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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 路徑 - Flatten

路徑 - Flatten

編輯:Delphi
代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, ComCtrls;
type
 TForm1 = class(TForm)
  TrackBar1: TTrackBar;
  procedure FormPaint(Sender: TObject);
  procedure FormCreate(Sender: TObject);
  procedure TrackBar1Change(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormCreate(Sender: TObject);
begin
 TrackBar1.Height := 23;
 TrackBar1.ShowSelRange := False;
 TrackBar1.Min := -5000;
 TrackBar1.Max := 5000;
 TrackBar1.Position := 25;
 TrackBar1.PageSize := 5;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 p: TGPPen;
 path: TGPGraphicsPath;
 f: Single;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 p := TGPPen.Create(aclBlue, 2);
 path := TGPGraphicsPath.Create;
 path.AddEllipse(20, 20, ClientWidth-40, ClIEntHeight- 80);
 f := TrackBar1.Position / 100;
 path.Flatten(nil, f);
 Text := Format('%f', [f]);
 g.DrawPath(p, path);
 path.Free;
 p.Free;
 g.Free;
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
begin
 Repaint;
end;
end.
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