/*--------------------------------------------------
    ALTWIND.C -- Alternate and Winding Fill Modes
  --------------------------------------------------*/
  
#include <windows.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int
 
 iCmdShow)
{
    static TCHAR    szAppName[] = TEXT("AltWind");
    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 Window NT!"),
                    szAppName, MB_ICONERROR);
        return 0;
    }
    
    hwnd = CreateWindow(szAppName,TEXT("Alternate and Winding Fill Modes"),
                        WS_OVERLAPPEDWINDOW,
                        CW_USEDEFAULT,CW_USEDEFAULT,
                        CW_USEDEFAULT,CW_USEDEFAULT,
                        NULL,NULL,hInstance,NULL);
    
    ShowWindow(hwnd,iCmdShow);
    UpdateWindow(hwnd);
    
    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam; 
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    static POINT     aptFigure[10] = {10,70, 50,70, 50,10, 90,10, 90,50,
                                      30,50, 30,90, 70,90, 70,30, 10,30};
    static int        cxClient, cyClient;
    HDC               hdc;
    int               i;
    PAINTSTRUCT       ps;
    POINT             apt[10];
    
    switch(message)
    {
        case WM_SIZE:
            cxClient = LOWORD(lParam);
            cyClient = HIWORD(lParam);
            return 0;
            
        case WM_PAINT:
            hdc = BeginPaint(hwnd,&ps);
            
            SelectObject(hdc,GetStockObject(GRAY_BRUSH));
            
            for(i=0;i<10;i++)
            {
                apt[i].x=cxClient*aptFigure[i].x/200;
                apt[i].y=cyClient*aptFigure[i].y/100;
            }
            
            SetPolyFillMode(hdc,ALTERNATE);
            Polygon(hdc,apt,10);
            
            for(i=0;i<10;i++)
            {
                apt[i].x += cxClient/2;
            }
            
            SetPolyFillMode(hdc,WINDING);
            Polygon(hdc,apt,10);
                      
            EndPaint(hwnd,&ps);
            return 0;
            
        case WM_DESTROY:
            PostQuitMessage(0);
            return 0;
    }
    return DefWindowProc(hwnd,message,wParam,lParam);
}