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

namespace PS6_Q2
{
	//
	// Problem Set 6, Question 2
	// Written by Paul Hudak
	// October 27, 2006
	//
	public class Form1 : System.Windows.Forms.Form
	{
		//
		// Rectangle appears and disappears on mouse clicks.
		// (Problem 16 in Chapter 8.)
		//
		private System.ComponentModel.Container components = null;

		// instance variables to keep track of rectangle
		bool present = false;	// no rectangle to start
		int x;					// x and y coordinates of rectangle
		int y;
		int mx;					// x and y coordinates of mouse
		int my;
		int len = 50;			// length and width of rectangle
		int wid = 25;

		public Form1()
		{
			// Required for Windows Form Designer support
			InitializeComponent();
			Size = new Size(300,300);
			Text = "Magic Rectange";
		}

		protected override void OnPaint(PaintEventArgs e)
		{
			// get handle on graphics window
			Graphics g = e.Graphics;

			if (present)
				g.FillRectangle(Brushes.Blue,x,y,len,wid);
		}

		protected override void OnMouseDown(MouseEventArgs e)
		{
			mx = e.X;
			my = e.Y;
			base.OnMouseDown (e);
		}

		protected override void OnDoubleClick(EventArgs e)
		{
			if (x<mx && mx<x+len && y<my && my<y+wid)
			{
				present = false;
				Invalidate();
			}
			base.OnDoubleClick (e);
		}

		protected override void OnClick(EventArgs e)
		{
			if (!present)
			{
				x = mx - len/2;
				y = my - wid/2;
				present = true;
				Invalidate();
			}
            base.OnClick (e);
		}


		// 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());
		}
	}
}