using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Threading;

namespace PS6_Q3
{
	//
	// Problem Set 6, Question 3
	// Written by Paul Hudak
	// October 27, 2006
	//
	public class Form1 : System.Windows.Forms.Form
	{
		//
		// Program to generate a fractal snowflake
		//
		private System.ComponentModel.Container components = null;

		// create a pallette (an array) of colors
		private Brush[] colors = { Brushes.Magenta, Brushes.Blue,
								   Brushes.Green, Brushes.Yellow, Brushes.Red };

		public Form1()
		{
			// Required for Windows Form Designer support
			InitializeComponent();
			// set window size and label
			Size = new Size(1020,1100);
			Text = "Fractal Snowflake";
			// looks better with black background
			BackColor = Color.Black;
		}

		protected override void OnPaint(PaintEventArgs e)
		{
			// get handle on graphics window
			Graphics g = e.Graphics;
			int m = 2*81;		// a power of 3 for triangle size
			int x = 500;        // x and y coordinates of
			int y = 500;		//   center of snowflake

			DrawTri(g, x, y, m, 0, false);  // draw first triangle w/flat top
			Flake  (g, x, y, m, 0, true);   // begin recursion to complete job

		}

		public void DrawTri(Graphics g, int x, int y, int m, int c, bool o)
		{
			int d = (3*m)/2;
			if (o)
			{	// horizontal side at bottom
				Point[] vertices = {new Point(x,y-3*m), new Point(x-3*m,y+d), new Point(x+3*m,y+d)};
				g.FillPolygon(colors[c],vertices);
			}
			else
			{	// horizontal side at top
				Point[] vertices = {new Point(x,y+3*m),	new Point(x-3*m,y-d), new Point(x+3*m,y-d)};
				g.FillPolygon(colors[c],vertices);
			}
			// Thread.Sleep(20);
			/*	The above vertices are based on the following "base case":
					       (3,0)
					(0,1.5)     (6,1.5)
					       (3,3)
					(0,4.5)     (6,4.5)
					       (3,6)
			*/
		}

		// draw snowflake at center (x,y), size m, and orientation o
		public void Flake(Graphics g, int x, int y, int m, int c, bool o)
		{
			DrawTri(g, x, y, m, c, o);  // draw second triangle
			int c1 = (c+1)%5;			// compute next color index
			int m1 = m/3;				// compute next size
			if (m1>0)					// if too small, we're done
			{
				Flake(g, x-2*m, y-m, m1, c1, true);  // NW flat bottom
				Flake(g, x+2*m, y-m, m1, c1, true);  // NE flat bottom
				Flake(g, x,   y+2*m, m1, c1, true);  // S  flat bottom
				Flake(g, x-2*m, y+m, m1, c1, false); // SW flat top
				Flake(g, x+2*m, y+m, m1, c1, false); // SE flat top
				Flake(g, x,   y-2*m, m1, c1, false); // N  flat top
			};
			/*	The above coordinates are based on the following "base case",
				where each point is the center of a cluster:
						   (3,1)
					 (1,2)       (5,2)
						   (3,3)
					 (1,4)       (5,4)
						   (3,5)
			*/
		}

		// Clean up any resources being used.
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			this.Size = new System.Drawing.Size(300,300);
			this.Text = "Form1";
		}
		#endregion

		// The main entry point for the application.
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}
	}
}