TdxChartLineSeriesPointDrawParameters.MarkerAppearance Property

Provides access to the appearance settings of the currently processed series point’s marker.

Declaration

delphi

property MarkerAppearance: TdxChartXYSeriesLineMarkerAppearance read;

Property Value

Type	Description
TdxChartXYSeriesLineMarkerAppearance

Stores series point marker appearance settings for Line and Area series Views.

Remarks

Use MarkerAppearance and Appearance properties to customize the appearance of the point marker and line 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 Line series.

Delphi
C++

delphi

procedure TMyForm.cdLineGetSeriesPointDrawParameters(Sender: TdxChartCustomDiagram;
  AArgs: TdxChartGetSeriesPointDrawParametersEventArgs);
var
  ALineDrawParameters: TdxChartLineSeriesPointDrawParameters;
  ASeries: TdxChartCustomSeries;
  AIndex: Integer;
begin
  if AArgs.SeriesPoint.Series.Caption = 'Europe' then
  begin
    if AArgs.DrawParameters.ClassType <> TdxChartLineSeriesPointDrawParameters then Exit;
    ALineDrawParameters := AArgs.DrawParameters as TdxChartLineSeriesPointDrawParameters;
    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
      ALineDrawParameters.MarkerAppearance.FillOptions.Color := TdxAlphaColors.Red;
      ALineDrawParameters.Appearance.BeginUpdate;
      ALineDrawParameters.Appearance.StrokeOptions.Color := TdxAlphaColors.Red;
      ALineDrawParameters.Appearance.StrokeOptions.Style := TdxStrokeStyle.Solid;
      ALineDrawParameters.Appearance.EndUpdate;
    end;
  end;
end;

cpp

void __fastcall TMyForm::cdLineGetSeriesPointDrawParameters(TdxChartCustomDiagram *Sender
   TdxChartGetSeriesPointDrawParametersEventArgs *AArgs)
{
  TdxChartLineSeriesPointDrawParameters *ALineDrawParameters;
  TdxChartCustomSeries *ASeries;
  int AIndex;
  // ...
  if(AArgs->SeriesPoint->Series->Caption == "Europe")
  {
    if(AArgs->DrawParameters->ClassType() != __classid(TdxChartLineSeriesPointDrawParameters)) { return; }
    ALineDrawParameters = dynamic_cast<TdxChartLineSeriesPointDrawParameters*>(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])))
      {
        ALineDrawParameters->MarkerAppearance->FillOptions->Color = TdxAlphaColors::Red;
        ALineDrawParameters->Appearance->BeginUpdate();
        ALineDrawParameters->Appearance->StrokeOptions->Color = TdxAlphaColors::Red;
        ALineDrawParameters->Appearance->StrokeOptions->Style = TdxStrokeStyle::Solid;
        ALineDrawParameters->Appearance->EndUpdate();
      }
  }
}