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/****************************************************************************
**
** 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 "chart.h"
#include <QtCharts/QValueAxis>
#include <QtCharts/QAbstractAxis>
#include <QtCore/QtMath>
Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags, QLineSeries *series)
: QChart(QChart::ChartTypeCartesian, parent, wFlags), m_series(series)
{
m_clicked = false;
}
Chart::~Chart()
{
}
void Chart::clickPoint(const QPointF &point)
{
// Find the closes data point
m_movingPoint = QPoint();
m_clicked = false;
foreach (QPointF p, m_series->points()) {
if (distance(p, point) < distance(m_movingPoint, point)) {
m_movingPoint = p;
m_clicked = true;
}
}
}
qreal Chart::distance(const QPointF &p1, const QPointF &p2)
{
return qSqrt((p1.x() - p2.x()) * (p1.x() - p2.x())
+ (p1.y() - p2.y()) * (p1.y() - p2.y()));
}
void Chart::setPointClicked(bool clicked)
{
m_clicked = clicked;
}
void Chart::handlePointMove(const QPoint &point)
{
if (m_clicked) {
//Map the point clicked from the ChartView
//to the area occupied by the chart.
QPoint mappedPoint = point;
mappedPoint.setX(point.x() - this->plotArea().x());
mappedPoint.setY(point.y() - this->plotArea().y());
//Get the x- and y axis to be able to convert the mapped
//coordinate point to the charts scale.
QAbstractAxis *axisx = this->axisX();
QValueAxis *haxis = 0;
if (axisx->type() == QAbstractAxis::AxisTypeValue)
haxis = qobject_cast<QValueAxis *>(axisx);
QAbstractAxis *axisy = this->axisY();
QValueAxis *vaxis = 0;
if (axisy->type() == QAbstractAxis::AxisTypeValue)
vaxis = qobject_cast<QValueAxis *>(axisy);
if (haxis && vaxis) {
//Calculate the "unit" between points on the x
//y axis.
double xUnit = this->plotArea().width() / haxis->max();
double yUnit = this->plotArea().height() / vaxis->max();
//Convert the mappedPoint to the actual chart scale.
double x = mappedPoint.x() / xUnit;
double y = vaxis->max() - mappedPoint.y() / yUnit;
//Replace the old point with the new one.
m_series->replace(m_movingPoint, QPointF(x, y));
//Update the m_movingPoint so we are able to
//do the replace also during mousemoveEvent.
m_movingPoint.setX(x);
m_movingPoint.setY(y);
}
}
}
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