|CMake:|| find_package(Qt6 REQUIRED COMPONENTS Gui) |
target_link_libraries(mytarget PRIVATE Qt6::Gui)
|qmake:||QT += gui|
|QPicture(int formatVersion = -1)|
|QPicture(const QPicture &pic)|
|const char *||data() const|
|bool||load(const QString &fileName)|
|bool||save(const QString &fileName)|
|void||setBoundingRect(const QRect &r)|
|virtual void||setData(const char *data, uint size)|
|QPicture &||operator=(const QPicture &p)|
|QPicture &||operator=(QPicture &&other)|
|QDataStream &||operator<<(QDataStream &s, const QPicture &r)|
|QDataStream &||operator>>(QDataStream &s, QPicture &r)|
A picture serializes painter commands to an IO device in a platform-independent format. They are sometimes referred to as meta-files.
Qt pictures use a proprietary binary format. Unlike native picture (meta-file) formats on many window systems, Qt pictures have no limitations regarding their contents. Everything that can be painted on a widget or pixmap (e.g., fonts, pixmaps, regions, transformed graphics, etc.) can also be stored in a picture.
QPicture is resolution independent, i.e. a QPicture can be displayed on different devices (for example svg, pdf, ps, printer and screen) looking the same. This is, for instance, needed for WYSIWYG print preview. QPicture runs in the default system dpi, and scales the painter to match differences in resolution depending on the window system.
Example of how to record a picture:
Note that the list of painter commands is reset on each call to the QPainter::begin() function.
Example of how to replay a picture:
See also QMovie.
Member Function Documentation
Constructs an empty picture.
The formatVersion parameter may be used to create a QPicture that can be read by applications that are compiled with earlier versions of Qt.
Note that the default formatVersion is -1 which signifies the current release, i.e. for Qt 4.0 a formatVersion of 7 is the same as the default formatVersion of -1.
Reading pictures generated by earlier versions of Qt is not supported in Qt 4.0.
QPicture::QPicture(const QPicture &pic)
Constructs a copy of pic.
This constructor is fast thanks to implicit sharing.
Destroys the picture.
QRect QPicture::boundingRect() const
Returns the picture's bounding rectangle or an invalid rectangle if the picture contains no data.
See also setBoundingRect().
Returns a pointer to the picture data. The pointer is only valid until the next non-const function is called on this picture. The returned pointer is 0 if the picture contains no data.
true if the picture contains no data; otherwise returns false.
bool QPicture::load(const QString &fileName)
Loads a picture from the file specified by fileName and returns true if successful; otherwise invalidates the picture and returns
See also save().
bool QPicture::load(QIODevice *dev)
This is an overloaded function.
dev is the device to use for loading.
bool QPicture::play(QPainter *painter)
Replays the picture using painter, and returns
true if successful; otherwise returns
This function does exactly the same as QPainter::drawPicture() with (x, y) = (0, 0).
Note: The state of the painter isn't preserved by this function.
bool QPicture::save(const QString &fileName)
Saves a picture to the file specified by fileName and returns true if successful; otherwise returns
See also load().
bool QPicture::save(QIODevice *dev)
This is an overloaded function.
dev is the device to use for saving.
void QPicture::setBoundingRect(const QRect &r)
Sets the picture's bounding rectangle to r. The automatically calculated value is overridden.
See also boundingRect().
[virtual] void QPicture::setData(const char *data, uint size)
Sets the picture data directly from data and size. This function copies the input data.
uint QPicture::size() const
Returns the size of the picture data.
See also data().
[noexcept] void QPicture::swap(QPicture &other)
Swaps picture other with this picture. This operation is very fast and never fails.
Assigns picture p to this picture and returns a reference to this picture.
Move-assigns other to this QPicture instance.
© 2023 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.