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/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.digia.com
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**
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** This file is part of the Qt Commercial Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.digia.com
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "chart.h"
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#include <QValueAxis>
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#include <QAbstractAxis>
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#include <cmath>
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Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags, QLineSeries *series)
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: QChart(QChart::ChartTypeCartesian, parent, wFlags), m_series(series)
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{
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m_clicked = false;
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}
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Chart::~Chart()
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{
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}
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void Chart::clickPoint(const QPointF &point)
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{
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// Find the closes data point
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m_movingPoint = QPoint();
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m_clicked = false;
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foreach (QPointF p, m_series->points()) {
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if (distance(p, point) < distance(m_movingPoint, point)) {
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m_movingPoint = p;
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m_clicked = true;
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}
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}
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}
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qreal Chart::distance(const QPointF &p1, const QPointF &p2)
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{
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return sqrt((p1.x() - p2.x()) * (p1.x() - p2.x())
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+ (p1.y() - p2.y()) * (p1.y() - p2.y()));
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}
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void Chart::setPointClicked(bool clicked)
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{
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m_clicked = clicked;
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}
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void Chart::handlePointMove(const QPoint &point)
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{
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if (m_clicked) {
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//Map the point clicked from the ChartView
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//to the area occupied by the chart.
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QPoint mappedPoint = point;
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mappedPoint.setX(point.x() - this->plotArea().x());
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mappedPoint.setY(point.y() - this->plotArea().y());
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//Get the x- and y axis to be able to convert the mapped
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//coordinate point to the charts scale.
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QAbstractAxis *axisx = this->axisX();
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QValueAxis *haxis = 0;
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if (axisx->type() == QAbstractAxis::AxisTypeValue)
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haxis = qobject_cast<QValueAxis *>(axisx);
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QAbstractAxis *axisy = this->axisY();
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QValueAxis *vaxis = 0;
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if (axisy->type() == QAbstractAxis::AxisTypeValue)
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vaxis = qobject_cast<QValueAxis *>(axisy);
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if (haxis && vaxis) {
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//Calculate the "unit" between points on the x
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//y axis.
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double xUnit = this->plotArea().width() / haxis->max();
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double yUnit = this->plotArea().height() / vaxis->max();
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//Convert the mappedPoint to the actual chart scale.
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double x = mappedPoint.x() / xUnit;
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double y = vaxis->max() - mappedPoint.y() / yUnit;
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//Replace the old point with the new one.
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m_series->replace(m_movingPoint, QPointF(x, y));
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//Update the m_movingPoint so we are able to
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//do the replace also during mousemoveEvent.
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m_movingPoint.setX(x);
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m_movingPoint.setY(y);
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}
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}
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}
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