Charts use point indices for XValues

sjmilessjmiles
edited 6:45AM in FastReport 3.0
It seems that report charts use data point indices instead of the dataset values for the XValues of the chart. The dataset values are stored only as labels.

For example, if you chart the following data:

1 100
10 150
11 200

You get a chart like so:

1 100 (labeled "1")
2 150 (labeled "10")
3 200 (labeled "11")

In other words, I expect the second point to be 9 units away on the X axis from the first point, but it is shown only 1 unit away.

Under these conditions, (1) only linear data (evenly spaced points) can be charted and (2) you cannot overlay two data streams unless the number of points and the spacing is identical.

Am I simply missing an option somewhere?

Comments

  • sjmilessjmiles
    edited 6:45AM
    Note, the following change to the source resolves this problem:

    in: 
    procedure TfrxSeriesItem.FillSeries(Series: TChartSeries);
    changing: 
    for i := 0 to slx.Count - 1 do
  if frxIsValidFloat(sly[i]) then
    Series.Add(frxStrToFloat(sly[i]), slx[i], clTeeColor);
    to: 
    for i := 0 to slx.Count - 1 do
  if frxIsValidFloat(sly[i]) then
    if frxIsValidFloat(slx[i]) then
      Series.AddXY(frxStrToFloat(slx[i]), frxStrToFloat(sly[i]), slx[i], clTeeColor)
    else
      Series.Add(frxStrToFloat(sly[i]), slx[i], clTeeColor);
    Allows XValues to be used by the TChart axis mechanisms.

    Note: I didn't test it with all possible series types. If there is a problem, there might need to be an option for using AddXY vs Add.

    Is there a process for submitting proposed code changes to the developers?

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