chart.cpp
101 lines
| 3.1 KiB
| text/x-c
|
CppLexer
Tero Ahola
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r1790 | /**************************************************************************** | ||
| ** | ||||
Miikka Heikkinen
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r2433 | ** Copyright (C) 2013 Digia Plc | ||
|
Tero Ahola
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r1790 | ** All rights reserved. | ||
| ** For any questions to Digia, please use contact form at http://qt.digia.com | ||||
| ** | ||||
| ** This file is part of the Qt Commercial Charts Add-on. | ||||
| ** | ||||
| ** $QT_BEGIN_LICENSE$ | ||||
| ** Licensees holding valid Qt Commercial licenses may use this file in | ||||
| ** accordance with the Qt Commercial License Agreement provided with the | ||||
| ** Software or, alternatively, in accordance with the terms contained in | ||||
| ** a written agreement between you and Digia. | ||||
| ** | ||||
| ** If you have questions regarding the use of this file, please use | ||||
| ** contact form at http://qt.digia.com | ||||
| ** $QT_END_LICENSE$ | ||||
| ** | ||||
| ****************************************************************************/ | ||||
Jani Honkonen
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r1949 | #include "chart.h" | ||
Marek Rosa
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r1804 | #include <QValueAxis> | ||
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Tero Ahola
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r1790 | #include <QAbstractAxis> | ||
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Tero Ahola
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r1791 | #include <cmath> | ||
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r1790 | |||
| Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags, QLineSeries *series) | ||||
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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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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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r1790 | m_movingPoint = p; | ||
| m_clicked = true; | ||||
| } | ||||
| } | ||||
| } | ||||
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r1791 | qreal Chart::distance(const QPointF &p1, const QPointF &p2) | ||
| { | ||||
| return sqrt((p1.x() - p2.x()) * (p1.x() - p2.x()) | ||||
| + (p1.y() - p2.y()) * (p1.y() - p2.y())); | ||||
| } | ||||
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Tero Ahola
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r1790 | void Chart::setPointClicked(bool clicked) | ||
| { | ||||
|
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; | ||||
|
Jani Honkonen
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r2099 | mappedPoint.setX(point.x() - this->plotArea().x()); | ||
| mappedPoint.setY(point.y() - this->plotArea().y()); | ||||
|
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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r1790 | |||
|
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r2099 | QAbstractAxis *axisy = this->axisY(); | ||
| QValueAxis *vaxis = 0; | ||||
|
Marek Rosa
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r1818 | if (axisy->type() == QAbstractAxis::AxisTypeValue) | ||
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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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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; | ||||
|
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); | ||||
| } | ||||
| } | ||||
| } | ||||