TAChart: Add initial support for shadows

git-svn-id: trunk@40050 -

components/tachart/tacustomseries.pas

@@ -66,6 +66,7 @@ type
     function GetShowInLegend: Boolean; override;
     procedure SetActive(AValue: Boolean); override;
     procedure SetDepth(AValue: TChartDistance); override;
+    procedure SetShadow(AValue: TChartShadow); override;
     procedure SetShowInLegend(AValue: Boolean); override;
     procedure SetTitle(AValue: String); virtual;
     procedure SetTransparency(AValue: TChartTransparency); override;
@@ -118,10 +119,11 @@ type
 
   published
     property Legend: TChartSeriesLegend read FLegend write SetLegend;
-    property Transparency;
+    property Shadow;
     property ShowInLegend: Boolean
       read GetShowInLegend write SetShowInLegend stored false default true;
       deprecated;
+    property Transparency;
   end;
 
   TChartGetMarkEvent = procedure (
@@ -323,12 +325,14 @@ begin
   FAxisIndexX := DEF_AXIS_INDEX;
   FAxisIndexY := DEF_AXIS_INDEX;
   FLegend := TChartSeriesLegend.Create(FChart);
+  FShadow := TChartShadow.Create(FChart);
 end;
 
 destructor TCustomChartSeries.Destroy;
 begin
   FreeAndNil(FLegend);
-  inherited Destroy;
+  FreeAndNil(FShadow);
+  inherited;
 end;
 
 function TCustomChartSeries.GetAxisX: TChartAxis;
@@ -520,6 +524,13 @@ begin
     (AParent as TChart).AddSeries(Self);
 end;
 
+procedure TCustomChartSeries.SetShadow(AValue: TChartShadow);
+begin
+  if FShadow = AValue then exit;
+  FShadow.Assign(AValue);
+  UpdateParentChart;
+end;
+
 procedure TCustomChartSeries.SetShowInLegend(AValue: Boolean);
 begin
   Legend.Visible := AValue;

components/tachart/tagraph.pas

@@ -48,6 +48,7 @@ type
     FActive: Boolean;
     FChart: TChart;
     FDepth: TChartDistance;
+    FShadow: TChartShadow;
     FTransparency: TChartTransparency;
     FZPosition: TChartDistance;
 
@@ -58,6 +59,7 @@ type
     function GetShowInLegend: Boolean; virtual; abstract;
     procedure SetActive(AValue: Boolean); virtual; abstract;
     procedure SetDepth(AValue: TChartDistance); virtual; abstract;
+    procedure SetShadow(AValue: TChartShadow); virtual; abstract;
     procedure SetShowInLegend(AValue: Boolean); virtual; abstract;
     procedure SetTransparency(AValue: TChartTransparency); virtual; abstract;
     procedure SetZPosition(AValue: TChartDistance); virtual; abstract;
@@ -85,6 +87,7 @@ type
     property Active: Boolean read FActive write SetActive default true;
     property Depth: TChartDistance read FDepth write SetDepth default 0;
     property ParentChart: TChart read FChart;
+    property Shadow: TChartShadow read FShadow write SetShadow;
     property Transparency: TChartTransparency
       read FTransparency write SetTransparency default 0;
     property ZPosition: TChartDistance read FZPosition write SetZPosition default 0;
@@ -674,15 +677,32 @@ end;
 
 procedure TChart.DisplaySeries(ADrawer: IChartDrawer);
 
-  procedure OffsetDrawArea(AZPos, ADepth: Integer);
+  procedure OffsetDrawArea(ADX, ADY: Integer); inline;
   begin
-    FOffset.X -= AZPos;
-    FOffset.Y += AZPos;
-    OffsetRect(FClipRect, -AZPos, AZPos);
+    FOffset.X += ADX;
+    FOffset.Y += ADY;
+    OffsetRect(FClipRect, ADX, ADY);
+  end;
+
+  procedure OffsetWithDepth(AZPos, ADepth: Integer);
+  begin
+    OffsetDrawArea(-AZPos, AZPos);
     FClipRect.Right += ADepth;
     FClipRect.Top -= ADepth;
   end;
 
+  procedure DrawOrDeactivate(
+    ASeries: TBasicChartSeries; ATransparency: TChartTransparency);
+  begin
+    try
+      ADrawer.SetTransparency(ATransparency);
+      ASeries.Draw(ADrawer);
+    except
+      ASeries.Active := false;
+      raise;
+    end;
+  end;
+
 var
   axisIndex: Integer;
   seriesInZOrder: TChartSeriesList;
@@ -700,18 +720,24 @@ begin
         // Interleave axises with series according to ZPosition.
         if AxisVisible then
           AxisList.Draw(s.ZPosition, axisIndex);
-        OffsetDrawArea(Min(s.ZPosition, Depth), Min(s.Depth, Depth));
+        OffsetWithDepth(Min(s.ZPosition, Depth), Min(s.Depth, Depth));
         ADrawer.ClippingStart(ClipRectWithoutFrame(s.ZPosition));
+
         try
-          try
-            ADrawer.SetTransparency(s.Transparency);
-            s.Draw(ADrawer);
-          except
-            s.Active := false;
-            raise;
-          end;
+          with s.Shadow do
+            if Visible then begin
+              OffsetDrawArea(OffsetX, OffsetY);
+              ADrawer.SetMonochromeColor(Color);
+              try
+                DrawOrDeactivate(s, Transparency);
+              finally
+                ADrawer.SetMonochromeColor(clTAColor);
+                OffsetDrawArea(-OffsetX, -OffsetY);
+              end;
+            end;
+          DrawOrDeactivate(s, s.Transparency);
         finally
-          OffsetDrawArea(-Min(s.ZPosition, Depth), -Min(s.Depth, Depth));
+          OffsetWithDepth(-Min(s.ZPosition, Depth), -Min(s.Depth, Depth));
           ADrawer.ClippingStop;
         end;
       end;

components/tachart/tatypes.pas

@@ -38,6 +38,8 @@ const
   MARKS_YINDEX_ALL = -1;
   DEF_ARROW_LENGTH = 10;
   DEF_ARROW_WIDTH = 5;
+  DEF_SHADOW_OFFSET = 8;
+  DEF_SHADOW_TRANSPARENCY = 128;
 
 type
   TCustomChart = class(TCustomControl)
@@ -235,6 +237,28 @@ type
       read FWidth write SetWidth default DEF_ARROW_WIDTH;
   end;
 
+  TChartShadow = class(TChartElement)
+  strict private
+    FColor: TColor;
+    FOffset: TPoint;
+    FTransparency: TChartTransparency;
+    procedure SetColor(AValue: TColor);
+    procedure SetOffsetX(AValue: Integer);
+    procedure SetOffsetY(AValue: Integer);
+    procedure SetTransparency(AValue: TChartTransparency);
+  public
+    constructor Create(AOwner: TCustomChart);
+  public
+    procedure Assign(ASource: TPersistent); override;
+  published
+    property Color: TColor read FColor write SetColor default clBlack;
+    property OffsetX: Integer read FOffset.X write SetOffsetX default DEF_SHADOW_OFFSET;
+    property OffsetY: Integer read FOffset.Y write SetOffsetY default DEF_SHADOW_OFFSET;
+    property Transparency: TChartTransparency
+      read FTransparency write SetTransparency default DEF_SHADOW_TRANSPARENCY;
+    property Visible default false;
+  end;
+
 implementation
 
 uses
@@ -666,5 +690,54 @@ begin
   StyleChanged(Self);
 end;
 
+{ TChartShadow }
+
+procedure TChartShadow.Assign(ASource: TPersistent);
+begin
+  if ASource is TChartShadow then
+    with TChartShadow(ASource) do begin
+      Self.FColor := Color;
+      Self.FOffset := FOffset;
+      Self.FTransparency := Transparency;
+    end;
+  inherited Assign(ASource);
+end;
+
+constructor TChartShadow.Create(AOwner: TCustomChart);
+begin
+  inherited Create(AOwner);
+  FColor := clBlack;
+  FOffset := Point(DEF_SHADOW_OFFSET, DEF_SHADOW_OFFSET);
+  FTransparency := DEF_SHADOW_TRANSPARENCY;
+end;
+
+procedure TChartShadow.SetColor(AValue: TColor);
+begin
+  if FColor = AValue then exit;
+  FColor := AValue;
+  StyleChanged(Self);
+end;
+
+procedure TChartShadow.SetOffsetX(AValue: Integer);
+begin
+  if FOffset.X = AValue then exit;
+  FOffset.X := AValue;
+  StyleChanged(Self);
+end;
+
+procedure TChartShadow.SetOffsetY(AValue: Integer);
+begin
+  if FOffset.Y = AValue then exit;
+  FOffset.Y := AValue;
+  StyleChanged(Self);
+end;
+
+procedure TChartShadow.SetTransparency(AValue: TChartTransparency);
+begin
+  if FTransparency = AValue then exit;
+  FTransparency := AValue;
+  StyleChanged(Self);
+end;
+
 end.