图形基础 - windows编程基础

INT 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) ;
}

图形的座标（划分为100×100个单位）储存在aptFigure阵列中。这些座标是依据显示区域的宽度和高度划分的。程式显示图形两次，一次使用ALTERNATE填入方式，另一次使用WINDING方式。结果见图5-17。

图形基础(四十九)