【转】Windows 中不规则窗体的编程实现

BOOL CDC::BeginPath( );

HRGN PathToRegion( HDC hdc );

            <span>void</span>
            <span> CTestDlg::OnTest()
{
    HRGN wndRgn;
    CClientDC dc(</span>
            <span>this</span>
            <span>);
    CFont mFont;
     
    </span>
            <span>if</span> (dc.m_hDC!=<span>NULL)
    {
        VERIFY(mFont.CreateFont(
            </span><span>200</span>, <span>50</span>, <span>0</span>, <span>0</span><span>, FW_HEAVY, TRUE, FALSE,
            </span><span>0</span><span>, ANSI_CHARSET, OUT_DEFAULT_PRECIS,       
            CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY,            
            DEFAULT_PITCH </span>| FF_SWISS, <span>"</span><span>宋体</span><span>"</span><span>));                 
     
        </span><span>//</span><span>开始记录窗体轮廓路径</span><span>        dc.BeginPath();    

        </span><span>//</span><span>设置背景为透明模式,这句话是必须有的。</span><span>        dc.SetBkMode(TRANSPARENT); 
         
        CFont </span>*<span> pOldFont;
        pOldFont </span>= dc.SelectObject( &<span>mFont );
        dc.TextOut(</span><span>0</span>, <span>0</span>, <span>"</span><span>Hello</span><span>"</span><span>);
     
        </span><span>//</span><span>结束记录窗体轮廓路径</span><span>        dc.SelectObject( pOldFont );
        dc.EndPath();
         
        </span><span>//</span><span>把所记录的路径转化为窗体轮廓句柄</span>
        wndRgn =<span> ::PathToRegion(dc.m_hDC);
 
        </span><span>//</span><span>赋予窗体指定的轮廓形状</span><span>this</span>-><span>SetWindowRgn(wndRgn, TRUE);       
    }
}</span>

            <span>void</span>
            <span> SetupRegion(
CDC </span>*pDC, <span>//</span><span>窗体的DC指针</span>
CBitmap &cBitmap, <span>//</span><span>含有窗体形状的位图对象</span>
COLORREF TransColor <span>//</span><span>透明色</span><span>)
{    CDC memDC;
    </span><span>//</span><span>创建与传入DC兼容的临时DC</span><span>    memDC.CreateCompatibleDC(pDC);
 
    CBitmap </span>*pOldMemBmp=<span>NULL;
    </span><span>//</span><span>将位图选入临时DC</span>
    pOldMemBmp=memDC.SelectObject(&<span>cBitmap);
    
    CRgn wndRgn;
    </span><span>//</span><span>创建总的窗体区域，初始region为0</span>
    wndRgn.CreateRectRgn(<span>0</span>,<span>0</span>,<span>0</span>,<span>0</span><span>);
  
    BITMAP bit;  
    cBitmap.GetBitmap (</span>&bit);<span>//</span><span>取得位图参数，这里要用到位图的长和宽    </span><span>int</span><span> y;
        </span><span>for</span>(y=<span>0</span>;y<=bit.bmHeight  ;y++<span>)
        {
        CRgn rgnTemp; </span><span>//</span><span>保存临时region</span><span>int</span> iX = <span>0</span><span>;
            </span><span>do</span><span>
            {
                </span><span>//</span><span>跳过透明色找到下一个非透明色的点.</span><span>while</span> (iX <= bit.bmWidth  && memDC.GetPixel(iX, y) ==<span> TransColor)
                    iX</span>++<span>;
 
                </span><span>//</span><span>记住这个起始点</span><span>int</span> iLeftX =<span> iX;
 
                </span><span>//</span><span>寻找下个透明色的点</span><span>while</span> (iX <= bit.bmWidth  && memDC.GetPixel(iX, y) !=<span> TransColor)
                    </span>++<span>iX;
 
                </span><span>//</span><span>创建一个包含起点与重点间高为1像素的临时“region”</span>
                rgnTemp.CreateRectRgn(iLeftX, y, iX, y+<span>1</span><span>);
 
                </span><span>//</span><span>合并到主"region".</span>
                wndRgn.CombineRgn(&wndRgn, &<span>rgnTemp, RGN_OR);
                 
        </span><span>//</span><span>删除临时"region",否则下次创建时和出错</span><span>                rgnTemp.DeleteObject();
            }</span><span>while</span><span>(iX GetWindow();
    pWnd</span>-><span>SetWindowRgn(wndRgn,TRUE);   
    pWnd</span>-><span>SetForegroundWindow();   
}</span>