Drawing On Screen

Hi Experts!

How To Hide Our Application's Form And Then Draw a (Example: Line,Arc,...) On The Current Screen?
Can I Use CANVAS?

I'm Using Delphi 5.0

Bye
Programmer-x
LVL 15
Hamidreza VakilianSenior iOS/Android DeveloperAsked:
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cqhallCommented:
Try something along these lines...

Procedure EllipseOnDeskTop(X1, Y1, X2, Y2: integer; msDelay: word=3000; color: integer=clRed; fill: boolean=false);
var C : TCanvas;
  W : integer;
  diff: integer;
begin
 C:=TCanvas.Create;
 C.Handle:=GetDC(0);
 if fill then C.Brush.Color:=color else C.Brush.Style:=bsClear;
 C.Pen.color:=Color;
 C.Pen.Width:=2;
 C.Ellipse(X1, Y1, X2, Y2);
 W:=GetTickCount+msDelay;
 diff:=W-integer(GetTickCount);
 while diff>0 do
 begin
 if diff<>round(W - integer(GetTickCount)) then
 begin
  diff:=integer(W - integer(GetTickCount));
 end;
 end;
 ReleaseDC(0,C.Handle);
 C.Free;
 SystemParametersInfo(SPI_SETDESKWALLPAPER,0,nil,SPIF_SENDCHANGE);
end;
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