diff --git a/.gitattributes b/.gitattributes
index 488ae9113a..9d05973b66 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1581,6 +1581,7 @@ components/tachart/tatypes.pas svneol=native#text/plain
 components/tachart/tchart.png -text svneol=unset#images/png
 components/tachart/tlistchartsource.png -text
 components/tachart/trandomchartsource.png -text
+components/tachart/tuserdefinedchartsource.png -text
 components/tdbf/Makefile svneol=native#text/plain
 components/tdbf/Makefile.fpc svneol=native#text/plain
 components/tdbf/dbflaz.lpk svneol=native#text/pascal
diff --git a/components/tachart/tagraph.lrs b/components/tachart/tagraph.lrs
index 5d19802915..9d8b7bc603 100644
--- a/components/tachart/tagraph.lrs
+++ b/components/tachart/tagraph.lrs
@@ -47,3 +47,19 @@ LazarusResources.Add('trandomchartsource','PNG',[
   +'R7Z'#240#194#193#245#179'$s'#29#187#154''#9#243#2#216#181'Oxpg'#233#138#0#0
   +#0#0'IEND'#174'B`'#130
 ]);
+LazarusResources.Add('tuserdefinedchartsource','PNG',[
+  #137'PNG'#13#10#26#10#0#0#0#13'IHDR'#0#0#0#24#0#0#0#24#8#6#0#0#0#224'w='#248#0
+  +#0#0#4'gAMA'#0#0#177#143#11#252'a'#5#0#0#0#24'tEXtSoftware'#0'Paint.NET v3.3'
+  +'17'#131'w'#134#0#0#0#242'IDATHK'#221#150#189#13#194'0'#16#133#179#134#23#161
+  +#14'm'#134#160#164'`'#1#139#13#168'3'#0';'#176'AB'#205#6#20#25#229#224#157'8'
+  +'t'#186#152'p'#198#166'I'#164''''#197'v'#252'>'#159#207'?i'#154#213'<1'#246
+  +'TK'#201'I'#129'y'#141#7'>'#215'a'#164#25'D'#0#207#6'4~'#213'4'#221#201#10
+  +#198'.'#128'D'#178#239'o$'#218#30#199'w'#128'!'#132#153'9`Y'#0#24'kS]'#174#2
+  +#176#249#248'+'#192'FS5'#2'k'#142#200'4'#128#206';'#130#178's'#176#180'd'#177
+  +#202'd'#5#21#3'l'#4'0'#167#182'e'#1'R'#12#208#145#240#254'8'#29'X'#26#128'r'
+  +#214#20'}'#218'h]Gl$'#16#251#238#218#7#220#233'5'#199#241#178'!'#8'u0'#23#0
+  +'F/'#16#142'&'''#201'^'#128'@'#178's'#144#3#248')'#201#2#240#28'x'#250#27'w'
+  +#146'S'#167#164#183#206#149'd|T'#162#197#227#186#214#141#150#188'pp'#3#149
+  +#140#220#246']'#205#191'D'#243#0#193'1'#145#19#186#2'@'#31#0#0#0#0'IEND'#174
+  +'B`'#130
+]);
diff --git a/components/tachart/tasources.pas b/components/tachart/tasources.pas
index c8b318544e..b7583b5a83 100644
--- a/components/tachart/tasources.pas
+++ b/components/tachart/tasources.pas
@@ -144,6 +144,33 @@ type
     property YMin: Double read FYMin write SetYMin;
   end;
 
+  TUserDefinedChartSource = class;
+
+  TGetChartDataItemEvent = procedure (
+    ASource: TUserDefinedChartSource; AIndex: Integer;
+    var AItem: TChartDataItem) of object;
+
+  { TUserDefinedChartSource }
+
+  TUserDefinedChartSource = class(TCustomChartSource)
+  private
+    FItem: TChartDataItem;
+    FOnGetChartDataItem: TGetChartDataItemEvent;
+    FPointsNumber: Integer;
+    procedure SetOnGetChartDataItem(const AValue: TGetChartDataItemEvent);
+    procedure SetPointsNumber(const AValue: Integer);
+  protected
+    function GetCount: Integer; override;
+    function GetItem(AIndex: Integer): PChartDataItem; override;
+  public
+    procedure Reset; inline;
+  published
+    property OnGetChartDataItem: TGetChartDataItemEvent
+      read FOnGetChartDataItem write SetOnGetChartDataItem;
+    property PointsNumber: Integer
+      read FPointsNumber write SetPointsNumber default 0;
+  end;
+
 function DoublePoint(const ACoord: TChartDataItem): TDoublePoint; inline; overload;
 procedure Register;
 
@@ -179,7 +206,8 @@ end;
 procedure Register;
 begin
   RegisterComponents(
-    CHART_COMPONENT_IDE_PAGE, [TListChartSource, TRandomChartSource]);
+    CHART_COMPONENT_IDE_PAGE,
+    [TListChartSource, TRandomChartSource, TUserDefinedChartSource]);
 end;
 
 { TCustomChartSource }
@@ -684,5 +712,43 @@ begin
   FIsListening := false;
 end;
 
+{ TUserDefinedChartSource }
+
+function TUserDefinedChartSource.GetCount: Integer;
+begin
+  Result := FPointsNumber;
+end;
+
+function TUserDefinedChartSource.GetItem(AIndex: Integer): PChartDataItem;
+begin
+  FItem.X := 0;
+  FItem.Y := 0;
+  FItem.Color := clTAColor;
+  if Assigned(FOnGetChartDataItem) then
+    FOnGetChartDataItem(Self, AIndex, FItem);
+  Result := @FItem;
+end;
+
+procedure TUserDefinedChartSource.Reset;
+begin
+  InvalidateCaches;
+  Notify;
+end;
+
+procedure TUserDefinedChartSource.SetOnGetChartDataItem(
+  const AValue: TGetChartDataItemEvent);
+begin
+  if FOnGetChartDataItem = AValue then exit;
+  FOnGetChartDataItem := AValue;
+  Reset;
+end;
+
+procedure TUserDefinedChartSource.SetPointsNumber(const AValue: Integer);
+begin
+  if FPointsNumber = AValue then exit;
+  FPointsNumber := AValue;
+  Reset;
+end;
+
 end.
 
diff --git a/components/tachart/tuserdefinedchartsource.png b/components/tachart/tuserdefinedchartsource.png
new file mode 100644
index 0000000000..7167002b4f
Binary files /dev/null and b/components/tachart/tuserdefinedchartsource.png differ