Paint System#

A system for painting on the screen or on print devices using the same API

Qt’s paint system enables painting on screen and print devices using the same API, and is primarily based on the QPainter , QPaintDevice , and QPaintEngine classes.

QPainter is used to perform drawing operations, QPaintDevice is an abstraction of a two-dimensional space that can be painted on using a QPainter , and QPaintEngine provides the interface that the painter uses to draw onto different types of devices. The QPaintEngine class is used internally by QPainter and QPaintDevice , and is hidden from application programmers unless they create their own device type.

The main benefit of this approach is that all painting follows the same painting pipeline making it easy to add support for new features and providing default implementations for unsupported ones.

Topics#

Classes for Painting

Paint Devices and Backends

Drawing and Filling

Coordinate System

Reading and Writing Image Files

Classes for Painting#

These classes provide support for painting onto a paint device.

PySide6.QtGui.QBitmap

The QBitmap class provides monochrome (1-bit depth) pixmaps.

PySide6.QtGui.QIcon

The QIcon class provides scalable icons in different modes and states.

PySide6.QtGui.QIconEngine

The QIconEngine class provides an abstract base class for QIcon renderers.

PySide6.QtGui.QImage

The QImage class provides a hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device.

PySide6.QtGui.QImageReader

The QImageReader class provides a format independent interface for reading images from files or other devices.

PySide6.QtGui.QImageWriter

The QImageWriter class provides a format independent interface for writing images to files or other devices.

PySide6.QtGui.QPixmap

The QPixmap class is an off-screen image representation that can be used as a paint device.

PySide6.QtGui.QGenericMatrix

The QGenericMatrix class is a template class that represents a NxM transformation matrix with N columns and M rows.

PySide6.QtGui.QVector2D

The QVector2D class represents a vector or vertex in 2D space.

PySide6.QtGui.QBrush

The QBrush class defines the fill pattern of shapes drawn by QPainter.

PySide6.QtGui.QGradient

The QGradient class is used in combination with QBrush to specify gradient fills.

PySide6.QtGui.QLinearGradient

The QLinearGradient class is used in combination with QBrush to specify a linear gradient brush.

PySide6.QtGui.QRadialGradient

The QRadialGradient class is used in combination with QBrush to specify a radial gradient brush.

PySide6.QtGui.QConicalGradient

The QConicalGradient class is used in combination with QBrush to specify a conical gradient brush.

PySide6.QtGui.QColor

The QColor class provides colors based on RGB, HSV or CMYK values.

PySide6.QtGui.QColorSpace

The QColorSpace class provides a color space abstraction.

PySide6.QtGui.QColorTransform

The QColorTransform class is a transformation between color spaces.

PySide6.QtGui.QPagedPaintDevice

The QPagedPaintDevice class represents a paint device that supports multiple pages.

PySide6.QtGui.QPageRanges

The QPageRanges class represents a collection of page ranges.

PySide6.QtGui.QPaintDevice

The QPaintDevice class is the base class of objects that can be painted on with QPainter.

PySide6.QtGui.QPaintEngine

The QPaintEngine class provides an abstract definition of how QPainter draws to a given device on a given platform.

PySide6.QtGui.QPainter

The QPainter class performs low-level painting on widgets and other paint devices.

PySide6.QtGui.QPainterPath

The QPainterPath class provides a container for painting operations, enabling graphical shapes to be constructed and reused.

PySide6.QtGui.QPainterPathStroker

The QPainterPathStroker class is used to generate fillable outlines for a given painter path.

PySide6.QtGui.QPdfWriter

The QPdfWriter class is a class to generate PDFs that can be used as a paint device.

PySide6.QtGui.QPen

The QPen class defines how a QPainter should draw lines and outlines of shapes.

PySide6.QtGui.QPolygon

The QPolygon class provides a list of points using integer precision.

PySide6.QtGui.QPolygonF

The QPolygonF class provides a list of points using floating point precision.

PySide6.QtGui.QRegion

The QRegion class specifies a clip region for a painter.

PySide6.QtGui.QRgba64

The QRgba64 struct contains a 64-bit RGB color.

QRgbaFloat

The QRgbaFloat struct contains a four part RGBA floating-point color.

PySide6.QtGui.QTransform

The QTransform class specifies 2D transformations of a coordinate system.

PySide6.QtGui.QFont

The QFont class specifies a query for a font used for drawing text.

PySide6.QtGui.QFontMetrics

The QFontMetrics class provides font metrics information.

PySide6.QtGui.QFontMetricsF

The QFontMetricsF class provides font metrics information.

QSupportedWritingSystems

The QSupportedWritingSystems class is used when registering fonts with the internal Qt fontdatabase.

PySide6.QtCore.QLine

The QLine class provides a two-dimensional vector using integer precision.

PySide6.QtCore.QLineF

The QLineF class provides a two-dimensional vector using floating point precision.

PySide6.QtCore.QMargins

The QMargins class defines the four margins of a rectangle.

PySide6.QtCore.QMarginsF

The QMarginsF class defines the four margins of a rectangle.

PySide6.QtCore.QPoint

The QPoint class defines a point in the plane using integer precision.

PySide6.QtCore.QPointF

The QPointF class defines a point in the plane using floating point precision.

PySide6.QtCore.QRect

The QRect class defines a rectangle in the plane using integer precision.

PySide6.QtCore.QRectF

The QRectF class defines a finite rectangle in the plane using floating point precision.

PySide6.QtCore.QSize

The QSize class defines the size of a two-dimensional object using integer point precision.

PySide6.QtCore.QSizeF

The QSizeF class defines the size of a two-dimensional object using floating point precision.

PySide6.QtSvg.QSvgGenerator

The QSvgGenerator class provides a paint device that is used to create SVG drawings.

PySide6.QtSvg.QSvgRenderer

The QSvgRenderer class is used to draw the contents of SVG files onto paint devices.

PySide6.QtSvgWidgets.QSvgWidget

The QSvgWidget class provides a widget that is used to display the contents of Scalable Vector Graphics (SVG) files.

The QPixmapFilter class provides the basic functionality for pixmap filter classes. Pixmap filter can be for example colorize or blur.

The QPixmapConvolutionFilter class provides convolution filtering for pixmaps.

The QPixmapColorizeFilter class provides colorizing filtering for pixmaps.

The QPixmapDropShadowFilter class is a convenience class for drawing pixmaps with drop shadows.

PySide6.QtWidgets.QStylePainter

The QStylePainter class is a convenience class for drawing QStyle elements inside a widget.

PySide6.QtWidgets.QColormap

The QColormap class maps device independent QColors to device dependent pixel values.

`PySide6.QtGui.QBitmap`	The QBitmap class provides monochrome (1-bit depth) pixmaps.
`PySide6.QtGui.QIcon`	The QIcon class provides scalable icons in different modes and states.
`PySide6.QtGui.QIconEngine`	The QIconEngine class provides an abstract base class for QIcon renderers.
`PySide6.QtGui.QImage`	The QImage class provides a hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device.
`PySide6.QtGui.QImageReader`	The QImageReader class provides a format independent interface for reading images from files or other devices.
`PySide6.QtGui.QImageWriter`	The QImageWriter class provides a format independent interface for writing images to files or other devices.
`PySide6.QtGui.QPixmap`	The QPixmap class is an off-screen image representation that can be used as a paint device.
`PySide6.QtGui.QGenericMatrix`	The QGenericMatrix class is a template class that represents a NxM transformation matrix with N columns and M rows.
`PySide6.QtGui.QVector2D`	The QVector2D class represents a vector or vertex in 2D space.
`PySide6.QtGui.QBrush`	The QBrush class defines the fill pattern of shapes drawn by QPainter.
`PySide6.QtGui.QGradient`	The QGradient class is used in combination with QBrush to specify gradient fills.
`PySide6.QtGui.QLinearGradient`	The QLinearGradient class is used in combination with QBrush to specify a linear gradient brush.
`PySide6.QtGui.QRadialGradient`	The QRadialGradient class is used in combination with QBrush to specify a radial gradient brush.
`PySide6.QtGui.QConicalGradient`	The QConicalGradient class is used in combination with QBrush to specify a conical gradient brush.
`PySide6.QtGui.QColor`	The QColor class provides colors based on RGB, HSV or CMYK values.
`PySide6.QtGui.QColorSpace`	The QColorSpace class provides a color space abstraction.
`PySide6.QtGui.QColorTransform`	The QColorTransform class is a transformation between color spaces.
`PySide6.QtGui.QPagedPaintDevice`	The QPagedPaintDevice class represents a paint device that supports multiple pages.
`PySide6.QtGui.QPageRanges`	The QPageRanges class represents a collection of page ranges.
`PySide6.QtGui.QPaintDevice`	The QPaintDevice class is the base class of objects that can be painted on with QPainter.
`PySide6.QtGui.QPaintEngine`	The QPaintEngine class provides an abstract definition of how QPainter draws to a given device on a given platform.
`PySide6.QtGui.QPainter`	The QPainter class performs low-level painting on widgets and other paint devices.
`PySide6.QtGui.QPainterPath`	The QPainterPath class provides a container for painting operations, enabling graphical shapes to be constructed and reused.
`PySide6.QtGui.QPainterPathStroker`	The QPainterPathStroker class is used to generate fillable outlines for a given painter path.
`PySide6.QtGui.QPdfWriter`	The QPdfWriter class is a class to generate PDFs that can be used as a paint device.
`PySide6.QtGui.QPen`	The QPen class defines how a QPainter should draw lines and outlines of shapes.
`PySide6.QtGui.QPolygon`	The QPolygon class provides a list of points using integer precision.
`PySide6.QtGui.QPolygonF`	The QPolygonF class provides a list of points using floating point precision.
`PySide6.QtGui.QRegion`	The QRegion class specifies a clip region for a painter.
`PySide6.QtGui.QRgba64`	The QRgba64 struct contains a 64-bit RGB color.
`QRgbaFloat`	The QRgbaFloat struct contains a four part RGBA floating-point color.
`PySide6.QtGui.QTransform`	The QTransform class specifies 2D transformations of a coordinate system.
`PySide6.QtGui.QFont`	The QFont class specifies a query for a font used for drawing text.
`PySide6.QtGui.QFontMetrics`	The QFontMetrics class provides font metrics information.
`PySide6.QtGui.QFontMetricsF`	The QFontMetricsF class provides font metrics information.
`QSupportedWritingSystems`	The QSupportedWritingSystems class is used when registering fonts with the internal Qt fontdatabase.
`PySide6.QtCore.QLine`	The QLine class provides a two-dimensional vector using integer precision.
`PySide6.QtCore.QLineF`	The QLineF class provides a two-dimensional vector using floating point precision.
`PySide6.QtCore.QMargins`	The QMargins class defines the four margins of a rectangle.
`PySide6.QtCore.QMarginsF`	The QMarginsF class defines the four margins of a rectangle.
`PySide6.QtCore.QPoint`	The QPoint class defines a point in the plane using integer precision.
`PySide6.QtCore.QPointF`	The QPointF class defines a point in the plane using floating point precision.
`PySide6.QtCore.QRect`	The QRect class defines a rectangle in the plane using integer precision.
`PySide6.QtCore.QRectF`	The QRectF class defines a finite rectangle in the plane using floating point precision.
`PySide6.QtCore.QSize`	The QSize class defines the size of a two-dimensional object using integer point precision.
`PySide6.QtCore.QSizeF`	The QSizeF class defines the size of a two-dimensional object using floating point precision.
`PySide6.QtSvg.QSvgGenerator`	The QSvgGenerator class provides a paint device that is used to create SVG drawings.
`PySide6.QtSvg.QSvgRenderer`	The QSvgRenderer class is used to draw the contents of SVG files onto paint devices.
`PySide6.QtSvgWidgets.QSvgWidget`	The QSvgWidget class provides a widget that is used to display the contents of Scalable Vector Graphics (SVG) files.
	The QPixmapFilter class provides the basic functionality for pixmap filter classes. Pixmap filter can be for example colorize or blur.
	The QPixmapConvolutionFilter class provides convolution filtering for pixmaps.
	The QPixmapColorizeFilter class provides colorizing filtering for pixmaps.
	The QPixmapDropShadowFilter class is a convenience class for drawing pixmaps with drop shadows.
`PySide6.QtWidgets.QStylePainter`	The QStylePainter class is a convenience class for drawing QStyle elements inside a widget.
`PySide6.QtWidgets.QColormap`	The QColormap class maps device independent QColors to device dependent pixel values.