diff --git a/components/tachart/demo/func/main.lfm b/components/tachart/demo/func/main.lfm
index fd36e85d88..44f4616c98 100644
--- a/components/tachart/demo/func/main.lfm
+++ b/components/tachart/demo/func/main.lfm
@@ -1,7 +1,7 @@
 object Form1: TForm1
-  Left = 290
+  Left = 653
   Height = 362
-  Top = 152
+  Top = 209
   Width = 461
   Caption = 'Form1'
   ClientHeight = 362
@@ -26,6 +26,10 @@ object Form1: TForm1
         Scale = 1
       end>
     ExpandPercentage = 10
+    Extent.YMin = -6
+    Extent.YMax = 6
+    Extent.UseYMin = True
+    Extent.UseYMax = True
     Foot.Brush.Color = clBtnFace
     Foot.Font.Color = clBlue
     Legend.Visible = True
@@ -38,29 +42,25 @@ object Form1: TForm1
     ParentColor = False
     object Chart1FuncSeries1: TFuncSeries
       Extent.XMin = -6.28
-      Extent.YMin = -1
       Extent.XMax = 6.28
-      Extent.YMax = 1
       Extent.UseXMin = True
-      Extent.UseYMin = True
       Extent.UseXMax = True
-      Extent.UseYMax = True
       OnCalculate = Chart1FuncSeries1Calculate
       Pen.Color = clOlive
       Pen.Width = 2
       Step = 4
-      Title = 'Sin(x)'
+      Title = '1 / Sin(x)'
     end
     object Chart1XAxis: TLine
-      ShowInLegend = False
       Position = 0
       SeriesColor = clBlack
+      ShowInLegend = False
     end
     object Chart1YAxis: TLine
-      ShowInLegend = False
       LineStyle = lsVertical
       Position = 0
       SeriesColor = clBlack
+      ShowInLegend = False
     end
     object Chart1BarSeries1: TBarSeries
       Title = 'Cos(x)'
@@ -72,6 +72,16 @@ object Form1: TForm1
       OnDraw = Chart1UserDrawnSeries1Draw
     end
   end
+  object cbDomain: TCheckBox
+    Left = 392
+    Height = 17
+    Top = 316
+    Width = 55
+    Anchors = [akRight, akBottom]
+    Caption = 'Domain'
+    OnChange = cbDomainChange
+    TabOrder = 1
+  end
   object UserDefinedChartSource1: TUserDefinedChartSource
     OnGetChartDataItem = UserDefinedChartSource1GetChartDataItem
     PointsNumber = 14
diff --git a/components/tachart/demo/func/main.lrs b/components/tachart/demo/func/main.lrs
index c951ee9aab..6914234571 100644
--- a/components/tachart/demo/func/main.lrs
+++ b/components/tachart/demo/func/main.lrs
@@ -1,30 +1,29 @@
-{ This is an automatically generated lazarus resource file }
-
 LazarusResources.Add('TForm1','FORMDATA',[
-  'TPF0'#6'TForm1'#5'Form1'#4'Left'#3'"'#1#6'Height'#3'j'#1#3'Top'#3#152#0#5'Wi'
-  +'dth'#3#205#1#7'Caption'#6#5'Form1'#12'ClientHeight'#3'j'#1#11'ClientWidth'#3
-  +#205#1#8'Position'#7#14'poScreenCenter'#10'LCLVersion'#6#6'0.9.29'#0#6'TChar'
-  +'t'#6'Chart1'#4'Left'#2#0#6'Height'#3'j'#1#3'Top'#2#0#5'Width'#3#205#1#8'Axi'
-  +'sList'#14#1#9'Alignment'#7#7'calLeft'#6'Offset'#5#0#0#0#0#0#0#0#0#0#0#5'Sca'
-  +'le'#5#0#0#0#0#0#0#0#128#255'?'#22'Title.Font.Orientation'#3#132#3#0#1#9'Ali'
-  +'gnment'#7#9'calBottom'#6'Offset'#5#0#0#0#0#0#0#0#0#0#0#5'Scale'#5#0#0#0#0#0
-  +#0#0#128#255'?'#0#0#16'ExpandPercentage'#2#10#16'Foot.Brush.Color'#7#9'clBtn'
-  +'Face'#15'Foot.Font.Color'#7#6'clBlue'#14'Legend.Visible'#9#17'Title.Brush.C'
-  +'olor'#7#9'clBtnFace'#16'Title.Font.Color'#7#6'clBlue'#18'Title.Text.Strings'
-  +#1#6#7'TAChart'#0#5'Align'#7#8'alClient'#11'ParentColor'#8#0#11'TFuncSeries'
-  +#17'Chart1FuncSeries1'#11'Extent.XMin'#5#0#248'(\'#143#194#245#200#1#192#11
-  +'Extent.YMin'#5#0#0#0#0#0#0#0#128#255#191#11'Extent.XMax'#5#0#248'(\'#143#194
-  +#245#200#1'@'#11'Extent.YMax'#5#0#0#0#0#0#0#0#128#255'?'#14'Extent.UseXMin'#9
-  +#14'Extent.UseYMin'#9#14'Extent.UseXMax'#9#14'Extent.UseYMax'#9#11'OnCalcula'
-  +'te'#7#26'Chart1FuncSeries1Calculate'#9'Pen.Color'#7#7'clOlive'#9'Pen.Width'
-  +#2#2#4'Step'#2#4#5'Title'#6#6'Sin(x)'#0#0#5'TLine'#11'Chart1XAxis'#12'ShowIn'
-  +'Legend'#8#8'Position'#5#0#0#0#0#0#0#0#0#0#0#11'SeriesColor'#7#7'clBlack'#0#0
-  +#5'TLine'#11'Chart1YAxis'#12'ShowInLegend'#8#9'LineStyle'#7#10'lsVertical'#8
-  +'Position'#5#0#0#0#0#0#0#0#0#0#0#11'SeriesColor'#7#7'clBlack'#0#0#10'TBarSer'
-  +'ies'#16'Chart1BarSeries1'#5'Title'#6#6'Cos(x)'#14'BarBrush.Color'#7#12'clMo'
-  +'neyGreen'#11'SeriesColor'#7#12'clMoneyGreen'#6'Source'#7#23'UserDefinedChar'
-  +'tSource1'#0#0#16'TUserDrawnSeries'#22'Chart1UserDrawnSeries1'#6'OnDraw'#7#26
-  +'Chart1UserDrawnSeries1Draw'#0#0#0#23'TUserDefinedChartSource'#23'UserDefine'
-  +'dChartSource1'#18'OnGetChartDataItem'#7'''UserDefinedChartSource1GetChartDa'
-  +'taItem'#12'PointsNumber'#2#14#4'left'#3#135#0#3'top'#2'r'#0#0#0
+  'TPF0'#6'TForm1'#5'Form1'#4'Left'#3#141#2#6'Height'#3'j'#1#3'Top'#3#209#0#5'W'
+  +'idth'#3#205#1#7'Caption'#6#5'Form1'#12'ClientHeight'#3'j'#1#11'ClientWidth'
+  +#3#205#1#8'Position'#7#14'poScreenCenter'#10'LCLVersion'#6#6'0.9.29'#0#6'TCh'
+  +'art'#6'Chart1'#4'Left'#2#0#6'Height'#3'j'#1#3'Top'#2#0#5'Width'#3#205#1#8'A'
+  +'xisList'#14#1#9'Alignment'#7#7'calLeft'#6'Offset'#2#0#5'Scale'#2#1#22'Title'
+  +'.Font.Orientation'#3#132#3#0#1#9'Alignment'#7#9'calBottom'#6'Offset'#2#0#5
+  +'Scale'#2#1#0#0#16'ExpandPercentage'#2#10#11'Extent.YMin'#2#250#11'Extent.YM'
+  +'ax'#2#6#14'Extent.UseYMin'#9#14'Extent.UseYMax'#9#16'Foot.Brush.Color'#7#9
+  +'clBtnFace'#15'Foot.Font.Color'#7#6'clBlue'#14'Legend.Visible'#9#17'Title.Br'
+  +'ush.Color'#7#9'clBtnFace'#16'Title.Font.Color'#7#6'clBlue'#18'Title.Text.St'
+  +'rings'#1#6#7'TAChart'#0#5'Align'#7#8'alClient'#11'ParentColor'#8#0#11'TFunc'
+  +'Series'#17'Chart1FuncSeries1'#11'Extent.XMin'#5#195#245'(\'#143#194#245#200
+  +#1#192#11'Extent.XMax'#5#195#245'(\'#143#194#245#200#1'@'#14'Extent.UseXMin'
+  +#9#14'Extent.UseXMax'#9#11'OnCalculate'#7#26'Chart1FuncSeries1Calculate'#9'P'
+  +'en.Color'#7#7'clOlive'#9'Pen.Width'#2#2#4'Step'#2#4#5'Title'#6#10'1 / Sin(x'
+  +')'#0#0#5'TLine'#11'Chart1XAxis'#8'Position'#2#0#11'SeriesColor'#7#7'clBlack'
+  +#12'ShowInLegend'#8#0#0#5'TLine'#11'Chart1YAxis'#9'LineStyle'#7#10'lsVertica'
+  +'l'#8'Position'#2#0#11'SeriesColor'#7#7'clBlack'#12'ShowInLegend'#8#0#0#10'T'
+  +'BarSeries'#16'Chart1BarSeries1'#5'Title'#6#6'Cos(x)'#14'BarBrush.Color'#7#12
+  +'clMoneyGreen'#11'SeriesColor'#7#12'clMoneyGreen'#6'Source'#7#23'UserDefined'
+  +'ChartSource1'#0#0#16'TUserDrawnSeries'#22'Chart1UserDrawnSeries1'#6'OnDraw'
+  +#7#26'Chart1UserDrawnSeries1Draw'#0#0#0#9'TCheckBox'#8'cbDomain'#4'Left'#3
+  +#136#1#6'Height'#2#17#3'Top'#3'<'#1#5'Width'#2'7'#7'Anchors'#11#7'akRight'#8
+  +'akBottom'#0#7'Caption'#6#6'Domain'#8'OnChange'#7#14'cbDomainChange'#8'TabOr'
+  +'der'#2#1#0#0#23'TUserDefinedChartSource'#23'UserDefinedChartSource1'#18'OnG'
+  +'etChartDataItem'#7'''UserDefinedChartSource1GetChartDataItem'#12'PointsNumb'
+  +'er'#2#14#4'left'#3#135#0#3'top'#2'r'#0#0#0
 ]);
diff --git a/components/tachart/demo/func/main.pas b/components/tachart/demo/func/main.pas
index 4d8c67b279..1e19477994 100644
--- a/components/tachart/demo/func/main.pas
+++ b/components/tachart/demo/func/main.pas
@@ -5,8 +5,8 @@ unit main;
 interface
 
 uses
-  Classes, SysUtils, FileUtil, LResources, Forms, Controls, Graphics, Dialogs,
-  TAGraph, TASeries, TASources;
+  Classes, StdCtrls, SysUtils, FileUtil, LResources, Forms, Controls, Graphics,
+  Dialogs, TAGraph, TASeries, TASources;
 
 type
 
@@ -19,7 +19,9 @@ type
     Chart1UserDrawnSeries1: TUserDrawnSeries;
     Chart1YAxis: TLine;
     Chart1XAxis: TLine;
+    cbDomain: TCheckBox;
     UserDefinedChartSource1: TUserDefinedChartSource;
+    procedure cbDomainChange(Sender: TObject);
     procedure Chart1FuncSeries1Calculate(const AX: Double; out AY: Double);
     procedure Chart1UserDrawnSeries1Draw(ACanvas: TCanvas; const ARect: TRect);
     procedure UserDefinedChartSource1GetChartDataItem(
@@ -37,9 +39,22 @@ uses
 
 { TForm1 }
 
+procedure TForm1.cbDomainChange(Sender: TObject);
+var
+  i: Integer;
+begin
+  with Chart1FuncSeries1.DomainExclusions do begin
+    Clear;
+    Epsilon := 1e-7;
+    if cbDomain.Checked then
+      for i := -10 to 10 do
+        AddPoint(i * Pi);
+  end;
+end;
+
 procedure TForm1.Chart1FuncSeries1Calculate(const AX: Double; out AY: Double);
 begin
-  AY := Sin(AX);
+  AY := 1 / Sin(AX);
 end;
 
 procedure TForm1.Chart1UserDrawnSeries1Draw(