<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- qgraphicstransform.cpp --> <title>QGraphicsScale Class | Qt Widgets 5.12.6</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-module.html">C++ Classes</a></td><td >QGraphicsScale</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtwidgets-index.html">Qt 5.12.6 Reference Documentation</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"> <div class="toc"> <h3><a name="toc">Contents</a></h3> <ul> <li class="level1"><a href="#properties">Properties</a></li> <li class="level1"><a href="#public-functions">Public Functions</a></li> <li class="level1"><a href="#reimplemented-public-functions">Reimplemented Public Functions</a></li> <li class="level1"><a href="#signals">Signals</a></li> <li class="level1"><a href="#static-public-members">Static Public Members</a></li> <li class="level1"><a href="#details">Detailed Description</a></li> </ul> </div> <div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">QGraphicsScale Class</h1> <!-- $$$QGraphicsScale-brief --> <p>The <a href="qgraphicsscale.html">QGraphicsScale</a> class provides a scale transformation. <a href="#details">More...</a></p> <!-- @@@QGraphicsScale --> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QGraphicsScale></span> </td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += widgets</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 4.6</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qgraphicstransform.html">QGraphicsTransform</a></td></tr></table></div><ul> <li><a href="qgraphicsscale-members.html">List of all members, including inherited members</a></li> <li><a href="qgraphicsscale-obsolete.html">Obsolete members</a></li> </ul> <a name="properties"></a> <h2 id="properties">Properties</h2> <ul> <li class="fn"><b><a href="qgraphicsscale.html#origin-prop">origin</a></b> : QVector3D</li> <li class="fn"><b><a href="qgraphicsscale.html#xScale-prop">xScale</a></b> : qreal</li> <li class="fn"><b><a href="qgraphicsscale.html#yScale-prop">yScale</a></b> : qreal</li> <li class="fn"><b><a href="qgraphicsscale.html#zScale-prop">zScale</a></b> : qreal</li> </ul> <ul> <li class="fn">1 property inherited from <a href="../qtcore/qobject.html#properties">QObject</a></li> </ul> <a name="public-functions"></a> <h2 id="public-functions">Public Functions</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#QGraphicsScale">QGraphicsScale</a></b>(QObject *<i>parent</i> = nullptr)</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> virtual </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#dtor.QGraphicsScale">~QGraphicsScale</a></b>()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> QVector3D </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#origin-prop">origin</a></b>() const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#origin-prop">setOrigin</a></b>(const QVector3D &<i>point</i>)</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#xScale-prop">setXScale</a></b>(<i>qreal</i>)</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#yScale-prop">setYScale</a></b>(<i>qreal</i>)</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#zScale-prop">setZScale</a></b>(<i>qreal</i>)</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> qreal </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#xScale-prop">xScale</a></b>() const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> qreal </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#yScale-prop">yScale</a></b>() const</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> qreal </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#zScale-prop">zScale</a></b>() const</td></tr> </table></div> <a name="reimplemented-public-functions"></a> <h2 id="reimplemented-public-functions">Reimplemented Public Functions</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#applyTo">applyTo</a></b>(QMatrix4x4 *<i>matrix</i>) const override</td></tr> </table></div> <ul> <li class="fn">1 public function inherited from <a href="qgraphicstransform.html#public-functions">QGraphicsTransform</a></li> <li class="fn">31 public functions inherited from <a href="../qtcore/qobject.html#public-functions">QObject</a></li> </ul> <a name="signals"></a> <h2 id="signals">Signals</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#originChanged">originChanged</a></b>()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#scaleChanged">scaleChanged</a></b>()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#xScaleChanged">xScaleChanged</a></b>()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#yScaleChanged">yScaleChanged</a></b>()</td></tr> <tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#zScaleChanged">zScaleChanged</a></b>()</td></tr> </table></div> <ul> <li class="fn">2 signals inherited from <a href="../qtcore/qobject.html#signals">QObject</a></li> </ul> <a name="static-public-members"></a> <h2 id="static-public-members">Static Public Members</h2> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft rightAlign topAlign"> const QMetaObject </td><td class="memItemRight bottomAlign"><b><a href="qgraphicsscale.html#staticMetaObject-var">staticMetaObject</a></b></td></tr> </table></div> <ul> <li class="fn">9 static public members inherited from <a href="../qtcore/qobject.html#static-public-members">QObject</a></li> </ul> <h3>Additional Inherited Members</h3> <ul> <li class="fn">1 public slot inherited from <a href="../qtcore/qobject.html#public-slots">QObject</a></li> <li class="fn">9 protected functions inherited from <a href="../qtcore/qobject.html#protected-functions">QObject</a></li> <li class="fn">1 protected slot inherited from <a href="qgraphicstransform.html#protected-slots">QGraphicsTransform</a></li> </ul> <a name="details"></a> <!-- $$$QGraphicsScale-description --> <div class="descr"> <h2 id="details">Detailed Description</h2> <p>The <a href="qgraphicsscale.html">QGraphicsScale</a> class provides a scale transformation.</p> <p><a href="qgraphicsscene.html">QGraphicsScene</a> provides certain parameters to help control how the scale should be applied.</p> <p>The origin is the point that the item is scaled from (i.e., it stays fixed relative to the parent as the rest of the item grows). By default the origin is <a href="../qtcore/qpointf.html">QPointF</a>(0, 0).</p> <p>The parameters <a href="qgraphicsscale.html#xScale-prop">xScale</a>, <a href="qgraphicsscale.html#yScale-prop">yScale</a>, and <a href="qgraphicsscale.html#zScale-prop">zScale</a> describe the scale factors to apply in horizontal, vertical, and depth directions. They can take on any value, including 0 (to collapse the item to a point) or negative value. A negative <a href="qgraphicsscale.html#xScale-prop">xScale</a> value will mirror the item horizontally. A negative <a href="qgraphicsscale.html#yScale-prop">yScale</a> value will flip the item vertically. A negative <a href="qgraphicsscale.html#zScale-prop">zScale</a> will flip the item end for end.</p> </div> <p><b>See also </b><a href="qgraphicstransform.html">QGraphicsTransform</a>, <a href="qgraphicsitem.html#setScale">QGraphicsItem::setScale</a>(), and <a href="../qtgui/qtransform.html#scale">QTransform::scale</a>().</p> <!-- @@@QGraphicsScale --> <div class="prop"> <h2>Property Documentation</h2> <!-- $$$origin-prop$$$origin$$$setOriginconstQVector3D&$$$originChanged --> <h3 class="fn" id="origin-prop"><a name="origin-prop"></a><span class="name">origin</span> : <span class="type"><a href="../qtgui/qvector3d.html">QVector3D</a></span></h3> <p>This property holds the origin of the scale in 3D space.</p> <p>All scaling will be done relative to this point (i.e., this point will stay fixed, relative to the parent, when the item is scaled).</p> <p><b>Access functions:</b></p> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft topAlign rightAlign"> QVector3D </td><td class="memItemRight bottomAlign"><span class="name"><b>origin</b></span>() const</td></tr> <tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setOrigin</b></span>(const QVector3D &<i>point</i>)</td></tr> </table></div> <p><b>Notifier signal:</b></p> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qgraphicsscale.html#originChanged">originChanged</a></b></span>()</td></tr> </table></div> <p><b>See also </b><a href="qgraphicsscale.html#xScale-prop">xScale</a>, <a href="qgraphicsscale.html#yScale-prop">yScale</a>, and <a href="qgraphicsscale.html#zScale-prop">zScale</a>.</p> <!-- @@@origin --> <!-- $$$xScale-prop$$$xScale$$$setXScaleqreal$$$xScaleChanged --> <h3 class="fn" id="xScale-prop"><a name="xScale-prop"></a><span class="name">xScale</span> : <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span></h3> <p>This property holds the horizontal scale factor.</p> <p>The scale factor can be any real number; the default value is 1.0. If you set the factor to 0.0, the item will be collapsed to a single point. If you provide a negative value, the item will be mirrored horizontally around its origin.</p> <p><b>Access functions:</b></p> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft topAlign rightAlign"> qreal </td><td class="memItemRight bottomAlign"><span class="name"><b>xScale</b></span>() const</td></tr> <tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setXScale</b></span>(<i>qreal</i>)</td></tr> </table></div> <p><b>Notifier signal:</b></p> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qgraphicsscale.html#xScaleChanged">xScaleChanged</a></b></span>()</td></tr> </table></div> <p><b>See also </b><a href="qgraphicsscale.html#yScale-prop">yScale</a>, <a href="qgraphicsscale.html#zScale-prop">zScale</a>, and <a href="stylesheet-reference.html#origin">origin</a>.</p> <!-- @@@xScale --> <!-- $$$yScale-prop$$$yScale$$$setYScaleqreal$$$yScaleChanged --> <h3 class="fn" id="yScale-prop"><a name="yScale-prop"></a><span class="name">yScale</span> : <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span></h3> <p>This property holds the vertical scale factor.</p> <p>The scale factor can be any real number; the default value is 1.0. If you set the factor to 0.0, the item will be collapsed to a single point. If you provide a negative value, the item will be flipped vertically around its origin.</p> <p><b>Access functions:</b></p> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft topAlign rightAlign"> qreal </td><td class="memItemRight bottomAlign"><span class="name"><b>yScale</b></span>() const</td></tr> <tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setYScale</b></span>(<i>qreal</i>)</td></tr> </table></div> <p><b>Notifier signal:</b></p> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qgraphicsscale.html#yScaleChanged">yScaleChanged</a></b></span>()</td></tr> </table></div> <p><b>See also </b><a href="qgraphicsscale.html#xScale-prop">xScale</a>, <a href="qgraphicsscale.html#zScale-prop">zScale</a>, and <a href="stylesheet-reference.html#origin">origin</a>.</p> <!-- @@@yScale --> <!-- $$$zScale-prop$$$zScale$$$setZScaleqreal$$$zScaleChanged --> <h3 class="fn" id="zScale-prop"><a name="zScale-prop"></a><span class="name">zScale</span> : <span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span></h3> <p>This property holds the depth scale factor.</p> <p>The scale factor can be any real number; the default value is 1.0. If you set the factor to 0.0, the item will be collapsed to a single point. If you provide a negative value, the item will be flipped end for end around its origin.</p> <p><b>Access functions:</b></p> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft topAlign rightAlign"> qreal </td><td class="memItemRight bottomAlign"><span class="name"><b>zScale</b></span>() const</td></tr> <tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setZScale</b></span>(<i>qreal</i>)</td></tr> </table></div> <p><b>Notifier signal:</b></p> <div class="table"><table class="alignedsummary"> <tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b><a href="qgraphicsscale.html#zScaleChanged">zScaleChanged</a></b></span>()</td></tr> </table></div> <p><b>See also </b><a href="qgraphicsscale.html#xScale-prop">xScale</a>, <a href="qgraphicsscale.html#yScale-prop">yScale</a>, and <a href="stylesheet-reference.html#origin">origin</a>.</p> <!-- @@@zScale --> </div> <div class="func"> <h2>Member Function Documentation</h2> <!-- $$$QGraphicsScale[overload1]$$$QGraphicsScaleQObject* --> <h3 class="fn" id="QGraphicsScale"><a name="QGraphicsScale"></a>QGraphicsScale::<span class="name">QGraphicsScale</span>(<span class="type"><a href="../qtcore/qobject.html#QObject">QObject</a></span> *<i>parent</i> = nullptr)</h3> <p>Constructs an empty <a href="qgraphicsscale.html">QGraphicsScale</a> object with the given <i>parent</i>.</p> <!-- @@@QGraphicsScale --> <!-- $$$~QGraphicsScale[overload1]$$$~QGraphicsScale --> <h3 class="fn" id="dtor.QGraphicsScale"><a name="dtor.QGraphicsScale"></a><code>[virtual] </code>QGraphicsScale::<span class="name">~QGraphicsScale</span>()</h3> <p>Destroys the graphics scale.</p> <!-- @@@~QGraphicsScale --> <!-- $$$applyTo[overload1]$$$applyToQMatrix4x4* --> <h3 class="fn" id="applyTo"><a name="applyTo"></a><code>[override virtual] </code><span class="type">void</span> QGraphicsScale::<span class="name">applyTo</span>(<span class="type"><a href="../qtgui/qmatrix4x4.html">QMatrix4x4</a></span> *<i>matrix</i>) const</h3> <p>Reimplemented from <a href="qgraphicstransform.html#applyTo">QGraphicsTransform::applyTo</a>().</p> <!-- @@@applyTo --> <!-- $$$originChanged --> <h3 class="fn" id="originChanged"><a name="originChanged"></a><code>[signal] </code><span class="type">void</span> QGraphicsScale::<span class="name">originChanged</span>()</h3> <p><a href="qgraphicsscale.html">QGraphicsScale</a> emits this signal when its origin changes.</p> <p><b>Note:</b> Notifier signal for property <a href="qgraphicsscale.html#origin-prop">origin</a>. </p><p><b>See also </b><a href="qgraphicsscale.html#origin-prop">QGraphicsScale::origin</a>.</p> <!-- @@@originChanged --> <!-- $$$scaleChanged[overload1]$$$scaleChanged --> <h3 class="fn" id="scaleChanged"><a name="scaleChanged"></a><code>[signal] </code><span class="type">void</span> QGraphicsScale::<span class="name">scaleChanged</span>()</h3> <p>This signal is emitted whenever the <a href="qgraphicsscale.html#xScale-prop">xScale</a>, <a href="qgraphicsscale.html#yScale-prop">yScale</a>, or <a href="qgraphicsscale.html#zScale-prop">zScale</a> of the object changes.</p> <p><b>See also </b><a href="qgraphicsscale.html#xScale-prop">QGraphicsScale::xScale</a>, <a href="qgraphicsscale.html#yScale-prop">QGraphicsScale::yScale</a>, and <a href="qgraphicsscale.html#zScale-prop">QGraphicsScale::zScale</a>.</p> <!-- @@@scaleChanged --> <!-- $$$xScaleChanged --> <h3 class="fn" id="xScaleChanged"><a name="xScaleChanged"></a><code>[signal] </code><span class="type">void</span> QGraphicsScale::<span class="name">xScaleChanged</span>()</h3> <p>This signal is emitted whenever the <a href="qgraphicsscale.html#xScale-prop">xScale</a> property changes.</p> <p>This function was introduced in Qt 4.7.</p> <p><b>Note:</b> Notifier signal for property <a href="qgraphicsscale.html#xScale-prop">xScale</a>. </p><!-- @@@xScaleChanged --> <!-- $$$yScaleChanged --> <h3 class="fn" id="yScaleChanged"><a name="yScaleChanged"></a><code>[signal] </code><span class="type">void</span> QGraphicsScale::<span class="name">yScaleChanged</span>()</h3> <p>This signal is emitted whenever the <a href="qgraphicsscale.html#yScale-prop">yScale</a> property changes.</p> <p>This function was introduced in Qt 4.7.</p> <p><b>Note:</b> Notifier signal for property <a href="qgraphicsscale.html#yScale-prop">yScale</a>. </p><!-- @@@yScaleChanged --> <!-- $$$zScaleChanged --> <h3 class="fn" id="zScaleChanged"><a name="zScaleChanged"></a><code>[signal] </code><span class="type">void</span> QGraphicsScale::<span class="name">zScaleChanged</span>()</h3> <p>This signal is emitted whenever the <a href="qgraphicsscale.html#zScale-prop">zScale</a> property changes.</p> <p>This function was introduced in Qt 4.7.</p> <p><b>Note:</b> Notifier signal for property <a href="qgraphicsscale.html#zScale-prop">zScale</a>. </p><!-- @@@zScaleChanged --> </div> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br/> 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. </p> </div> </body> </html>