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Bug 935

Summary:	The Pie and Donut Series with small values don't draw correctly in GDI Canvas.
Product:	VCL TeeChart	Reporter:	sandra pazos <sandra>
Component:	Canvas	Assignee:	Steema Issue Manager <issuemanager>
Status:	RESOLVED FIXED
Severity:	major	CC:	david.novo, david
Priority:	High
Version:	unspecified
Target Milestone:	---
Hardware:	PC
OS:	Windows
Chart Series:	---	Delphi / C++ Builder RAD IDE Version:

Description sandra pazos 2014-09-26 07:22:15 EDT

The Pie and Donut Series with small values don't draw correctly in GDI Canvas, specifically, when the values are smaller than 0.05 % of the total. To reproduce the problem for Donut Series, is necessary use custom radius smaller than 165, too.

The problem doesn't appear in GDI+ canvas. 

The code below reproduces the problem for Donut and Pie series in GDI canvas:
uses Series,TeeDonut, TeCanvas;
var Series1:TPieSeries;
Chart1 :TChart;
procedure TForm1.FormCreate(Sender: TObject);
begin
  Chart1 := TChart.Create(Self);
  Chart1.Parent := Self;
  Chart1.Align := alClient;
  Chart1.Canvas := TTeeCanvas3D.Create;
  Chart1.View3D:= False;
  Series1 := TPieSeries.Create(Self);
  Chart1.AddSeries(Series1);
    With Series1 do
    begin
      CustomXRadius := 138;
      CustomYRadius := 138;
      MultiPie := mpDisabled;
      DonutPercent := 42; //  Comment this line to reproduce the issue for Pie Chart.
      //Add Data
      AddPie(15.82,'Lymphs',clMoneyGreen);
      AddPie(9.3,'Monos',clLime);
      AddPie(37.04,'Grans',clGreen);
      AddPie(0.03,'Beads',clOlive);
      AddPie(0,'Debris', clWebGreenYellow);
    end;
end;