uellipse.pas

DelphiWin32核心API参考光盘内容.是学习书籍中的源码,便于学习.

unit UEllipse;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
    Timer1: TTimer;
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  {set the canvas's brush to a random color}
  Canvas.Brush.Color := $01000000 or Random(10);

  {draw a random ellipse}
  Ellipse(Canvas.Handle, Random(ClientWidth), Random(ClientHeight),
          Random(ClientWidth), Random(ClientHeight))
end;

end.