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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[55]: 路徑 - Flatten

再學GDI+[55]: 路徑 - Flatten

編輯:Delphi

通過路徑的 Flatten 方法可以把路徑中的曲線拉直, 拉直到什麼程度是由它的第二個參數( 默認0.25)決定的; 它的第一個參數又是一個矩陣變換, 也就是說 Flatten 可以同時進行矩陣 變換, 本例沒有測試它, 其詳情參見:

http://www.cnblogs.com/del/archive/2008/06/20/1226293.html

本例效果圖:

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.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 200
 ClientWidth = 264
 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 = 176
  Width = 265
  Height = 45
  TabOrder = 0
  OnChange = TrackBar1Change
 end
end

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