Visual C++/Windows SDK Program for the Generation of Random Rectangles | CS1255 - Visual Programming Laboratory

AIM:
To write a Visual C++/Windows SDK Program for the Generation of Random Rectangles in CS1255 - Visual Programming Lab.

SOURCE CODE:
#include<windows.h>
#include<math.h>
#define NUM 1000
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
void DrawRectangle(HWND);
int cxClient,cyClient;
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow)
{
 static TCHAR szAppName[]=TEXT("Random Rectangle");
 HWND hwnd;
 MSG msg;
 WNDCLASS wndclass;
 wndclass.style=CS_HREDRAW|CS_VREDRAW;
 wndclass.lpfnWndProc=WndProc;
 wndclass.cbClsExtra=0;
 wndclass.cbWndExtra=0;
 wndclass.hInstance=hInstance;
 wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
 wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
 wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
 wndclass.lpszMenuName=NULL;
 wndclass.lpszClassName=szAppName;
 if(!RegisterClass(&wndclass))
 {
  MessageBox(NULL,
TEXT("Program requires Windows NT"),szAppName,MB_ICONERROR);
  return 0;
 }
 hwnd=CreateWindow(szAppName,TEXT("JEBASTIN - Random Rectangles"),                    
                 WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,
           CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);
 ShowWindow(hwnd,iCmdShow);
 UpdateWindow(hwnd);
 while(true)
 {
  if(PeekMessage(&msg,NULL,0,0,PM_REMOVE))
  {
   if(msg.message==WM_QUIT)
     break;
   TranslateMessage(&msg);
   DispatchMessage(&msg);
  }
  else
   DrawRectangle(hwnd);
 }
 return msg.wParam;
}
   
LRESULT CALLBACK WndProc(HWND hwnd,UINT Msg,WPARAM wParam,LPARAM lParam)
{
 switch(Msg)
 {
  case WM_SIZE:
    cxClient=LOWORD(lParam);
    cyClient=HIWORD(lParam);
    return 0;
  case WM_DESTROY:
    PostQuitMessage(0);
    return 0;
 }
 return DefWindowProc(hwnd,Msg,wParam,lParam);
}

void DrawRectangle(HWND hwnd)
{
 HBRUSH hBrush;
 HDC hdc;
 RECT rect;
 if(cxClient==0||cyClient==0)
   return;
 SetRect(&rect,rand()%cxClient,rand()%cyClient,rand()%cxClient,rand()%cyClient);
 hBrush=CreateSolidBrush(RGB(rand()%256,rand()%256,rand()%256));
 hdc=GetDC(hwnd);
 FillRect(hdc,&rect,hBrush);
 ReleaseDC(hwnd,hdc);
 DeleteObject(hBrush);
}

OUTPUT:
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