/**************************************************************************** ** ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the QtCore module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** This file contains pre-release code and may not be distributed. ** You may use this file in accordance with the terms and conditions ** contained in the Technology Preview License Agreement accompanying ** this package. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain additional ** rights. These rights are described in the Nokia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** ** ** ** ** ** ** ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include "qsize.h" #include "qdatastream.h" #include "qdebug.h" QT_BEGIN_NAMESPACE /*! \class QSize \ingroup painting \brief The QSize class defines the size of a two-dimensional object using integer point precision. A size is specified by a width() and a height(). It can be set in the constructor and changed using the setWidth(), setHeight(), or scale() functions, or using arithmetic operators. A size can also be manipulated directly by retrieving references to the width and height using the rwidth() and rheight() functions. Finally, the width and height can be swapped using the transpose() function. The isValid() function determines if a size is valid (a valid size has both width and height greater than zero). The isEmpty() function returns true if either of the width and height is less than, or equal to, zero, while the isNull() function returns true only if both the width and the height is zero. Use the expandedTo() function to retrieve a size which holds the maximum height and width of \e this size and a given size. Similarly, the boundedTo() function returns a size which holds the minimum height and width of \e this size and a given size. QSize objects can be streamed as well as compared. \sa QSizeF, QPoint, QRect */ /***************************************************************************** QSize member functions *****************************************************************************/ /*! \fn QSize::QSize() Constructs a size with an invalid width and height (i.e., isValid() returns false). \sa isValid() */ /*! \fn QSize::QSize(int width, int height) Constructs a size with the given \a width and \a height. \sa setWidth(), setHeight() */ /*! \fn bool QSize::isNull() const Returns true if both the width and height is 0; otherwise returns false. \sa isValid(), isEmpty() */ /*! \fn bool QSize::isEmpty() const Returns true if either of the width and height is less than or equal to 0; otherwise returns false. \sa isNull(), isValid() */ /*! \fn bool QSize::isValid() const Returns true if both the width and height is equal to or greater than 0; otherwise returns false. \sa isNull(), isEmpty() */ /*! \fn int QSize::width() const Returns the width. \sa height(), setWidth() */ /*! \fn int QSize::height() const Returns the height. \sa width(), setHeight() */ /*! \fn void QSize::setWidth(int width) Sets the width to the given \a width. \sa rwidth(), width(), setHeight() */ /*! \fn void QSize::setHeight(int height) Sets the height to the given \a height. \sa rheight(), height(), setWidth() */ /*! Swaps the width and height values. \sa setWidth(), setHeight() */ void QSize::transpose() { int tmp = wd; wd = ht; ht = tmp; } /*! \fn void QSize::scale(int width, int height, Qt::AspectRatioMode mode) Scales the size to a rectangle with the given \a width and \a height, according to the specified \a mode: \list \i If \a mode is Qt::IgnoreAspectRatio, the size is set to (\a width, \a height). \i If \a mode is Qt::KeepAspectRatio, the current size is scaled to a rectangle as large as possible inside (\a width, \a height), preserving the aspect ratio. \i If \a mode is Qt::KeepAspectRatioByExpanding, the current size is scaled to a rectangle as small as possible outside (\a width, \a height), preserving the aspect ratio. \endlist Example: \snippet doc/src/snippets/code/src_corelib_tools_qsize.cpp 0 \sa setWidth(), setHeight() */ /*! \fn void QSize::scale(const QSize &size, Qt::AspectRatioMode mode) \overload Scales the size to a rectangle with the given \a size, according to the specified \a mode. */ void QSize::scale(const QSize &s, Qt::AspectRatioMode mode) { if (mode == Qt::IgnoreAspectRatio || wd == 0 || ht == 0) { wd = s.wd; ht = s.ht; } else { bool useHeight; qint64 rw = qint64(s.ht) * qint64(wd) / qint64(ht); if (mode == Qt::KeepAspectRatio) { useHeight = (rw <= s.wd); } else { // mode == Qt::KeepAspectRatioByExpanding useHeight = (rw >= s.wd); } if (useHeight) { wd = rw; ht = s.ht; } else { ht = qint32(qint64(s.wd) * qint64(ht) / qint64(wd)); wd = s.wd; } } } /*! \fn int &QSize::rwidth() Returns a reference to the width. Using a reference makes it possible to manipulate the width directly. For example: \snippet doc/src/snippets/code/src_corelib_tools_qsize.cpp 1 \sa rheight(), setWidth() */ /*! \fn int &QSize::rheight() Returns a reference to the height. Using a reference makes it possible to manipulate the height directly. For example: \snippet doc/src/snippets/code/src_corelib_tools_qsize.cpp 2 \sa rwidth(), setHeight() */ /*! \fn QSize &QSize::operator+=(const QSize &size) Adds the given \a size to \e this size, and returns a reference to this size. For example: \snippet doc/src/snippets/code/src_corelib_tools_qsize.cpp 3 */ /*! \fn QSize &QSize::operator-=(const QSize &size) Subtracts the given \a size from \e this size, and returns a reference to this size. For example: \snippet doc/src/snippets/code/src_corelib_tools_qsize.cpp 4 */ /*! \fn QSize &QSize::operator*=(qreal factor) \overload Multiplies both the width and height by the given \a factor, and returns a reference to the size. Note that the result is rounded to the nearest integer. \sa scale() */ /*! \fn bool operator==(const QSize &s1, const QSize &s2) \relates QSize Returns true if \a s1 and \a s2 are equal; otherwise returns false. */ /*! \fn bool operator!=(const QSize &s1, const QSize &s2) \relates QSize Returns true if \a s1 and \a s2 are different; otherwise returns false. */ /*! \fn const QSize operator+(const QSize &s1, const QSize &s2) \relates QSize Returns the sum of \a s1 and \a s2; each component is added separately. */ /*! \fn const QSize operator-(const QSize &s1, const QSize &s2) \relates QSize Returns \a s2 subtracted from \a s1; each component is subtracted separately. */ /*! \fn const QSize operator*(const QSize &size, qreal factor) \relates QSize Multiplies the given \a size by the given \a factor, and returns the result rounded to the nearest integer. \sa QSize::scale() */ /*! \fn const QSize operator*(qreal factor, const QSize &size) \overload \relates QSize Multiplies the given \a size by the given \a factor, and returns the result rounded to the nearest integer. */ /*! \fn QSize &QSize::operator/=(qreal divisor) \overload Divides both the width and height by the given \a divisor, and returns a reference to the size. Note that the result is rounded to the nearest integer. \sa QSize::scale() */ /*! \fn const QSize operator/(const QSize &size, qreal divisor) \relates QSize \overload Divides the given \a size by the given \a divisor, and returns the result rounded to the nearest integer. \sa QSize::scale() */ /*! \fn QSize QSize::expandedTo(const QSize & otherSize) const Returns a size holding the maximum width and height of this size and the given \a otherSize. \sa boundedTo(), scale() */ /*! \fn QSize QSize::boundedTo(const QSize & otherSize) const Returns a size holding the minimum width and height of this size and the given \a otherSize. \sa expandedTo(), scale() */ /***************************************************************************** QSize stream functions *****************************************************************************/ #ifndef QT_NO_DATASTREAM /*! \fn QDataStream &operator<<(QDataStream &stream, const QSize &size) \relates QSize Writes the given \a size to the given \a stream, and returns a reference to the stream. \sa {Serializing Qt Data Types} */ QDataStream &operator<<(QDataStream &s, const QSize &sz) { if (s.version() == 1) s << (qint16)sz.width() << (qint16)sz.height(); else s << (qint32)sz.width() << (qint32)sz.height(); return s; } /*! \fn QDataStream &operator>>(QDataStream &stream, QSize &size) \relates QSize Reads a size from the given \a stream into the given \a size, and returns a reference to the stream. \sa {Serializing Qt Data Types} */ QDataStream &operator>>(QDataStream &s, QSize &sz) { if (s.version() == 1) { qint16 w, h; s >> w; sz.rwidth() = w; s >> h; sz.rheight() = h; } else { qint32 w, h; s >> w; sz.rwidth() = w; s >> h; sz.rheight() = h; } return s; } #endif // QT_NO_DATASTREAM #ifndef QT_NO_DEBUG_STREAM QDebug operator<<(QDebug dbg, const QSize &s) { dbg.nospace() << "QSize(" << s.width() << ", " << s.height() << ')'; return dbg.space(); } #endif /*! \class QSizeF \brief The QSizeF class defines the size of a two-dimensional object using floating point precision. \ingroup painting A size is specified by a width() and a height(). It can be set in the constructor and changed using the setWidth(), setHeight(), or scale() functions, or using arithmetic operators. A size can also be manipulated directly by retrieving references to the width and height using the rwidth() and rheight() functions. Finally, the width and height can be swapped using the transpose() function. The isValid() function determines if a size is valid. A valid size has both width and height greater than or equal to zero. The isEmpty() function returns true if either of the width and height is \e less than (or equal to) zero, while the isNull() function returns true only if both the width and the height is zero. Use the expandedTo() function to retrieve a size which holds the maximum height and width of this size and a given size. Similarly, the boundedTo() function returns a size which holds the minimum height and width of this size and a given size. The QSizeF class also provides the toSize() function returning a QSize copy of this size, constructed by rounding the width and height to the nearest integers. QSizeF objects can be streamed as well as compared. \sa QSize, QPointF, QRectF */ /***************************************************************************** QSizeF member functions *****************************************************************************/ /*! \fn QSizeF::QSizeF() Constructs an invalid size. \sa isValid() */ /*! \fn QSizeF::QSizeF(const QSize &size) Constructs a size with floating point accuracy from the given \a size. \sa toSize() */ /*! \fn QSizeF::QSizeF(qreal width, qreal height) Constructs a size with the given \a width and \a height. */ /*! \fn bool QSizeF::isNull() const Returns true if both the width and height is 0; otherwise returns false. \sa isValid(), isEmpty() */ /*! \fn bool QSizeF::isEmpty() const Returns true if either of the width and height is less than or equal to 0; otherwise returns false. \sa isNull(), isValid() */ /*! \fn bool QSizeF::isValid() const Returns true if both the width and height is equal to or greater than 0; otherwise returns false. \sa isNull(), isEmpty() */ /*! \fn int QSizeF::width() const Returns the width. \sa height(), setWidth() */ /*! \fn int QSizeF::height() const Returns the height. \sa width(), setHeight() */ /*! \fn void QSizeF::setWidth(qreal width) Sets the width to the given \a width. \sa width(), rwidth(), setHeight() */ /*! \fn void QSizeF::setHeight(qreal height) Sets the height to the given \a height. \sa height(), rheight(), setWidth() */ /*! \fn QSize QSizeF::toSize() const Returns an integer based copy of this size. Note that the coordinates in the returned size will be rounded to the nearest integer. \sa QSizeF() */ /*! Swaps the width and height values. \sa setWidth(), setHeight() */ void QSizeF::transpose() { qreal tmp = wd; wd = ht; ht = tmp; } /*! \fn void QSizeF::scale(qreal width, qreal height, Qt::AspectRatioMode mode) Scales the size to a rectangle with the given \a width and \a height, according to the specified \a mode. \list \i If \a mode is Qt::IgnoreAspectRatio, the size is set to (\a width, \a height). \i If \a mode is Qt::KeepAspectRatio, the current size is scaled to a rectangle as large as possible inside (\a width, \a height), preserving the aspect ratio. \i If \a mode is Qt::KeepAspectRatioByExpanding, the current size is scaled to a rectangle as small as possible outside (\a width, \a height), preserving the aspect ratio. \endlist Example: \snippet doc/src/snippets/code/src_corelib_tools_qsize.cpp 5 \sa setWidth(), setHeight() */ /*! \fn void QSizeF::scale(const QSizeF &size, Qt::AspectRatioMode mode) \overload Scales the size to a rectangle with the given \a size, according to the specified \a mode. */ void QSizeF::scale(const QSizeF &s, Qt::AspectRatioMode mode) { if (mode == Qt::IgnoreAspectRatio || qIsNull(wd) || qIsNull(ht)) { wd = s.wd; ht = s.ht; } else { bool useHeight; qreal rw = s.ht * wd / ht; if (mode == Qt::KeepAspectRatio) { useHeight = (rw <= s.wd); } else { // mode == Qt::KeepAspectRatioByExpanding useHeight = (rw >= s.wd); } if (useHeight) { wd = rw; ht = s.ht; } else { ht = s.wd * ht / wd; wd = s.wd; } } } /*! \fn int &QSizeF::rwidth() Returns a reference to the width. Using a reference makes it possible to manipulate the width directly. For example: \snippet doc/src/snippets/code/src_corelib_tools_qsize.cpp 6 \sa rheight(), setWidth() */ /*! \fn int &QSizeF::rheight() Returns a reference to the height. Using a reference makes it possible to manipulate the height directly. For example: \snippet doc/src/snippets/code/src_corelib_tools_qsize.cpp 7 \sa rwidth(), setHeight() */ /*! \fn QSizeF &QSizeF::operator+=(const QSizeF &size) Adds the given \a size to this size and returns a reference to this size. For example: \snippet doc/src/snippets/code/src_corelib_tools_qsize.cpp 8 */ /*! \fn QSizeF &QSizeF::operator-=(const QSizeF &size) Subtracts the given \a size from this size and returns a reference to this size. For example: \snippet doc/src/snippets/code/src_corelib_tools_qsize.cpp 9 */ /*! \fn QSizeF &QSizeF::operator*=(qreal factor) \overload Multiplies both the width and height by the given \a factor and returns a reference to the size. \sa scale() */ /*! \fn bool operator==(const QSizeF &s1, const QSizeF &s2) \relates QSizeF Returns true if \a s1 and \a s2 are equal; otherwise returns false. */ /*! \fn bool operator!=(const QSizeF &s1, const QSizeF &s2) \relates QSizeF Returns true if \a s1 and \a s2 are different; otherwise returns false. */ /*! \fn const QSizeF operator+(const QSizeF &s1, const QSizeF &s2) \relates QSizeF Returns the sum of \a s1 and \a s2; each component is added separately. */ /*! \fn const QSizeF operator-(const QSizeF &s1, const QSizeF &s2) \relates QSizeF Returns \a s2 subtracted from \a s1; each component is subtracted separately. */ /*! \fn const QSizeF operator*(const QSizeF &size, qreal factor) \overload \relates QSizeF Multiplies the given \a size by the given \a factor and returns the result. \sa QSizeF::scale() */ /*! \fn const QSizeF operator*(qreal factor, const QSizeF &size) \overload \relates QSizeF Multiplies the given \a size by the given \a factor and returns the result. */ /*! \fn QSizeF &QSizeF::operator/=(qreal divisor) \overload Divides both the width and height by the given \a divisor and returns a reference to the size. \sa scale() */ /*! \fn const QSizeF operator/(const QSizeF &size, qreal divisor) \relates QSizeF \overload Divides the given \a size by the given \a divisor and returns the result. \sa QSizeF::scale() */ /*! \fn QSizeF QSizeF::expandedTo(const QSizeF & otherSize) const Returns a size holding the maximum width and height of this size and the given \a otherSize. \sa boundedTo(), scale() */ /*! \fn QSizeF QSizeF::boundedTo(const QSizeF & otherSize) const Returns a size holding the minimum width and height of this size and the given \a otherSize. \sa expandedTo(), scale() */ /***************************************************************************** QSizeF stream functions *****************************************************************************/ #ifndef QT_NO_DATASTREAM /*! \fn QDataStream &operator<<(QDataStream &stream, const QSizeF &size) \relates QSizeF Writes the given \a size to the given \a stream and returns a reference to the stream. \sa {Serializing Qt Data Types} */ QDataStream &operator<<(QDataStream &s, const QSizeF &sz) { s << double(sz.width()) << double(sz.height()); return s; } /*! \fn QDataStream &operator>>(QDataStream &stream, QSizeF &size) \relates QSizeF Reads a size from the given \a stream into the given \a size and returns a reference to the stream. \sa {Serializing Qt Data Types} */ QDataStream &operator>>(QDataStream &s, QSizeF &sz) { double w, h; s >> w; s >> h; sz.setWidth(qreal(w)); sz.setHeight(qreal(h)); return s; } #endif // QT_NO_DATASTREAM #ifndef QT_NO_DEBUG_STREAM QDebug operator<<(QDebug dbg, const QSizeF &s) { dbg.nospace() << "QSizeF(" << s.width() << ", " << s.height() << ')'; return dbg.space(); } #endif QT_END_NAMESPACE