TdxChartAreaSeriesPointDrawParameters.Appearance Property

Provides access to the appearance settings of the area segment between the currently processed and previous series points.

Declaration

delphi

property Appearance: TdxChartXYSeriesAreaAppearance read;

Property Value

Type	Description
TdxChartXYSeriesAreaAppearance

Stores Area series View appearance settings.

Remarks

Use MarkerAppearance and Appearance properties to customize the appearance of the point marker and area segment associated with the currently processed series point.

Code Example: Customize Individual Series Points

The following code example demonstrates a diagram’s OnGetSeriesPointDrawParameters event handler that changes the appearance settings of points with peak values in a Simple Area series:

Delphi
C++

delphi

procedure TMyForm.cdAreaGetSeriesPointDrawParameters(Sender: TdxChartCustomDiagram;
  AArgs: TdxChartGetSeriesPointDrawParametersEventArgs);
var
  AAreaDrawParameters: TdxChartAreaSeriesPointDrawParameters;
  ASeries: TdxChartCustomSeries;
  AIndex: Integer;
begin
  if AArgs.SeriesPoint.Series.Caption = 'DevAV South' then
  begin
    if AArgs.DrawParameters.ClassType <> TdxChartAreaSeriesPointDrawParameters then Exit;
    AAreaDrawParameters := AArgs.DrawParameters as TdxChartAreaSeriesPointDrawParameters;
    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
      AAreaDrawParameters.MarkerAppearance.FillOptions.Color := TdxAlphaColors.Red;
      AAreaDrawParameters.Appearance.BeginUpdate;
      AAreaDrawParameters.Appearance.FillOptions.Color := TdxAlphaColors.OrangeRed;
      AAreaDrawParameters.Appearance.FillOptions.Mode := TdxFillOptionsMode.Hatch;
      AAreaDrawParameters.Appearance.FillOptions.HatchStyle := TdxFillOptionsHatchStyle.ForwardDiagonal;
      AAreaDrawParameters.Appearance.FillOptions.Color2 := TdxAlphaColors.Teal;
      AAreaDrawParameters.Appearance.StrokeOptions.Color := TdxAlphaColors.Red;
      AAreaDrawParameters.Appearance.StrokeOptions.Style := TdxStrokeStyle.Solid;
      AAreaDrawParameters.Appearance.EndUpdate;
    end;
  end;
end;

cpp

void __fastcall TMyForm::cdAreaGetSeriesPointDrawParameters(TdxChartCustomDiagram *Sender
   TdxChartGetSeriesPointDrawParametersEventArgs *AArgs)
{
  TdxChartAreaSeriesPointDrawParameters *AAreaDrawParameters;
  TdxChartCustomSeries *ASeries;
  int AIndex;
  // ...
  if(AArgs->SeriesPoint->Series->Caption == "DevAV South")
  {
    if(AArgs->DrawParameters->ClassType() != __classid(TdxChartAreaSeriesPointDrawParameters)) { return; }
    AAreaDrawParameters = dynamic_cast<TdxChartAreaSeriesPointDrawParameters*>(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])))
      {
        AAreaDrawParameters->MarkerAppearance->FillOptions->Color = TdxAlphaColors::Red;
        AAreaDrawParameters->Appearance->BeginUpdate();
        AAreaDrawParameters->Appearance->FillOptions->Color = TdxAlphaColors::OrangeRed;
        AAreaDrawParameters->Appearance->FillOptions->Color2 = TdxAlphaColors::Teal;
        AAreaDrawParameters->Appearance->FillOptions->Mode = TdxFillOptionsMode::Hatch;
        AAreaDrawParameters->Appearance->FillOptions->HatchStyle = TdxFillOptionsHatchStyle::ForwardDiagonal;
        AAreaDrawParameters->Appearance->StrokeOptions->Color = TdxAlphaColors::Red;
        AAreaDrawParameters->Appearance->StrokeOptions->Style = TdxStrokeStyle::Solid;
        AAreaDrawParameters->Appearance->EndUpdate();
      }
  }
}