chart.cpp
110 lines
| 3.7 KiB
| text/x-c
|
CppLexer
Miikka Heikkinen
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r2854 | /**************************************************************************** | ||
Tero Ahola
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r1790 | ** | ||
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Miikka Heikkinen
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r2854 | ** Copyright (C) 2016 The Qt Company Ltd. | ||
| ** Contact: https://www.qt.io/licensing/ | ||||
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Tero Ahola
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r1790 | ** | ||
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Miikka Heikkinen
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r2854 | ** This file is part of the Qt Charts module of the Qt Toolkit. | ||
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Tero Ahola
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r1790 | ** | ||
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Miikka Heikkinen
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r2854 | ** $QT_BEGIN_LICENSE:GPL$ | ||
Titta Heikkala
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r2845 | ** 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 | ||||
|
Miikka Heikkinen
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r2854 | ** 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. | ||||
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Tero Ahola
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r1790 | ** | ||
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Titta Heikkala
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r2845 | ** $QT_END_LICENSE$ | ||
| ** | ||||
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Miikka Heikkinen
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r2854 | ****************************************************************************/ | ||
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Tero Ahola
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r1790 | |||
Jani Honkonen
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r1949 | #include "chart.h" | ||
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Titta Heikkala
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r2714 | #include <QtCharts/QValueAxis> | ||
| #include <QtCharts/QAbstractAxis> | ||||
| #include <QtCore/QtMath> | ||||
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Tero Ahola
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r1790 | |||
| Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags, QLineSeries *series) | ||||
Miikka Heikkinen
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r2483 | : QChart(QChart::ChartTypeCartesian, parent, wFlags), m_series(series) | ||
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Tero Ahola
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r1790 | { | ||
| m_clicked = false; | ||||
| } | ||||
| Chart::~Chart() | ||||
| { | ||||
| } | ||||
| void Chart::clickPoint(const QPointF &point) | ||||
| { | ||||
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Tero Ahola
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r1791 | // 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)) { | ||||
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Tero Ahola
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r1790 | m_movingPoint = p; | ||
| m_clicked = true; | ||||
| } | ||||
| } | ||||
| } | ||||
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Tero Ahola
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r1791 | qreal Chart::distance(const QPointF &p1, const QPointF &p2) | ||
| { | ||||
Titta Heikkala
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r2613 | return qSqrt((p1.x() - p2.x()) * (p1.x() - p2.x()) | ||
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Tero Ahola
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r1791 | + (p1.y() - p2.y()) * (p1.y() - p2.y())); | ||
| } | ||||
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Tero Ahola
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r1790 | void Chart::setPointClicked(bool clicked) | ||
| { | ||||
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Jani Honkonen
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r2099 | m_clicked = clicked; | ||
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Tero Ahola
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r1790 | } | ||
| 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; | ||||
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Jani Honkonen
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r2099 | mappedPoint.setX(point.x() - this->plotArea().x()); | ||
| mappedPoint.setY(point.y() - this->plotArea().y()); | ||||
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Tero Ahola
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r1790 | |||
| //Get the x- and y axis to be able to convert the mapped | ||||
| //coordinate point to the charts scale. | ||||
|
Jani Honkonen
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r2099 | QAbstractAxis *axisx = this->axisX(); | ||
| QValueAxis *haxis = 0; | ||||
Marek Rosa
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r1818 | if (axisx->type() == QAbstractAxis::AxisTypeValue) | ||
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Jani Honkonen
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r2099 | haxis = qobject_cast<QValueAxis *>(axisx); | ||
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Tero Ahola
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r1790 | |||
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Jani Honkonen
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r2099 | QAbstractAxis *axisy = this->axisY(); | ||
| QValueAxis *vaxis = 0; | ||||
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Marek Rosa
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r1818 | if (axisy->type() == QAbstractAxis::AxisTypeValue) | ||
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Jani Honkonen
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r2099 | vaxis = qobject_cast<QValueAxis *>(axisy); | ||
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Tero Ahola
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r1790 | |||
| if (haxis && vaxis) { | ||||
| //Calculate the "unit" between points on the x | ||||
| //y axis. | ||||
|
Jani Honkonen
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r2099 | double xUnit = this->plotArea().width() / haxis->max(); | ||
| double yUnit = this->plotArea().height() / vaxis->max(); | ||||
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Tero Ahola
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r1790 | |||
| //Convert the mappedPoint to the actual chart scale. | ||||
|
Jani Honkonen
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r2099 | double x = mappedPoint.x() / xUnit; | ||
| double y = vaxis->max() - mappedPoint.y() / yUnit; | ||||
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Tero Ahola
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r1790 | |||
| //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); | ||||
| } | ||||
| } | ||||
| } | ||||