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<h1 class="title">callout.cpp Example File</h1>
<span class="subtitle">callout/callout.cpp</span>
<!-- $$$callout/callout.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Charts module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "callout.h"</span>
<span class="preprocessor">#include <QtGui/QPainter></span>
<span class="preprocessor">#include <QtGui/QFontMetrics></span>
<span class="preprocessor">#include <QtWidgets/QGraphicsSceneMouseEvent></span>
<span class="preprocessor">#include <QtGui/QMouseEvent></span>
<span class="preprocessor">#include <QtCharts/QChart></span>
Callout<span class="operator">::</span>Callout(<span class="type"><a href="qchart.html">QChart</a></span> <span class="operator">*</span>chart):
<span class="type">QGraphicsItem</span>(chart)<span class="operator">,</span>
m_chart(chart)
{
}
<span class="type">QRectF</span> Callout<span class="operator">::</span>boundingRect() <span class="keyword">const</span>
{
<span class="type">QPointF</span> anchor <span class="operator">=</span> mapFromParent(m_chart<span class="operator">-</span><span class="operator">></span>mapToPosition(m_anchor));
<span class="type">QRectF</span> rect;
rect<span class="operator">.</span>setLeft(qMin(m_rect<span class="operator">.</span>left()<span class="operator">,</span> anchor<span class="operator">.</span>x()));
rect<span class="operator">.</span>setRight(qMax(m_rect<span class="operator">.</span>right()<span class="operator">,</span> anchor<span class="operator">.</span>x()));
rect<span class="operator">.</span>setTop(qMin(m_rect<span class="operator">.</span>top()<span class="operator">,</span> anchor<span class="operator">.</span>y()));
rect<span class="operator">.</span>setBottom(qMax(m_rect<span class="operator">.</span>bottom()<span class="operator">,</span> anchor<span class="operator">.</span>y()));
<span class="keyword">return</span> rect;
}
<span class="type">void</span> Callout<span class="operator">::</span>paint(<span class="type">QPainter</span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QStyleOptionGraphicsItem</span> <span class="operator">*</span>option<span class="operator">,</span> <span class="type">QWidget</span> <span class="operator">*</span>widget)
{
Q_UNUSED(option)
Q_UNUSED(widget)
<span class="type">QPainterPath</span> path;
path<span class="operator">.</span>addRoundedRect(m_rect<span class="operator">,</span> <span class="number">5</span><span class="operator">,</span> <span class="number">5</span>);
<span class="type">QPointF</span> anchor <span class="operator">=</span> mapFromParent(m_chart<span class="operator">-</span><span class="operator">></span>mapToPosition(m_anchor));
<span class="keyword">if</span> (<span class="operator">!</span>m_rect<span class="operator">.</span>contains(anchor)) {
<span class="type">QPointF</span> point1<span class="operator">,</span> point2;
<span class="comment">// establish the position of the anchor point in relation to m_rect</span>
bool above <span class="operator">=</span> anchor<span class="operator">.</span>y() <span class="operator"><</span><span class="operator">=</span> m_rect<span class="operator">.</span>top();
bool aboveCenter <span class="operator">=</span> anchor<span class="operator">.</span>y() <span class="operator">></span> m_rect<span class="operator">.</span>top() <span class="operator">&</span><span class="operator">&</span> anchor<span class="operator">.</span>y() <span class="operator"><</span><span class="operator">=</span> m_rect<span class="operator">.</span>center()<span class="operator">.</span>y();
bool belowCenter <span class="operator">=</span> anchor<span class="operator">.</span>y() <span class="operator">></span> m_rect<span class="operator">.</span>center()<span class="operator">.</span>y() <span class="operator">&</span><span class="operator">&</span> anchor<span class="operator">.</span>y() <span class="operator"><</span><span class="operator">=</span> m_rect<span class="operator">.</span>bottom();
bool below <span class="operator">=</span> anchor<span class="operator">.</span>y() <span class="operator">></span> m_rect<span class="operator">.</span>bottom();
bool onLeft <span class="operator">=</span> anchor<span class="operator">.</span>x() <span class="operator"><</span><span class="operator">=</span> m_rect<span class="operator">.</span>left();
bool leftOfCenter <span class="operator">=</span> anchor<span class="operator">.</span>x() <span class="operator">></span> m_rect<span class="operator">.</span>left() <span class="operator">&</span><span class="operator">&</span> anchor<span class="operator">.</span>x() <span class="operator"><</span><span class="operator">=</span> m_rect<span class="operator">.</span>center()<span class="operator">.</span>x();
bool rightOfCenter <span class="operator">=</span> anchor<span class="operator">.</span>x() <span class="operator">></span> m_rect<span class="operator">.</span>center()<span class="operator">.</span>x() <span class="operator">&</span><span class="operator">&</span> anchor<span class="operator">.</span>x() <span class="operator"><</span><span class="operator">=</span> m_rect<span class="operator">.</span>right();
bool onRight <span class="operator">=</span> anchor<span class="operator">.</span>x() <span class="operator">></span> m_rect<span class="operator">.</span>right();
<span class="comment">// get the nearest m_rect corner.</span>
<span class="type">qreal</span> x <span class="operator">=</span> (onRight <span class="operator">+</span> rightOfCenter) <span class="operator">*</span> m_rect<span class="operator">.</span>width();
<span class="type">qreal</span> y <span class="operator">=</span> (below <span class="operator">+</span> belowCenter) <span class="operator">*</span> m_rect<span class="operator">.</span>height();
bool cornerCase <span class="operator">=</span> (above <span class="operator">&</span><span class="operator">&</span> onLeft) <span class="operator">|</span><span class="operator">|</span> (above <span class="operator">&</span><span class="operator">&</span> onRight) <span class="operator">|</span><span class="operator">|</span> (below <span class="operator">&</span><span class="operator">&</span> onLeft) <span class="operator">|</span><span class="operator">|</span> (below <span class="operator">&</span><span class="operator">&</span> onRight);
bool vertical <span class="operator">=</span> qAbs(anchor<span class="operator">.</span>x() <span class="operator">-</span> x) <span class="operator">></span> qAbs(anchor<span class="operator">.</span>y() <span class="operator">-</span> y);
<span class="type">qreal</span> x1 <span class="operator">=</span> x <span class="operator">+</span> leftOfCenter <span class="operator">*</span> <span class="number">10</span> <span class="operator">-</span> rightOfCenter <span class="operator">*</span> <span class="number">20</span> <span class="operator">+</span> cornerCase <span class="operator">*</span> <span class="operator">!</span>vertical <span class="operator">*</span> (onLeft <span class="operator">*</span> <span class="number">10</span> <span class="operator">-</span> onRight <span class="operator">*</span> <span class="number">20</span>);
<span class="type">qreal</span> y1 <span class="operator">=</span> y <span class="operator">+</span> aboveCenter <span class="operator">*</span> <span class="number">10</span> <span class="operator">-</span> belowCenter <span class="operator">*</span> <span class="number">20</span> <span class="operator">+</span> cornerCase <span class="operator">*</span> vertical <span class="operator">*</span> (above <span class="operator">*</span> <span class="number">10</span> <span class="operator">-</span> below <span class="operator">*</span> <span class="number">20</span>);;
point1<span class="operator">.</span>setX(x1);
point1<span class="operator">.</span>setY(y1);
<span class="type">qreal</span> x2 <span class="operator">=</span> x <span class="operator">+</span> leftOfCenter <span class="operator">*</span> <span class="number">20</span> <span class="operator">-</span> rightOfCenter <span class="operator">*</span> <span class="number">10</span> <span class="operator">+</span> cornerCase <span class="operator">*</span> <span class="operator">!</span>vertical <span class="operator">*</span> (onLeft <span class="operator">*</span> <span class="number">20</span> <span class="operator">-</span> onRight <span class="operator">*</span> <span class="number">10</span>);;
<span class="type">qreal</span> y2 <span class="operator">=</span> y <span class="operator">+</span> aboveCenter <span class="operator">*</span> <span class="number">20</span> <span class="operator">-</span> belowCenter <span class="operator">*</span> <span class="number">10</span> <span class="operator">+</span> cornerCase <span class="operator">*</span> vertical <span class="operator">*</span> (above <span class="operator">*</span> <span class="number">20</span> <span class="operator">-</span> below <span class="operator">*</span> <span class="number">10</span>);;
point2<span class="operator">.</span>setX(x2);
point2<span class="operator">.</span>setY(y2);
path<span class="operator">.</span>moveTo(point1);
path<span class="operator">.</span>lineTo(anchor);
path<span class="operator">.</span>lineTo(point2);
path <span class="operator">=</span> path<span class="operator">.</span>simplified();
}
painter<span class="operator">-</span><span class="operator">></span>setBrush(<span class="type">QColor</span>(<span class="number">255</span><span class="operator">,</span> <span class="number">255</span><span class="operator">,</span> <span class="number">255</span>));
painter<span class="operator">-</span><span class="operator">></span>drawPath(path);
painter<span class="operator">-</span><span class="operator">></span>drawText(m_textRect<span class="operator">,</span> m_text);
}
<span class="type">void</span> Callout<span class="operator">::</span>mousePressEvent(<span class="type">QGraphicsSceneMouseEvent</span> <span class="operator">*</span>event)
{
event<span class="operator">-</span><span class="operator">></span>setAccepted(<span class="keyword">true</span>);
}
<span class="type">void</span> Callout<span class="operator">::</span>mouseMoveEvent(<span class="type">QGraphicsSceneMouseEvent</span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>buttons() <span class="operator">&</span> <span class="type">Qt</span><span class="operator">::</span>LeftButton){
setPos(mapToParent(event<span class="operator">-</span><span class="operator">></span>pos() <span class="operator">-</span> event<span class="operator">-</span><span class="operator">></span>buttonDownPos(<span class="type">Qt</span><span class="operator">::</span>LeftButton)));
event<span class="operator">-</span><span class="operator">></span>setAccepted(<span class="keyword">true</span>);
} <span class="keyword">else</span> {
event<span class="operator">-</span><span class="operator">></span>setAccepted(<span class="keyword">false</span>);
}
}
<span class="type">void</span> Callout<span class="operator">::</span>setText(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>text)
{
m_text <span class="operator">=</span> text;
<span class="type">QFontMetrics</span> metrics(m_font);
m_textRect <span class="operator">=</span> metrics<span class="operator">.</span>boundingRect(<span class="type">QRect</span>(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">150</span><span class="operator">,</span> <span class="number">150</span>)<span class="operator">,</span> <span class="type">Qt</span><span class="operator">::</span>AlignLeft<span class="operator">,</span> m_text);
m_textRect<span class="operator">.</span>translate(<span class="number">5</span><span class="operator">,</span> <span class="number">5</span>);
prepareGeometryChange();
m_rect <span class="operator">=</span> m_textRect<span class="operator">.</span>adjusted(<span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="operator">-</span><span class="number">5</span><span class="operator">,</span> <span class="number">5</span><span class="operator">,</span> <span class="number">5</span>);
}
<span class="type">void</span> Callout<span class="operator">::</span>setAnchor(<span class="type">QPointF</span> point)
{
m_anchor <span class="operator">=</span> point;
}
<span class="type">void</span> Callout<span class="operator">::</span>updateGeometry()
{
prepareGeometryChange();
setPos(m_chart<span class="operator">-</span><span class="operator">></span>mapToPosition(m_anchor) <span class="operator">+</span> <span class="type">QPoint</span>(<span class="number">10</span><span class="operator">,</span> <span class="operator">-</span><span class="number">50</span>));
}
</pre>
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<!-- @@@callout/callout.cpp -->
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