Converting Series type Line to Area

[Quant]

While converting Series type Line to Area I am getting
"System.NullReferenceException - Object reference not set to an instance of an object."

I used following code.

Code: Select all

                Steema.TeeChart.Styles.Series tSeries = tChartMain[0];
                Steema.TeeChart.Styles.Series.ChangeType(ref tSeries, typeof(Steema.TeeChart.Styles.Area));
                Steema.TeeChart.Styles.Area tArea = (Steema.TeeChart.Styles.Area)tChartMain.Series[0];

Kindly Help in resolving this issue.

[Narcís]

Hello Quant,

This is a bug which I have added to our bug tracking system (ID1109). I also fixed it for the next maintenance release. In the meantime you can do something like this:

Code: Select all

      tChart1.Series.Add(new Steema.TeeChart.Styles.Line()).FillSampleValues();

      Steema.TeeChart.Styles.Series tSeries = tChart1[0];
      //Steema.TeeChart.Styles.Series.ChangeType(ref tSeries, typeof(Steema.TeeChart.Styles.Area));
      Steema.TeeChart.Styles.Area tArea = new Steema.TeeChart.Styles.Area(tChart1.Chart);
      tArea.DataSource = tSeries;
      tArea.Color = tSeries.Color;
      tArea.LinePen.Color = (tChart1[0] as Steema.TeeChart.Styles.Line).LinePen.Color;
      tArea.AreaLines.Color = tArea.LinePen.Color;

      tChart1.Series.Remove(tSeries);

[Quant]

Thank you for your reply and workaround.
The Bugzilla link provided by you is showing the status RESOLVED FIXED.
Kindly send me the new solution.

[Narcís]

Hello Quant,

I see you are a source code customer. In that case you should add the code snippet below at the private void Steema.TeeChart.Styles.Custom.DrawArea(Color BrushColor, int x, int y, int valueIndex) method in Custom.cs

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      if (bAreaBrush == null)
      {
        bAreaBrush = new ChartBrush();
      }

This should be added below those lines:

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      Graphics3D g = chart.graphics3D;
      bool oldBrushVisible = false;

Something like this:

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      Graphics3D g = chart.graphics3D;
      bool oldBrushVisible = false;

      if (bAreaBrush == null)
      {
        bAreaBrush = new ChartBrush();
      }

      if (ColorEach)
      {
        //code continues here

[Quant]

Now getting same error Object reference not set to an instance of an object.
on line no. 3548 that is

Code: Select all

 oldPenColor = pAreaLines.Color;

which is in DrawPoint() Method of Custom.cs

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       if (drawArea)
        {
          Color tmp = GetAreaBrushColor(tmpColor);
          oldPenColor = pAreaLines.Color;

          if (pAreaLines.Visible)
          {
            if (ColorEach)
            {
              pAreaLines.Color = Utils.DarkenColor(tmp, 60);
            }
          }
          else
          {
            pAreaLines.Color = tmp;
          }

          g.Pen = pAreaLines;

          DrawArea(tmp, x, y, valueIndex);

          pAreaLines.Color = oldPenColor;
        }

[Narcís]

Hello Quant,

Does it occur running the same code I added at bugzilla?

Code: Select all

      tChart1.Series.Add(new Steema.TeeChart.Styles.Line()).FillSampleValues();

      Steema.TeeChart.Styles.Series tSeries = tChart1[0];
      Steema.TeeChart.Styles.Series.ChangeType(ref tSeries, typeof(Steema.TeeChart.Styles.Area));

That being the case you might need more changes that have been implemented at our internal sources since the last maintenance release and you should wait for the next one.

Otherwise, please send us a simple code snippet we can run "as-is" to reproduce the problem here.

Thanks in advance.

[Narcís]

Hello Quant,

That being the case you might need more changes that have been implemented at our internal sources since the last maintenance release

You could also check if pAreaLines is being initialized at AreaLines property in Area.cs, for example:

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public ChartPen AreaLines 
{
	get
	{        
		if (pAreaLines == null) pAreaLines = new ChartPen(chart, Color.Black);

		return pAreaLines; 
	}
}