Отрисовка изображения поверх канвы (изображения) и вращение изображения

#ifndef Unit1H
#define Unit1H
// ---------------------------------------------------------------------------
#include <Classes.hpp>
#include <Controls.hpp>
#include <StdCtrls.hpp>
#include <Forms.hpp>
#include <memory>
// ---------------------------------------------------------------------------
class TForm1
               : public TForm {
__published: // IDE-managed Components
private:     // User declarations
public:      // User declarations
 
    std::auto_ptr<TTimer> engine_tmr;
    std::auto_ptr <Graphics::TBitmap> map_bmp, plane_bmp, result_bmp;
 
    void __fastcall engine_ontimer( TObject *_sender );
    void __fastcall RotateDC(HANDLE dc,float angle);
    __fastcall TForm1( TComponent *Owner );
};
// ---------------------------------------------------------------------------
extern PACKAGE TForm1 *Form1;
// ---------------------------------------------------------------------------
#endif

#include <vcl.h>
#include <math.h>
#pragma hdrstop
 
#include "Unit1.h"
// ---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
// ---------------------------------------------------------------------------
__fastcall TForm1::TForm1( TComponent *Owner )
               : TForm( Owner ) {
    engine_tmr = std::auto_ptr <TTimer> ( new TTimer( this ) );
    map_bmp = std::auto_ptr <Graphics::TBitmap> ( new Graphics::TBitmap( ) );
    plane_bmp = std::auto_ptr <Graphics::TBitmap> ( new Graphics::TBitmap( ) );
    result_bmp = std::auto_ptr <Graphics::TBitmap> ( new Graphics::TBitmap( ) );
 
    engine_tmr->Interval = 40;
    engine_tmr->OnTimer = & engine_ontimer;
    map_bmp->LoadFromFile( "map.bmp" );
    result_bmp->SetSize( map_bmp->Width, map_bmp->Height );
    plane_bmp->LoadFromFile( "su-27.bmp" );
    plane_bmp->Transparent = true;
    plane_bmp->TransparentColor = clWhite;
    ClientWidth = map_bmp->Width;
    ClientHeight = map_bmp->Height;
    DoubleBuffered = true;
 
    engine_tmr->Enabled = true;
}
// ---------------------------------------------------------------------------
void __fastcall TForm1::engine_ontimer( TObject *_sender ) {
    result_bmp->Canvas->Draw( 0, 0, map_bmp.get( ) );
 
    static float angle = 0, angle_delta = 2;
    static int y, x, r = map_bmp->Height / 2 - map_bmp->Height / 6;
 
    x = r * cos( ( angle - 90 ) * 3.1416 / 180.0 ) + map_bmp->Width / 2;
    y = r * sin( ( angle - 90 ) * 3.1416 / 180.0 ) + map_bmp->Height / 2;
 
    result_bmp->Canvas->TextOut( 0, 0, "angle: " + FloatToStr( angle ) +
        " x: " + FloatToStr( x ) + " y: " + FloatToStr( y ) );
 
    RotateDC( result_bmp->Canvas->Handle, angle );
    SetViewportOrgEx( result_bmp->Canvas->Handle, x, y, NULL );
    result_bmp->Canvas->Draw( -plane_bmp->Width / 2, -plane_bmp->Height / 2, plane_bmp.get( ) );
    RotateDC( result_bmp->Canvas->Handle, 0 );
    SetViewportOrgEx( result_bmp->Canvas->Handle, 0, 0, NULL );
    angle >= 360 ? angle = angle_delta : angle += angle_delta;
 
    Canvas->Draw( 0, 0, result_bmp.get( ) );
}
// ---------------------------------------------------------------------------
void __fastcall TForm1::RotateDC( HANDLE dc, float angle ) {
    XFORM xform;
 
    angle = angle * 3.1416 / 180.0;
    xform.eDx = 0.0f;
    xform.eDy = 0.0f;
    xform.eM11 = cos( angle );
    xform.eM12 = sin( angle );
    xform.eM21 = -sin( angle );
    xform.eM22 = cos( angle );
 
    SetGraphicsMode( ( HDC__ * )dc, GM_ADVANCED );
    SetWorldTransform( ( HDC__ * )dc, &xform );
}

 XFORM f;
     SetGraphicsMode(z, GM_ADVANCED);
 
      f.eM11 = (FLOAT) 0.8660;
      f.eM12 = (FLOAT) 0.5000;
      f.eM21 = (FLOAT) -0.5000;
      f.eM22 = (FLOAT) 0.8660;
      f.eDx  = (FLOAT) 0.0;
      f.eDy  = (FLOAT) 0.0;
      SetWorldTransform(z, &f);  
 
  BitBlt(context, 0, 0,700,500, fon, 0, 0, SRCCOPY);
  BitBlt(context, mks->x,mks->y,40,30, z, 0, 0, SRCCOPY);

    RotateDC( result_bmp->Canvas->Handle, angle );
    SetViewportOrgEx( result_bmp->Canvas->Handle, x, y, NULL );
    result_bmp->Canvas->Draw( -plane_bmp->Width / 2, -plane_bmp->Height / 2, plane_bmp.get( ) );
    RotateDC( result_bmp->Canvas->Handle, 0 );
    SetViewportOrgEx( result_bmp->Canvas->Handle, 0, 0, NULL );