THighLow & Smoothing

[Karsten]

Is there an option to get a highlow bar with smoothed low and smooth high curve automatically without adding more points??
Right now the dark red highlow it's not smooth at all (see example)

example.jpg (73.27 KiB) Viewed 2881 times

Cheers
Karsten

BCB5 & TChart 8.04 VCL

[Sandra]

Hello Karsten,

Sorry for the delay. I recommend three options for solve your problem:

• - Using GDI+ canvas, you can find an example in Demo of TeeChartVCL, concretely in Canvas/GDI+Canvas.
  - Using AntiAlias canvas, you find an example in Demo Canavas/AntiAlias
  - Using Tool Anti-Alias. There is an example to Tools/AntiAlias Filter in Demo Project of TeeCharVCL

I hope will helps.

Thanks,

[Yeray]

Hi Karsten,

Another option could be using 2 TSmoothing functions, one for the High Line and one for the Low line. The Smoothing function, however, uses more points internally.
Here it is an example:

Code: Select all

uses Series, ErrorBar, TeeSpline, TeeSeriesBandTool;

procedure TForm1.FormCreate(Sender: TObject);
var HighLow: THighLowSeries;
    Fast1, Fast2, dummy: TFastLineSeries;
    Smooth1, Smooth2: TSmoothingFunction;
    SeriesBand1: TSeriesBandTool;
begin
  Chart1.View3D:=false;
  Chart1.Legend.Visible:=false;

  HighLow:=Chart1.AddSeries(THighLowSeries) as THighLowSeries;
  HighLow.FillSampleValues();
  HighLow.Brush.Style:=bsSolid;

  Smooth1:=TSmoothingFunction.Create(self);
  Smooth2:=TSmoothingFunction.Create(self);

  Fast1:=Chart1.AddSeries(TFastLineSeries) as TFastLineSeries;
  Fast2:=Chart1.AddSeries(TFastLineSeries) as TFastLineSeries;
  dummy:=TFastLineSeries.Create(self);
  Fast1.FunctionType:=Smooth1;
  Fast2.FunctionType:=Smooth2;
  Fast1.Color:=clBlack;
  Fast2.Color:=clBlack;

  dummy.XValues.Value:=HighLow.XValues.Value;
  dummy.YValues.Value:=HighLow.LowValues.Value;
  dummy.XValues.Count:=HighLow.XValues.Count;
  dummy.YValues.Count:=HighLow.YValues.Count;

  Fast1.DataSource:=HighLow;
  Fast2.DataSource:=dummy;

  HighLow.Active:=false;

  SeriesBand1:=Chart1.Tools.Add(TSeriesBandTool) as TSeriesBandTool;
  SeriesBand1.Series:=Fast1;
  SeriesBand1.Series2:=Fast2;
  SeriesBand1.Brush.BackColor:=HighLow.Color;
end;