本例效果圖:
代碼文件: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.