再學 GDI+[47]: 路徑 - CloseFigure

本例效果圖:

　　代碼文件:unit Unit1;
interface
uses
　Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
　Dialogs, StdCtrls;
type
　TForm1 = class(TForm)
　　CheckBox1: TCheckBox;
　　CheckBox2: TCheckBox;
　　procedure FormCreate(Sender: TObject);
　　procedure FormPaint(Sender: TObject);
　　procedure CheckBox1Click(Sender: TObject);
　　procedure CheckBox2Click(Sender: TObject);
　end;
var
　Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormCreate(Sender: TObject);
begin
　CheckBox1.Caption := '閉合路徑';
　CheckBox2.Caption := '填充路徑';
end;
procedure TForm1.FormPaint(Sender: TObject);
var
　g: TGPGraphics;
　path: TGPGraphicsPath;
　p: TGPPen;
　b: TGPBrush;
　pt1,pt2,pt3: TGPPoint;
begin
　pt1 := MakePoint(0, ClIEntHeight div 2);
　pt2 := MakePoint(ClIEntWidth div 2, 0);
　pt3 := MakePoint(ClientWidth, ClIEntHeight div 2);
　g := TGPGraphics.Create(Canvas.Handle);
　path := TGPGraphicsPath.Create;
　path.AddLine(pt1, pt2);
　path.AddLine(pt2, pt3);
　if CheckBox1.Checked then path.CloseFigure;
　p := TGPPen.Create(aclRed, 2);
　b := TGPSolidBrush.Create(aclYellow);
　if CheckBox2.Checked then g.FillPath(b, path);
　g.DrawPath(p, path);
　b.Free;
　p.Free;
　path.Free;
　g.Free;
end;
procedure TForm1.CheckBox1Click(Sender: TObject);
begin
　Repaint;
end;
procedure TForm1.CheckBox2Click(Sender: TObject);
begin
　Repaint;
end;
end.窗體文件:object Form1: TForm1
　Left = 0
　Top = 0
　Caption = 'Form1'
　ClIEntHeight = 179
　ClIEntWidth = 243
　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 CheckBox1: TCheckBox
　　Left = 44
　　Top = 145
　　Width = 97
　　Height = 17
　　Caption = 'CheckBox1'
　　TabOrder = 0
　　OnClick = CheckBox1Click
　end
　object CheckBox2: TCheckBox
　　Left = 132
　　Top = 145
　　Width = 97
　　Height = 17
　　Caption = 'CheckBox2'
　　TabOrder = 1
　　OnClick = CheckBox2Click
　end
end