unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs, StdCtrls;type  TForm1 = class(TForm)    Button1: TButton;    procedure Button1Click(Sender: TObject);    procedure FormDblClick(Sender: TObject);  end;var  Form1: TForm1;implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);var  rgn: HRGN;begin  BeginPath(Canvas.Handle);  SetBKMode(Canvas.Handle, TRANSPARENT);  Canvas.Font.Size := 56;  Canvas.Font.Style := [fsBold];  Canvas.TextOut(12, 12, 'Delphi');  EndPath(Canvas.Handle);  rgn := PathToRegion(Canvas.Handle);  Self.Color := clRed;  SetWindowRgn(Handle, rgn, True);end;procedure TForm1.FormDblClick(Sender: TObject);begin  Close;end;end.

object Form1: TForm1  Left = 0  Top = 0  Caption = 'Form1'  ClientHeight = 206  ClientWidth = 339  Color = clBtnFace  Font.Charset = DEFAULT_CHARSET  Font.Color = clWindowText  Font.Height = -11  Font.Name = 'Tahoma'  Font.Style = []  OldCreateOrder = False  OnDblClick = FormDblClick  PixelsPerInch = 96  TextHeight = 13  object Button1: TButton    Left = 136    Top = 112    Width = 75    Height = 25    Caption = 'Button1'    TabOrder = 0    OnClick = Button1Click  endend