Category: Graphic
Title: Draw directly to the Desktop
Date added: 15.03.2006
Hits: 3306

var
  Form1: TForm1;
  Canv: TCanvas;
implementation
{$R *.DFM}

procedure TForm1.FormCreate(Sender: TObject);
begin
  Canv := TCanvas.Create;
  Canv.Handle := GetWindowDC(0);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  Canv.Free;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  Canv.pen.Color := clred;
  Canv.pen.Width := 20;
  Canv.moveto(Screen.Width, 2);
  Canv.lineto(2, 2);
  Canv.lineto(2, Screen.Height);
  Canv.lineto(Screen.Width, Screen.Height);
  Canv.lineto(Screen.Width, 2);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  Canv.Font.Name   := 'Arial';
  Canv.Font.Size   := 55;
  Canv.Font.Color  := clgreen;
  Canv.Brush.Style := bsclear;
  Canv.textout(240, Screen.Height div 2 - 30, 'Hello to Screen !');
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  myBitmap: TBitmap;
begin
  myBitmap := TBitmap.Create;
  try
    myBitmap.LoadFromFile('MyImage.bmp');
    Canv.draw(100, 100, myBitmap);
  finally
    myBitmap.Free;
  end;
end;

1. How to get the pixel color in a canvas on the mouse position? (3336 Hits)

2. How to draw an icon on a Timage? (1610 Hits)

3. How to determine if two icons are equal? (1362 Hits)

4. How to get the current screen resolution? (2377 Hits)

5. How to empty a Timage? (1757 Hits)

For any problems or recommendations about Delphi Tricks site, please

feel free to contact us on that e-mail: support@delphitricks.com.
If you want to advertise on the site use that e-mail: advertise@delphitricks.com.

You can freely use or modify these Delphi source codes for non-commercial use. We are not responsible of any damages that can be caused by the utilisation of that source codes.