Delphi FMX erstellen einer Ellipse bei der Mouse Position

[e.oder]

Hallo lieb Delphi Community,
gleich am Anfang ich bin ein ziemlicher Anfänger was Delphi angeht.

Also ich versuche per MouseClick eine Ellipse an der Maus Position zu erstellen leider noch ohne Erfolg.

Delphi-Quellcode:

unit Unit2;

interface

uses
  System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,
  FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs,
  FMX.Controls.Presentation, FMX.StdCtrls, FMX.Objects;

type
  TForm2 = class(TForm)
    Image1: TImage;
    procedure Image1Click(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X,Y: Single);
    procedure FormCreate(Sender: TObject);
    procedure Image1MouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Single);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form2: TForm2;
  SaveState, InitialState: TCanvasSaveState;


implementation

{$R *.fmx}

procedure TForm2.FormCreate(Sender: TObject);
begin
  Image1.Bitmap := TBitmap.CreateFromFile('Kran.jpg');
  InitialState := Image1.Bitmap.Canvas.SaveState;
end;

procedure TForm2.Image1Click(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X,Y: Single);
var
  AShape: TShape;
  TColor: TAlphaColor;
  MyRect: TRectF;
  x1, y1, x2, y2: integer;
begin

end;

procedure TForm2.Image1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Single); //funktioniert
var
  AShape: TShape;
  TColor: TAlphaColor;
  MyRect: TRect;
  x1, y1, x2, y2: integer;
  p: TPointF;
  ACursor: TCursor;
begin
  begin
    p := Screen.MousePos;
    Parent := Form2;
    x1 := 80;
    y1 := 80;
    x2 := Image1.Bitmap.Canvas.Width -80;
    y2 := Image1.Bitmap.Canvas.Height -80;
    MyRect := TRect.Create(x1, y1, x2, y2);
    Image1.Bitmap.Canvas.Stroke.Color := TAlphaColorRec.Red;
    Image1.Bitmap.Canvas.Stroke.Thickness := 8.0;
    Image1.Bitmap.Canvas.BeginScene;
    Image1.Bitmap.Canvas.DrawEllipse(MyRect, 10);
    Image1.Bitmap.Canvas.EndScene;
  end;
end;

end.