//Листинг 4.7. Демонстрация вращения графического образа


#define _USE_MATH_DEFINES
#include <math.h>
TCHAR *text = _T("Масяня");
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM
	lParam)
{
	PAINTSTRUCT ps;
	HDC hdc;
   static int x, y, cx, cy;
   static double angle;
   static HDC memBit;
   static HBITMAP hBitmap;
   static BITMAP bm;
   static XFORM xf;
   switch (message)
   {
   case WM_CREATE:
      hBitmap = (HBITMAP)LoadImage(NULL, _T("mas1.bmp"), IMAGE_BITMAP, 0,

         0, LR_LOADFROMFILE | LR_CREATEDIBSECTION);
      GetObject(hBitmap, sizeof(bm), &bm);
      hdc = GetDC(hWnd);
      memBit = CreateCompatibleDC(hdc);
      SelectObject(memBit, hBitmap);
      ReleaseDC(hWnd, hdc);
      break;
   case WM_SIZE:
      cx = LOWORD(lParam)/2; //Координаты центра окна
      cy = HIWORD(lParam)/2;
      xf.eDx = cx;    //Точка будет являться и новым началом
      xf.eDy = cy;    //координат для графических функций
      x = - bm.bmWidth/2;
      y = - bm.bmHeight/2;
      break;
   case WM_LBUTTONDOWN: angle += M_PI*45.0/180.0;
      InvalidateRect(hWnd, NULL, TRUE);
      break;
   case WM_PAINT:
      xf.eM22 = xf.eM11 = cos(angle);
      xf.eM12 = -(xf.eM21 = sin(angle));
      hdc = BeginPaint (hWnd, &ps);
      SetGraphicsMode(hdc, GM_ADVANCED);
      SetWorldTransform(hdc, &xf);
      TextOut(hdc,x+35, y-20, text, _tcsclen(text));
      BitBlt(hdc, x, y, bm.bmWidth, bm.bmHeight, memBit, 0, 0, SRCCOPY);
      EndPaint(hWnd, &ps);
      break;
   case WM_COMMAND:
      switch (LOWORD(wParam))
      {
      case IDM_EXIT: DestroyWindow(hWnd); break;
      default: return DefWindowProc(hWnd, message, wParam, lParam);
      }
      break;
   case WM_DESTROY: PostQuitMessage(0); break;
   default: return DefWindowProc(hWnd, message, wParam, lParam);
   }
   return 0;
}