chart.cpp
103 lines
| 3.1 KiB
| text/x-c
|
CppLexer
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r1790 | /**************************************************************************** | ||
| ** | ||||
| ** Copyright (C) 2012 Digia Plc | ||||
| ** 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 | ||||
| ** $QT_END_LICENSE$ | ||||
| ** | ||||
| ****************************************************************************/ | ||||
| #include <QValuesAxis> | ||||
| #include <QAbstractAxis> | ||||
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r1791 | #include <cmath> | ||
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r1790 | #include <QDebug> | ||
| #include "chart.h" | ||||
| Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags, QLineSeries *series) | ||||
| : QChart(parent, wFlags), m_series(series) | ||||
| { | ||||
| 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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r1790 | 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(); | ||||
| QValuesAxis* haxis = 0; | ||||
| if (axisx->type() == QAbstractAxis::AxisTypeValues) | ||||
| haxis = qobject_cast<QValuesAxis*>(axisx); | ||||
| QAbstractAxis * axisy = this->axisY(); | ||||
| QValuesAxis* vaxis = 0; | ||||
| if (axisy->type() == QAbstractAxis::AxisTypeValues) | ||||
| vaxis = qobject_cast<QValuesAxis*>(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); | ||||
| } | ||||
| } | ||||
| } | ||||