mainform.pas

Delphi实效编程百例的随书源代码 这是其中的程序控制部分

unit MainForm;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Timer1: TTimer;
    Timer2: TTimer;
    Button3: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure FormMouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure Timer1Timer(Sender: TObject);
    procedure Timer2Timer(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
    xx,yy:integer;
    PT: TPainterThread;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
 // 启动线程
begin
  Button1.Enabled := False;
  Button2.Enabled := True;
  PT := TPainterThread.Create (False);
end;

procedure TForm1.Button2Click(Sender: TObject);
//暂停线程
begin
  PT.Free;
  Button1.Enabled := True;
  Button2.Enabled := False;
end;

procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
//绘制图形
begin
  Canvas.Lock;
  xx:=x;
  yy:=y;
  try
    Canvas.Pen.Color := clYellow;
    Canvas.Brush.Color := clYellow;
    Canvas.Ellipse (x - 30, y - 30, x + 30, y + 30);
  finally
    Canvas.Unlock;
  end;
  timer1.Enabled:=true;
  timer2.Enabled:=true;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
//循环绘制圆形
begin
  Canvas.Lock;
  try
    Canvas.Pen.Color := clYellow;
    Canvas.Brush.Color := clYellow;
    Canvas.Ellipse (xx - 20, yy - 20, xx + 20, yy + 20);
  finally
    Canvas.Unlock;
  end;
  timer1.Enabled:=false;
end;

procedure TForm1.Timer2Timer(Sender: TObject);
begin
  Canvas.Lock;
  try
    Canvas.Pen.Color := clYellow;
    Canvas.Brush.Color := clYellow;
    Canvas.Ellipse (xx - 10, yy - 10, xx + 10, yy + 10);
  finally
    Canvas.Unlock;
  end;
  timer2.Enabled:=false;
end;

procedure TForm1.Button3Click(Sender: TObject);
//退出程序
begin
  close;
end;

end.