chart.cpp
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| 3.7 KiB
| text/x-c
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CppLexer
winter
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r0 | /**************************************************************************** | ||
** | ||||
** 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); | ||||
} | ||||
} | ||||
} | ||||