| /**************************************************************************** |
| ** |
| ** 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 |
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| ** 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 |
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| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #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 closest data point |
| m_movingPoint = QPoint(); |
| m_clicked = false; |
| const auto points = m_series->points(); |
| for (QPointF p : 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 = axes(Qt::Horizontal).first(); |
| QValueAxis *haxis = 0; |
| if (axisx->type() == QAbstractAxis::AxisTypeValue) |
| haxis = qobject_cast<QValueAxis *>(axisx); |
| |
| QAbstractAxis *axisy = axes(Qt::Vertical).first(); |
| 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); |
| } |
| } |
| } |
| |