TAChart: Support ChartAxis.Position cuAxis. For this, add OrthogonalAxisIndex property and corresponding property editor.

components/tachart/editors/taseriespropeditors.pas

@@ -10,11 +10,13 @@ implementation
 
 uses
   Graphics, Classes, Math, PropEdits, SysUtils, LCLIntf, typinfo,
-  TATypes, TADrawerCanvas, TACustomSeries, TASeries, TALegend,
+  TATypes, TADrawerCanvas, TAChartAxis, TACustomSeries, TASeries, TALegend,
   TAGraph, TAChartCombos;
 
 type
   TAxisIndexPropertyEditor = class(TOrdinalPropertyEditor)
+  protected
+    function GetChart: TChart; virtual;
   public
     function GetAttributes: TPropertyAttributes; override;
     function OrdValueToVisualValue(AOrdValue: Longint): String; override;
@@ -22,6 +24,13 @@ type
     procedure SetValue(const ANewValue: String); override;
   end;
 
+  TOrthogonalAxisIndexPropertyEditor = class(TAxisIndexPropertyEditor)
+  protected
+    function GetChart: TChart; override;
+  public
+    procedure GetValues(AProc: TGetStrProc); override;
+  end;
+
   TSeriesPointerStylePropertyEditor = class(TEnumPropertyEditor)
   private
     procedure DrawPointer(ACanvas: TCanvas; ARect: TRect;
@@ -41,6 +50,8 @@ procedure Register;
 begin
   RegisterPropertyEditor(
     TypeInfo(TChartAxisIndex), TCustomChartSeries, '', TAxisIndexPropertyEditor);
+  RegisterPropertyEditor(
+    TypeInfo(TChartAxisIndex), TChartAxis, '', TOrthogonalAxisIndexPropertyEditor);
   RegisterPropertyEditor(
     TypeInfo(TSeriesPointerStyle), TSeriesPointer, '', TSeriesPointerStylePropertyEditor);
   RegisterPropertyEditor(
@@ -54,14 +65,20 @@ begin
   Result := [paMultiSelect, paValueList, paRevertable];
 end;
 
-procedure TAxisIndexPropertyEditor.GetValues(AProc: TGetStrProc);
+function TAxisIndexPropertyEditor.GetChart: TChart;
 var
   s: TCustomChartSeries;
+begin
+  s := GetComponent(0) as TCustomChartSeries;
+  Result := s.ParentChart;
+end;
+
+procedure TAxisIndexPropertyEditor.GetValues(AProc: TGetStrProc);
+var
   ch: TChart;
   i: Integer;
 begin
-  s := GetComponent(0) as TCustomChartSeries;
-  ch := s.ParentChart;
+  ch := GetChart;
   AProc('-1 None');
   if ch <> nil then
     for i := 0 to ch.AxisList.Count - 1 do
@@ -71,11 +88,9 @@ end;
 function TAxisIndexPropertyEditor.OrdValueToVisualValue(
   AOrdValue: Longint): String;
 var
-  s: TCustomChartSeries;
   ch: TChart;
 begin
-  s := GetComponent(0) as TCustomChartSeries;
-  ch := s.ParentChart;
+  ch := GetChart;
   Result := IntToStr(AOrdValue) + ' ';
   if Assigned(ch) and InRange(AOrdValue, 0, ch.AxisList.Count - 1) then
     Result += ch.AxisList[AOrdValue].DisplayName
@@ -95,6 +110,42 @@ begin
 end;
 
 
+{ TOrthogonalAxisIndexPropertyEditor }
+
+function TOrthogonalAxisIndexPropertyEditor.GetChart: TChart;
+var
+  ax: TChartAxis;
+begin
+  ax := GetComponent(0) as TChartAxis;
+  Result := ax.GetChart as TChart;
+end;
+
+procedure TOrthogonalAxisIndexPropertyEditor.GetValues(AProc: TGetStrProc);
+var
+  ax: TChartAxis;
+  ch: TChart;
+  i: Integer;
+begin
+  ax := GetComponent(0) as TChartAxis;
+  ch := GetChart;
+  AProc('-1 None');
+  if ch <> nil then
+  begin
+    if ax.IsVertical then
+    begin
+      for i := 0 to ch.AxisList.Count - 1 do
+        if not ch.AxisList[i].IsVertical then
+          AProc(IntToStr(i) + ' ' + ch.AxisList[i].DisplayName)
+    end else
+    begin
+      for i := 0 to ch.AxisList.Count - 1 do
+        if ch.AxisList[i].IsVertical then
+          AProc(IntTostr(i) + ' ' + ch.AxisList[i].DisplayName);
+    end;
+  end;
+end;
+
+
 { TSeriesPointerStylePropertyEditor }
 
 procedure TSeriesPointerStylePropertyEditor.DrawPointer(ACanvas: TCanvas;

components/tachart/tachartaxis.pas

@@ -23,9 +23,12 @@ uses
 const
   DEF_TICK_LENGTH = 4;
   DEF_TICK_WIDTH = 1;
+  DEF_AXIS_INDEX = -1;
 
 type
 
+  TChartAxisIndex = -1..MaxInt;
+
   { TChartMinorAxis }
 
   TChartMinorAxis = class(TChartBasicAxis)
@@ -118,6 +121,7 @@ type
     FMinors: TChartMinorAxisList;
     FOnGetMarkText: TChartGetAxisMarkTextEvent;
     FOnMarkToText: TChartAxisMarkToTextEvent;
+    FOrthogonalAxisIndex: TChartAxisIndex;
     FPosition: Double;
     FPositionUnits: TChartUnits;
     FRange: TChartRange;
@@ -143,6 +147,7 @@ type
     procedure SetMinors(AValue: TChartMinorAxisList);
     procedure SetOnGetMarkText(AValue: TChartGetAxisMarkTextEvent);
     procedure SetOnMarkToText(AValue: TChartAxisMarkToTextEvent);
+    procedure SetOrthogonalAxisIndex(AValue: TChartAxisIndex);
     procedure SetPosition(AValue: Double);
     procedure SetPositionUnits(AValue: TChartUnits);
     procedure SetRange(AValue: TChartRange);
@@ -168,6 +173,7 @@ type
     procedure Draw;
     procedure DrawTitle(ASize: Integer);
     function GetChart: TCustomChart; inline;
+    function GetOrthogonalAxis: TChartAxis;
     function GetTransform: TChartAxisTransformations;
     function IsDefaultPosition: Boolean;
     function IsFlipped: Boolean; override;
@@ -198,6 +204,8 @@ type
       read FMarginsForMarks write SetMarginsForMarks default true;
     property Marks: TChartAxisMarks read GetMarks write SetMarks;
     property Minors: TChartMinorAxisList read FMinors write SetMinors;
+    property OrthogonalAxisIndex: TChartAxisIndex
+      read FOrthogonalAxisIndex write SetOrthogonalAxisIndex default DEF_AXIS_INDEX;
     property Position: Double read FPosition write SetPosition stored PositionIsStored;
     property PositionUnits: TChartUnits
       read FPositionUnits write SetPositionUnits default cuPercent;
@@ -468,6 +476,7 @@ begin
       Self.FTransformations := Transformations;
       Self.FZPosition := ZPosition;
       Self.FMarginsForMarks := MarginsForMarks;
+      Self.FOrthogonalAxisIndex := OrthogonalAxisIndex;
       Self.FOnGetMarkText := OnGetMarkText;
       Self.FOnMarkToText := OnMarkToText;
     end;
@@ -489,6 +498,7 @@ begin
   FTitle := TChartAxisTitle.Create(ACollection.Owner as TCustomChart);
   FMarginsForMarks := true;
   FMarks.SetInsideDir(1, 0);
+  FOrthogonalAxisIndex := -1;
 end;
 
 destructor TChartAxis.Destroy;
@@ -746,6 +756,20 @@ begin
   Result := TChartAxisMarks(inherited Marks);
 end{%H-}; // to silence the compiler warning of impossible inherited inside inline proc
 
+function TChartAxis.GetOrthogonalAxis: TChartAxis;
+begin
+  Result := nil;
+  if (FOrthogonalAxisIndex = -1) then
+  begin
+    if Collection.Count = 2 then
+      Result := TChartAxisList(Collection)[(Index + 1) mod 2];
+  end else
+    Result := TChartAxisList(Collection)[FOrthogonalAxisIndex];
+
+  if (Result <> nil) and (not (Result.IsVertical xor IsVertical)) then
+    Result := nil;
+end;
+
 function TChartAxis.GetRealTitle: String;
 begin
   if Title.Visible and IsWordwrappedTitle then
@@ -1011,6 +1035,9 @@ end;
 function TChartAxis.PositionToCoord(const ARect: TRect): Integer;
 var
   r: TChartAxisMargins absolute ARect;
+  orthoAx: TChartAxis;
+  t: TChartAxisTransformations;
+  posValue: Double;
 begin
   if IsDefaultPosition then exit(r[Alignment]);
   case PositionUnits of
@@ -1019,12 +1046,23 @@ begin
         r[Alignment],
         r[TChartAxisAlignment((Ord(Alignment) + 2) mod 4)],
         Position * PERCENT));
-    // TODO: Add OrthogonalAxis property to support cuAxis position.
     cuAxis, cuGraph:
-      if IsVertical then
-        Result := FHelper.FTransf.XGraphToImage(Position)
-      else
-        Result := FHelper.FTransf.YGraphToImage(Position);
+      begin
+        posValue := Position;
+        if PositionUnits = cuAxis then
+        begin
+          orthoAx := GetOrthogonalAxis;
+          if orthoAx <> nil then
+          begin
+            t := orthoAx.GetTransform;
+            posValue := t.AxisToGraph(Position);
+          end;
+        end;
+        if IsVertical then
+          Result := FHelper.FTransf.XGraphToImage(posValue)
+        else
+          Result := FHelper.FTransf.YGraphToImage(posValue);
+      end;
     cuPixel:
       Result :=
         r[Alignment] +
@@ -1143,6 +1181,13 @@ begin
   StyleChanged(Self);
 end;
 
+procedure TChartAxis.SetOrthogonalAxisIndex(AValue: TChartAxisIndex);
+begin
+  if FOrthogonalAxisIndex = AValue then exit;
+  FOrthogonalAxisIndex := AValue;
+  StyleChanged(Self);
+end;
+
 procedure TChartAxis.SetPosition(AValue: Double);
 begin
   if SameValue(FPosition, AValue) then exit;

components/tachart/tacustomseries.pas

@@ -21,7 +21,6 @@ uses
   TASources, TAStyles, TATextElements, TATypes;
 
 const
-  DEF_AXIS_INDEX = -1;
   DEF_ERR_ENDLENGTH = 5;
 
 type
@@ -42,8 +41,6 @@ type
     FValue: TDoublePoint;
   end;
 
-  TChartAxisIndex = -1..MaxInt;
-
   { TCustomChartSeries }
 
   TCustomChartSeries = class(TBasicChartSeries)