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再学GDI+[78]: 区域(7) - Translate - 区域的平移变换

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)
  TrackBar1: TTrackBar;
  TrackBar2: TTrackBar;
  procedure FormPaint(Sender: TObject);
  procedure FormCreate(Sender: TObject);
  procedure TrackBar1Change(Sender: TObject);
  procedure TrackBar2Change(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormCreate(Sender: TObject);
begin
 TrackBar1.Min := -ClientWidth p 2;
 TrackBar1.Max := ClientWidth p 2;
 TrackBar2.Min := -ClientHeight p 2;
 TrackBar2.Max := ClientHeight p 2;
 DoubleBuffered := True;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 b: TGPBrush;
 rgn: TGPRegion;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 b := TGPHatchBrush.Create(HatchStyleShingle, aclSilver, aclDarkCyan);
 rgn := TGPRegion.Create(MakeRect(40, 40, ClientWidth-100, ClientHeight-100));
 rgn.Translate(TrackBar1.Position, TrackBar2.Position);
 g.FillRegion(b, rgn);
 rgn.Free;
 b.Free;
 g.Free;
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.TrackBar2Change(Sender: TObject);
begin
 Repaint;
end;
end.

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