本例效果图:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
RadioGroup1: TRadioGroup;
procedure FormCreate(Sender: TObject);
procedure RadioGroup1Click(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure FormDblClick(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
var
pt: TPoint;
RGN_Mode: Integer = RGN_AND;
procedure TForm1.FormCreate(Sender: TObject);
begin
pt.X := Width;
pt.Y := Height;
RadioGroup1.Items.CommaText := 'RGN_AND,RGN_OR,RGN_XOR,RGN_DIFF,RGN_COPY';
RadioGroup1.ItemIndex := 0;
end;
procedure TForm1.RadioGroup1Click(Sender: TObject);
begin
RGN_Mode := RadioGroup1.ItemIndex + 1;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
rgn1,rgn2: HRGN;
begin
rgn1 := CreateEllipticRgn(10,10,110,110);
rgn2 := CreateEllipticRgn(80,10,180,110);
CombineRgn(rgn1, rgn1, rgn2, RGN_Mode);
SetWindowRgn(Handle, rgn1, True);
end;
procedure TForm1.FormDblClick(Sender: TObject);
var
rgn: HRGN;
begin
rgn := CreateRectRgn(0, 0, pt.X, pt.Y);
SetWindowRgn(Handle, rgn, True);
end;
end.
posted on
2008-04-30 21:39
万一
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