WinAPI: CloseFigure

本例效果图:

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代码文件:

---

unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls, ExtCtrls;



type

  TForm1 = class(TForm)

    CheckBox1: TCheckBox;

    procedure FormCreate(Sender: TObject);

    procedure FormPaint(Sender: TObject);

    procedure CheckBox1Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



procedure TForm1.FormCreate(Sender: TObject);

begin

  CheckBox1.Caption := '关闭路径';

end;



procedure TForm1.FormPaint(Sender: TObject);

begin

  SetBkMode(Canvas.Handle, TRANSPARENT);



  BeginPath(Canvas.Handle);

  Canvas.MoveTo(10, ClientHeight div 2);

  Canvas.LineTo(ClientWidth div 2, 10);

  Canvas.LineTo(ClientWidth - 10, ClientHeight div 2);

  if CheckBox1.Checked then CloseFigure(Canvas.Handle);

  EndPath(Canvas.Handle);



  Canvas.Pen.Color := clRed;

  StrokePath(Canvas.Handle);

end;



procedure TForm1.CheckBox1Click(Sender: TObject);

begin

  Repaint;

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 373

  Top = 260

  Caption = 'Form1'

  ClientHeight = 175

  ClientWidth = 234

  Color = clBtnFace

  Font.Charset = DEFAULT_CHARSET

  Font.Color = clWindowText

  Font.Height = -11

  Font.Name = 'Tahoma'

  Font.Style = []

  OldCreateOrder = False

  Position = poDesigned

  OnCreate = FormCreate

  OnPaint = FormPaint

  PixelsPerInch = 96

  TextHeight = 13

  object CheckBox1: TCheckBox

    Left = 80

    Top = 136

    Width = 97

    Height = 17

    Caption = 'CheckBox1'

    TabOrder = 0

    OnClick = CheckBox1Click

  end

end