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Bug 2083

Summary:	Impossible to display symbols in legend when using series group
Product:	VCL TeeChart	Reporter:	boris.seve
Component:	Chart	Assignee:	Steema Issue Manager <issuemanager>
Status:	RESOLVED FIXED
Severity:	normal	CC:	david
Priority:	---
Version:	23.171221
Target Milestone:	---
Hardware:	PC
OS:	Windows
Chart Series:	---	Delphi / C++ Builder RAD IDE Version:
Attachments:	Modify Chart.pas file

Description boris.seve 2018-09-04 09:49:08 EDT

Created attachment 853 [details]
Modify Chart.pas file

Impossible to display symbols in legend when using series group.

I modify file Chart.pas (attach to that case) to add symbol in legend when using series group.
It is probably not perfect, I will let your team make a better fix for that.

Comment 1 david berneda 2023-03-17 15:33:06 EDT

Using the symbol of the first series in the group is an alternative solution but maybe not what is usually expected.

The aim is to provide some group symbol color or icon property.

A temporary fix now allows using the Symbol.OnDraw event to custom paint the symbol.

With the latest version:

procedure TForm1.PaintSymbol(Sender:TObject; Series:TChartSeries;
                             ValueIndex:Integer; R:TRect);
begin
  // Valueindex is the group index

  Chart1.Canvas.Brush.Color:=clYellow;
  Chart1.Canvas.Rectangle(R);
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Chart1.Legend.Symbol.OnDraw:=PaintSymbol;
end;