Anonymous

using System;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Windows.Forms;



namespace Clipper

{

	public class MainForm : System.Windows.Forms.Form

	{

		public MainForm()

		{

			InitializeComponent();

			

			TestControl tc = new TestControl();

			tc.Dock = DockStyle.Fill;

			

			Controls.Add(tc);

		}

		

		[STAThread]

		public static void Main(string[] args)

		{

			Application.Run(new MainForm());

		}

		

		#region Windows Forms Designer generated code

		private void InitializeComponent() {

			// 

			// MainForm

			// 

			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);

			this.ClientSize = new System.Drawing.Size(752, 493);

			this.Name = "MainForm";

			this.Text = "MainForm";

		}

		#endregion

	}

	

	public class TestControl : Control {

		const int count = 180;

		Rectangle[] rects = new Rectangle[count];

		

		public TestControl ()

		{

			int x_pos = 10;

			int y_pos = 10;

			for (int i = 0; i < count; i++) {

				rects[i] = new Rectangle(x_pos, y_pos, 30, 30);

				y_pos += 40;

				

				if (y_pos > 450) {

					y_pos = 10;

					x_pos += 40;

				}

			}

			

			SetStyle (ControlStyles.DoubleBuffer, true);

		}

		

		protected override void OnPaint(PaintEventArgs e)

		{

			Console.WriteLine("ClipRectangle: " + e.ClipRectangle);

			

			int counter = 0;

			

			for (int i = 0; i < count; i++) {

				if (e.ClipRectangle.IntersectsWith(rects[i])) {

					counter ++;

					LinearGradientBrush lgbr =

						new LinearGradientBrush(new Point(rects[i].X, rects[i].Y),

						                        new Point(rects[i].X, rects[i].Bottom),

						                        Color.Blue, Color.Black);

					

					e.Graphics.FillRectangle(lgbr, rects[i]);

				}

			}

			

			Console.WriteLine("{0} gradients were drawn", counter);

		}

	}

}