TAChart: Add TChartMarks.Clipped property. Update demo.

git-svn-id: trunk@21840 -

components/tachart/demo/dragdrop/main.lfm

@@ -41,6 +41,7 @@ object Form1: TForm1
     OnMouseMove = Chart1MouseMove
     OnMouseUp = Chart1MouseUp
     object Chart1LineSeries1: TLineSeries
+      Marks.Clipped = False
       Marks.Format = '%0:g'
       Marks.Style = smsValue
       OnGetMark = Chart1LineSeries1GetMark

components/tachart/demo/dragdrop/main.lrs

@@ -14,8 +14,9 @@ LazarusResources.Add('TForm1','FORMDATA',[
   +'ft key'#0#13'Title.Visible'#9#5'Align'#7#8'alClient'#14'DoubleBuffered'#9#11
   +'ParentColor'#8#11'OnMouseDown'#7#15'Chart1MouseDown'#11'OnMouseMove'#7#15'C'
   +'hart1MouseMove'#9'OnMouseUp'#7#13'Chart1MouseUp'#0#11'TLineSeries'#17'Chart'
-  +'1LineSeries1'#12'Marks.Format'#6#4'%0:g'#11'Marks.Style'#7#8'smsValue'#9'On'
-  +'GetMark'#7#24'Chart1LineSeries1GetMark'#19'Pointer.Brush.Color'#7#8'clPurpl'
-  +'e'#17'Pointer.HorizSize'#2#6#13'Pointer.Style'#7#9'psDiamond'#16'Pointer.Ve'
-  +'rtSize'#2#6#11'SeriesColor'#7#7'clBlack'#10'ShowPoints'#9#0#0#0#0
+  +'1LineSeries1'#13'Marks.Clipped'#8#12'Marks.Format'#6#4'%0:g'#11'Marks.Style'
+  +#7#8'smsValue'#9'OnGetMark'#7#24'Chart1LineSeries1GetMark'#19'Pointer.Brush.'
+  +'Color'#7#8'clPurple'#17'Pointer.HorizSize'#2#6#13'Pointer.Style'#7#9'psDiam'
+  +'ond'#16'Pointer.VertSize'#2#6#11'SeriesColor'#7#7'clBlack'#10'ShowPoints'#9
+  +#0#0#0#0
 ]);

components/tachart/demo/dragdrop/main.pas

@@ -70,17 +70,14 @@ begin
   Unused(Shift);
   pt := Point(X, Y);
   if
-    TLineSeriesAccess(Chart1LineSeries1).
-      GetNearestPoint(@PointDist, pt, newNearest, img, val)
-  then begin
-    if PointDist(pt, img) <= Sqr(Chart1LineSeries1.Pointer.HorizSize) then begin
-      if newNearest <> FNearestIndex then begin
-        FNearestIndex := newNearest;
-        Chart1.Invalidate;
-      end;
-    end
-    else
-      FNearestIndex := -1;
+    not TLineSeriesAccess(Chart1LineSeries1).
+      GetNearestPoint(@PointDist, pt, newNearest, img, val) or
+    (PointDist(pt, img) > Sqr(Chart1LineSeries1.Pointer.HorizSize))
+  then
+    newNearest := -1;
+  if newNearest <> FNearestIndex then begin
+    FNearestIndex := newNearest;
+    Chart1.Invalidate;
   end;
   if FDragIndex < 0 then exit;
   Chart1LineSeries1.SetXValue(FDragIndex, Chart1.XImageToGraph(X));

components/tachart/tatypes.pas

@@ -270,6 +270,7 @@ type
 
   TChartMarks = class(TChartElement)
   private
+    FClipped: Boolean;
     FDistance: Integer;
     FFormat: String;
     FFrame: TChartPen;
@@ -278,6 +279,7 @@ type
     FLinkPen: TChartLinkPen;
     FStyle: TSeriesMarksStyle;
 
+    procedure SetClipped(const AValue: Boolean);
     procedure SetDistance(const AValue: Integer);
     procedure SetFormat(const AValue: String);
     procedure SetFrame(const AValue: TChartPen);
@@ -294,6 +296,8 @@ type
       ACanvas: TCanvas; const ALabelRect: TRect; const AText: String);
     function IsMarkLabelsVisible: Boolean;
   published
+    // If false, labels may overlap axises and legend.
+    property Clipped: Boolean read FClipped write SetClipped default true;
     // Distance between series point and label.
     property Distance: Integer
       read FDistance write SetDistance default DEF_MARKS_DISTANCE;
@@ -988,6 +992,7 @@ end;
 constructor TChartMarks.Create(AOwner: TCustomChart);
 begin
   inherited Create(AOwner);
+  FClipped := true;
   FDistance := DEF_MARKS_DISTANCE;
   InitHelper(TFPCanvasHelper(FFrame), TChartPen);
   InitHelper(TFPCanvasHelper(FLabelBrush), TChartLabelBrush);
@@ -1010,13 +1015,21 @@ end;
 
 procedure TChartMarks.DrawLabel(
   ACanvas: TCanvas; const ALabelRect: TRect; const AText: String);
+var
+  wasClipping: Boolean = false;
 begin
+  if not Clipped and ACanvas.Clipping then begin
+    ACanvas.Clipping := false;
+    wasClipping := true;
+  end;
   ACanvas.Brush.Assign(LabelBrush);
   ACanvas.Pen.Assign(Frame);
   ACanvas.Rectangle(ALabelRect);
   ACanvas.Font.Assign(LabelFont);
   ACanvas.TextOut(
     ALabelRect.Left + MARKS_MARGIN_X, ALabelRect.Top + MARKS_MARGIN_Y, AText);
+  if wasClipping then
+    ACanvas.Clipping := true;
 end;
 
 function TChartMarks.IsMarkLabelsVisible: Boolean;
@@ -1024,6 +1037,13 @@ begin
   Result := Visible and (Style <> smsNone) and (Format <> '');
 end;
 
+procedure TChartMarks.SetClipped(const AValue: Boolean);
+begin
+  if FClipped = AValue then exit;
+  FClipped := AValue;
+  StyleChanged(Self);
+end;
+
 procedure TChartMarks.SetDistance(const AValue: Integer);
 begin
   if FDistance = AValue then exit;