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{
*****************************************************************************
See the file COPYING.modifiedLGPL.txt, included in this distribution,
for details about the license.
*****************************************************************************
Authors: Alexander Klenin
}
unit TADiagramDrawing;
{$H+}
interface
uses
Classes, FPCanvas,
TADrawUtils, TADiagram;
type
TDiaContextDrawer = class(TDiaContext)
private
FDrawer: IChartDrawer;
public
property Drawer: IChartDrawer read FDrawer write FDrawer;
end;
IDiaDrawerDecorator = interface
['{A2AB054F-D725-401D-A249-18BF03CFF6FA}']
procedure Apply(ADrawer: IChartDrawer);
end;
TDiaBrushDecorator = class(TDiaDecorator, IDiaDrawerDecorator)
private
FBrush: TFPCustomBrush;
public
constructor Create(AOwner: TDiaDecoratorList);
destructor Destroy; override;
procedure Apply(ADrawer: IChartDrawer);
property Brush: TFPCustomBrush read FBrush;
end;
TDiaFontDecorator = class(TDiaDecorator, IDiaDrawerDecorator)
private
FFont: TFPCustomFont;
public
constructor Create(AOwner: TDiaDecoratorList);
destructor Destroy; override;
procedure Apply(ADrawer: IChartDrawer);
property Font: TFPCustomFont read FFont;
end;
TDiaPenDecorator = class(TDiaDecorator, IDiaDrawerDecorator)
private
FPen: TFPCustomPen;
public
constructor Create(AOwner: TDiaDecoratorList);
destructor Destroy; override;
procedure Apply(ADrawer: IChartDrawer);
property Pen: TFPCustomPen read FPen;
end;
implementation
uses
Math, Types, SysUtils,
TAGeometry;
function ToImage(const AP: TDiaPoint): TPoint; inline;
begin
Result := RoundPoint(AP.AsUnits(duPixels));
end;
procedure DrawDiaBox(ASelf: TDiaBox);
var
id: IChartDrawer;
d: IDiaDecorator;
begin
id := (ASelf.Owner.Context as TDiaContextDrawer).Drawer;
id.PrepareSimplePen($000000);
id.SetBrushColor($FFFFFF);
for d in ASelf.Decorators do
if d is IDiaDrawerDecorator then
(d as IDiaDrawerDecorator).Apply(id);
with ASelf do
id.Polygon([
ToImage(FTopLeft), ToImage(FTopRight),
ToImage(FBottomRight), ToImage(FBottomLeft)
], 0, 4);
id.TextOut.Pos(ToImage(ASelf.FTopLeft) + Point(4, 4)).Text(ASelf.Caption).Done;
end;
procedure DrawEndPoint(
ADrawer: IChartDrawer; AEndPoint: TDiaEndPoint;
const APos: TPoint; AAngle: Double);
var
da: Double;
diag: Integer;
pt1, pt2: TPoint;
d: IDiaDecorator;
begin
ADrawer.SetPenParams(psSolid, $000000);
ADrawer.SetBrushColor($FFFFFF);
for d in AEndPoint.Decorators do
if d is IDiaDrawerDecorator then
(d as IDiaDrawerDecorator).Apply(ADrawer);
da := ArcTan2(AEndPoint.Width.Value, AEndPoint.Length.Value);
diag := -Round(Sqrt(Sqr(AEndPoint.Length.Value) + Sqr(AEndPoint.Width.Value)));
pt1 := APos + RotatePointX(diag, AAngle - da);
pt2 := APos + RotatePointX(diag, AAngle + da);
case AEndPoint.Shape of
depsClosedArrow: ADrawer.Polygon([pt1, APos, pt2], 0, 3);
depsOpenArrow: ADrawer.Polyline([pt1, APos, pt2], 0, 3);
end;
end;
procedure DrawDiaLink(ASelf: TDiaLink);
var
id: IChartDrawer;
startPos, endPos, p: TPoint;
d: IDiaDecorator;
begin
if (ASelf.Start.Connector = nil) or (ASelf.Finish.Connector = nil) then exit;
id := (ASelf.Owner.Context as TDiaContextDrawer).Drawer;
id.PrepareSimplePen($000000);
for d in ASelf.Decorators do
if d is IDiaDrawerDecorator then
(d as IDiaDrawerDecorator).Apply(id);
startPos := ToImage(ASelf.Start.Connector.ActualPos);
endPos := ToImage(ASelf.Finish.Connector.ActualPos);
case ASelf.Routing of
dlrStraight: begin
id.Line(startPos, endPos);
p := startPos;
end;
dlrXThenY: begin
p := Point(endPos.X, startPos.Y);
id.Polyline([startPos, p, endPos], 0, 3);
end;
dlrYThenX: begin
p := Point(startPos.X, endPos.Y);
id.Polyline([startPos, p, endPos], 0, 3);
end;
end;
if ASelf.Start.Shape <> depsNone then
with p - endPos do
DrawEndPoint(id, ASelf.Start, startPos, ArcTan2(Y, X));
if ASelf.Finish.Shape <> depsNone then
with endPos - p do
DrawEndPoint(id, ASelf.Finish, endPos, ArcTan2(Y, X));
end;
{ TDiaBrushDecorator }
procedure TDiaBrushDecorator.Apply(ADrawer: IChartDrawer);
begin
ADrawer.Brush := Brush;
end;
constructor TDiaBrushDecorator.Create(AOwner: TDiaDecoratorList);
begin
inherited Create(AOwner);
FBrush := TFPCustomBrush.Create;
end;
destructor TDiaBrushDecorator.Destroy;
begin
FreeAndNil(FBrush);
inherited;
end;
{ TDiaFontDecorator }
procedure TDiaFontDecorator.Apply(ADrawer: IChartDrawer);
begin
ADrawer.Font := Font;
end;
constructor TDiaFontDecorator.Create(AOwner: TDiaDecoratorList);
begin
inherited Create(AOwner);
FFont := TFPCustomFont.Create;
end;
destructor TDiaFontDecorator.Destroy;
begin
FreeAndNil(FFont);
inherited Destroy;
end;
{ TDiaPenDecorator }
procedure TDiaPenDecorator.Apply(ADrawer: IChartDrawer);
begin
ADrawer.Pen := Pen;
end;
constructor TDiaPenDecorator.Create(AOwner: TDiaDecoratorList);
begin
inherited Create(AOwner);
FPen := TFPCustomPen.Create;
FPen.Mode := pmCopy;
end;
destructor TDiaPenDecorator.Destroy;
begin
FreeAndNil(FPen);
inherited;
end;
initialization
TDiaBox.FInternalDraw := @DrawDiaBox;
TDiaLink.FInternalDraw := @DrawDiaLink;
end.
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