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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[78]: 區域(7) - Translate - 區域的平移變換

再學GDI+[78]: 區域(7) - Translate - 區域的平移變換

編輯:Delphi

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 div 2;
 TrackBar1.Max := ClientWidth div 2;
 TrackBar2.Min := -ClientHeight div 2;
 TrackBar2.Max := ClientHeight div 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.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 174
 ClientWidth = 219
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 Position = poDesktopCenter
 OnCreate = FormCreate
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
 object TrackBar1: TTrackBar
  Left = 0
  Top = 151
  Width = 217
  Height = 23
  ShowSelRange = False
  TabOrder = 1
  OnChange = TrackBar1Change
 end
 object TrackBar2: TTrackBar
  Left = 196
  Top = 0
  Width = 23
  Height = 166
  Orientation = trVertical
  ShowSelRange = False
  TabOrder = 0
  OnChange = TrackBar2Change
 end
end

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