2, 2 * cxClient / 3, cyClient) ; hRgnTemp[4] = CreateRectRgn (0, 0, 1, 1) ; hRgnTemp[5] = CreateRectRgn (0, 0, 1, 1) ; hRgnClip = CreateRectRgn (0, 0, 1, 1) ;
CombineRgn (hRgnTemp[4], hRgnTemp[0], hRgnTemp[1], RGN_OR) ; CombineRgn (hRgnTemp[5], hRgnTemp[2], hRgnTemp[3], RGN_OR) ; CombineRgn (hRgnClip, hRgnTemp[4], hRgnTemp[5], RGN_XOR) ; for (i = 0 ; i < 6 ; i++) DeleteObject (hRgnTemp[i]) ; SetCursor (hCursor) ; ShowCursor (FALSE) ; return 0 ; case WM_PAINT: hdc = BeginPaint (hwnd, &ps) ; SetViewportOrgEx (hdc, cxClient / 2, cyClient / 2, NULL) ; SelectClipRgn (hdc, hRgnClip) ; fRadius = _hypot (cxClient / 2.0, cyClient / 2.0) ; for (fAngle = 0.0 ; fAngle < TWO_PI ; fAngle += TWO_PI / 360) { MoveToEx (hdc, 0, 0, NULL) ; LineTo (hdc, (int) ( fRadius * cos (fAngle) + 0.5), (int) (-fRadius * sin (fAngle) + 0.5)) ; } EndPaint (hwnd, &ps) ; return 0 ; case WM_DESTROY: DeleteObject (hRgnClip) ; PostQuitMessage (0) ; return 0 ; } return DefWindowProc (hwnd, iMsg, wParam, lParam) ; }
由於剪裁区域总是 |