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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#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);
}
}
}
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