unit1.pas

来自「学习Delphi最好的教材。通过一个个简单而实用的实例」· PAS 代码 · 共 58 行

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Timer1: TTimer;
    procedure FormPaint(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  x:Integer=20;
  y:Integer=20;

implementation

{$R *.dfm}

procedure TForm1.FormPaint(Sender: TObject);
begin
  Canvas.Brush.Color:=clRed;
  Canvas.Rectangle(x,y,x+20,y+80);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  x:=x+20;
  Repaint;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  x:=x-20;
  Repaint;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  y:=y+20;
  Repaint;
end;

end.