本例效果圖:
代碼文件:
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 := '關閉路徑';
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.
窗體文件:
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
