1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the Qt Charts module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:GPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU
19** General Public License version 3 or (at your option) any later version
20** approved by the KDE Free Qt Foundation. The licenses are as published by
21** the Free Software Foundation and appearing in the file LICENSE.GPL3
22** included in the packaging of this file. Please review the following
23** information to ensure the GNU General Public License requirements will
24** be met: https://www.gnu.org/licenses/gpl-3.0.html.
25**
26** $QT_END_LICENSE$
27**
28****************************************************************************/
29
30#include "chartview.h"
31#include <QtCore/QtMath>
32#include <QtCore/QDebug>
33
34QT_CHARTS_USE_NAMESPACE
35
36ChartView::ChartView(QWidget *parent)
37 : QChartView(new QChart(), parent),
38 m_scatter(0),
39 m_scatter2(0)
40{
41 setRenderHint(hint: QPainter::Antialiasing);
42
43 chart()->setTitle("Click to interact with scatter points");
44
45 m_scatter = new QScatterSeries();
46 m_scatter->setName("scatter1");
47 for (qreal x(0.5); x <= 4.0; x += 0.5) {
48 for (qreal y(0.5); y <= 4.0; y += 0.5)
49 *m_scatter << QPointF(x, y);
50 }
51 m_scatter2 = new QScatterSeries();
52 m_scatter2->setName("scatter2");
53
54 chart()->addSeries(series: m_scatter2);
55 chart()->addSeries(series: m_scatter);
56 chart()->createDefaultAxes();
57 chart()->axes(orientation: Qt::Horizontal).first()->setRange(min: 0, max: 4.5);
58 chart()->axes(orientation: Qt::Vertical).first()->setRange(min: 0, max: 4.5);
59
60 connect(sender: m_scatter, signal: &QScatterSeries::clicked, receiver: this, slot: &ChartView::handleClickedPoint);
61}
62
63ChartView::~ChartView()
64{
65}
66
67void ChartView::handleClickedPoint(const QPointF &point)
68{
69 QPointF clickedPoint = point;
70 // Find the closest point from series 1
71 QPointF closest(INT_MAX, INT_MAX);
72 qreal distance(INT_MAX);
73 const auto points = m_scatter->points();
74 for (const QPointF &currentPoint : points) {
75 qreal currentDistance = qSqrt(v: (currentPoint.x() - clickedPoint.x())
76 * (currentPoint.x() - clickedPoint.x())
77 + (currentPoint.y() - clickedPoint.y())
78 * (currentPoint.y() - clickedPoint.y()));
79 if (currentDistance < distance) {
80 distance = currentDistance;
81 closest = currentPoint;
82 }
83 }
84
85 // Remove the closes point from series 1 and append it to series 2
86 m_scatter->remove(point: closest);
87 m_scatter2->append(point: closest);
88}
89

source code of qtcharts/examples/charts/scatterinteractions/chartview.cpp