Data commit

Task/Polyspiral/C-sharp/polyspiral.cs

@@ -0,0 +1,63 @@
+using System;
+using System.Drawing;
+using System.Drawing.Drawing2D;
+using System.Windows.Forms;
+using System.Windows.Threading;
+
+namespace Polyspiral
+{
+    public partial class Form1 : Form
+    {
+        private double inc;
+
+        public Form1()
+        {
+            Width = Height = 640;
+            StartPosition = FormStartPosition.CenterScreen;
+            SetStyle(
+                ControlStyles.AllPaintingInWmPaint |
+                ControlStyles.UserPaint |
+                ControlStyles.DoubleBuffer,
+                true);
+
+            var timer = new DispatcherTimer();
+            timer.Tick += (s, e) => { inc = (inc + 0.05) % 360; Refresh(); };
+            timer.Interval = new TimeSpan(0, 0, 0, 0, 40);
+            timer.Start();
+        }
+
+        private void DrawSpiral(Graphics g, int len, double angleIncrement)
+        {
+            double x1 = Width / 2;
+            double y1 = Height / 2;
+            double angle = angleIncrement;
+
+            for (int i = 0; i < 150; i++)
+            {
+                double x2 = x1 + Math.Cos(angle) * len;
+                double y2 = y1 - Math.Sin(angle) * len;
+                g.DrawLine(Pens.Blue, (int)x1, (int)y1, (int)x2, (int)y2);
+                x1 = x2;
+                y1 = y2;
+
+                len += 3;
+
+                angle = (angle + angleIncrement) % (Math.PI * 2);
+            }
+        }
+
+        protected override void OnPaint(PaintEventArgs args)
+        {
+            var g = args.Graphics;
+            g.SmoothingMode = SmoothingMode.AntiAlias;
+            g.Clear(Color.White);
+
+            DrawSpiral(g, 5, ToRadians(inc));
+        }
+
+        private double ToRadians(double angle)
+        {
+            return Math.PI * angle / 180.0;
+        }
+    }
+}