Data commit

Task/Dragon-curve/C-sharp/dragon-curve.cs

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+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Drawing.Drawing2D;
+using System.Windows.Forms;
+
+public class DragonCurve : Form
+{
+    private List<int> turns;
+    private double startingAngle, side;
+
+    public DragonCurve(int iter)
+    {
+        Size = new Size(800, 600);
+        StartPosition = FormStartPosition.CenterScreen;
+        DoubleBuffered = true;
+        BackColor = Color.White;
+
+        startingAngle = -iter * (Math.PI / 4);
+        side = 400 / Math.Pow(2, iter / 2.0);
+
+        turns = getSequence(iter);
+    }
+
+    private List<int> getSequence(int iter)
+    {
+        var turnSequence = new List<int>();
+        for (int i = 0; i < iter; i++)
+        {
+            var copy = new List<int>(turnSequence);
+            copy.Reverse();
+            turnSequence.Add(1);
+            foreach (int turn in copy)
+            {
+                turnSequence.Add(-turn);
+            }
+        }
+        return turnSequence;
+    }
+
+    protected override void OnPaint(PaintEventArgs e)
+    {
+        base.OnPaint(e);
+        e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
+
+        double angle = startingAngle;
+        int x1 = 230, y1 = 350;
+        int x2 = x1 + (int)(Math.Cos(angle) * side);
+        int y2 = y1 + (int)(Math.Sin(angle) * side);
+        e.Graphics.DrawLine(Pens.Black, x1, y1, x2, y2);
+        x1 = x2;
+        y1 = y2;
+        foreach (int turn in turns)
+        {
+            angle += turn * (Math.PI / 2);
+            x2 = x1 + (int)(Math.Cos(angle) * side);
+            y2 = y1 + (int)(Math.Sin(angle) * side);
+            e.Graphics.DrawLine(Pens.Black, x1, y1, x2, y2);
+            x1 = x2;
+            y1 = y2;
+        }
+    }
+
+    [STAThread]
+    static void Main()
+    {
+        Application.Run(new DragonCurve(14));
+    }
+}