStats.count++
} else {
colrStats := colorStats{count: 1, weight: weight(&rgb)}
if colrStats.weight <= 0 {
colrStats.weight = 1e-10
}
colorMap[rgb] = colrStats
}
}
}
return &colorMap
}
func superSampling(inputImage image.Image) image.Image {
rect := inputImage.Bounds()
width := rect.Size().X
height := rect.Size().Y
rect2 := image.Rect(rect.Min.X, rect.Min.Y, rect.Max.X-1, rect.Max.Y-1)
rgba := image.NewRGBA(rect2)
for x := 0; x < width-1; x++ {
for y := 0; y < height-1; y++ {
var col color.RGBA
// 座標(x,y)のR, G, B, α の値を取得
r00, g00, b00, a00 := inputImage.At(x, y).RGBA()
r01, g01, b01, a01 := inputImage.At(x, y+1).RGBA()
r10, g10, b10, a10 := inputImage.At(x+1, y).RGBA()
r11, g11, b11, a11 := inputImage.At(x+1, y+1).RGBA()
col.R = uint8((uint(uint8(r00)) + uint(uint8(r01)) + uint(uint8(r10)) + uint(uint8(r11))) / 4)
col.G = uint8((uint(uint8(g00)) + uint(uint8(g01)) + uint(uint8(g10)) + uint(uint8(g11))) / 4)
col.B = uint8((uint(uint8(b00)) + uint(uint8(b01)) + uint(uint8(b10)) + uint(uint8(b11))) / 4)
col.A = uint8((uint(uint8(a00)) + uint(uint8(a01)) + uint(uint8(a10)) + uint(uint8(a11))) / 4)
rgba.Set(x, y, col)
}
}
return rgba.SubImage(rect)
}
func mapToColor(o map[string]interface{}) color.Color {
var c color.RGBA
// Because JavaScript
switch x := o["r"].(type) {
case int64:
c.R = uint8(colorF(float64(x)))
case float64:
c.R = uint8(colorF(x))
}
switch x := o["g"].(type) {
case int64:
c.G = uint8(colorF(float64(x)))
case float64:
c.G = uint8(colorF(x))
}
switch x := o["b"].(type) {
case int64:
c.B = uint8(colorF(float64(x)))
case float64:
c.B = uint8(colorF(x))
}
c.A = 0xff
return c
}
func (cf *ColorFinder) findMainColor(colorMap *map[color.RGBA]colorStats, shift uint, targetColor *shiftedRGBA) shiftedRGBA {
colorWeights := make(map[shiftedRGBA]float64)
bounds := cf.img.Bounds()
stepLength := stepLength(bounds)
for y := bounds.Min.Y; y < bounds.Max.Y; y += stepLength {
for x := bounds.Min.X; x < bounds.Max.X; x += stepLength {
r, g, b, a := cf.img.At(x, y).RGBA()
color := color.RGBA{}
color.R = uint8(r >> shiftRGB)
color.G = uint8(g >> shiftRGB)
color.B = uint8(b >> shiftRGB)
color.A = uint8(a >> shiftRGB)
if rgbMatchesTargetColor(targetColor, &color) {
increaseColorWeight(&colorWeights, colorMap, &color, shift)
}
}
}
maxColor := shiftedRGBA{}
maxWeight := 0.0
for sRGB, weight := range colorWeights {
if weight > maxWeight {
maxColor = sRGB
maxWeight = weight
}
}
return maxColor
}
func colorForPixel(isBlack bool) color.RGBA {
col := color.RGBA{}
if isBlack {
col.A = 255
}
return col
}
// Return the complementary color
func Complementary(v color.RGBA) [2]color.RGBA {
var result color.RGBA
result.R = 255 - v.R
result.G = 255 - v.G
result.B = 255 - v.B
result.A = v.A
return [2]color.RGBA{v, result}
}
// Apply the given color mapping to the specified image buffers.
func Apply(from, to *Rule, src, dst draw.Image) {
var x, y int
var r, g, b, a uint32
var sc color.Color
var dc color.RGBA
var pix pixel
rect := src.Bounds()
for y = 0; y < rect.Dy(); y++ {
for x = 0; x < rect.Dx(); x++ {
sc = src.At(x, y)
r, g, b, a = sc.RGBA()
pix.r = uint8(r >> 8)
pix.g = uint8(g >> 8)
pix.b = uint8(b >> 8)
pix.a = uint8(a >> 8)
// Check if the pixel matches the filter rule.
if !(match(pix.r, from.R) && match(pix.g, from.G) && match(pix.b, from.B) && match(pix.a, from.A)) {
dst.Set(x, y, sc)
continue
}
// Compute three different types of grayscale conversion.
// These can be applied by named references.
pix.average = uint8(((r + g + b) / 3) >> 8)
pix.lightness = uint8(((min(min(r, g), b) + max(max(r, g), b)) / 2) >> 8)
// For luminosity it is necessary to apply an inverse of the gamma
// function for the color space before calculating the inner product.
// Then you apply the gamma function to the reduced value. Failure to
// incorporate the gamma function can result in errors of up to 20%.
//
// For typical computer stuff, the color space is sRGB. The right
// numbers for sRGB are approx. 0.21, 0.72, 0.07. Gamma for sRGB
// is a composite function that approximates exponentiation by 1/2.2
//
// This is a rather expensive operation, but gives a much more accurate
// and satisfactory result than the average and lightness versions.
pix.luminosity = gammaSRGB(
0.212655*invGammaSRGB(pix.r) +
0.715158*invGammaSRGB(pix.g) +
0.072187*invGammaSRGB(pix.b))
// Transform color.
dc.R = transform(&pix, pix.r, to.R)
dc.G = transform(&pix, pix.g, to.G)
dc.B = transform(&pix, pix.b, to.B)
dc.A = transform(&pix, pix.a, to.A)
// Set new pixel.
dst.Set(x, y, dc)
}
}
}
func setAlpha(c color.RGBA, a uint8) color.RGBA {
if c.A == 0 {
return c
}
c.R = mult(c.R, a, c.A)
c.G = mult(c.G, a, c.A)
c.B = mult(c.B, a, c.A)
c.A = a
return c
}
func parseColors(args []*ast.BasicLit) (color.RGBA, error) {
ints := make([]uint8, 4)
var ret color.RGBA
var u uint8
for i := range args {
v := args[i]
switch v.Kind {
case token.FLOAT:
f, err := strconv.ParseFloat(args[i].Value, 8)
if err != nil {
return ret, err
}
// Has to be alpha, or bust
u = uint8(f * 100)
case token.INT:
i, err := strconv.Atoi(v.Value)
if err != nil {
return ret, err
}
u = uint8(i)
case token.COLOR:
if i != 0 {
return ret, fmt.Errorf("hex is only allowed as the first argumetn found: % #v", v)
}
var err error
ret, err = ast.ColorFromHexString(v.Value)
if err != nil {
return ret, err
}
// This is only allowed as the first argument
i = i + 2
default:
log.Fatalf("unsupported kind %s % #v\n", v.Kind, v)
}
ints[i] = u
}
if ints[0] > 0 {
ret.R = ints[0]
}
if ints[1] > 0 {
ret.G = ints[1]
}
if ints[2] > 0 {
ret.B = ints[2]
}
if ints[3] > 0 {
ret.A = ints[3]
}
return ret, nil
}
func blend(orig image.Image) (m image.Image) {
// deviation range
dev := uint16(50 << 8)
c := new(color.RGBA)
c.A = 255
bounds := orig.Bounds()
// iterations
for i := 0; i < 10; i++ {
newm := image.NewRGBA(bounds)
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
var r, g, b, ct uint32
_r, _g, _b, _ := orig.At(x, y).RGBA()
for i := -1; i < 2; i++ {
for j := -1; j < 2; j++ {
rt, gt, bt, _ := orig.At(x+i, y+j).RGBA()
if uint16(rt-_r) > dev || uint16(gt-_g) > dev || uint16(bt-_b) > dev {
continue
}
r += rt
g += gt
b += bt
ct++
}
}
c.R = uint8((r / ct) >> 8)
c.G = uint8((g / ct) >> 8)
c.B = uint8((b / ct) >> 8)
newm.Set(x, y, c)
}
}
m = newm
}
return
}
func DrawImage(src image.Image, dest draw.Image, tr MatrixTransform, op draw.Op, filter ImageFilter) {
bounds := src.Bounds()
x0, y0, x1, y1 := float64(bounds.Min.X), float64(bounds.Min.Y), float64(bounds.Max.X), float64(bounds.Max.Y)
tr.TransformRectangle(&x0, &y0, &x1, &y1)
var x, y, u, v float64
var c1, c2, cr color.Color
var r, g, b, a, ia, r1, g1, b1, a1, r2, g2, b2, a2 uint32
var color color.RGBA
for x = x0; x < x1; x++ {
for y = y0; y < y1; y++ {
u = x
v = y
tr.InverseTransform(&u, &v)
if bounds.Min.X <= int(u) && bounds.Max.X > int(u) && bounds.Min.Y <= int(v) && bounds.Max.Y > int(v) {
c1 = dest.At(int(x), int(y))
switch filter {
case LinearFilter:
c2 = src.At(int(u), int(v))
case BilinearFilter:
c2 = getColorBilinear(src, u, v)
case BicubicFilter:
c2 = getColorBicubic(src, u, v)
}
switch op {
case draw.Over:
r1, g1, b1, a1 = c1.RGBA()
r2, g2, b2, a2 = c2.RGBA()
ia = M - a2
r = ((r1 * ia) / M) + r2
g = ((g1 * ia) / M) + g2
b = ((b1 * ia) / M) + b2
a = ((a1 * ia) / M) + a2
color.R = uint8(r >> 8)
color.G = uint8(g >> 8)
color.B = uint8(b >> 8)
color.A = uint8(a >> 8)
cr = color
default:
cr = c2
}
dest.Set(int(x), int(y), cr)
}
}
}
}
// linterp performs linear interpolation between the first (p[0]) and
// the last (pal[len(p) - 1]) colors in palette "pal". It fills the
// remaining (pal[1:len(p) - 1]) palette slots with the intepolated
// colors. Colors in slots pal[0] and pal[len(p) - 1] MUST be of type
// color.RGBA. The remaining slots will also be filled with colors of
// type color.RGBA
func linterp(pal color.Palette) {
n := len(pal)
if n <= 2 {
return
}
s, e := pal[0].(color.RGBA), pal[n-1].(color.RGBA)
dr := int(e.R) - int(s.R)
dg := int(e.G) - int(s.G)
db := int(e.B) - int(s.B)
da := int(e.A) - int(s.A)
for i := 1; i < n-1; i++ {
c := color.RGBA{}
c.R = uint8(int(s.R) + i*dr/(n-1))
c.G = uint8(int(s.G) + i*dg/(n-1))
c.B = uint8(int(s.B) + i*db/(n-1))
c.A = uint8(int(s.A) + i*da/(n-1))
pal[i] = c
}
}
func main() {
start := time.Now()
const pictureSize = 5000
img := image.NewRGBA(image.Rect(0, 0, pictureSize, pictureSize))
f, err := os.OpenFile("mandel.png", os.O_WRONLY|os.O_CREATE, 0666)
if err != nil {
fmt.Printf("Can't create picture file\n")
}
deltaX := math.Abs(float64(-2.0-1.0)) / float64(pictureSize)
deltaY := math.Abs(float64(-1.0-1.0)) / float64(pictureSize)
cx := float64(-2.0)
for x := 0; x < pictureSize; x++ {
cx += deltaX
cy := float64(-1.0)
for y := 0; y < pictureSize; y++ {
cy += deltaY
iter := PointIteration(cx, cy, 255.0, 255)
col := color.RGBA{255, iter, iter, iter}
col.A = 255
col.R = iter
col.G = iter
col.B = iter
img.Set(x, y, col)
}
}
w := bufio.NewWriter(f)
png.Encode(w, img)
w.Flush()
fmt.Printf("Seconds needed %d\n", time.Now().Sub(start))
}
func (bilinear) RGBA(src *image.RGBA, x, y float64) color.RGBA {
p := findLinearSrc(src.Bounds(), x, y)
// Array offsets for the surrounding pixels.
off00 := offRGBA(src, p.low.X, p.low.Y)
off01 := offRGBA(src, p.high.X, p.low.Y)
off10 := offRGBA(src, p.low.X, p.high.Y)
off11 := offRGBA(src, p.high.X, p.high.Y)
var fr, fg, fb, fa float64
fr += float64(src.Pix[off00+0]) * p.frac00
fg += float64(src.Pix[off00+1]) * p.frac00
fb += float64(src.Pix[off00+2]) * p.frac00
fa += float64(src.Pix[off00+3]) * p.frac00
fr += float64(src.Pix[off01+0]) * p.frac01
fg += float64(src.Pix[off01+1]) * p.frac01
fb += float64(src.Pix[off01+2]) * p.frac01
fa += float64(src.Pix[off01+3]) * p.frac01
fr += float64(src.Pix[off10+0]) * p.frac10
fg += float64(src.Pix[off10+1]) * p.frac10
fb += float64(src.Pix[off10+2]) * p.frac10
fa += float64(src.Pix[off10+3]) * p.frac10
fr += float64(src.Pix[off11+0]) * p.frac11
fg += float64(src.Pix[off11+1]) * p.frac11
fb += float64(src.Pix[off11+2]) * p.frac11
fa += float64(src.Pix[off11+3]) * p.frac11
var c color.RGBA
c.R = uint8(fr + 0.5)
c.G = uint8(fg + 0.5)
c.B = uint8(fb + 0.5)
c.A = uint8(fa + 0.5)
return c
}
func drawworld2(translate *noise.Translate, w *worldgen2.World, img draw.Image) {
w.Log = false
bounds := img.Bounds()
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
var c color.RGBA
c.A = 255
posx, posy := translate.Into(float64(x), float64(y))
per := w.GetHeight_Island(posx, posy)
if per < 0 {
v := uint8(255 - 127*(-per))
c.R = 0
c.G = 0
c.B = v
} else if per < 0.00002 {
v := uint8(255 - 2550*per)
c.R = v
c.G = v
c.B = 0
} else if per > 0.34 {
v := uint8(220 * (per))
c.R = v
c.G = v
c.B = v
} else {
//v := uint8(255-per*255)
v := uint8(255 - per*300)
c.R = 0
c.G = v
c.B = 0
}
img.Set(x, y, c)
}
}
w.Log = true
}
func (me *renderTile) getSample(x, y, z int, col *color.RGBA) {
if (x >= SceneSize) || (y >= SceneSize) || (z >= SceneSize) {
col.R, col.G, col.B, col.A = 0, 0, 0, 0
} else if colorCube {
if (num.IsEveni(x) && num.IsEveni(y)) || ((z > 0) && num.IsEveni(z)) {
col.R, col.G, col.B, col.A = uint8(x/2), uint8(y/2), uint8(z/2), 255
} else {
col.R, col.G, col.B, col.A = uint8(x), uint8(y), uint8(z), 255
}
} else {
me.voxel = Scene[x][y][z]
if me.voxel.A >= 1 {
if correctAlpha {
me.mixCol(col, &me.voxel, col)
} else {
col.R = mixRGB(col.R, me.voxel.R, col.A, me.voxel.A) // num.Mixb(me.voxel.R, me.voxel.A, col.R)
col.G = mixRGB(col.G, me.voxel.G, col.A, me.voxel.A) // num.Mixb(me.voxel.G, me.voxel.A, col.G)
col.B = mixRGB(col.B, me.voxel.B, col.A, me.voxel.A) // num.Mixb(me.voxel.B, me.voxel.A, col.B)
col.A = mixA(col.A, me.voxel.A) // num.Mixb(1, col.A, me.voxel.A)
}
}
}
}
func main() {
in := flag.String("i", "none", "input file")
out := flag.String("o", "out.png", "output file")
flag.Parse()
if *in == "none" {
return
}
bin := read(*in)
binLength := len(bin)
width := 384
height := len(bin) / width
rect := image.Rect(0, 0, width, height)
img := image.NewRGBA(rect)
p := 0
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
var c color.RGBA
for addr := p; addr < p+3 && addr < binLength; addr++ {
if addr%3 == 0 {
c.R = uint8(bin[addr])
} else if addr%3 == 1 {
c.G = uint8(bin[addr])
} else if addr%3 == 2 {
c.B = uint8(bin[addr])
}
c.A = 0xff
}
p += 3
img.Set(x, y, c)
}
}
f, _ := os.OpenFile(*out, os.O_CREATE|os.O_WRONLY, 0666)
png.Encode(f, img)
}
func featurize(orig image.Image) image.Image {
// deviation range
color_dev := uint16(20 << 8)
feature_dev := 4
bounds := orig.Bounds()
fmt.Println(bounds)
// initialize the array of pixels traversed
ex := make([][]bool, bounds.Max.X+1)
for i := 0; i < bounds.Max.X+1; i++ {
ex[i] = make([]bool, bounds.Max.Y+1)
}
// array of features
// feature is an array of arrays [x,y]
var features [][][2]int
feature_i := 0
// recursively investigate all neighbors of supplied pixel
// and build feature arrays
// some shenanigans to make anonymous functions recurisively callable
var discover func(x int, y int)
discover = func(x int, y int) {
// add this pixel to the current feature
features[feature_i] = append(features[feature_i], [2]int{x, y})
// fmt.Println(x,y)
ex[x][y] = true
// grab the rgb for the supplied pixel
_r, _g, _b, _ := orig.At(x, y).RGBA()
for i := -1; i < 2; i++ {
for j := -1; j < 2; j++ {
xx, yy := x+i, y+j
// check if it's within our bounds and if it's been processed already
if xx < 0 || yy < 0 || xx > bounds.Max.X || yy > bounds.Max.Y || ex[xx][yy] == true {
continue
}
rt, gt, bt, _ := orig.At(xx, yy).RGBA()
// check the color range against our deviation spec
if uint16(rt-_r) > color_dev || uint16(gt-_g) > color_dev || uint16(bt-_b) > color_dev {
continue
}
discover(xx, yy)
}
}
}
// run through each pixel and build features
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
// skip if already processed
if ex[x][y] == true {
continue
}
// fmt.Println(x,y)
features = append(features, [][2]int{})
discover(x, y)
feature_i++
}
}
newm := image.NewRGBA(bounds)
c := new(color.RGBA)
c.A = 255
for f := 0; f < len(features); f++ {
// if the feature is large enough
// average all pixel colors in it
// and set all pixels to that color
if len(features[f]) > feature_dev {
var r, g, b, ct uint64
for p := 0; p < len(features[f]); p++ {
rt, gt, bt, _ := orig.At(features[f][p][0], features[f][p][1]).RGBA()
r += uint64(rt)
g += uint64(gt)
b += uint64(bt)
ct++
}
c.R = uint8((r / ct) >> 8)
c.G = uint8((g / ct) >> 8)
c.B = uint8((b / ct) >> 8)
for p := 0; p < len(features[f]); p++ {
newm.Set(features[f][p][0], features[f][p][1], c)
}
} else {
// write the pixel out as-is
for p := 0; p < len(features[f]); p++ {
r, g, b, _ := orig.At(features[f][p][0], features[f][p][1]).RGBA()
c.R = uint8(r >> 8)
c.G = uint8(g >> 8)
c.B = uint8(b >> 8)
newm.Set(features[f][p][0], features[f][p][1], c)
}
}
}
return newm
}
func main() {
flag.Parse()
// Set initial values.
shades_per_iteration = float64(max_color) / float64(*max_iterations)
var (
mset_x_total float64 = 3.5
mset_y_total float64 = 2.0
)
mset_x_min := *mset_x_ctr - (mset_x_total / 2)
mset_x_max := *mset_x_ctr + (mset_x_total / 2)
mset_y_min := *mset_y_ctr - (mset_y_total / 2)
mset_y_max := *mset_y_ctr + (mset_y_total / 2)
// Set coordinates according to xoom factor.
mset_y_total = (mset_y_max - mset_y_min) / *zoom
mset_x_total = (mset_x_max - mset_x_min) / *zoom
mset_x_min = *mset_x_ctr - (mset_x_total / 2)
mset_x_max = *mset_x_ctr + (mset_x_total / 2)
mset_y_min = *mset_y_ctr - (mset_y_total / 2)
mset_y_max = *mset_y_ctr + (mset_y_total / 2)
mset_ratio := mset_x_total / mset_y_total
img_ratio := float64(*img_width) / float64(*img_height)
if mset_ratio > img_ratio {
// The image is taller than the default mandelbrot set.
// Therefore, the limiting dimension is the height of the mandelbrot set.
// Don't touch the Y figures.
// Reset the X limits.
mset_y_total = mset_y_max - mset_y_min
mset_x_total = mset_y_total * img_ratio
mset_x_min = *mset_x_ctr - (mset_x_total / 2)
mset_x_max = *mset_x_ctr + (mset_x_total / 2)
} else {
// The image is flatter than the default mandelbrot set.
// Therefore, the limiting dimension is the width of the mandelbrot set.
// Don't touch the X figures.
// Reset the Y limits.
mset_x_total = mset_x_max - mset_x_min
mset_y_total = mset_x_total / img_ratio
mset_y_min = *mset_y_ctr - (mset_y_total / 2)
mset_y_max = *mset_y_ctr + (mset_y_total / 2)
}
// Set slope of conversion lines.
// m = rise/run
m_x = mset_x_total / float64(*img_width)
m_y = mset_y_total / float64(*img_height)
b_x = mset_x_min
b_y = mset_y_min
img := image.NewRGBA(image.Rect(0, 0, *img_width, *img_height))
// img := image.NewGray16(image.Rect(0, 0, *img_width, *img_height))
// img := image.NewGray(image.Rect(0, 0, *img_width, *img_height))
var (
c int64
c_max int64 = 0
clr color.RGBA
// clr color.Gray16
// clr color.Gray
// i int64
i_max int64 = 0
mpt MPT
)
// mpt = new(MPT)
for x := 0; x < *img_width; x++ {
log.Printf("Percent Complete: %.1f", float64(x)/float64(*img_width)*100)
for y := 0; y < *img_height; y++ {
x_, y_ := getCoord(x, y)
mpt.X0 = x_
mpt.Y0 = y_
mpt.X = 0
mpt.Y = 0
mpt.N = 0
mpt.iterate()
factor_iterations := float64(mpt.N) / float64(*max_iterations) // This is a decimal revealing the scale based on iterations.
factor_radius := math.Log2(mpt.R) / 2
c = int64((factor_iterations + factor_radius) * float64(*max_iterations) * shades_per_iteration)
// c = max_color - c
clr.G = uint8(c)
clr.B = uint8(c >> 8)
clr.R = uint8(c >> 16)
clr.A = 255
// log.Printf("C: %b\n", c)
// log.Printf("R: %b\n", color.R)
// log.Printf("G: %b\n", color.G)
// log.Printf("B: %b\n", color.B)
// clr.Y = uint8(c)
// The golange image is inverted on the y-axis compared to typical cartesian systems.
img.Set(x, *img_height-y, clr)
}
}
log.Printf("img_width: %d\n", *img_width)
log.Printf("img_height: %d\n", *img_height)
log.Printf("mset_x_min: %0.2f\n", mset_x_min)
log.Printf("mset_x_max: %0.2f\n", mset_x_max)
log.Printf("mset_x_total: %0.2f\n", mset_x_total)
log.Printf("mset_y_min: %0.2f\n", mset_y_min)
log.Printf("mset_y_max: %0.2f\n", mset_y_max)
log.Printf("mset_y_total: %0.2f\n", mset_y_total)
log.Printf("m_x: %0.8f\n", m_x)
log.Printf("m_y: %0.8f\n", m_y)
log.Printf("i_max: %d\n", i_max)
log.Printf("c_max: %d\n", c_max)
log.Println("Encoding image.")
buffer := new(bytes.Buffer)
if err := png.Encode(buffer, img); err != nil {
log.Fatal(err.Error())
}
log.Println("Writing image.")
if err := ioutil.WriteFile(fmt.Sprintf("/Users/jackman/Pictures/mandelbrot(%.4f,%.4f)z%.1f[%dx%dz]x%d.png", *mset_x_ctr, *mset_y_ctr, *zoom, *img_width, *img_height, *max_iterations), buffer.Bytes(), 0644); err != nil {
log.Fatal(err.Error())
}
}
// Find returns the dominant color in img.
func Find(img image.Image) color.RGBA {
// Shrink image for faster processing.
img = resize.Thumbnail(resizeTo, resizeTo, img, resize.NearestNeighbor)
bounds := img.Bounds()
width, height := bounds.Dx(), bounds.Dy()
rnd := rand.New(rand.NewSource(0))
randomPoint := func() (x, y int) {
x = bounds.Min.X + rnd.Intn(width)
y = bounds.Min.Y + rnd.Intn(height)
return
}
// Pick a starting point for each cluster.
clusters := make(kMeanClusterGroup, 0, nCluster)
for i := 0; i < nCluster; i++ {
// Try up to 10 times to find a unique color. If no unique color can be
// found, destroy this cluster.
colorUnique := false
for j := 0; j < maxSample; j++ {
ri, gi, bi, a := img.At(randomPoint()).RGBA()
// Ignore transparent pixels.
if a == 0 {
continue
}
r, g, b := uint8(ri/255), uint8(gi/255), uint8(bi/255)
// Check to see if we have seen this color before.
colorUnique = !clusters.ContainsCentroid(r, g, b)
// If we have a unique color set the center of the cluster to
// that color.
if colorUnique {
c := new(kMeanCluster)
c.SetCentroid(r, g, b)
clusters = append(clusters, c)
break
}
}
if !colorUnique {
break
}
}
convergence := false
for i := 0; i < nIterations && !convergence && len(clusters) != 0; i++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
ri, gi, bi, a := img.At(x, y).RGBA()
// Ignore transparent pixels.
if a == 0 {
continue
}
r, g, b := uint8(ri/255), uint8(gi/255), uint8(bi/255)
// Figure out which cluster this color is closest to in RGB space.
closest := clusters.Closest(r, g, b)
closest.AddPoint(r, g, b)
}
}
// Calculate the new cluster centers and see if we've converged or not.
convergence = true
for _, c := range clusters {
convergence = convergence && c.CompareCentroidWithAggregate()
c.RecomputeCentroid()
}
}
// Sort the clusters by population so we can tell what the most popular
// color is.
sort.Sort(byWeight(clusters))
// Loop through the clusters to figure out which cluster has an appropriate
// color. Skip any that are too bright/dark and go in order of weight.
var col color.RGBA
for i, c := range clusters {
r, g, b := c.Centroid()
// Sum the RGB components to determine if the color is too bright or too dark.
var summedColor uint16 = uint16(r) + uint16(g) + uint16(b)
if summedColor < maxBrightness && summedColor > minDarkness {
// If we found a valid color just set it and break. We don't want to
// check the other ones.
col.R = r
col.G = g
col.B = b
col.A = 0xFF
break
} else if i == 0 {
// We haven't found a valid color, but we are at the first color so
// set the color anyway to make sure we at least have a value here.
col.R = r
col.G = g
col.B = b
col.A = 0xFF
}
}
return col
}
func imgServingExample2(w http.ResponseWriter, r *http.Request) {
c := appengine.NewContext(r)
// prepare a rectangle
var p1, p2 image.Point
p1.X, p1.Y = 10, 10
p2.X, p2.Y = 400, 255
var rec image.Rectangle = image.Rectangle{Min: p1, Max: p2}
// prepare a line color
lineCol := color.RGBA{}
lineCol.R, lineCol.G, lineCol.B = 255, 44, 22
//lineCol.A = 0
c.Infof("brush color %#v \n", lineCol)
// create empty memory image - all pixels are 0 => black
imgRGBA := image.NewRGBA(rec)
for i := 20; i < 140; i++ {
lineCol.A = uint8(i)
imgRGBA.Set(i, i, lineCol)
imgRGBA.Set(i+1, i, lineCol)
imgRGBA.Set(i+2, i, lineCol)
imgRGBA.Set(i+3, i, lineCol)
imgRGBA.Set(i+3, i+1, lineCol)
}
w.Header().Set("Content-Type", "image/jpeg")
jpeg.Encode(w, imgRGBA, &jpeg.Options{Quality: jpeg.DefaultQuality})
}
func init_calc(x, y int) color.RGBA {
//t_ray ray
var x1, y1, z1 float32
var pixel color.RGBA
pixel.R = 255
pixel.A = 255
x1 = float32(D)
y1 = float32((WinX / 2) - x)
z1 = float32((WinY / 2) - y)
/*
ray.Vx = x1 - eye->pos.X;
ray.Vy = y1 - eye->pos.Y;
ray.Vz = z1 - eye->pos.Z;
ray.top_mesh = llist;
ray.top_spot = spot;
ray.bool = 1;
rotate_x(&ray.Vx, &ray.Vy, &ray.Vz, -eye->rot.X);
rotate_y(&ray.Vx, &ray.Vy, &ray.Vz, -eye->rot.Y);
rotate_z(&ray.Vx, &ray.Vy, &ray.Vz, -eye->rot.Z);
color = calc(eye, llist, spot, &ray);
*/
return pixel
}