Data commit

Task/Koch-curve/Go/koch-curve.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+    "github.com/fogleman/gg"
+    "math"
+)
+
+var dc = gg.NewContext(512, 512)
+
+func koch(x1, y1, x2, y2 float64, iter int) {
+    angle := math.Pi / 3 // 60 degrees
+    x3 := (x1*2 + x2) / 3
+    y3 := (y1*2 + y2) / 3
+    x4 := (x1 + x2*2) / 3
+    y4 := (y1 + y2*2) / 3
+    x5 := x3 + (x4-x3)*math.Cos(angle) + (y4-y3)*math.Sin(angle)
+    y5 := y3 - (x4-x3)*math.Sin(angle) + (y4-y3)*math.Cos(angle)
+    if iter > 0 {
+        iter--
+        koch(x1, y1, x3, y3, iter)
+        koch(x3, y3, x5, y5, iter)
+        koch(x5, y5, x4, y4, iter)
+        koch(x4, y4, x2, y2, iter)
+    } else {
+        dc.LineTo(x1, y1)
+        dc.LineTo(x3, y3)
+        dc.LineTo(x5, y5)
+        dc.LineTo(x4, y4)
+        dc.LineTo(x2, y2)
+    }
+}
+
+func main() {
+    dc.SetRGB(1, 1, 1) // White background
+    dc.Clear()
+    koch(100, 100, 400, 400, 4)
+    dc.SetRGB(0, 0, 1) // Blue curve
+    dc.SetLineWidth(2)
+    dc.Stroke()
+    dc.SavePNG("koch.png")
+}