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A question about X axis.


kelvin79
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I am using ChartFX 6.2 for .NET to display my data.  But I meet a serious problem.

That is ChartFX seems use the first series I add to setup X axis. If the following series have more points than the first one, they will not be rightly displayed.

for example, I have 4 series, the first and the third one have 201 points and the others have 1539 points. The x value range of shorter series are from 0 to

8000 and the other two is from 0 to 12500. When I use OpenData to add them to ChartFX, the values from 8000 to 12500 could not be rightly displayed.

And the last X axis label is 8000.

The following is my codes

  int seriesNum = 4;

  double[][] xData = new double[seriesNum][];

  double[][] yData = new double[seriesNum][];

  xData[0] = m_DataSource.GetXData(0);

  yData[0] = m_DataSource.GetYData(0);

  xData[1] = m_DataSource.GetXData(1);

  yData[1] = m_DataSource.GetYData(1);

  xData[2] = m_DataSource.GetXData(2);

  yData[2] = m_DataSource.GetYData(2);

  xData[3] = m_DataSource.GetXData(3);

  yData[3] = m_DataSource.GetYData(3);

  int maxPointNum = 0;

  for (int i = 0; i < seriesNum; i++)

  {

  if (xData != null)

  {

  maxPointNum = Math.Max(maxPointNum, xData.Length);

  }

  }

  m_Chart.OpenData(COD.Values, seriesNum, maxPointNum);

  m_Chart.OpenData(COD.XValues, seriesNum, maxPointNum);

  //

  ChartDataObj chartValue = m_Chart.Value;

  ChartDataObj chartXValue = m_Chart.XValue;

  //

  for (int j = 0; j < seriesNum; j++)

  {

  if (xData[j] == null)

  continue;

  for(int i = 0; i < xData[j].Length; i++)

  {

  chartXValue[j, i] = xData[j];

  chartValue[j, i] = yData[j];

  }

  }

  //

  m_Chart.CloseData(COD.XValues);

  m_Chart.CloseData(COD.Values);

  m_Chart.Series[0].Gallery = Gallery.Scatter;

  m_Chart.Series[0].Color = Color.Red;

  m_Chart.Series[1].Gallery = Gallery.Lines;

  m_Chart.Series[1].Color = Color.Red;

  m_Chart.Series[2].Gallery = Gallery.Scatter;

  m_Chart.Series[2].Color = Color.Blue;

  m_Chart.Series[3].Gallery = Gallery.Lines;

  m_Chart.Series[3].Color = Color.Blue;

 Is there something wrong? I have checked the x and y data have no problem.

And how ChartFX setups X and Y axis according to the data automatically?

 

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All series have the same amount of points (maxPointNum).

The X-Axis should be adjusted to the Min and Max value of all series.

Replacing the protion of your code that deals with your data (which I don't have) with the following code renders correctly:

xData[0] = new double [] {0,100,8000};

yData[0] =

new double [] {50,100,60};xData[1] = new double [] {0,100,8000};

yData[1] =

new double [] {50,100,60};xData[2] = new double [] {0,100,8000,12500};

yData[2] =

new double [] {50,100,60,80};xData[3] = new double [] {0,100,8000,12500};

yData[3] =

new double [] {50,100,60,80};

 Notice that 12500 may not be displaying as a label at the end of the X-Axis simply because the Step chosen is not a multiple of 12500, that doesn't mean the Axis Max is not 12500. Do you see the data at 12500 or is it clipped?

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Thank you very much for your quick reply.

>All series have the same amount of points (maxPointNum).

Is that means I should allocate space to make all my series have the same length, using Chart.Hidden to fill the empty points? ChartFX don't do that for me?

I understand why 12500 may not be the last label of x axis, but my problem is actually that the last scale of x axis being wiredrawed very long. The label of 

scale beginning is 8000 and the ending is 8000,too. The data between 8000 to 1250 is displayed in this long scale. Perhaps I need to give a screen snap

shot tomorrow. It seems ChartFX only use the first series's X value to calculate Max and Min value. I must make some mistakes, but I can't find where...

 In addition, I met the same problem when I use ListProvider to populate data ...

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