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TAChart: New property FullWidth of TChartTitle to draw the title/footer background across the entire chart.

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This commit is contained in:
wp_xyz 2022-12-10 23:43:44 +01:00
parent 3f4356f2bc
commit 8b2c86f689
1 changed files with 41 additions and 1 deletions
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42
components/tachart/tatextelements.pas
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@ -75,7 +75,7 @@ type
procedure DrawLink(
ADrawer: IChartDrawer; ADataPoint, ALabelCenter: TPoint); virtual;
function GetBoundingBox(
ADrawer: IChartDrawer; const ATextSize: TPoint): TRect;
ADrawer: IChartDrawer; const ATextSize: TPoint): TRect; virtual;
function GetTextShiftNeeded: Boolean;
function IsMarginRequired: Boolean;
strict protected
@ -140,6 +140,7 @@ type
FBrush: TBrush;
FCenter: TPoint;
FFont: TFont;
FFullWidth: Boolean;
FFrame: TChartTitleFramePen;
FMargin: TChartDistance;
FPolygon: TPointArray;
@ -152,11 +153,14 @@ type
procedure SetBrush(AValue: TBrush);
procedure SetFont(AValue: TFont);
procedure SetFrame(AValue: TChartTitleFramePen);
procedure SetFullWidth(AValue: Boolean);
procedure SetMargin(AValue: TChartDistance);
procedure SetText(AValue: TStrings);
procedure SetWordwrap(AValue: Boolean);
procedure WordWrapCaption(ADrawer: IChartDrawer; AMaxWidth: Integer);
strict protected
function GetBoundingBox(ADrawer: IChartDrawer;
const ATextSize: TPoint): TRect; override;
function GetFrame: TChartPen; override;
function GetLabelBrush: TBrush; override;
function GetLabelFont: TFont; override;
@ -175,6 +179,7 @@ type
property Brush: TBrush read FBrush write SetBrush;
property Font: TFont read FFont write SetFont;
property Frame: TChartTitleFramePen read FFrame write SetFrame;
property FullWidth: Boolean read FFullWidth write SetFullWidth default false;
property Margin: TChartDistance
read FMargin write SetMargin default DEF_MARGIN;
property OnGetShape;
@ -667,6 +672,34 @@ begin
DrawLabel(ADrawer, FCenter, FCenter, GetRealCaption, FPolygon);
end;
function TChartTitle.GetBoundingBox(
ADrawer: IChartDrawer; const ATextSize: TPoint): TRect;
begin
Result := inherited;
if FullWidth then
begin
case Alignment of
taLeftJustify:
begin
Result.Left := -ATextSize.X div 2 - Margins.Left;
Result.Right := Result.Left + FOwner.Width;
FCenter.X := ATextSize.X div 2 + Margins.Left;
end;
taRightJustify:
begin
Result.Right := ATextSize.X div 2 + Margins.Right;
Result.Left := Result.Right - FOwner.Width;
FCenter.X := FOwner.Width - ATextSize.X div 2 - Margins.Right;
end;
taCenter:
begin
Result.Left := -FOwner.Width div 2;
Result.Right := +FOwner.Width div 2;
end;
end;
end;
end;
function TChartTitle.GetFrame: TChartPen;
begin
Result := Frame;
@ -738,6 +771,13 @@ begin
StyleChanged(Self);
end;
procedure TChartTitle.SetFullWidth(AValue: Boolean);
begin
if FFullWidth = AValue then exit;
FFullWidth := AValue;
StyleChanged(Self);
end;
procedure TChartTitle.SetMargin(AValue: TChartDistance);
begin
if FMargin = AValue then exit;