Title: How to draw something directly to the Desktop
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
// Finally free the Canvas Object.
Canv.Free;
end;
// Drawing a border
// Einen Rahmen zeichnen
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;
// Write some Text
// Text ausgeben
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;
// Draw a bitmap
// Ein Bild Zeichnen
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;
// To Clear the screen: InvalidateRect(0,nil,true);