qregion.cpp

奇趣公司比较新的qt/emd版本

                    break;
                case QRGN_SUB:
                    rgn = r1.subtracted(r2);
                    break;
                case QRGN_XOR:
                    rgn = r1.xored(r2);
                    break;
            }
        } else if (id == QRGN_RECTS) {
            // (This is the only form used in Qt 2.0)
            quint32 n;
            s >> n;
            QRect r;
            for (int i=0; i<(int)n; i++) {
                s >> r;
                rgn = rgn.united(QRegion(r));
            }
        }
    }
    *this = rgn;
}


/*****************************************************************************
  QRegion stream functions
 *****************************************************************************/

/*!
    \relates QRegion

    Writes the region \a r to the stream \a s and returns a reference
    to the stream.

    \sa \link datastreamformat.html Format of the QDataStream operators \endlink
*/

QDataStream &operator<<(QDataStream &s, const QRegion &r)
{
    QVector<QRect> a = r.rects();
    if (a.isEmpty()) {
        s << (quint32)0;
    } else {
        if (s.version() == 1) {
            int i;
            for (i = a.size() - 1; i > 0; --i) {
                s << (quint32)(12 + i * 24);
                s << (int)QRGN_OR;
            }
            for (i = 0; i < a.size(); ++i) {
                s << (quint32)(4+8) << (int)QRGN_SETRECT << a[i];
            }
        } else {
            s << (quint32)(4 + 4 + 16 * a.size()); // 16: storage size of QRect
            s << (qint32)QRGN_RECTS;
            s << a;
        }
    }
    return s;
}

/*!
    \relates QRegion

    Reads a region from the stream \a s into \a r and returns a
    reference to the stream.

    \sa \link datastreamformat.html Format of the QDataStream operators \endlink
*/

QDataStream &operator>>(QDataStream &s, QRegion &r)
{
    QByteArray b;
    s >> b;
    r.exec(b, s.version());
    return s;
}
#endif //QT_NO_DATASTREAM

#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug s, const QRegion &r)
{
    QVector<QRect> rects = r.rects();
    s.nospace() << "QRegion(size=" << rects.size() << "), "
                << "bounds = " << r.boundingRect() << "\n";
    for (int i=0; i<rects.size(); ++i)
        s << "- " << i << rects.at(i) << "\n";
    return s;
}
#endif


// These are not inline - they can be implemented better on some platforms
//  (eg. Windows at least provides 3-variable operations).  For now, simple.


/*!
    Applies the united() function to this region and \a r. \c r1|r2 is
    equivalent to \c r1.united(r2).

    \sa united(), operator+()
*/
const QRegion QRegion::operator|(const QRegion &r) const
    { return united(r); }

/*!
    Applies the united() function to this region and \a r. \c r1+r2 is
    equivalent to \c r1.united(r2).

    \sa united(), operator|()
*/
const QRegion QRegion::operator+(const QRegion &r) const
    { return united(r); }

/*!
    Applies the intersected() function to this region and \a r. \c r1&r2
    is equivalent to \c r1.intersected(r2).

    \sa intersected()
*/
const QRegion QRegion::operator&(const QRegion &r) const
    { return intersected(r); }

/*!
    Applies the subtracted() function to this region and \a r. \c r1-r2
    is equivalent to \c r1.subtracted(r2).

    \sa subtracted()
*/
const QRegion QRegion::operator-(const QRegion &r) const
    { return subtracted(r); }

/*!
    Applies the xored() function to this region and \a r. \c r1^r2 is
    equivalent to \c r1.xored(r2).

    \sa xored()
*/
const QRegion QRegion::operator^(const QRegion &r) const
    { return xored(r); }

/*!
    Applies the united() function to this region and \a r and assigns
    the result to this region. \c r1|=r2 is equivalent to \c
    {r1 = r1.united(r2)}.

    \sa united()
*/
QRegion& QRegion::operator|=(const QRegion &r)
    { return *this = *this | r; }

/*!
    \fn QRegion& QRegion::operator+=(const QRegion &r)

    Applies the united() function to this region and \a r and assigns
    the result to this region. \c r1+=r2 is equivalent to \c
    {r1 = r1.united(r2)}.

    \sa intersected()
*/

/*!
  \fn QRegion& QRegion::operator&=(const QRegion &r)

  Applies the intersected() function to this region and \a r and
  assigns the result to this region. \c r1&=r2 is equivalent to \c
  r1 = r1.intersected(r2).
  
  \sa intersected()
*/
#ifndef Q_WS_WIN
QRegion& QRegion::operator&=(const QRegion &r)
    { return *this = *this & r; }
#endif

/*!
  \fn QRegion& QRegion::operator-=(const QRegion &r)
  
  Applies the subtracted() function to this region and \a r and
  assigns the result to this region. \c r1-=r2 is equivalent to \c
  {r1 = r1.subtracted(r2)}.
  
  \sa subtracted()
*/
#ifndef Q_WS_WIN
QRegion& QRegion::operator-=(const QRegion &r)
    { return *this = *this - r; }
#endif

/*!
    Applies the xored() function to this region and \a r and
    assigns the result to this region. \c r1^=r2 is equivalent to \c
    {r1 = r1.xored(r2)}.

    \sa xored()
*/
QRegion& QRegion::operator^=(const QRegion &r)
    { return *this = *this ^ r; }

/*!
    \fn bool QRegion::operator!=(const QRegion &other) const

    Returns true if this region is different from the \a other region;
    otherwise returns false.
*/

/*!
   Returns the region as a QVariant
*/
QRegion::operator QVariant() const
{
    return QVariant(QVariant::Region, this);
}

/*!
    \fn bool QRegion::isNull() const

    Use isEmpty() instead.
*/


/*!
    \fn QRegion QRegion::translated(const QPoint &p) const
    \overload
    \since 4.1

    Returns a copy of the regtion that is translated \a{p}\e{.x()}
    along the x axis and \a{p}\e{.y()} along the y axis, relative to
    the current position.  Positive values move the rectangle to the
    right and down.

    \sa translate()
*/

/*!
    \since 4.1

    Returns a copy of the region that is translated \a dx along the
    x axis and \a dy along the y axis, relative to the current
    position. Positive values move the region to the right and
    down.

    \sa translate()
*/

QRegion
QRegion::translated(int dx, int dy) const
{
    QRegion ret(*this);
    ret.translate(dx, dy);
    return ret;
}


inline bool rect_intersects(const QRect &r1, const QRect &r2)
{
    return qMax(r1.left(), r2.left()) <= qMin(r1.right(), r2.right())
        && qMax(r1.top(), r2.top()) <= qMin(r1.bottom(), r2.bottom());
}

/*!
    \since 4.2

    Returns true if this region intersects with \a region, otherwise
    returns false.
*/
bool QRegion::intersects(const QRegion &region) const
{
    const QVector<QRect> myRects = rects();
    const QVector<QRect> otherRects = region.rects();

    for (QVector<QRect>::const_iterator i1 = myRects.begin(); i1 < myRects.end(); ++i1)
        for (QVector<QRect>::const_iterator i2 = otherRects.begin(); i2 < otherRects.end(); ++i2)
            if (rect_intersects(*i1, *i2))
                return true;
    return false;
}

/*!
    \since 4.2

    Returns true if this region intersects with \a rect, otherwise
    returns false.
*/
bool QRegion::intersects(const QRect &rect) const
{
    QRect r = rect.normalized();
    const QVector<QRect> myRects = rects();
    for (QVector<QRect>::const_iterator it = myRects.begin(); it < myRects.end(); ++it)
        if (rect_intersects(r, *it))
            return true;
    return false;
}