unit1.pas

Delphi7应用编程150例附书源码.rar

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Timer1: TTimer;
    Image1: TImage;
    procedure FormCreate(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  X1,X2,Y1,Y2:Integer;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
    Randomize();
    self.Canvas.Brush.Style:=bsClear;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
    Image1.Canvas.Pen.Mode:=pmNotXor;
    Image1.Canvas.Ellipse(X1,Y1,X2,Y2);
    X1:=Random(Image1.Width);
    X2:=Random(Image1.Width);
    Y1:=Random(Image1.Height);
    Y2:=Random(Image1.Height);
    Image1.Canvas.Pen.Mode:=pmCopy;
    Image1.Canvas.Ellipse(X1,Y1,X2,Y2);
end;

end.