Initial data commit

Task/Pentagram/Go/pentagram.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+    "github.com/fogleman/gg"
+    "math"
+)
+
+func Pentagram(x, y, r float64) []gg.Point {
+    points := make([]gg.Point, 5)
+    for i := 0; i < 5; i++ {
+        fi := float64(i)
+        angle := 2*math.Pi*fi/5 - math.Pi/2
+        points[i] = gg.Point{x + r*math.Cos(angle), y + r*math.Sin(angle)}
+    }
+    return points
+}
+
+func main() {
+    points := Pentagram(320, 320, 250)
+    dc := gg.NewContext(640, 640)
+    dc.SetRGB(1, 1, 1) // White
+    dc.Clear()
+    for i := 0; i <= 5; i++ {
+        index := (i * 2) % 5
+        p := points[index]
+        dc.LineTo(p.X, p.Y)
+    }
+    dc.SetHexColor("#6495ED") // Cornflower Blue
+    dc.SetFillRule(gg.FillRuleWinding)
+    dc.FillPreserve()
+    dc.SetRGB(0, 0, 0) // Black
+    dc.SetLineWidth(5)
+    dc.Stroke()
+    dc.SavePNG("pentagram.png")
+}