Created
January 5, 2020 20:58
-
-
Save dimkouv/2547bd9d7a51130a35075dc44aac2f54 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package main | |
import ( | |
"image" | |
"image/color" | |
"image/png" | |
"math" | |
"math/rand" | |
"os" | |
"time" | |
) | |
func symmetricDraw(img *image.RGBA, offX, offY, x, y int, color color.Color) { | |
pixels := [4][2]int{ | |
{x, y}, {x, -y}, {-x, y}, {-x, -y}, | |
} | |
for _, p := range pixels { | |
img.Set(offX+p[0], offY+p[1], color) | |
} | |
} | |
func drawEllipse(img *image.RGBA, offX, offY, a, b int, color color.Color) { | |
f64a := float64(a) | |
f64b := float64(b) | |
x := 0 | |
y := b | |
d1 := math.Pow(f64b, 2.0) - math.Pow(f64a, 2.0)*f64b + 0.25*math.Pow(f64a, 2.0) | |
symmetricDraw(img, offX, offY, x, y, color) | |
for math.Pow(f64a, 2)*(float64(y)-0.5) > math.Pow(f64b, 2)*float64(x+1) { | |
if d1 < 0 { | |
d1 += math.Pow(f64b, 2) * float64(2*x+3) | |
x++ | |
} else { | |
d1 += math.Pow(f64b, 2)*float64(2*x+3) + math.Pow(f64a, 2)*float64(-2*y+2) | |
x++ | |
y-- | |
} | |
symmetricDraw(img, offX, offY, x, y, color) | |
} | |
d2 := math.Pow(f64b, 2.0)*math.Pow(float64(x)+0.5, 2) + math.Pow(f64a, 2)*math.Pow(float64(y-1), 2) - math.Pow(f64a, 2)*math.Pow(f64b, 2) | |
for y > 0 { | |
if d2 < 0 { | |
d2 += math.Pow(f64b, 2)*float64(2*x+2) + math.Pow(f64a, 2)*float64(-2*y+3) | |
x++ | |
y-- | |
} else { | |
d2 += math.Pow(f64a, 2) * float64(-2*y+3) | |
y-- | |
} | |
symmetricDraw(img, offX, offY, x, y, color) | |
} | |
} | |
func main() { | |
width := 1000 | |
height := 1000 | |
rand.Seed(time.Now().Unix()) | |
black := color.RGBA{0, 0, 0, 0xff} | |
upLeft := image.Point{0, 0} | |
lowRight := image.Point{width, height} | |
img := image.NewRGBA(image.Rectangle{upLeft, lowRight}) | |
for i := 0; i < width; i++ { | |
for j := 0; j < height; j++ { | |
img.Set(i, j, black) | |
} | |
} | |
for i := 0; i < 123; i++ { | |
a := 10 + rand.Intn(70) | |
b := 10 + rand.Intn(70) | |
posX := rand.Intn(1000) | |
posY := rand.Intn(1000) | |
drawEllipse(img, posX, posY, a, b, color.RGBA{ | |
uint8(rand.Intn(256)), uint8(rand.Intn(256)), uint8(rand.Intn(256)), 0xff, | |
}) | |
} | |
f, _ := os.Create("image.png") | |
_ = png.Encode(f, img) | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment