h

using System.Drawing;
using System.Windows.Forms;

namespace RedLightGreenLight
{
	public partial class Form1 : Form
	{
		private Label CoordinatesLbl = new Label ();
		private Color NeonRed = Color.FromArgb(221,0,72);
		private Color NeonGreen = Color.FromArgb(57,255,20);
		private Rectangle MyRectangle;
		private int rWidth;
		private int rHeight;
		private bool IsMouseOver;

		public Form1 ()
		{
			InitializeComponent();

			rWidth = 100;
			rHeight = rWidth;
			int centerX = this.Width / 2;
			int centerY = this.Height / 2;
			int xPosition = centerX - (rWidth / 2);
			int yPosition = centerY - (rHeight / 2);

			  MyRectangle = new Rectangle (xPosition, yPosition, rWidth, rHeight);


			IsMouseOver = false;
		}


		private void Form1_Paint(object sender, PaintEventArgs e)
		{
			Graphics g = e.Graphics;
			Brush RedBrush = new SolidBrush(NeonRed);
			Brush GreenBrush = new SolidBrush(NeonGreen);

			if (IsMouseOver) {
				g.FillRectangle (GreenBrush, MyRectangle);
			} else {
				g.FillRectangle (RedBrush, MyRectangle);
			}
		}

		private void Mouse_Move(object sender, MouseEventArgs e) {


			CoordinatesLbl.Text = "X: " + e.X + " Y: " + e.Y;

			bool temp = IsMouseOver;
			IsMouseOver = IsInRectangle (e.X, e.Y);

			if (temp != IsMouseOver)
				this.Invalidate ();

		}

		private void Mouse_Click(object sender, MouseEventArgs e) {
			if (IsInRectangle (e.X, e.Y)) {
				/*DialogResult msg = MessageBox.Show ("Hello!"); */
			}
		}

		private bool IsInRectangle(int x, int y) {
			int Left = MyRectangle.X;
			int Right = MyRectangle.X + MyRectangle.Width;
			int Top = MyRectangle.Y;
			int Bottom = MyRectangle.Y + MyRectangle.Height;

			if (x > Left && x < Right && y < Bottom && y > Top)
				return true;
			else
				return false;
		}
	}
}