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V25.1
  • TdxChartBarSeriesPointDrawParameters Class

    Stores series point draw settings in a Bar series View.

    Declaration

    TdxChartBarSeriesPointDrawParameters = class(
        TdxChartSeriesPointDrawParameters
    )

    Remarks

    The TdxChartBarSeriesPointDrawParameters class implements only the Appearance property that allows you to change fill and outline settings of individual bars in a Simple, Stacked, or Full-Stacked Bar series.

    Handle an XY diagram‘s OnGetSeriesPointDrawParameters event to change the appearance of individual series points based on certain conditions.

    Code Example: Customize Individual Series Bars

    The following code example demonstrates a diagram’s OnGetSeriesPointDrawParameters event handler that changes the appearance settings of all bars that display peak values in a Simple Bar series.

    procedure TMyForm.cdBarGetSeriesPointDrawParameters(Sender: TdxChartCustomDiagram;
      AArgs: TdxChartGetSeriesPointDrawParametersEventArgs);
    var
      ABarDrawParameters: TdxChartBarSeriesPointDrawParameters;
      ASeries: TdxChartCustomSeries;
      AIndex: Integer;
    begin
      if AArgs.SeriesPoint.Series.Caption = '2020' then
      begin
        if AArgs.DrawParameters.ClassType <> TdxChartBarSeriesPointDrawParameters then Exit;
        ABarDrawParameters := AArgs.DrawParameters as TdxChartBarSeriesPointDrawParameters;
        AIndex := AArgs.SeriesPoint.Index;
        ASeries := AArgs.SeriesPoint.Series;
        if ((AIndex = 0) and (ASeries.Points.Values[AIndex] > ASeries.Points.Values[AIndex + 1])) or
           ((AIndex > 0) and (AIndex < ASeries.Points.Count - 1) and
           (ASeries.Points.Values[AIndex] > ASeries.Points.Values[AIndex + 1]) and
            (ASeries.Points.Values[AIndex] > ASeries.Points.Values[AIndex - 1])) then
        begin
          ABarDrawParameters.Appearance.BeginUpdate;
          ABarDrawParameters.Appearance.FillOptions.Color := TdxAlphaColors.OrangeRed;
          ABarDrawParameters.Appearance.FillOptions.Mode := TdxFillOptionsMode.Hatch;
          ABarDrawParameters.Appearance.FillOptions.HatchStyle := TdxFillOptionsHatchStyle.ForwardDiagonal;
          ABarDrawParameters.Appearance.FillOptions.Color2 := TdxAlphaColors.Teal;
          ABarDrawParameters.Appearance.StrokeOptions.Color := TdxAlphaColors.Red;
          ABarDrawParameters.Appearance.StrokeOptions.Style := TdxStrokeStyle.Solid;
          ABarDrawParameters.Appearance.EndUpdate;
        end;
      end;
    end;
    

    VCL Chart Control: Custom Series Points in a Simple Bar View

    Indirect TdxChartLineSeriesPointDrawParameters Class Reference

    The TdxChartGetSeriesPointDrawParametersEventArgs.DrawParameters property references the TdxChartBarSeriesPointDrawParameters class as a TdxChartSeriesPointDrawParameters object when a diagram’s OnGetSeriesPointDrawParameters event occurs for an XY series with the active Simple, Stacked, or Full-Stacked Bar View.

    You need to cast a TdxChartSeriesPointDrawParameters object to the TdxChartBarSeriesPointDrawParameters class to access all draw settings of a series point in a Simple, Stacked, or Full-Stacked Bar series.

    Tip

    You can call a TdxChartSeriesPointDrawParameters object’s ClassType function within an OnGetSeriesPointDrawParameters event handler to identify the actual point draw series type.

    Inheritance

    TObject
    TdxChartSeriesPointDrawParameters
    TdxChartBarSeriesPointDrawParameters
    See Also