MFC-IntersectRect获得两个矩形的交集部分

 

    HDC hdc = ::GetDC(m_hWnd);
    RECT rect = { 10,10,100,100 };
    RECT rect1 = {50,50,150,150};
    RECT rect2;
    HBRUSH hbr;
    hbr = CreateSolidBrush(RGB(0, 0, 255));
    SelectObject(hdc, hbr);

    int f = FrameRect(hdc, &rect, hbr);
    f = FrameRect(hdc, &rect1, hbr);

    BOOL b= IntersectRect(&rect2,&rect1,&rect); //指向两个源矩形相交的矩形
    /*
    参数1：LPCRECT lprcDst  指向两个源矩形相交的矩形
    参数2：LPCRECT lpRect1  源矩形
    参数3:LPCRECT lpRect2   源矩形
    返回值：如果交不为空，则返回非零值；否则，如果交为空则返回0
    */

    Sleep(2000);
    hbr = CreateSolidBrush(RGB(255, 0, 0));
    SelectObject(hdc, hbr);
    f = FrameRect(hdc, &rect2, hbr);

    DeleteObject(hbr);
    ::ReleaseDC(m_hWnd, hdc);