Data commit

Task/Pentagram/Wren/pentagram.wren

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+import "graphics" for Canvas, Color, Point
+import "dome" for Window
+
+class Game {
+    static init() {
+        Window.title = "Pentagram"
+        var width = 640
+        var height = 640
+        Window.resize(width, height)
+        Canvas.resize(width, height)
+        Canvas.cls(Color.white)
+        var col = Color.hex("#6495ed") // cornflower blue
+        for (i in 1..240) pentagram(320, 320, i, col)
+        for (i in 241..250) pentagram(320, 320, i, Color.black)
+    }
+
+    static update() {}
+
+    static draw(alpha) {}
+
+    static pentagram(x, y, r, col) {
+        var points = List.filled(5, null)
+        for (i in 0..4) {
+            var angle = 2*Num.pi*i/5 - Num.pi/2
+            points[i] = Point.new(x + r*angle.cos, y + r*angle.sin)
+        }
+        var prev = points[0]
+        for (i in 1..5) {
+            var index = (i * 2) % 5
+            var curr = points[index]
+            Canvas.line(prev.x, prev.y, curr.x, curr.y, col)
+            prev = curr
+        }
+    }
+}