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

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.

Delphi

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;

C++

void __fastcall TMyForm::cdBarGetSeriesPointDrawParameters(TdxChartCustomDiagram *Sender
   TdxChartGetSeriesPointDrawParametersEventArgs *AArgs)
{
  TdxChartBarSeriesPointDrawParameters *ABarDrawParameters;
  TdxChartCustomSeries *ASeries;
  int AIndex;
  // ...
  if(AArgs->SeriesPoint->Series->Caption == "2020")
  {
    if(AArgs->DrawParameters->ClassType() != __classid(TdxChartBarSeriesPointDrawParameters)) { return; }
    ABarDrawParameters = dynamic_cast<TdxChartBarSeriesPointDrawParameters*>(AArgs->DrawParameters);
    AIndex = AArgs->SeriesPoint->Index;
    ASeries = AArgs->SeriesPoint->Series;
    if(((AIndex == 0) && (ASeries->Points->Values[AIndex] > ASeries->Points->Values[AIndex + 1])) ||
      ((AIndex > 0) && (AIndex < ASeries->Points->Count - 1) &&
      (ASeries->Points->Values[AIndex] > ASeries->Points->Values[AIndex + 1]) &&
      (ASeries->Points->Values[AIndex] > ASeries->Points->Values[AIndex - 1])))
      {
        ABarDrawParameters->MarkerAppearance->FillOptions->Color = TdxAlphaColors::Red;
        ABarDrawParameters->Appearance->BeginUpdate();
        ABarDrawParameters->Appearance->FillOptions->Color = TdxAlphaColors::OrangeRed;
        ABarDrawParameters->Appearance->FillOptions->Color2 = TdxAlphaColors::Teal;
        ABarDrawParameters->Appearance->FillOptions->Mode = TdxFillOptionsMode::Hatch;
        ABarDrawParameters->Appearance->FillOptions->HatchStyle = TdxFillOptionsHatchStyle::ForwardDiagonal;
        ABarDrawParameters->Appearance->StrokeOptions->Color = TdxAlphaColors::Red;
        ABarDrawParameters->Appearance->StrokeOptions->Style = TdxStrokeStyle::Solid;
        ABarDrawParameters->Appearance->EndUpdate();
      }
  }
}

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