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Bug 1890

Summary:	TSmoothingFunction forces Order and gives a wrong result when XValues go
Product:	VCL TeeChart	Reporter:	yeray alonso <yeray>
Component:	Functions	Assignee:	Steema Issue Manager <issuemanager>
Status:	RESOLVED FIXED
Severity:	enhancement	CC:	marc
Priority:	---
Version:	21.170329
Target Milestone:	---
Hardware:	PC
OS:	Windows
URL:	http://www.teechart.net/support/viewtopic.php?f=3&t=16627
Chart Series:	---	Delphi / C++ Builder RAD IDE Version:

Description yeray alonso 2017-07-11 09:45:15 EDT

Having a TLineSeries with XValues going forward and backwards, if you set a TSmoothingFunction to it, the result doesn't use the correct XValues.Order.

See the following example:

uses Series;

var  Series1: TLineSeries;
     Series2: TLineSeries;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Series1:=Chart1.AddSeries(TLineSeries) as TLineSeries;
  Series2:=Chart1.AddSeries(TLineSeries) as TLineSeries;

  Chart1.View3D:=False;

  Chart1.BottomAxis.Logarithmic := true;
  Chart1.BottomAxis.Automatic := false;
  Chart1.BottomAxis.SetMinMax(10, 10000);
  Chart1.LeftAxis.SetMinMax(-6, 6);
  Series1.Pointer.Visible := true;
  Series2.DataSource := Series1;
  Series2.Color := clRed;
  Series1.Clear;
  Series1.AddXY(10,2);
  Series1.AddXY(32,2);
  Series1.AddXY(600,2.5);
  Series1.AddXY(1000,0);
  Series1.AddXY(2000,-2);
  Series1.AddXY(8000,-1.5);
  Series1.AddXY(10000,-1.5);
  Series2.CheckDataSource;
  Series2.Smoothed := true;
end;

The workarounds are:
- To use THorizLineSeries instead of TLineSeries.
- To use this code:

  Series2.XValues.Order:=loNone;
  Series2.HasZValues:=True;