Initial data commit

Task/Superellipse/Go/superellipse.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+    "github.com/fogleman/gg"
+    "math"
+)
+
+/* assumes a and b are always equal */
+func superEllipse(dc *gg.Context, n float64, a int) {
+    hw := float64(dc.Width() / 2)
+    hh := float64(dc.Height() / 2)
+
+    // calculate y for each x
+    y := make([]float64, a+1)
+    for x := 0; x <= a; x++ {
+        aa := math.Pow(float64(a), n)
+        xx := math.Pow(float64(x), n)
+        y[x] = math.Pow(aa-xx, 1.0/n)
+    }
+
+    // draw quadrants
+    for x := a; x >= 0; x-- {
+        dc.LineTo(hw+float64(x), hh-y[x])
+    }
+    for x := 0; x <= a; x++ {
+        dc.LineTo(hw+float64(x), hh+y[x])
+    }
+    for x := a; x >= 0; x-- {
+        dc.LineTo(hw-float64(x), hh+y[x])
+    }
+    for x := 0; x <= a; x++ {
+        dc.LineTo(hw-float64(x), hh-y[x])
+    }
+
+    dc.SetRGB(1, 1, 1) // white ellipse
+    dc.Fill()
+}
+
+func main() {
+    dc := gg.NewContext(500, 500)
+    dc.SetRGB(0, 0, 0) // black background
+    dc.Clear()
+    superEllipse(dc, 2.5, 200)
+    dc.SavePNG("superellipse.png")
+}