main.pas

《Kylix程序设计》一书中附带的例程源代码

unit Main;

interface

uses
  SysUtils, Types, Classes, Variants, QGraphics, QControls, QForms, QDialogs,
  QStdCtrls, QExtCtrls;

type
  TFrmMain = class(TForm)
    PaintBox: TPaintBox;
    BtnDrawShape: TButton;
    BtnPoint: TButton;
    BtnLine: TButton;
    BtnRect: TButton;
    procedure BtnDrawShapeClick(Sender: TObject);
    procedure BtnPointClick(Sender: TObject);
    procedure BtnLineClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  FrmMain: TFrmMain;

implementation

uses Shapes;

{$R *.xfm}

procedure TFrmMain.BtnDrawShapeClick(Sender: TObject);
var
  Shape: TGeoShape;
begin
  PaintBox.Canvas.Pen.Width := 3;
  Shape := TGeoShape.Create();
  Shape.Draw( PaintBox.Canvas );
  FreeAndNil( Shape );
end;

procedure TFrmMain.BtnPointClick(Sender: TObject);
var
  Point: TGeoPoint;
begin
  PaintBox.Canvas.Pen.Width := 3;
  Point := TGeoPoint.Create( 20, 20 );
  Point.Draw( PaintBox.Canvas );
  FreeAndNil( Point );
end;

procedure TFrmMain.BtnLineClick(Sender: TObject);
var
  Line: TGeoLine;
begin
  PaintBox.Canvas.Pen.Width := 3;
  Line := TGeoLine.Create( 10, 50, 300, 50 );
  Line.Draw( PaintBox.Canvas );
// Draw a point!
//  TGeoPoint(Line).Draw( PaintBox.Canvas );
  Line.MoveTo( PaintBox.Canvas, 30, 30 );
  Line.LineTo( PaintBox.Canvas, 200, 200 );
  FreeAndNil( Line );
end;

end.