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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[35]: TGPPen - 虛線畫筆位移 - SetDashOffset

再學GDI+[35]: TGPPen - 虛線畫筆位移 - SetDashOffset

編輯:Delphi

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 div 2, ClientHeight div 2, 0, 0);
 g.DrawLine(p, ClientWidth div 2, ClientHeight div 2, ClientWidth div 2, 0);
 g.DrawLine(p, ClientWidth div 2, ClientHeight div 2, ClientWidth, 0);
 g.DrawLine(p, ClientWidth div 2, ClientHeight div 2, ClientWidth, ClientHeight div 2);
 g.DrawLine(p, ClientWidth div 2, ClientHeight div 2, ClientWidth, ClientHeight);
 g.DrawLine(p, ClientWidth div 2, ClientHeight div 2, ClientWidth div 2, ClientHeight);
 g.DrawLine(p, ClientWidth div 2, ClientHeight div 2, 0, ClientHeight);
 g.DrawLine(p, ClientWidth div 2, ClientHeight div 2, 0, ClientHeight div 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

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