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Bug 1233

Summary: Histogram series with a single values makes wrong axis range
Product: VCL TeeChart Reporter: christopher ireland <chris>
Component: SeriesAssignee: Steema Issue Manager <issuemanager>
Status: RESOLVED NOTABUG    
Severity: critical CC: narcis
Priority: ---    
Version: unspecified   
Target Milestone: ---   
Hardware: PC   
OS: Windows   
Chart Series: --- Delphi / C++ Builder RAD IDE Version:

Description christopher ireland 2015-06-10 06:14:28 EDT 
Use the following code to reproduce:

procedure TForm1.InitializeChart;
var t : Integer;
var tmp : TChartValue;
begin
   Chart1.View3D:=false;
   Chart1.AddSeries(THistogramSeries);
   Chart1.AddSeries(THistogramSeries);

   For t:=0 To 24 do
      Chart1[0].Add(t);
   begin
   end;

   tmp:= Chart1[0].MaxYValue + 1;
   Chart1[0].Add(tmp);
   Chart1[1].Add(tmp);
end;

this is similar, but not identical to, the .NET ticket:
http://bugs.teechart.net/show_bug.cgi?id=1232
Comment 1 narcís calvet 2016-04-07 05:45:44 EDT 
This issue can be fixed by the addition of null points, e.g.:

uses StatChar;

procedure TForm1.FormCreate(Sender: TObject);
var t : Integer;
var tmp : TChartValue;
begin
   Chart1.View3D:=false;
   Chart1.AddSeries(THistogramSeries);
   Chart1.AddSeries(THistogramSeries);

   For t:=0 To 24 do
   begin
      Chart1[0].Add(t);
      Chart1[1].AddNull('');
   end;

   tmp:= Chart1[0].MaxYValue + 1;
   Chart1[0].Add(tmp);
   Chart1[1].Add(tmp);
end;