protected override void OnRender(ChartControl chartControl, ChartScale chartScale)
{
  // Store the beginning and ending x-coordinates of the canvas area
  double canvasBeginCoordinate = chartControl.CanvasLeft;
  double canvasEndCoordinate = chartControl.CanvasRight;
 
  // Print the stored values
  Print(String.Format("Chart canvas begins at x-coordinate {0} and ends at x-coordinate {1}", canvasBeginCoordinate, canvasEndCoordinate));
}