图形基础 - windows编程基础

roc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static POINT apt[4] ;
HDC hdc ;
int cxClient, cyClient ;
PAINTSTRUCT ps ;

switch (message)
{
case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;

apt[0].x = cxClient / 4 ;
apt[0].y = cyClient / 2 ;

apt[1].x = cxClient / 2 ;
apt[1].y = cyClient / 4 ;

apt[2].x = cxClient / 2 ;
apt[2].y = 3 * cyClient / 4 ;

apt[3].x = 3 * cxClient / 4 ;
apt[3].y = cyClient / 2 ;

return 0 ;

case WM_LBUTTONDOWN:
case WM_RBUTTONDOWN:
case WM_MOUSEMOVE:
if (wParam & MK_LBUTTON || wParam & MK_RBUTTON)

{
hdc = GetDC (hwnd) ;
SelectObject (hdc, GetStockObject (WHITE_PEN)) ;
DrawBezier (hdc, apt) ;

if (wParam & MK_LBUTTON)
{
apt[1].x = LOWORD (lParam) ;
apt[1].y = HIWORD (lParam) ;
}

if (wParam & MK_RBUTTON)
{
apt[2].x = LOWORD (lParam) ;
apt[2].y = HIWORD (lParam) ;
}

SelectObject (hdc, GetStockObject (BLACK_PEN)) ;
DrawBezier (hdc, apt) ;
ReleaseDC (hwnd, hdc) ;
}
return 0 ;
case WM_PAINT:
InvalidateRect (hwnd, NULL, TRUE) ;

hdc = BeginPaint (hwnd, &ps) ;

DrawBezier (hdc, apt) ;

EndPaint (

图形基础(三十六)