Data commit

Task/Mandelbrot-set/Go/mandelbrot-set-1.go

@@ -0,0 +1,24 @@
+package main
+
+import "fmt"
+import "math/cmplx"
+
+func mandelbrot(a complex128) (z complex128) {
+    for i := 0; i < 50; i++ {
+        z = z*z + a
+    }
+    return
+}
+
+func main() {
+    for y := 1.0; y >= -1.0; y -= 0.05 {
+        for x := -2.0; x <= 0.5; x += 0.0315 {
+            if cmplx.Abs(mandelbrot(complex(x, y))) < 2 {
+                fmt.Print("*")
+            } else {
+                fmt.Print(" ")
+            }
+        }
+        fmt.Println("")
+    }
+}

Task/Mandelbrot-set/Go/mandelbrot-set-2.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+    "fmt"
+    "image"
+    "image/color"
+    "image/draw"
+    "image/png"
+    "math/cmplx"
+    "os"
+)
+
+const (
+    maxEsc = 100
+    rMin   = -2.
+    rMax   = .5
+    iMin   = -1.
+    iMax   = 1.
+    width  = 750
+    red    = 230
+    green  = 235
+    blue   = 255
+)
+
+func mandelbrot(a complex128) float64 {
+    i := 0
+    for z := a; cmplx.Abs(z) < 2 && i < maxEsc; i++ {
+        z = z*z + a
+    }
+    return float64(maxEsc-i) / maxEsc
+}
+
+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)
+    }
+}