本例效果圖:
代碼文件:unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, ExtCtrls;
type
TForm1 = class(TForm)
Timer1: TTimer;
procedure FormPaint(Sender: TObject);
procedure Timer1Timer(Sender: TObject);
procedure FormCreate(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
var
n: Integer;
procedure TForm1.FormCreate(Sender: TObject);
begin
Timer1.Interval := 100;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
g: TGPGraphics;
p: TGPPen;
begin
g := TGPGraphics.Create(Canvas.Handle);
p := TGPPen.Create(aclChocolate, 8);
p.SetDashStyle(DashStyleDashDotDot);
p.SetDashOffset(n);
g.DrawLine(p, ClientWidth p 2, ClientHeight p 2, 0, 0);
g.DrawLine(p, ClientWidth p 2, ClientHeight p 2, ClientWidth p 2, 0);
g.DrawLine(p, ClientWidth p 2, ClientHeight p 2, ClientWidth, 0);
g.DrawLine(p, ClientWidth p 2, ClientHeight p 2, ClientWidth, ClientHeight p 2);
g.DrawLine(p, ClientWidth p 2, ClientHeight p 2, ClientWidth, ClientHeight);
g.DrawLine(p, ClientWidth p 2, ClientHeight p 2, ClientWidth p 2, ClientHeight);
g.DrawLine(p, ClientWidth p 2, ClientHeight p 2, 0, ClientHeight);
g.DrawLine(p, ClientWidth p 2, ClientHeight p 2, 0, ClientHeight p 2);
Dec(n);
if n > Sqrt(Sqr(ClientWidth) + Sqr(ClientWidth)) then n := 0;
p.Free;
g.Free;
end;
procedure TForm1.Timer1Timer(Sender: TObject);
begin
Repaint;
end;
end.
窗體文件:object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 167
ClientWidth = 242
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 Timer1: TTimer
OnTimer = Timer1Timer
Left = 112
Top = 88
end
end
