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<td >Qt 5.9</td><td ><a href="qtgui-index.html">Qt GUI</a></td><td >Paint System</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#topics">Topics</a></li>
<li class="level1"><a href="#classes-for-painting">Classes for Painting</a></li>
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<h1 class="title">Paint System</h1>
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<p>Qt's paint system enables painting on screen and print devices using the same API, and is primarily based on the <a href="qpainter.html">QPainter</a>, <a href="qpaintdevice.html">QPaintDevice</a>, and <a href="qpaintengine.html">QPaintEngine</a> classes.</p>
<p><a href="qpainter.html">QPainter</a> is used to perform drawing operations, <a href="qpaintdevice.html">QPaintDevice</a> is an abstraction of a two-dimensional space that can be painted on using a <a href="qpainter.html">QPainter</a>, and <a href="qpaintengine.html">QPaintEngine</a> provides the interface that the painter uses to draw onto different types of devices. The <a href="qpaintengine.html">QPaintEngine</a> class is used internally by <a href="qpainter.html">QPainter</a> and <a href="qpaintdevice.html">QPaintDevice</a>, and is hidden from application programmers unless they create their own device type.</p>
<p class="centerAlign"><img src="images/paintsystem-core.png" alt="" /></p><p>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.</p>
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<h2 id="topics">Topics</h2>
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<li><a href="paintsystem.html#classes-for-painting">Classes for Painting</a></li>
<li><a href="paintsystem-devices.html">Paint Devices and Backends</a></li>
<li><a href="paintsystem-drawing.html">Drawing and Filling</a></li>
<li><a href="coordsys.html">Coordinate System</a></li>
<li><a href="paintsystem-images.html">Reading and Writing Image Files</a></li>
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<h2 id="classes-for-painting">Classes for Painting</h2>
<p>These classes provide support for painting onto a paint device.</p>
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<tr class="odd topAlign"><td class="tblName"><p><a href="../qtcore/qline.html">QLine</a></p></td><td class="tblDescr"><p>Two-dimensional vector using integer precision</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtcore/qlinef.html">QLineF</a></p></td><td class="tblDescr"><p>Two-dimensional vector using floating point precision</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtcore/qmargins.html">QMargins</a></p></td><td class="tblDescr"><p>Defines the four margins of a rectangle</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtcore/qmarginsf.html">QMarginsF</a></p></td><td class="tblDescr"><p>Defines the four margins of a rectangle</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtcore/qpoint.html">QPoint</a></p></td><td class="tblDescr"><p>Defines a point in the plane using integer precision</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtcore/qpointf.html">QPointF</a></p></td><td class="tblDescr"><p>Defines a point in the plane using floating point precision</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtcore/qrect.html">QRect</a></p></td><td class="tblDescr"><p>Defines a rectangle in the plane using integer precision</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtcore/qrectf.html">QRectF</a></p></td><td class="tblDescr"><p>Defines a rectangle in the plane using floating point precision</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtcore/qsize.html">QSize</a></p></td><td class="tblDescr"><p>Defines the size of a two-dimensional object using integer point precision</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtcore/qsizef.html">QSizeF</a></p></td><td class="tblDescr"><p>Defines the size of a two-dimensional object using floating point precision</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qbitmap.html">QBitmap</a></p></td><td class="tblDescr"><p>Monochrome (1-bit depth) pixmaps</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qicon.html">QIcon</a></p></td><td class="tblDescr"><p>Scalable icons in different modes and states</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qiconengine.html">QIconEngine</a></p></td><td class="tblDescr"><p>Abstract base class for QIcon renderers</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qimage.html">QImage</a></p></td><td class="tblDescr"><p>Hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qimagereader.html">QImageReader</a></p></td><td class="tblDescr"><p>Format independent interface for reading images from files or other devices</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qimagewriter.html">QImageWriter</a></p></td><td class="tblDescr"><p>Format independent interface for writing images to files or other devices</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qpixmap.html">QPixmap</a></p></td><td class="tblDescr"><p>Off-screen image representation that can be used as a paint device</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qgenericmatrix.html">QGenericMatrix</a></p></td><td class="tblDescr"><p>Template class that represents a NxM transformation matrix with N columns and M rows</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qvector2d.html">QVector2D</a></p></td><td class="tblDescr"><p>Represents a vector or vertex in 2D space</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qbrush.html">QBrush</a></p></td><td class="tblDescr"><p>Defines the fill pattern of shapes drawn by QPainter</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qconicalgradient.html">QConicalGradient</a></p></td><td class="tblDescr"><p>Used in combination with QBrush to specify a conical gradient brush</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qgradient.html">QGradient</a></p></td><td class="tblDescr"><p>Used in combination with QBrush to specify gradient fills</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qlineargradient.html">QLinearGradient</a></p></td><td class="tblDescr"><p>Used in combination with QBrush to specify a linear gradient brush</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qradialgradient.html">QRadialGradient</a></p></td><td class="tblDescr"><p>Used in combination with QBrush to specify a radial gradient brush</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qcolor.html">QColor</a></p></td><td class="tblDescr"><p>Colors based on RGB, HSV or CMYK values</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qpagedpaintdevice.html">QPagedPaintDevice</a></p></td><td class="tblDescr"><p>Represents a paintdevice that supports multiple pages</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qpaintdevice.html">QPaintDevice</a></p></td><td class="tblDescr"><p>The base class of objects that can be painted on with QPainter</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qpaintengine.html">QPaintEngine</a></p></td><td class="tblDescr"><p>Abstract definition of how QPainter draws to a given device on a given platform</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qpainter.html">QPainter</a></p></td><td class="tblDescr"><p>Performs low-level painting on widgets and other paint devices</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qpainterpath.html">QPainterPath</a></p></td><td class="tblDescr"><p>Container for painting operations, enabling graphical shapes to be constructed and reused</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qpainterpathstroker.html">QPainterPathStroker</a></p></td><td class="tblDescr"><p>Used to generate fillable outlines for a given painter path</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qpdfwriter.html">QPdfWriter</a></p></td><td class="tblDescr"><p>Class to generate PDFs that can be used as a paint device</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qpen.html">QPen</a></p></td><td class="tblDescr"><p>Defines how a QPainter should draw lines and outlines of shapes</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qpolygon.html">QPolygon</a></p></td><td class="tblDescr"><p>Vector of points using integer precision</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qpolygonf.html">QPolygonF</a></p></td><td class="tblDescr"><p>Vector of points using floating point precision</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qregion.html">QRegion</a></p></td><td class="tblDescr"><p>Specifies a clip region for a painter</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qrgba64.html">QRgba64</a></p></td><td class="tblDescr"><p>Struct contains a 64-bit RGB color</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qtransform.html">QTransform</a></p></td><td class="tblDescr"><p>Specifies 2D transformations of a coordinate system</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qfont.html">QFont</a></p></td><td class="tblDescr"><p>Specifies a font used for drawing text</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qfontmetrics.html">QFontMetrics</a></p></td><td class="tblDescr"><p>Font metrics information</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qfontmetricsf.html">QFontMetricsF</a></p></td><td class="tblDescr"><p>Font metrics information</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="">QPlatformFontDatabase</a></p></td><td class="tblDescr"><p>Makes it possible to customize how fonts are discovered and how they are rendered</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qsupportedwritingsystems.html">QSupportedWritingSystems</a></p></td><td class="tblDescr"><p>Used when registering fonts with the internal Qt fontdatabase</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="../qtwidgets/qstylepainter.html">QStylePainter</a></p></td><td class="tblDescr"><p>Convenience class for drawing QStyle elements inside a widget</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="../qtwidgets/qcolormap.html">QColormap</a></p></td><td class="tblDescr"><p>Maps device independent QColors to device dependent pixel values</p></td></tr>
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