|
|
/****************************************************************************
|
|
|
**
|
|
|
** 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 "qsplineseries.h"
|
|
|
#include "qsplineseries_p.h"
|
|
|
#include "splinechartitem_p.h"
|
|
|
#include "chartdataset_p.h"
|
|
|
#include "charttheme_p.h"
|
|
|
#include "chartanimator_p.h"
|
|
|
|
|
|
/*!
|
|
|
\class QSplineSeries
|
|
|
\brief Series type used to store data needed to draw a spline.
|
|
|
|
|
|
QSplineSeries stores the data points along with the segment control points needed by QPainterPath to draw spline
|
|
|
Control points are automatically calculated when data changes. The algorithm computes the points so that the normal spline can be drawn.
|
|
|
|
|
|
\image examples_splinechart.png
|
|
|
|
|
|
Creating basic spline chart is simple:
|
|
|
\code
|
|
|
QSplineSeries* series = new QSplineSeries();
|
|
|
series->append(0, 6);
|
|
|
series->append(2, 4);
|
|
|
...
|
|
|
chart->addSeries(series);
|
|
|
\endcode
|
|
|
*/
|
|
|
|
|
|
/*!
|
|
|
\fn QSeriesType QSplineSeries::type() const
|
|
|
Returns the type of the series
|
|
|
*/
|
|
|
|
|
|
QTCOMMERCIALCHART_BEGIN_NAMESPACE
|
|
|
|
|
|
/*!
|
|
|
Constructs empty series object which is a child of \a parent.
|
|
|
When series object is added to QChartView or QChart instance then the ownerships is transferred.
|
|
|
*/
|
|
|
|
|
|
QSplineSeries::QSplineSeries(QObject *parent) :
|
|
|
QLineSeries(*new QSplineSeriesPrivate(this),parent)
|
|
|
{
|
|
|
Q_D(QSplineSeries);
|
|
|
QObject::connect(this,SIGNAL(pointAdded(int)), d, SLOT(updateControlPoints()));
|
|
|
QObject::connect(this,SIGNAL(pointRemoved(int)), d, SLOT(updateControlPoints()));
|
|
|
QObject::connect(this,SIGNAL(pointReplaced(int)), d, SLOT(updateControlPoints()));
|
|
|
}
|
|
|
|
|
|
/*!
|
|
|
Destroys the object.
|
|
|
*/
|
|
|
QSplineSeries::~QSplineSeries()
|
|
|
{
|
|
|
Q_D(QSplineSeries);
|
|
|
if(d->m_dataset){
|
|
|
d->m_dataset->removeSeries(this);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
QAbstractSeries::SeriesType QSplineSeries::type() const
|
|
|
{
|
|
|
return QAbstractSeries::SeriesTypeSpline;
|
|
|
}
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
QSplineSeriesPrivate::QSplineSeriesPrivate(QSplineSeries* q):QLineSeriesPrivate(q)
|
|
|
{
|
|
|
}
|
|
|
|
|
|
/*!
|
|
|
Calculates control points which are needed by QPainterPath.cubicTo function to draw the cubic Bezier cureve between two points.
|
|
|
*/
|
|
|
void QSplineSeriesPrivate::calculateControlPoints()
|
|
|
{
|
|
|
Q_Q(QSplineSeries);
|
|
|
|
|
|
const QList<QPointF>& points = q->points();
|
|
|
|
|
|
int n = points.count() - 1;
|
|
|
|
|
|
if (n == 1)
|
|
|
{
|
|
|
//for n==1
|
|
|
m_controlPoints[0].setX((2 * points[0].x() + points[1].x()) / 3);
|
|
|
m_controlPoints[0].setY((2 * points[0].y() + points[1].y()) / 3);
|
|
|
m_controlPoints[1].setX(2 * m_controlPoints[0].x() - points[0].x());
|
|
|
m_controlPoints[1].setY(2 * m_controlPoints[0].y() - points[0].y());
|
|
|
return;
|
|
|
}
|
|
|
|
|
|
// Calculate first Bezier control points
|
|
|
// Set of equations for P0 to Pn points.
|
|
|
//
|
|
|
// | 2 1 0 0 ... 0 0 0 ... 0 0 0 | | P1_1 | | P0 + 2 * P1 |
|
|
|
// | 1 4 1 0 ... 0 0 0 ... 0 0 0 | | P1_2 | | 4 * P1 + 2 * P2 |
|
|
|
// | 0 1 4 1 ... 0 0 0 ... 0 0 0 | | P1_3 | | 4 * P2 + 2 * P3 |
|
|
|
// | . . . . . . . . . . . . | | ... | | ... |
|
|
|
// | 0 0 0 0 ... 1 4 1 ... 0 0 0 | * | P1_i | = | 4 * P(i-1) + 2 * Pi |
|
|
|
// | . . . . . . . . . . . . | | ... | | ... |
|
|
|
// | 0 0 0 0 0 0 0 0 ... 1 4 1 | | P1_(n-1)| | 4 * P(n-2) + 2 * P(n-1) |
|
|
|
// | 0 0 0 0 0 0 0 0 ... 0 2 7 | | P1_n | | 8 * P(n-1) + Pn |
|
|
|
//
|
|
|
QVector<qreal> vector;
|
|
|
vector.resize(n);
|
|
|
|
|
|
vector[0] = points[0].x() + 2 * points[1].x();
|
|
|
|
|
|
|
|
|
for (int i = 1; i < n - 1; ++i){
|
|
|
vector[i] = 4 * points[i].x() + 2 * points[i + 1].x();
|
|
|
}
|
|
|
|
|
|
vector[n - 1] = (8 * points[n-1].x() + points[n].x()) / 2.0;
|
|
|
|
|
|
QVector<qreal> xControl = firstControlPoints(vector);
|
|
|
|
|
|
vector[0] = points[0].y() + 2 * points[1].y();
|
|
|
|
|
|
for (int i = 1; i < n - 1; ++i) {
|
|
|
vector[i] = 4 * points[i].y() + 2 * points[i + 1].y();
|
|
|
}
|
|
|
|
|
|
vector[n - 1] = (8 * points[n-1].y() + points[n].y()) / 2.0;
|
|
|
|
|
|
QVector<qreal> yControl = firstControlPoints(vector);
|
|
|
|
|
|
for (int i = 0,j =0; i < n; ++i, ++j) {
|
|
|
|
|
|
m_controlPoints[j].setX(xControl[i]);
|
|
|
m_controlPoints[j].setY(yControl[i]);
|
|
|
|
|
|
j++;
|
|
|
|
|
|
if (i < n - 1){
|
|
|
m_controlPoints[j].setX(2 * points[i+1].x() - xControl[i + 1]);
|
|
|
m_controlPoints[j].setY(2 * points[i+1].y() - yControl[i + 1]);
|
|
|
}else{
|
|
|
m_controlPoints[j].setX((points[n].x() + xControl[n - 1]) / 2);
|
|
|
m_controlPoints[j].setY((points[n].y() + yControl[n - 1]) / 2);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
QVector<qreal> QSplineSeriesPrivate::firstControlPoints(const QVector<qreal>& vector)
|
|
|
{
|
|
|
QVector<qreal> result;
|
|
|
|
|
|
int count = vector.count();
|
|
|
result.resize(count);
|
|
|
result[0] = vector[0] / 2.0;
|
|
|
|
|
|
QVector<qreal> temp;
|
|
|
temp.resize(count);
|
|
|
temp[0] = 0;
|
|
|
|
|
|
qreal b = 2.0;
|
|
|
|
|
|
for (int i = 1; i < count; i++) {
|
|
|
temp[i] = 1 / b;
|
|
|
b = (i < count - 1 ? 4.0 : 3.5) - temp[i];
|
|
|
result[i]=(vector[i] - result[i - 1]) / b;
|
|
|
}
|
|
|
for (int i = 1; i < count; i++)
|
|
|
result[count - i - 1] -= temp[count - i] * result[count - i];
|
|
|
|
|
|
return result;
|
|
|
}
|
|
|
|
|
|
QPointF QSplineSeriesPrivate::controlPoint(int index) const
|
|
|
{
|
|
|
// Q_D(const QSplineSeries);
|
|
|
// return d->m_controlPoints[index];
|
|
|
return m_controlPoints[index];
|
|
|
}
|
|
|
|
|
|
/*!
|
|
|
Updates the control points, besed on currently avaiable knots.
|
|
|
*/
|
|
|
void QSplineSeriesPrivate::updateControlPoints()
|
|
|
{
|
|
|
Q_Q(QSplineSeries);
|
|
|
if (q->count() > 1) {
|
|
|
m_controlPoints.resize(2*q->count()-2);
|
|
|
calculateControlPoints();
|
|
|
}
|
|
|
}
|
|
|
|
|
|
Chart* QSplineSeriesPrivate::createGraphics(ChartPresenter* presenter)
|
|
|
{
|
|
|
Q_Q(QSplineSeries);
|
|
|
SplineChartItem* spline = new SplineChartItem(q,presenter);
|
|
|
if(presenter->animationOptions().testFlag(QChart::SeriesAnimations)) {
|
|
|
spline->setAnimator(presenter->animator());
|
|
|
spline->setAnimation(new SplineAnimation(spline));
|
|
|
}
|
|
|
|
|
|
presenter->chartTheme()->decorate(q, presenter->dataSet()->seriesIndex(q));
|
|
|
return spline;
|
|
|
}
|
|
|
|
|
|
#include "moc_qsplineseries.cpp"
|
|
|
#include "moc_qsplineseries_p.cpp"
|
|
|
|
|
|
QTCOMMERCIALCHART_END_NAMESPACE
|
|
|
|
