The QSizeF class defines the size of a two-dimensional object using floating point precision. More...
| Header: | #include <QSizeF> |
| qmake: | QT += core |
| QSizeF() | |
| QSizeF(const QSize &size) | |
| QSizeF(qreal width, qreal height) | |
| QSizeF | boundedTo(const QSizeF &otherSize) const |
| QSizeF | expandedTo(const QSizeF &otherSize) const |
| qreal | height() const |
| bool | isEmpty() const |
| bool | isNull() const |
| bool | isValid() const |
| qreal & | rheight() |
| qreal & | rwidth() |
| void | scale(qreal width, qreal height, Qt::AspectRatioMode mode) |
| void | scale(const QSizeF &size, Qt::AspectRatioMode mode) |
| QSizeF | scaled(qreal width, qreal height, Qt::AspectRatioMode mode) const |
| QSizeF | scaled(const QSizeF &s, Qt::AspectRatioMode mode) const |
| void | setHeight(qreal height) |
| void | setWidth(qreal width) |
| CGSize | toCGSize() const |
| QSize | toSize() const |
| void | transpose() |
| QSizeF | transposed() const |
| qreal | width() const |
| QSizeF & | operator*=(qreal factor) |
| QSizeF & | operator+=(const QSizeF &size) |
| QSizeF & | operator-=(const QSizeF &size) |
| QSizeF & | operator/=(qreal divisor) |
| QSizeF | fromCGSize(CGSize size) |
| bool | operator!=(const QSizeF &s1, const QSizeF &s2) |
| const QSizeF | operator*(const QSizeF &size, qreal factor) |
| const QSizeF | operator*(qreal factor, const QSizeF &size) |
| const QSizeF | operator+(const QSizeF &s1, const QSizeF &s2) |
| const QSizeF | operator-(const QSizeF &s1, const QSizeF &s2) |
| const QSizeF | operator/(const QSizeF &size, qreal divisor) |
| QDataStream & | operator<<(QDataStream &stream, const QSizeF &size) |
| bool | operator==(const QSizeF &s1, const QSizeF &s2) |
| QDataStream & | operator>>(QDataStream &stream, QSizeF &size) |
The QSizeF class defines the size of a two-dimensional object using floating 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 or equal to 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 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.
See also QSize, QPointF, and QRectF.
Constructs an invalid size.
See also isValid().
Constructs a size with floating point accuracy from the given size.
See also toSize().
Constructs a size with the given width and height.
Returns a size holding the minimum width and height of this size and the given otherSize.
See also expandedTo() and scale().
Returns a size holding the maximum width and height of this size and the given otherSize.
See also boundedTo() and scale().
[static] QSizeF QSizeF::fromCGSize(CGSize size)Creates a QRectF from size.
This function was introduced in Qt 5.8.
See also toCGSize().
Returns the height.
See also width() and setHeight().
Returns true if either of the width and height is less than or equal to 0; otherwise returns false.
See also isNull() and isValid().
Returns true if both the width and height are 0.0 (ignoring the sign); otherwise returns false.
See also isValid() and isEmpty().
Returns true if both the width and height is equal to or greater than 0; otherwise returns false.
See also isNull() and isEmpty().
Returns a reference to the height.
Using a reference makes it possible to manipulate the height directly. For example:
QSizeF size(100, 10.2); size.rheight() += 5.5; // size becomes (100,15.7)
See also rwidth() and setHeight().
Returns a reference to the width.
Using a reference makes it possible to manipulate the width directly. For example:
QSizeF size(100.3, 10); size.rwidth() += 20.5; // size becomes (120.8,10)
See also rheight() and setWidth().
Scales the size to a rectangle with the given width and height, according to the specified mode.
Example:
QSizeF t1(10, 12); t1.scale(60, 60, Qt::IgnoreAspectRatio); // t1 is (60, 60) QSizeF t2(10, 12); t2.scale(60, 60, Qt::KeepAspectRatio); // t2 is (50, 60) QSizeF t3(10, 12); t3.scale(60, 60, Qt::KeepAspectRatioByExpanding); // t3 is (60, 72)
See also setWidth(), setHeight(), and scaled().
This is an overloaded function.
Scales the size to a rectangle with the given size, according to the specified mode.
Returns a size scaled to a rectangle with the given width and height, according to the specified mode.
This function was introduced in Qt 5.0.
See also scale().
This is an overloaded function.
Returns a size scaled to a rectangle with the given size s, according to the specified mode.
This function was introduced in Qt 5.0.
Sets the height to the given height.
See also height(), rheight(), and setWidth().
Sets the width to the given width.
See also width(), rwidth(), and setHeight().
Creates a CGSize from a QSizeF.
This function was introduced in Qt 5.8.
See also fromCGSize().
Returns an integer based copy of this size.
Note that the coordinates in the returned size will be rounded to the nearest integer.
See also QSizeF().
Swaps the width and height values.
See also setWidth(), setHeight(), and transposed().
Returns the size with width and height values swapped.
This function was introduced in Qt 5.0.
See also transpose().
Returns the width.
See also height() and setWidth().
This is an overloaded function.
Multiplies both the width and height by the given factor and returns a reference to the size.
See also scale().
Adds the given size to this size and returns a reference to this size. For example:
QSizeF s( 3, 7); QSizeF r(-1, 4); s += r; // s becomes (2,11)
Subtracts the given size from this size and returns a reference to this size. For example:
QSizeF s( 3, 7); QSizeF r(-1, 4); s -= r; // s becomes (4,3)
This is an overloaded function.
Divides both the width and height by the given divisor and returns a reference to the size.
See also scale().
Returns true if s1 and s2 are different; otherwise returns false.
This is an overloaded function.
Multiplies the given size by the given factor and returns the result.
See also QSizeF::scale().
This is an overloaded function.
Multiplies the given size by the given factor and returns the result.
Returns the sum of s1 and s2; each component is added separately.
Returns s2 subtracted from s1; each component is subtracted separately.
This is an overloaded function.
Divides the given size by the given divisor and returns the result.
See also QSizeF::scale().
Writes the given size to the given stream and returns a reference to the stream.
See also Serializing Qt Data Types.
Returns true if s1 and s2 are equal; otherwise returns false.
Reads a size from the given stream into the given size and returns a reference to the stream.
See also Serializing Qt Data Types.
