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

namespace Sketch_dotNet_ArrayList
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{

		ArrayList arrlstSketches = new ArrayList();   // the ArrayList of sketches
		ArrayList arrlstPts;                          // an ArrayList of points for one sketch
		bool btn_Down;

		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
			this.BackColor = SystemColors.Window;
			this.ForeColor = SystemColors.WindowText;

		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		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()
		{
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(292, 273);
			this.Name = "Form1";
			this.Text = "Permanent Sketch with ArrayLists";
			this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseDown);
			this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseUp);
			this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
			this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseMove);

		}
		#endregion

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

		private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			if (e.Button == MouseButtons.Left)
			{
				btn_Down=true;
				arrlstPts = new ArrayList();     // start a new Points arraylist for the new sketch
				arrlstPts.Add(new Point(e.X, e.Y));
			}
		}

		private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			if (btn_Down)
			{
				arrlstPts.Add(new Point(e.X, e.Y));    // add new point to Points arraylist
                Graphics g = CreateGraphics();         // draw segment from next to last to last Point
				g.DrawLine(new Pen(ForeColor), (Point)arrlstPts[arrlstPts.Count - 2], (Point)arrlstPts[arrlstPts.Count - 1]);
				g.Dispose();
			}			
		}

		private void Form1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			if (btn_Down)
			{
				btn_Down = false;
				Point[] apts = (Point[])arrlstPts.ToArray(typeof(Point)); 
					// Convert Points arraylist to an array of points
				arrlstSketches.Add(apts);  
					// add the new Points array to the Sketches arraylist
			}



		}

		private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
		{
			Graphics g = e.Graphics;
			Pen p = new Pen(ForeColor);
			for (int i = 0; i < arrlstSketches.Count; i++)  // index through the arraylist of sketeches
			{                                             
				g.DrawLines(p, (Point[])arrlstSketches[i]); // draw the line segments in each arraylist
			}
		}
	}
}