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再学GDI+[80]: 区域(9) - GetHRGN - 转为GDI的区域句柄

时间:2012-05-23 | 栏目:Delphi教程 | 点击:

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

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