chart.cpp
101 lines
| 3.2 KiB
| text/x-c
|
CppLexer
Tero Ahola
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r1790 | /**************************************************************************** | ||
** | ||||
Titta Heikkala
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r2688 | ** Copyright (C) 2014 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 | ||||
** | ||||
Miikka Heikkinen
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r2574 | ** This file is part of the Qt Enterprise Charts Add-on. | ||
Tero Ahola
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r1790 | ** | ||
** $QT_BEGIN_LICENSE$ | ||||
Miikka Heikkinen
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r2574 | ** Licensees holding valid Qt Enterprise licenses may use this file in | ||
** accordance with the Qt Enterprise License Agreement provided with the | ||||
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r1790 | ** 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" | ||
Titta Heikkala
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r2714 | #include <QtCharts/QValueAxis> | ||
#include <QtCharts/QAbstractAxis> | ||||
#include <QtCore/QtMath> | ||||
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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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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) | ||
{ | ||||
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r2613 | return qSqrt((p1.x() - p2.x()) * (p1.x() - p2.x()) | ||
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r1791 | + (p1.y() - p2.y()) * (p1.y() - p2.y())); | ||
} | ||||
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r1790 | void Chart::setPointClicked(bool clicked) | ||
{ | ||||
Jani Honkonen
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r2099 | m_clicked = clicked; | ||
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()); | ||||
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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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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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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; | ||||
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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); | ||||
} | ||||
} | ||||
} | ||||