本例演示了把路径中的数据保存到一个文本文件, 然后再读出的过程.
本例效果图:
![](https://www.cnblogs.com/images/cnblogs_com/del/138617/o_86211.gif)
代码文件:
本例效果图:
![](https://www.cnblogs.com/images/cnblogs_com/del/138617/o_86211.gif)
代码文件:
unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls; type TForm1 = class(TForm) Button1: TButton; Button2: TButton; procedure FormCreate(Sender: TObject); procedure FormDestroy(Sender: TObject); procedure FormPaint(Sender: TObject); procedure Button1Click(Sender: TObject); procedure Button2Click(Sender: TObject); end; var Form1: TForm1; implementation {$R *.dfm} uses GDIPOBJ, GDIPAPI; const FilePath = 'c:\temp\path.txt'; var path: TGPGraphicsPath; p: TGPPen; procedure TForm1.FormCreate(Sender: TObject); var pts: array[0..6] of TGPPoint; rect: TGPRect; begin pts[0].X := 10; pts[0].Y := 50; pts[1].X := 40; pts[1].Y := 90; pts[2].X := 80; pts[2].Y := 10; pts[3].X := 110; pts[3].Y := 50; pts[4].X := 140; pts[4].Y := 10; pts[5].X := 180; pts[5].Y := 90; pts[6].X := 210; pts[6].Y := 50; path := TGPGraphicsPath.Create; path.AddBeziers(PGPPoint(@pts), Length(pts)); path.GetBounds(rect); path.AddEllipse(rect); p := TGPPen.Create(aclBlue, 2); Button1.Caption := '保存路径数据'; Button2.Caption := '读取路径数据'; end; procedure TForm1.FormDestroy(Sender: TObject); begin path.Free; p.Free; end; procedure TForm1.FormPaint(Sender: TObject); var g: TGPGraphics; begin g := TGPGraphics.Create(Canvas.Handle); g.DrawPath(p, path); g.Free; end; procedure TForm1.Button1Click(Sender: TObject); var points: array of TGPPoint; types: array of Byte; List: TStringList; i: Integer; begin SetLength(points, path.GetPointCount); SetLength(types, path.GetPointCount); path.GetPathPoints(PGPPoint(points), Length(points)); path.GetPathTypes(PByte(types), Length(types)); List := TStringList.Create; for i := 0 to Length(points) - 1 do List.Add(Format('%d,%d,%d', [points[i].X, points[i].Y, types[i]])); List.SaveToFile(FilePath); List.Free; Text := FilePath; end; procedure TForm1.Button2Click(Sender: TObject); var points: array of TGPPoint; types: array of Byte; List1,List2: TStringList; i: Integer; begin List1 := TStringList.Create; List2 := TStringList.Create; if not FileExists(FilePath) then Exit; List1.LoadFromFile(FilePath); SetLength(points, List1.Count); SetLength(types, List1.Count); for i := 0 to List1.Count - 1 do begin if List1[i] = '' then Break; List2.CommaText := List1[i]; points[i].X := StrToIntDef(List2[0], 0); points[i].Y := StrToIntDef(List2[1], 0); types[i] := StrToIntDef(List2[2], 0); end; path.Reset; path.Free; path := TGPGraphicsPath.Create(PGPPoint(points), PByte(types), List1.Count); p.SetColor(aclRed); Repaint; List1.Free; List2.Free; end; end.窗体文件:
object Form1: TForm1 Left = 0 Top = 0 Caption = 'Form1' ClientHeight = 147 ClientWidth = 224 Color = clBtnFace Font.Charset = DEFAULT_CHARSET Font.Color = clWindowText Font.Height = -11 Font.Name = 'Tahoma' Font.Style = [] OldCreateOrder = False Position = poDesktopCenter OnCreate = FormCreate OnDestroy = FormDestroy OnPaint = FormPaint PixelsPerInch = 96 TextHeight = 13 object Button1: TButton Left = 13 Top = 114 Width = 94 Height = 25 Caption = 'Button1' TabOrder = 0 OnClick = Button1Click end object Button2: TButton Left = 117 Top = 114 Width = 94 Height = 25 Caption = 'Button2' TabOrder = 1 OnClick = Button2Click end end