button.pas

《深入Delphi的多媒体编程》实例源代码

unit button;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    procedure Button3Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button3Click(Sender: TObject);
var
x,y,i:integer;
begin
x:=0;
y:=0;
form1.canvas.pen.width:=1;
for i:=0 to 8 do
begin
form1.canvas.pen.color:=$00404040;
form1.canvas.moveto(Button1.left+Button1.width+x,
                         Button1.top+8);
form1.canvas.lineto(Button1.left+Button1.width+x,
                         Button1.top+button1.height+8);
form1.canvas.moveto(Button1.left+8,
                         Button1.top+Button1.height+y);
form1.canvas.lineto(Button1.left+Button1.width+8,
                         Button1.top+button1.height+y);
x:=x+1;
y:=y+1;
end;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
x,y,i:integer;
begin
x:=0;
y:=0;
form1.canvas.pen.width:=1;
for i:=0 to 8 do
begin
form1.canvas.pen.color:=$00a0a0a0;
form1.canvas.moveto(Button1.left+Button1.width+x,
                      Button1.top+y);
form1.canvas.lineto(Button1.left+Button1.width+x,
                      Button1.top+button1.height+y);
form1.canvas.pen.color:=$00606060;
form1.canvas.moveto(Button1.left+x,
                      Button1.top+Button1.height+y);
form1.canvas.lineto(Button1.left+Button1.width+x,
                      Button1.top+button1.height+y);
x:=x+1;
y:=y+1;
end;
end;

end.