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

namespace PS9_Q1
{
	//
	// Problem Set 9
	// Written by Paul Hudak
	// November 28, 2006
	//
	public class Form1 : System.Windows.Forms.Form
	{
		private System.ComponentModel.Container components = null;

		// instance variables
		private int x, y;						// position of ball
		private int dx=3, dy=4;					// controls velocity of ball
		private const int initdx=3, initdy=4;	// initial velocity of ball
		private int score = 0;					// player's score

		// Suspend, Resume, Abort, and Reset buttons
		private Button suspend = new Button();	
		private Button resume  = new Button();
		private Button abort   = new Button();
		private Button reset   = new Button();

		// Display for score
		private Label display  = new Label();
		private Pen black      = new Pen(Color.Black, 2);

		// Random number generator and animation thread
		private Random r       = new Random();
		Thread t;

		public Form1()
		{
			InitializeComponent();

			// initialize the Form
			// BackColor = Color.White;					// I don't like the white background
			Size = new Size(400,600);
			Text = "My Very Own Video Game";
			SetStyle(ControlStyles.DoubleBuffer |		// use double-buffering
				ControlStyles.AllPaintingInWmPaint | 
				ControlStyles.UserPaint, true);


			// initialize the button and display text
			abort.Text   = "Abort";
			suspend.Text = "Suspend";
			resume.Text  = "Resume";
			reset.Text   = "Reset";
			display.TextAlign   = ContentAlignment.MiddleCenter;
			display.BorderStyle = BorderStyle.Fixed3D;
			display.Size        = new Size(100,75);
			display.Font        = new Font("Comic Sans MS", 20, FontStyle.Bold);
			display.Text        = score.ToString();

			// set component locations
			suspend.Location = new Point(35,450);
			resume.Location  = new Point(35,500);
			abort.Location   = new Point(280,450);
			reset.Location   = new Point(280,500);
			display.Location = new Point(145,450);

			// register event handlers
			abort.Click   += new EventHandler(Abort_Click);
			suspend.Click += new EventHandler(Suspend_Click);
			resume.Click  += new EventHandler(Resume_Click);
			reset.Click   += new EventHandler(Reset_Click);
		
			// add controls to Form
			Controls.Add(suspend);
			Controls.Add(resume);
			Controls.Add(abort);
			Controls.Add(reset);
			Controls.Add(display);
			
			// initialize instance variables
			x = 100; y = 100;						// initial position of ball
			t = new Thread(new ThreadStart(Run));	// create thread
			t.Start();								// enable thread to run
		}

		// three of the button event handlers are the same except 
		//	  for the operation to be performed
		protected void Abort_Click(object sender, EventArgs e)
		{
			try	{ t.Abort(); }
			catch {	}
		}
		protected void Suspend_Click(object sender, EventArgs e)
		{
			try	{ t.Suspend(); }
			catch {	}
		}
		protected void Resume_Click(object sender, EventArgs e)
		{
			try	{ t.Resume(); }
			catch {	}
		}
		// reset event hanlder is more complex
		protected void Reset_Click(object sender, EventArgs e)
		{	// reset score and "harder" count
			score  = 0;	
			display.Text = score.ToString();
			// randomly create new position and direction of motion
			x = r.Next(350);
			y = r.Next(350);
            dx = (r.Next(2)==1) ? initdx : -initdx;
			dy = (r.Next(2)==1) ? initdy : -initdy;
		}

		// mouse clicks update the score if they are a "hit"
		protected override void OnMouseDown(MouseEventArgs e)
		{
			int delx = e.X - x - 20;
			int dely = e.Y - y - 20;
			if (delx*delx + dely*dely <= 400)		// 400 = ball-radius squared
			{	// if a "hit", then update score
				score = score+1;
				display.Text = score.ToString();
				// every five hits, increase ball speed
				if (score%5 == 0)
				{
					dx = (dx<0) ? dx-1 : dx+1;
					dy = (dy<0) ? dy-1 : dy+1;
				}
			}
		}

		protected override void OnPaint(PaintEventArgs e)
		{	// draw line and ball
			Graphics g = e.Graphics;
			g.FillEllipse(Brushes.Red, x, y, 40, 40);
			g.DrawLine(black, 0, 400, 400, 400);
			base.OnPaint(e);
		}

		public void Run()
		{	// infinite loop to update instance variables that
			//	  keep track of ball location
			while (true)
			{
				x += dx;
				y += dy;
				if (x<0 || x>350) dx = -dx;		// hit a vertical wall
				if (y<0 || y>360) dy = -dy;		// hit a horizontal wall
				Invalidate();
				Thread.Sleep(40);
			}
		}

        //
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			t.Abort();					// kill running thread when app terminates
			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

		//
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}
	}
}