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<h1 class="title">view.cpp Example File</h1>
<span class="small-subtitle">demos/chip/view.cpp</span>
<!-- $$$demos/chip/view.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &quot;view.h&quot;</span>
<span class="preprocessor">#include &lt;QtGui&gt;</span>
<span class="preprocessor">#ifndef QT_NO_OPENGL</span>
<span class="preprocessor">#include &lt;QtOpenGL&gt;</span>
<span class="preprocessor">#endif</span>
<span class="preprocessor">#include &lt;qmath.h&gt;</span>
<span class="type">void</span> GraphicsView<span class="operator">::</span>wheelEvent(<span class="type"><a href="qwheelevent.html">QWheelEvent</a></span> <span class="operator">*</span>e)
{
<span class="keyword">if</span> (e<span class="operator">-</span><span class="operator">&gt;</span>modifiers() <span class="operator">&amp;</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ControlModifier) {
<span class="keyword">if</span> (e<span class="operator">-</span><span class="operator">&gt;</span>delta() <span class="operator">&gt;</span> <span class="number">0</span>)
view<span class="operator">-</span><span class="operator">&gt;</span>zoomIn(<span class="number">6</span>);
<span class="keyword">else</span>
view<span class="operator">-</span><span class="operator">&gt;</span>zoomOut(<span class="number">6</span>);
e<span class="operator">-</span><span class="operator">&gt;</span>accept();
} <span class="keyword">else</span> {
<span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>wheelEvent(e);
}
}
View<span class="operator">::</span>View(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>name<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qframe.html">QFrame</a></span>(parent)
{
setFrameStyle(Sunken <span class="operator">|</span> StyledPanel);
graphicsView <span class="operator">=</span> <span class="keyword">new</span> GraphicsView(<span class="keyword">this</span>);
graphicsView<span class="operator">-</span><span class="operator">&gt;</span>setRenderHint(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing<span class="operator">,</span> <span class="keyword">false</span>);
graphicsView<span class="operator">-</span><span class="operator">&gt;</span>setDragMode(<span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>RubberBandDrag);
graphicsView<span class="operator">-</span><span class="operator">&gt;</span>setOptimizationFlags(<span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>DontSavePainterState);
graphicsView<span class="operator">-</span><span class="operator">&gt;</span>setViewportUpdateMode(<span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>SmartViewportUpdate);
graphicsView<span class="operator">-</span><span class="operator">&gt;</span>setTransformationAnchor(<span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>AnchorUnderMouse);
<span class="type">int</span> size <span class="operator">=</span> style()<span class="operator">-</span><span class="operator">&gt;</span>pixelMetric(<span class="type"><a href="qstyle.html">QStyle</a></span><span class="operator">::</span>PM_ToolBarIconSize);
<span class="type"><a href="qsize.html">QSize</a></span> iconSize(size<span class="operator">,</span> size);
<span class="type"><a href="qtoolbutton.html">QToolButton</a></span> <span class="operator">*</span>zoomInIcon <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
zoomInIcon<span class="operator">-</span><span class="operator">&gt;</span>setAutoRepeat(<span class="keyword">true</span>);
zoomInIcon<span class="operator">-</span><span class="operator">&gt;</span>setAutoRepeatInterval(<span class="number">33</span>);
zoomInIcon<span class="operator">-</span><span class="operator">&gt;</span>setAutoRepeatDelay(<span class="number">0</span>);
zoomInIcon<span class="operator">-</span><span class="operator">&gt;</span>setIcon(<span class="type"><a href="qpixmap.html">QPixmap</a></span>(<span class="string">&quot;:/zoomin.png&quot;</span>));
zoomInIcon<span class="operator">-</span><span class="operator">&gt;</span>setIconSize(iconSize);
<span class="type"><a href="qtoolbutton.html">QToolButton</a></span> <span class="operator">*</span>zoomOutIcon <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
zoomOutIcon<span class="operator">-</span><span class="operator">&gt;</span>setAutoRepeat(<span class="keyword">true</span>);
zoomOutIcon<span class="operator">-</span><span class="operator">&gt;</span>setAutoRepeatInterval(<span class="number">33</span>);
zoomOutIcon<span class="operator">-</span><span class="operator">&gt;</span>setAutoRepeatDelay(<span class="number">0</span>);
zoomOutIcon<span class="operator">-</span><span class="operator">&gt;</span>setIcon(<span class="type"><a href="qpixmap.html">QPixmap</a></span>(<span class="string">&quot;:/zoomout.png&quot;</span>));
zoomOutIcon<span class="operator">-</span><span class="operator">&gt;</span>setIconSize(iconSize);
zoomSlider <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qslider.html">QSlider</a></span>;
zoomSlider<span class="operator">-</span><span class="operator">&gt;</span>setMinimum(<span class="number">0</span>);
zoomSlider<span class="operator">-</span><span class="operator">&gt;</span>setMaximum(<span class="number">500</span>);
zoomSlider<span class="operator">-</span><span class="operator">&gt;</span>setValue(<span class="number">250</span>);
zoomSlider<span class="operator">-</span><span class="operator">&gt;</span>setTickPosition(<span class="type"><a href="qslider.html">QSlider</a></span><span class="operator">::</span>TicksRight);
<span class="comment">// Zoom slider layout</span>
<span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>zoomSliderLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>;
zoomSliderLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(zoomInIcon);
zoomSliderLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(zoomSlider);
zoomSliderLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(zoomOutIcon);
<span class="type"><a href="qtoolbutton.html">QToolButton</a></span> <span class="operator">*</span>rotateLeftIcon <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
rotateLeftIcon<span class="operator">-</span><span class="operator">&gt;</span>setIcon(<span class="type"><a href="qpixmap.html">QPixmap</a></span>(<span class="string">&quot;:/rotateleft.png&quot;</span>));
rotateLeftIcon<span class="operator">-</span><span class="operator">&gt;</span>setIconSize(iconSize);
<span class="type"><a href="qtoolbutton.html">QToolButton</a></span> <span class="operator">*</span>rotateRightIcon <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
rotateRightIcon<span class="operator">-</span><span class="operator">&gt;</span>setIcon(<span class="type"><a href="qpixmap.html">QPixmap</a></span>(<span class="string">&quot;:/rotateright.png&quot;</span>));
rotateRightIcon<span class="operator">-</span><span class="operator">&gt;</span>setIconSize(iconSize);
rotateSlider <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qslider.html">QSlider</a></span>;
rotateSlider<span class="operator">-</span><span class="operator">&gt;</span>setOrientation(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Horizontal);
rotateSlider<span class="operator">-</span><span class="operator">&gt;</span>setMinimum(<span class="operator">-</span><span class="number">360</span>);
rotateSlider<span class="operator">-</span><span class="operator">&gt;</span>setMaximum(<span class="number">360</span>);
rotateSlider<span class="operator">-</span><span class="operator">&gt;</span>setValue(<span class="number">0</span>);
rotateSlider<span class="operator">-</span><span class="operator">&gt;</span>setTickPosition(<span class="type"><a href="qslider.html">QSlider</a></span><span class="operator">::</span>TicksBelow);
<span class="comment">// Rotate slider layout</span>
<span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span> <span class="operator">*</span>rotateSliderLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span>;
rotateSliderLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(rotateLeftIcon);
rotateSliderLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(rotateSlider);
rotateSliderLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(rotateRightIcon);
resetButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
resetButton<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;0&quot;</span>));
resetButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
<span class="comment">// Label layout</span>
<span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span> <span class="operator">*</span>labelLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span>;
label <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(name);
label2 <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;Pointer Mode&quot;</span>));
selectModeButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
selectModeButton<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Select&quot;</span>));
selectModeButton<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
selectModeButton<span class="operator">-</span><span class="operator">&gt;</span>setChecked(<span class="keyword">true</span>);
dragModeButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
dragModeButton<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Drag&quot;</span>));
dragModeButton<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
dragModeButton<span class="operator">-</span><span class="operator">&gt;</span>setChecked(<span class="keyword">false</span>);
antialiasButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
antialiasButton<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Antialiasing&quot;</span>));
antialiasButton<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
antialiasButton<span class="operator">-</span><span class="operator">&gt;</span>setChecked(<span class="keyword">false</span>);
openGlButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
openGlButton<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;OpenGL&quot;</span>));
openGlButton<span class="operator">-</span><span class="operator">&gt;</span>setCheckable(<span class="keyword">true</span>);
<span class="preprocessor">#ifndef QT_NO_OPENGL</span>
openGlButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="type"><a href="qglformat.html">QGLFormat</a></span><span class="operator">::</span>hasOpenGL());
<span class="preprocessor">#else</span>
openGlButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
<span class="preprocessor">#endif</span>
printButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbutton.html">QToolButton</a></span>;
printButton<span class="operator">-</span><span class="operator">&gt;</span>setIcon(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="type"><a href="qpixmap.html">QPixmap</a></span>(<span class="string">&quot;:/fileprint.png&quot;</span>)));
<span class="type"><a href="qbuttongroup.html">QButtonGroup</a></span> <span class="operator">*</span>pointerModeGroup <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qbuttongroup.html">QButtonGroup</a></span>;
pointerModeGroup<span class="operator">-</span><span class="operator">&gt;</span>setExclusive(<span class="keyword">true</span>);
pointerModeGroup<span class="operator">-</span><span class="operator">&gt;</span>addButton(selectModeButton);
pointerModeGroup<span class="operator">-</span><span class="operator">&gt;</span>addButton(dragModeButton);
labelLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(label);
labelLayout<span class="operator">-</span><span class="operator">&gt;</span>addStretch();
labelLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(label2);
labelLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(selectModeButton);
labelLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(dragModeButton);
labelLayout<span class="operator">-</span><span class="operator">&gt;</span>addStretch();
labelLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(antialiasButton);
labelLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(openGlButton);
labelLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(printButton);
<span class="type"><a href="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>topLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;
topLayout<span class="operator">-</span><span class="operator">&gt;</span>addLayout(labelLayout<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
topLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(graphicsView<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span>);
topLayout<span class="operator">-</span><span class="operator">&gt;</span>addLayout(zoomSliderLayout<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
topLayout<span class="operator">-</span><span class="operator">&gt;</span>addLayout(rotateSliderLayout<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">0</span>);
topLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(resetButton<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">1</span>);
setLayout(topLayout);
connect(resetButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(resetView()));
connect(zoomSlider<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(setupMatrix()));
connect(rotateSlider<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(setupMatrix()));
connect(graphicsView<span class="operator">-</span><span class="operator">&gt;</span>verticalScrollBar()<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(setResetButtonEnabled()));
connect(graphicsView<span class="operator">-</span><span class="operator">&gt;</span>horizontalScrollBar()<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(setResetButtonEnabled()));
connect(selectModeButton<span class="operator">,</span> SIGNAL(toggled(<span class="type">bool</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(togglePointerMode()));
connect(dragModeButton<span class="operator">,</span> SIGNAL(toggled(<span class="type">bool</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(togglePointerMode()));
connect(antialiasButton<span class="operator">,</span> SIGNAL(toggled(<span class="type">bool</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(toggleAntialiasing()));
connect(openGlButton<span class="operator">,</span> SIGNAL(toggled(<span class="type">bool</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(toggleOpenGL()));
connect(rotateLeftIcon<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(rotateLeft()));
connect(rotateRightIcon<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(rotateRight()));
connect(zoomInIcon<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(zoomIn()));
connect(zoomOutIcon<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(zoomOut()));
connect(printButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(print()));
setupMatrix();
}
<span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span> <span class="operator">*</span>View<span class="operator">::</span>view() <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span><span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span> <span class="operator">*</span><span class="operator">&gt;</span>(graphicsView);
}
<span class="type">void</span> View<span class="operator">::</span>resetView()
{
zoomSlider<span class="operator">-</span><span class="operator">&gt;</span>setValue(<span class="number">250</span>);
rotateSlider<span class="operator">-</span><span class="operator">&gt;</span>setValue(<span class="number">0</span>);
setupMatrix();
graphicsView<span class="operator">-</span><span class="operator">&gt;</span>ensureVisible(<span class="type"><a href="qrectf.html">QRectF</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>));
resetButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
}
<span class="type">void</span> View<span class="operator">::</span>setResetButtonEnabled()
{
resetButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">true</span>);
}
<span class="type">void</span> View<span class="operator">::</span>setupMatrix()
{
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> scale <span class="operator">=</span> <a href="qtcore-qmath-h.html#qPow">qPow</a>(<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(<span class="number">2</span>)<span class="operator">,</span> (zoomSlider<span class="operator">-</span><span class="operator">&gt;</span>value() <span class="operator">-</span> <span class="number">250</span>) <span class="operator">/</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span>(<span class="number">50</span>));
<span class="type"><a href="qmatrix.html">QMatrix</a></span> matrix;
matrix<span class="operator">.</span>scale(scale<span class="operator">,</span> scale);
matrix<span class="operator">.</span>rotate(rotateSlider<span class="operator">-</span><span class="operator">&gt;</span>value());
graphicsView<span class="operator">-</span><span class="operator">&gt;</span>setMatrix(matrix);
setResetButtonEnabled();
}
<span class="type">void</span> View<span class="operator">::</span>togglePointerMode()
{
graphicsView<span class="operator">-</span><span class="operator">&gt;</span>setDragMode(selectModeButton<span class="operator">-</span><span class="operator">&gt;</span>isChecked()
<span class="operator">?</span> <span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>RubberBandDrag
: <span class="type"><a href="qgraphicsview.html">QGraphicsView</a></span><span class="operator">::</span>ScrollHandDrag);
graphicsView<span class="operator">-</span><span class="operator">&gt;</span>setInteractive(selectModeButton<span class="operator">-</span><span class="operator">&gt;</span>isChecked());
}
<span class="type">void</span> View<span class="operator">::</span>toggleOpenGL()
{
<span class="preprocessor">#ifndef QT_NO_OPENGL</span>
graphicsView<span class="operator">-</span><span class="operator">&gt;</span>setViewport(openGlButton<span class="operator">-</span><span class="operator">&gt;</span>isChecked() <span class="operator">?</span> <span class="keyword">new</span> <span class="type"><a href="qglwidget.html">QGLWidget</a></span>(<span class="type"><a href="qglformat.html">QGLFormat</a></span>(QGL<span class="operator">::</span>SampleBuffers)) : <span class="keyword">new</span> <span class="type"><a href="qwidget.html">QWidget</a></span>);
<span class="preprocessor">#endif</span>
}
<span class="type">void</span> View<span class="operator">::</span>toggleAntialiasing()
{
graphicsView<span class="operator">-</span><span class="operator">&gt;</span>setRenderHint(<span class="type"><a href="qpainter.html">QPainter</a></span><span class="operator">::</span>Antialiasing<span class="operator">,</span> antialiasButton<span class="operator">-</span><span class="operator">&gt;</span>isChecked());
}
<span class="type">void</span> View<span class="operator">::</span>print()
{
<span class="preprocessor">#ifndef QT_NO_PRINTER</span>
<span class="type"><a href="qprinter.html">QPrinter</a></span> printer;
<span class="type"><a href="qprintdialog.html">QPrintDialog</a></span> dialog(<span class="operator">&amp;</span>printer<span class="operator">,</span> <span class="keyword">this</span>);
<span class="keyword">if</span> (dialog<span class="operator">.</span>exec() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qdialog.html">QDialog</a></span><span class="operator">::</span>Accepted) {
<span class="type"><a href="qpainter.html">QPainter</a></span> painter(<span class="operator">&amp;</span>printer);
graphicsView<span class="operator">-</span><span class="operator">&gt;</span>render(<span class="operator">&amp;</span>painter);
}
<span class="preprocessor">#endif</span>
}
<span class="type">void</span> View<span class="operator">::</span>zoomIn(<span class="type">int</span> level)
{
zoomSlider<span class="operator">-</span><span class="operator">&gt;</span>setValue(zoomSlider<span class="operator">-</span><span class="operator">&gt;</span>value() <span class="operator">+</span> level);
}
<span class="type">void</span> View<span class="operator">::</span>zoomOut(<span class="type">int</span> level)
{
zoomSlider<span class="operator">-</span><span class="operator">&gt;</span>setValue(zoomSlider<span class="operator">-</span><span class="operator">&gt;</span>value() <span class="operator">-</span> level);
}
<span class="type">void</span> View<span class="operator">::</span>rotateLeft()
{
rotateSlider<span class="operator">-</span><span class="operator">&gt;</span>setValue(rotateSlider<span class="operator">-</span><span class="operator">&gt;</span>value() <span class="operator">-</span> <span class="number">10</span>);
}
<span class="type">void</span> View<span class="operator">::</span>rotateRight()
{
rotateSlider<span class="operator">-</span><span class="operator">&gt;</span>setValue(rotateSlider<span class="operator">-</span><span class="operator">&gt;</span>value() <span class="operator">+</span> <span class="number">10</span>);
}</pre>
</div>
<!-- @@@demos/chip/view.cpp -->
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