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Bug 2001

Summary:	NearestPoint tool never considers Null points
Product:	VCL TeeChart	Reporter:	yeray alonso <yeray>
Component:	Tools	Assignee:	yeray alonso <yeray>
Status:	RESOLVED FIXED
Severity:	enhancement
Priority:	---
Version:	unspecified
Target Milestone:	---
Hardware:	PC
OS:	Windows
Chart Series:	---	Delphi / C++ Builder RAD IDE Version:

Description yeray alonso 2018-02-23 10:40:02 EST

NearestPoint tool doesn't highlight Null points when they are drawn (TreatNulls:=tnIgnore, as per default).

Here a simple example:

uses Series, TeeTools;

procedure TForm1.FormCreate(Sender: TObject);
var fast1: TFastLineSeries;
    nearest1: TNearestTool;
    i: Integer;
begin
  Chart1.View3D:=false;
  Chart1.Legend.Visible:=false;

  fast1 := Chart1.AddSeries(TFastLineSeries) as TFastLineSeries;
  for i:=0 to 1999 do
  begin
    if (i = 1000) then
       fast1.AddNullXY(i, 200)
    else
       fast1.AddXY(i, 100);
  end;

  fast1.TreatNulls:=tnIgnore;

  Chart1.Axes.Bottom.SetMinMax(0, 2000);
  Chart1.Axes.Left.SetMinMax(0, 300);

  nearest1:=Chart1.Tools.Add(TNearestTool) as TNearestTool;
  nearest1.Brush.Clear;
  nearest1.Pen.Color:=clRed;
  nearest1.Series:=fast1;
end;

Similar bug in TeeChart Java:
http://bugs.teechart.net/show_bug.cgi?id=1999

Similar bug in TeeChart .NET:
http://bugs.teechart.net/show_bug.cgi?id=2000