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;

type
  TfrmMain = class(TForm)
    Image1: TImage;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure Image1MouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure Image1MouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  frmMain: TfrmMain;
  Bitmap:TBitmap;
  Flag:Boolean;
  PointX,PointY:Integer;
implementation

{$R *.dfm}

procedure TfrmMain.FormCreate(Sender: TObject);
begin
    Bitmap:=TBitmap.Create;
    Bitmap.LoadFromFile('Brush.bmp');
    Image1.Canvas.Brush.Bitmap:=Bitmap;
    Flag:=false;
end;

procedure TfrmMain.FormDestroy(Sender: TObject);
begin
    Bitmap.Free;
end;

procedure TfrmMain.Image1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
    Flag:=true;
    PointX:=X;
    PointY:=Y;
end;

procedure TfrmMain.Image1MouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
    if Flag then
        Image1.Canvas.Rectangle(PointX,PointY,X,Y);
    Flag:=false;
end;

end.