chartview.cpp
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r0 | /**************************************************************************** | ||
** | ||||
** 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. | ||||
** | ||||
** $QT_END_LICENSE$ | ||||
** | ||||
****************************************************************************/ | ||||
#include "chartview.h" | ||||
#include <QtCore/QtMath> | ||||
#include <QtCore/QDebug> | ||||
QT_CHARTS_USE_NAMESPACE | ||||
ChartView::ChartView(QWidget *parent) | ||||
: QChartView(new QChart(), parent), | ||||
m_scatter(0), | ||||
m_scatter2(0) | ||||
{ | ||||
setRenderHint(QPainter::Antialiasing); | ||||
chart()->setTitle("Click to interact with scatter points"); | ||||
m_scatter = new QScatterSeries(); | ||||
m_scatter->setName("scatter1"); | ||||
for (qreal x(0.5); x <= 4.0; x += 0.5) { | ||||
for (qreal y(0.5); y <= 4.0; y += 0.5) { | ||||
*m_scatter << QPointF(x, y); | ||||
} | ||||
} | ||||
m_scatter2 = new QScatterSeries(); | ||||
m_scatter2->setName("scatter2"); | ||||
chart()->addSeries(m_scatter2); | ||||
chart()->addSeries(m_scatter); | ||||
chart()->createDefaultAxes(); | ||||
chart()->axisX()->setRange(0, 4.5); | ||||
chart()->axisY()->setRange(0, 4.5); | ||||
connect(m_scatter, SIGNAL(clicked(QPointF)), this, SLOT(handleClickedPoint(QPointF))); | ||||
} | ||||
ChartView::~ChartView() | ||||
{ | ||||
} | ||||
void ChartView::handleClickedPoint(const QPointF &point) | ||||
{ | ||||
QPointF clickedPoint = point; | ||||
// Find the closest point from series 1 | ||||
QPointF closest(INT_MAX, INT_MAX); | ||||
qreal distance(INT_MAX); | ||||
foreach (QPointF currentPoint, m_scatter->points()) { | ||||
qreal currentDistance = qSqrt((currentPoint.x() - clickedPoint.x()) | ||||
* (currentPoint.x() - clickedPoint.x()) | ||||
+ (currentPoint.y() - clickedPoint.y()) | ||||
* (currentPoint.y() - clickedPoint.y())); | ||||
if (currentDistance < distance) { | ||||
distance = currentDistance; | ||||
closest = currentPoint; | ||||
} | ||||
} | ||||
// Remove the closes point from series 1 and append it to series 2 | ||||
m_scatter->remove(closest); | ||||
m_scatter2->append(closest); | ||||
} | ||||