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++ // Copyright (C) 2023 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include "interactionschart.h"
++
++ #include <QLineSeries>
++ #include <QtMath>
++ #include <QValueAxis>
++
++ InteractionsChart::InteractionsChart(QGraphicsItem *parent, Qt::WindowFlags wFlags, QLineSeries *series)
++ : QChart(QChart::ChartTypeCartesian, parent, wFlags), m_series(series)
++ {
++ }
++
++ void InteractionsChart::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 InteractionsChart::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 InteractionsChart::setPointClicked(bool clicked)
++ {
++ m_clicked = clicked;
++ }
++
++ void InteractionsChart::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 chart scale
++ QAbstractAxis *axisx = axes(Qt::Horizontal).first();
++ QValueAxis *haxis = nullptr;
++ if (axisx->type() == QAbstractAxis::AxisTypeValue)
++ haxis = qobject_cast<QValueAxis *>(axisx);
++
++ QAbstractAxis *axisy = axes(Qt::Vertical).first();
++ QValueAxis *vaxis = nullptr;
++ 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);
++ }
++ }
++ }
++