Steema Central

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		public Form1()
		{
			InitializeComponent();
			InitializeChart();
		}

		private void InitializeChart()
		{
			Random y = new Random();
			for (int x = 0; x < 50; x++)
			{
				for (int z = 0; z < 2048; z++)
				{
					colorGrid1.Add(x, y.Next(), z);
				}
			}
			//colorGrid1.FillSampleValues();

			Bitmap bmp = tChart1.Bitmap;
			Rectangle Rect = tChart1.Chart.ChartRect;

			rectangleTool1.Shape.CustomPosition = true;
			rectangleTool1.Left = Rect.Left;
			rectangleTool1.Top = Rect.Top;
		}

		private void rectangleTool1_Dragging(object sender, EventArgs e)
		{
			Rectangle Rect = tChart1.Chart.ChartRect;

			if (rectangleTool1.Left < Rect.Left)
			{
				rectangleTool1.Left = Rect.Left;
			}

			if (rectangleTool1.Top < Rect.Top)
			{
				rectangleTool1.Top = Rect.Top;
			}

			if (rectangleTool1.Left + rectangleTool1.Width > Rect.Right)
			{
				rectangleTool1.Left = Rect.Right - rectangleTool1.Width;
			}

			if (rectangleTool1.Top + rectangleTool1.Height > Rect.Bottom)
			{
				rectangleTool1.Top = Rect.Bottom - rectangleTool1.Height;
			}
		}

		private void rectangleTool1_Resizing(object sender, EventArgs e)
		{
			Rectangle Rect = tChart1.Chart.ChartRect;

			if (rectangleTool1.Left < Rect.Left)
			{
				rectangleTool1.Left = Rect.Left;
			}

			if (rectangleTool1.Top < Rect.Top)
			{
				rectangleTool1.Top = Rect.Top;
			}

			if (rectangleTool1.Left + rectangleTool1.Width > Rect.Right)
			{
				rectangleTool1.Width = Rect.Right - rectangleTool1.Left;
			}

			if (rectangleTool1.Top + rectangleTool1.Height > Rect.Bottom)
			{
				rectangleTool1.Height = Rect.Bottom - rectangleTool1.Top;
			}
		}

		private long startTime, now;

		private void tChart1_BeforeDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g)
		{
			startTime = DateTime.Now.Ticks;
		}

		private void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g)
		{
			//calculate elapsed time
			now = DateTime.Now.Ticks;
			TimeSpan elapsedTime = new TimeSpan(now - startTime);

			label1.Text = "Elapsed time: " + elapsedTime.TotalMilliseconds.ToString() + " ms";
		}