Marco's Web Center

Menu for Development

Site Menu
Object Pascal Handbook
Delphi Handbooks Collection
Mastering Borland Delphi 2005
(Old) White Papers
(Old)Tools
(Old) Conferences

My Other Sites
Italian Site (www.marcocantu.it)
the delphi search

Spirit of delphi

Advertising
Home My Blog Books Object Pascal Marco

Home: Code Repository: Mastering Delphi 6

Chapter 09 - Project Scroll2

Project Structure

Scroll2.dpr
program Scroll2;

uses
  Forms,
  ScrollF in 'ScrollF.pas' {Form2};

{$R *.RES}

begin
  Application.CreateForm(TForm2, Form2);
  Application.Run;
end.
ScrollF.pas
unit ScrollF;

interface

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

type
  TForm2 = class(TForm)
    procedure FormPaint(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

{$R *.DFM}

procedure TForm2.FormPaint(Sender: TObject);
begin
  SetWindowOrgEx (Canvas.Handle,
    HorzScrollbar.Position,
    VertScrollbar.Position, nil);

  {draw a yellow line}
  Canvas.Pen.Width := 30;
  Canvas.Pen.Color := clYellow;
  Canvas.MoveTo (30, 30);
  Canvas.LineTo (1970, 1970);

  {draw a blue line}
  Canvas.Pen.Color := clNavy;
  Canvas.MoveTo (30, 1970);
  Canvas.LineTo (1970, 30);

  {draw a fuchsia square}
  Canvas.Pen.Color := clFuchsia;
  Canvas.Brush.Style := bsClear;
  Canvas.Rectangle (500, 500,
    1500, 1500);
end;

end.
ScrollF.dfm
object Form2: TForm2
  Left = 156
  Top = 112
  Width = 496
  Height = 379
  HorzScrollBar.Range = 2000
  VertScrollBar.Range = 2000
  AutoScroll = False
  Caption = 'Scroll2'
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  OldCreateOrder = True
  OnPaint = FormPaint
  PixelsPerInch = 96
  TextHeight = 13
end