QPicture

The QPicture class is a paint device that records and replays QPainter commands. More…

Inheritance diagram of PySide6.QtGui.QPicture

Synopsis

Functions

Virtual functions

Detailed Description

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:

picture = QPicture()
painter = QPainter()
painter.begin(picture) # paint in picture
painter.drawEllipse(10,20, 80,70) # draw an ellipse
painter.end() # painting done
picture.save("drawing.pic") # save picture

Note that the list of painter commands is reset on each call to the begin() function.

Example of how to replay a picture:

picture = QPicture()
picture.load("drawing.pic") # load picture
painter = QPainter()
painter.begin(myImage) # paint in myImage
painter.drawPicture(0, 0, picture) # draw the picture at (0,0)
painter.end() # painting done

Pictures can also be drawn using play() . Some basic data about a picture is available, for example, size() , isNull() and boundingRect() .

See also

QMovie

class PySide6.QtGui.QPicture(arg__1)

PySide6.QtGui.QPicture([formatVersion=-1])

Parameters

Constructs a copy of pic.

This constructor is fast thanks to implicit sharing .

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.

PySide6.QtGui.QPicture.boundingRect()
Return type

PySide6.QtCore.QRect

Returns the picture’s bounding rectangle or an invalid rectangle if the picture contains no data.

PySide6.QtGui.QPicture.data()
Return type

PyObject

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.

PySide6.QtGui.QPicture.isNull()
Return type

bool

Returns true if the picture contains no data; otherwise returns false.

PySide6.QtGui.QPicture.load(dev)
Parameters

dev – PySide6.QtCore.QIODevice

Return type

bool

This is an overloaded function.

dev is the device to use for loading.

PySide6.QtGui.QPicture.load(fileName)
Parameters

fileName – str

Return type

bool

Loads a picture from the file specified by fileName and returns true if successful; otherwise invalidates the picture and returns false.

See also

save()

PySide6.QtGui.QPicture.play(p)
Parameters

p – PySide6.QtGui.QPainter

Return type

bool

Replays the picture using painter, and returns true if successful; otherwise returns false.

This function does exactly the same as drawPicture() with (x, y) = (0, 0).

Note

The state of the painter isn’t preserved by this function.

PySide6.QtGui.QPicture.save(dev)
Parameters

dev – PySide6.QtCore.QIODevice

Return type

bool

This is an overloaded function.

dev is the device to use for saving.

PySide6.QtGui.QPicture.save(fileName)
Parameters

fileName – str

Return type

bool

Saves a picture to the file specified by fileName and returns true if successful; otherwise returns false.

See also

load()

PySide6.QtGui.QPicture.setBoundingRect(r)
Parameters

r – PySide6.QtCore.QRect

Sets the picture’s bounding rectangle to r. The automatically calculated value is overridden.

See also

boundingRect()

PySide6.QtGui.QPicture.setData(data)
Parameters

data – str

Sets the picture data directly from data and size. This function copies the input data.

See also

data() size()

PySide6.QtGui.QPicture.size()
Return type

uint

Returns the size of the picture data.

See also

data()

PySide6.QtGui.QPicture.swap(other)
Parameters

other – PySide6.QtGui.QPicture

Swaps picture other with this picture. This operation is very fast and never fails.