再学GDI+[80]: 区域(9)

本例效果图:

代码文件:unit Unit1;
interface
uses
　Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
　Dialogs, StdCtrls, ComCtrls;
type
　TForm1 = class(TForm)
　　procedure FormPaint(Sender: TObject);
　end;
var
　Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormPaint(Sender: TObject);
var
　g: TGPGraphics;
　b: TGPBrush;
　rgn: TGPRegion;
　RegionHandle: HRGN;
begin
　g := TGPGraphics.Create(Canvas.Handle);
　b := TGPHatchBrush.Create(HatchStyleDiagonalCross, aclSilver, aclLemonChiffon);
　rgn := TGPRegion.Create(MakeRect(40.0, 40, ClientWidth-80, ClientHeight-80));
　g.FillRegion(b, rgn);
　RegionHandle := rgn.GetHRGN(g);
　Canvas.Brush.Color := clRed;
　FrameRgn(Canvas.Handle, RegionHandle, Canvas.Brush.Handle, 2, 2);
　DeleteObject(RegionHandle);
　rgn.Free;
　b.Free;
　g.Free;
end;
end.

窗体文件:object Form1: TForm1
　Left = 0
　Top = 0
　Caption = 'Form1'
　ClientHeight = 162
　ClientWidth = 197
　Color = clBtnFace
　Font.Charset = DEFAULT_CHARSET
　Font.Color = clWindowText
　Font.Height = -11
　Font.Name = 'Tahoma'
　Font.Style = []
　OldCreateOrder = False
　Position = poDesktopCenter
　OnPaint = FormPaint
　PixelsPerInch = 96
　TextHeight = 13
end