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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[34]: TGPPen - 畫筆的縮放變換 - ScaleTransform

再學GDI+[34]: TGPPen - 畫筆的縮放變換 - ScaleTransform

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 FormCreate(Sender: TObject);
  procedure FormPaint(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.ShowSelRange := False;
 TrackBar1.Height := 20;
 TrackBar1.Min := 1;
 TrackBar1.Max := 100;
 TrackBar1.Position := 10;
 TrackBar2.ShowSelRange := False;
 TrackBar2.Height := 20;
 TrackBar2.Min := 1;
 TrackBar2.Max := 100;
 TrackBar2.Position := 10;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 p: TGPPen;
 r: TRect;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 p := TGPPen.Create(aclBrown, 3);
 p.ScaleTransform(TrackBar1.Position / 10, TrackBar2.Position / 10);
 r := ClientRect;
 InflateRect(r, -30, -30);
 OffsetRect(r, 0, -10);
 g.DrawEllipse(p, MakeRect(r));
 p.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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