本例效果圖:

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代碼文件:

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unit Unit1;interfaceusesWindows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,Dialogs, StdCtrls, ExtCtrls;typeTForm1 = class(TForm)CheckBox1: TCheckBox;procedure FormCreate(Sender: TObject);procedure FormPaint(Sender: TObject);procedure CheckBox1Click(Sender: TObject);end;varForm1: TForm1;implementation{$R *.dfm}procedure TForm1.FormCreate(Sender: TObject); beginCheckBox1.Caption := '關閉路徑'; end;procedure TForm1.FormPaint(Sender: TObject); beginSetBkMode(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); beginRepaint; end;end. 窗體文件:

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object Form1: TForm1Left = 373Top = 260Caption = 'Form1'ClientHeight = 175ClientWidth = 234Color = clBtnFaceFont.Charset = DEFAULT_CHARSETFont.Color = clWindowTextFont.Height = -11Font.Name = 'Tahoma'Font.Style = []OldCreateOrder = FalsePosition = poDesignedOnCreate = FormCreateOnPaint = FormPaintPixelsPerInch = 96TextHeight = 13object CheckBox1: TCheckBoxLeft = 80Top = 136Width = 97Height = 17Caption = 'CheckBox1'TabOrder = 0OnClick = CheckBox1Clickend end

轉載于:https://www.cnblogs.com/del/archive/2008/05/24/1206195.html

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