How draw password on remote smartphone with mouse?

[flashcoder]

I'm working in a remote assistence software to android smartphones and i wish draw the password (similar to Team View for mobile) using the mouse and onmousemove event (or other event) of a Image component (that is where the remote screen is showed).

I'm using this Delphi code below but happens a detour on trajetory and draw a wrong password.
The image in attachment and video (following link) show how this is in pratice.

DEMOSTRATION IN VIDEO

Someone have some idea how solve this trouble?

Delphi-Quellcode:

TForm2 = class(TForm)
    procedure Image1MouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure Image1MouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
    procedure Image1MouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
  private
   PO,LP: TPoint;
   draw: boolean;
  public
    { Public declarations }
  end;

procedure TForm2.Image1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
 PO.X:= X;
 PO.Y:= Y;
 LP.X:= X;
 LP.Y:= Y;
 draw:= true;
// Canvas.Pen.Mode:= pmNotXor;
end;

procedure TForm2.Image1MouseMove(Sender: TObject; Shift: TShiftState; X,
  Y: Integer);
begin
 
 if draw then
 
  begin
  
   if (LP.X <> PO.X) or (LP.Y <> PO.Y) then
    begin

    { Canvas.MoveTo(PO.X,PO.Y);
     Canvas.LineTo(LP.X,LP.Y); }
    end;
   
   LP.X:= X;
   LP.Y:= Y;

   { Canvas.MoveTo(PO.X,PO.Y);
   Canvas.LineTo(LP.X,LP.Y); }
  end;
end;

procedure TForm2.Image1MouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin

// Sending throught Socket: PO.X, PO.Y, LP.X, LP.Y 

 if draw then draw:= false;
end;

SocketBackgroungService class:

Code:

if (xline.contains("swipescreen")) {

    String coordenates = xline.replace("swipescreen", "");

    String[] tokens = coordenates.split(Pattern.quote("<|>"));

    float x1 = parseFloat(tokens[0]);
    float y1 = parseFloat(tokens[1]);
    float x2 = parseFloat(tokens[2]);
    float y2 = parseFloat(tokens[3]);

    MyAccessibility.instance.Swipte((int) x1, (int) y1, (int) x2, (int) y2, 50);

}

MyAccessibility class (Swipte() routine):

Code:

public void Swipte(int x1,int y1,int x2,int y2,int time){
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
            System.out.println(" ======= Swipte =======");

            GestureDescription.Builder gestureBuilder = new GestureDescription.Builder();
            Path path = new Path();
            path.moveTo(x1,y1);
            path.lineTo(x2,y2);

            gestureBuilder.addStroke(new GestureDescription.StrokeDescription(path, 0, time));
            dispatchGesture(gestureBuilder.build(), new GestureResultCallback() {
                @Override
                public void onCompleted(GestureDescription gestureDescription) {
                    System.out.println("SWIPTE Gesture Completed :D");
                    super.onCompleted(gestureDescription);
                }
            }, null);
        }

    }