chart.cpp
103 lines
| 3.1 KiB
| text/x-c
|
CppLexer
|
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 | ||||
** $QT_END_LICENSE$ | ||||
** | ||||
****************************************************************************/ | ||||
|
r1804 | #include <QValueAxis> | ||
|
r1790 | #include <QAbstractAxis> | ||
|
r1791 | #include <cmath> | ||
|
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) | ||||
{ | ||||
|
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)) { | ||||
|
r1790 | m_movingPoint = p; | ||
m_clicked = true; | ||||
} | ||||
} | ||||
} | ||||
|
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())); | ||||
} | ||||
|
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(); | ||||
|
r1804 | QValueAxis* haxis = 0; | ||
|
r1818 | if (axisx->type() == QAbstractAxis::AxisTypeValue) | ||
|
r1804 | haxis = qobject_cast<QValueAxis*>(axisx); | ||
|
r1790 | |||
QAbstractAxis * axisy = this->axisY(); | ||||
|
r1804 | QValueAxis* vaxis = 0; | ||
|
r1818 | if (axisy->type() == QAbstractAxis::AxisTypeValue) | ||
|
r1804 | vaxis = qobject_cast<QValueAxis*>(axisy); | ||
|
r1790 | |||
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); | ||||
} | ||||
} | ||||
} | ||||