unit1.pas

delphi编程实效百例的随书源代码 这是其中的界面外观部分

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    OpenDialog1: TOpenDialog;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
var
  i,j:integer;
begin
  for i:=0 to form1.height do
    for j:=0 to form1.width do
      Form1.canvas.Pixels[j,i]:=$100*random(256);
end;


procedure TForm1.Button2Click(Sender: TObject);
var
  i:word;
  dy,y:real;
begin
  dy:=Form1.Height/256;
  y:=0;
  for i:=255 downto 0 do
  begin
    Form1.Canvas.Brush.Color:=$00000000+i*$100;
    Form1.Canvas.FillRect(rect(0,Round(y),Form1.Width,Round(y+dy)));
    y:=y+dy;
    //创建一个渐进背景
  end;
end;


procedure TForm1.Button3Click(Sender: TObject);
  var
    bitmap:tbitmap;
    rect1:trect;
begin
  rect1.left:=0;
  //在窗体的显示区域上设置图像
  rect1.right:=width;
  rect1.top:=0;
  rect1.bottom:=height;
  bitmap:=tbitmap.create;
  //创建对象
  opendialog1.filter:='bitmap file(*.bmp)|*.bmp';
  //设置打开图像类型的过滤
  if opendialog1.Execute then
  begin
    bitmap.loadfromfile(opendialog1.filename);
    //导入BMP图像文件
    form1.canvas.stretchdraw(rect1,bitmap);
    //画布重绘
    bitmap.freeimage;
  end;
end;


procedure TForm1.Button4Click(Sender: TObject);
begin
  form1.Close;
end;

end.