Keeping the Legend Symbols the same size

TeeGrid VCL / FMX for Embarcadero RAD Studio, Delphi, C++ Builder and Lazarus Free Pascal.
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EdDressel
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Keeping the Legend Symbols the same size

Post by EdDressel » Thu Mar 12, 2020 8:46 pm

In the attached demo, you can select if the line for the pie series is visible or not, and if it is, if it is white or black.

THis part works fine.

I would like to keep the symbols in the legend large--without the border around them (like the chart when no series pen is visible).

Can this be done?

Thank you,

Ed Dressel
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Donut and Legend.zip
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Ed Dressel
President
RetireReady Solutions

EdDressel
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Re: Keeping the Legend Symbols the same size

Post by EdDressel » Fri Mar 13, 2020 10:15 pm

I tried the following code but it colors each symbol with the same color (of course). I don't know how to get the color for each slice.

Code: Select all

  Chart1.Legend.Symbol.OnDraw := ChartLegendDraw;


procedure TForm1.ChartLegendDraw(Sender: TObject; aSeries:TChartSeries; ValueIndex:Integer; R:TRect);
var
  lBarSeries: TBarSeries;
  lCanvas: TCanvas3D;
  lBlend: TTeeBlend;
begin
  lCanvas := aSeries.ParentChart.Canvas;
  lCanvas.Brush.Color := aSeries.Color;
  lCanvas.Pen.Color := lCanvas.Brush.Color;
  lCanvas.Rectangle(R);
end;
Thank you for your help.

Ed Dressel
Ed Dressel
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EdDressel
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Re: Keeping the Legend Symbols the same size

Post by EdDressel » Tue Mar 17, 2020 6:01 pm

I posted this in the wrong group, but in case you are wondering, here is the solution:

procedure TForm1.ChartLegendDraw(Sender: TObject; aSeries:TChartSeries; aValueIndex:Integer; aR:TRect);
var
lCanvas: TCanvas3D;
lClr: TColor;
begin
lCanvas := aSeries.ParentChart.Canvas;
lClr := aSeries.LegendItemColor(aValueIndex);
lCanvas.Brush.Color := lClr;
lCanvas.Pen.Color := lClr;
lCanvas.Rectangle(aR);
end;


This concerns me about FMX though--no one here.
Ed Dressel
President
RetireReady Solutions

Marc
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Re: Keeping the Legend Symbols the same size

Post by Marc » Wed Mar 18, 2020 12:19 pm

Hello Ed,

Code: Select all

This concerns me about FMX though--no one here.
Yes, we were slow to react to your post. Workload doesn't always allow us to get to every post straight away; we should have noticed your post on the TeeGrid forum and moved it to TeeChart.

Regards,
Marc
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Yeray
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Re: Keeping the Legend Symbols the same size

Post by Yeray » Wed Mar 18, 2020 3:38 pm

Hello,

An alternative would be to hide the pie series from the legend and use a point series for each item you want to be in the legend. Ie:

Code: Select all

var i: Integer;
begin
  for i:=0 to Series1.Count-1 do
    with TPointSeries(Chart1.AddSeries(TPointSeries)) do
    begin
      Pointer.Pen.Visible:=False;
      Pointer.Size:=6;
      Title:=Series1.LegendString(i,Chart1.Legend.TextStyle);
      Color:=Series1.ValueColor[i];
    end;

  Series1.ShowInLegend:=False;
  Chart1.Walls.Hide;
Best Regards,
ImageYeray Alonso
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Steema Software
Av. Montilivi 33, 17003 Girona, Catalonia (SP)
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