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@mdales mdales/mandiserver.go
Last active Jul 23, 2017

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package main
import (
"image"
"image/color"
"image/png"
"math/cmplx"
"log"
"net/http"
)
func main() {
http.HandleFunc("/", handler)
log.Fatal(http.ListenAndServe("localhost:8000", nil))
}
func handler(w http.ResponseWriter, r *http.Request) {
const (
xmin, ymin, xmax, ymax = -2, -2, +2, +2
width, height = 1024, 1024
)
img := image.NewRGBA(image.Rect(0, 0, width, height))
for py := 0; py < height; py++ {
y := float64(py) / height * (ymax - ymin) + ymin
for px := 0; px < width; px++ {
x := float64(px) / width * (xmax - xmin) + xmin
z := complex(x, y)
img.Set(px, py, mandlebrot(z))
}
}
png.Encode(w, img)
}
func mandlebrot(z complex128) color.Color {
const iterations = 200
const contrast = 15
var v complex128
for n := uint8(0); n < iterations; n++ {
v = v * v + z
if cmplx.Abs(v) > 2 {
return color.Gray{255 - contrast * n}
}
}
return color.Black
}
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