Steema Central

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        //Event to make the series visible or invisible
        void _TagInfo_OnVisibleStateChanged(object sender, bool visible)
        {
            TagInfo _TagInfo = sender as TagInfo;
            TeeChart.Series.WithTitle(_TagInfo.TagName).Visible = visible;
            TeeChart.Refresh(); //this call is also very costly. But to call the 
                                           //BeforeDrawSeries event i need to call this function. Is it right?
        }

        private void TeeChart_BeforeDrawSeries(object sender, Graphics3D g)
        {
            //Draw circles between the Null Value ranges in each of the series
            if (this.TeeChart.Series.Count > 0)
            {
                foreach (Series _Series in TeeChart.Series)
                {
                    if (_Series.Visible)
                        DrawCircle(g);
                }
            }
        }

      private void DrawCircle(Graphics3D GraphObj)
        {
            //Get the TagInfo of the series
            foreach (Series _Series in TeeChart.Series)
            {
                TagInfo _TagInfo = _TrendService.TrendManager.TagInfos[_Series.Title];

                //Iterate through the Null indexes instead of the whole data to get the points 
                //for drawing the circle
                for (int i = 0; i < _TagInfo.NullIndexes.Count; i++)
                {
                  int _PtXPos = -1;
                  int _PtYPos = -1;
                  Color PtColor;                    //Point Color
                  double xPtVal = -1;
                  double yPtVal = -1;
                  int _CurrentmiSeriesIndex = _TagInfo.NullIndexes[i];

                  if (_CurrentmiSeriesIndex > 0)
                  {
                    if (!_Series.IsNull(_TagInfo.NullIndexes[i] - 1))
                    {

                      xPtVal = _Series[_CurrentmiSeriesIndex - 1].X;
                      yPtVal = _Series[_CurrentmiSeriesIndex - 1].Y;

                      _PtXPos = _Series.CalcXPosValue(xPtVal);
                      _PtYPos = _Series.CalcYPosValue(yPtVal);

                    }

                    PtColor = _Series.Color;
                    //Paint the circle
                    PaintCircle(GraphObj, _PtXPos, _PtYPos, PtColor);
                  }
                  else if (_CurrentmiSeriesIndex < 0) continue;

                  if (_CurrentmiSeriesIndex + 1 == _Series.Count)
                    continue;
                  if (!_Series.IsNull(_CurrentmiSeriesIndex + 1))
                  {
                    xPtVal = _Series[_CurrentmiSeriesIndex + 1].X;
                    yPtVal = _Series[_CurrentmiSeriesIndex + 1].Y;

                    _PtXPos = _Series.CalcXPosValue(xPtVal);
                    _PtYPos = _Series.CalcYPosValue(yPtVal);

                    PtColor = _Series.Color;
                    GraphObj.Pen.Style = System.Drawing.Drawing2D.DashStyle.Solid;
                    GraphObj.Pen.Transparency = 0;
                    PaintCircle(GraphObj, _PtXPos, _PtYPos, PtColor);
                  }
                }
            }
        }

        private void PaintCircle(Graphics3D GraphObj, int xPos, int yPos, Color PtColor)
        {
            GraphObj.Brush.Color = PtColor;
            GraphObj.Brush.Transparency = 100;

            TeeChart.Canvas.Pen.Color = PtColor;
            TeeChart.Canvas.Pen.Width = 1;

            //Subtrating by radius of the circle
            GraphObj.Ellipse(new Rectangle(xPos - 3, yPos - 3, 6, 6));
        }

Code: Select all

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

		private void InitializeChart()
		{
			tChart1.Aspect.View3D = false;
			tChart1.Legend.CheckBoxes = true;

			for (int i = 0; i < 5; i++)
			{
				Steema.TeeChart.Styles.Line line1 = new Steema.TeeChart.Styles.Line(tChart1.Chart);
				line1.FillSampleValues();
			}

			tChart1.BeforeDrawSeries += new Steema.TeeChart.PaintChartEventHandler(tChart1_BeforeDrawSeries);
		}

		void tChart1_BeforeDrawSeries(object sender, Steema.TeeChart.Drawing.Graphics3D g)
		{
			DrawCircles();
		}

		private void DrawCircles()
		{
			foreach (Steema.TeeChart.Styles.Series s in tChart1.Series)
			{
				if (s.Visible)
				{
					for (int i = 0; i < s.Count; i++)
					{
						int x = s.CalcXPos(i);
						int y = s.CalcYPos(i);
						tChart1.Graphics3D.Ellipse(x-3, y-3, x+3, y+3);
					}
				}
			}
		}