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Add/modify license headers
Add/modify license headers
Jani Honkonen - - Load All Authors

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r794:4c76de65bbac
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qsplineseries.cpp
179 lines | 6.0 KiB | text/x-c | CppLexer
/ src / splinechart / qsplineseries.cpp
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Jani Honkonen
Add license headers
 r794 /****************************************************************************
**
** 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
** $QT_END_LICENSE$
**
****************************************************************************/
Marek Rosa
Spline initial
 r295 #include "qsplineseries.h"
Marek Rosa
QSplineSeries documentation added
 r433 /*!
\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.
*/
/*!
\fn QSeriesType QSplineSeries::type() const
Returns the type of the series
*/
/*!
\fn QSeriesType QSplineSeries::controlPoint(int index) const
Returns the control point specified by \a index
*/
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 r401 QTCOMMERCIALCHART_BEGIN_NAMESPACE
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 r433 /*!
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 transfered.
*/
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Spline initial
 r295 QSplineSeries::QSplineSeries(QObject *parent) :
Michal Klocek
Refactor scatter chart to fit the other classes...
 r470 QLineSeries(parent)
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Spline initial
 r295 {
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 r431 connect(this,SIGNAL(pointAdded(int)), this, SLOT(updateControlPoints()));
connect(this,SIGNAL(pointRemoved(int)), this, SLOT(updateControlPoints()));
connect(this,SIGNAL(pointReplaced(int)), this, SLOT(updateControlPoints()));
Marek Rosa
Spline initial
 r295 }
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Spline some more
 r305
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QSplineSeries documentation added
 r433 /*!
\internal
Calculates control points which are needed by QPainterPath.cubicTo function to draw the cubic Bezier cureve between two points.
*/
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Spline working somewhat
 r401 void QSplineSeries::calculateControlPoints()
{
// Based on http://www.codeproject.com/Articles/31859/Draw-a-Smooth-Curve-through-a-Set-of-2D-Points-wit
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QSplineSeries documentation added
 r433 // CPOL License
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Spline working somewhat
 r401
Marek Rosa
Table model data example
 r519 int n = count() - 1;
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Spline working somewhat
 r401 if (n == 1)
{ // Special case: Bezier curve should be a straight line.
// firstControlPoints = new Point[1];
// 3P1 = 2P0 + P3
Marek Rosa
Table model data example
 r519 m_controlPoints.append(QPointF((2 * x(0) + x(1)) / 3, (2 * y(0) + y(1)) / 3));
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Spline working somewhat
 r401
// P2 = 2P1 P0
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Table model data example
 r519 m_controlPoints.append(QPointF(2 * m_controlPoints[0].x() - x(0), 2 * m_controlPoints[0].y() - y(0)));
Marek Rosa
Spline working somewhat
 r401 return;
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Further changes
 r318 }
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Spline working somewhat
 r401 // Calculate first Bezier control points
// Right hand side vector
// 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 |
//
QList<qreal> rhs;
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Table model data example
 r519 rhs.append(x(0) + 2 * x(1));
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Spline working somewhat
 r401
// Set right hand side X values
Marek Rosa
Fixed a bug with last two control points calculation
 r429 for (int i = 1; i < n - 1; ++i)
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Table model data example
 r519 rhs.append(4 * x(i) + 2 * x(i + 1));
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Spline working somewhat
 r401
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Table model data example
 r519 rhs.append((8 * x(n - 1) + x(n)) / 2.0);
Marek Rosa
Spline working somewhat
 r401 // Get first control points X-values
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Table model data example
 r519 QList<qreal> xControl = getFirstControlPoints(rhs);
rhs[0] = y(0) + 2 * y(1);
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Spline working somewhat
 r401
// Set right hand side Y values
Marek Rosa
Fixed a bug with last two control points calculation
 r429 for (int i = 1; i < n - 1; ++i)
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Table model data example
 r519 rhs[i] = 4 * y(i) + 2 * y(i + 1);
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Spline working somewhat
 r401
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Table model data example
 r519 rhs[n - 1] = (8 * y(n - 1) + y(n)) / 2.0;
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Spline working somewhat
 r401 // Get first control points Y-values
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Table model data example
 r519 QList<qreal> yControl = getFirstControlPoints(rhs);
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Spline working somewhat
 r401
// Fill output arrays.
sauimone
minor code review issues. indent, spaces, brackets etc.
 r743 for (int i = 0; i < n; ++i) {
Marek Rosa
Spline working somewhat
 r401 // First control point
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Table model data example
 r519 m_controlPoints.append(QPointF(xControl[i], yControl[i]));
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Spline working somewhat
 r401 // Second control point
if (i < n - 1)
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Table model data example
 r519 m_controlPoints.append(QPointF(2 * x(i + 1) - xControl[i + 1], 2 * y(i + 1) - yControl[i + 1]));
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Spline working somewhat
 r401 else
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Table model data example
 r519 m_controlPoints.append(QPointF((x(n) + xControl[n - 1]) / 2, (y(n) + yControl[n - 1]) / 2));
Marek Rosa
Further changes
 r318 }
Marek Rosa
Spline working somewhat
 r401 }
Marek Rosa
QSplineSeries documentation added
 r433 /*!
\internal
*/
Marek Rosa
Spline working somewhat
 r401 QList<qreal> QSplineSeries::getFirstControlPoints(QList<qreal> rhs)
{
QList<qreal> x; // Solution vector.
QList<qreal> tmp; // Temp workspace.
qreal b = 2.0;
x.append(rhs[0] / b);
tmp.append(0);
sauimone
minor code review issues. indent, spaces, brackets etc.
 r743 for (int i = 1; i < rhs.size(); i++) {
// Decomposition and forward substitution.
Marek Rosa
Spline working somewhat
 r401 tmp.append(1 / b);
b = (i < rhs.size() - 1 ? 4.0 : 3.5) - tmp[i];
x.append((rhs[i] - x[i - 1]) / b);
}
for (int i = 1; i < rhs.size(); i++)
x[rhs.size() - i - 1] -= tmp[rhs.size() - i] * x[rhs.size() - i]; // Backsubstitution.
return x;
}
Marek Rosa
Added automatic refresh of control points on add/remove point. Spline example updated
 r431
Marek Rosa
QSplineSeries documentation added
 r433 /*!
\internal
Updates the control points, besed on currently avaiable knots.
*/
Marek Rosa
Added automatic refresh of control points on add/remove point. Spline example updated
 r431 void QSplineSeries::updateControlPoints()
{
sauimone
minor code review issues. indent, spaces, brackets etc.
 r743 if (count() > 1) {
Marek Rosa
Added automatic refresh of control points on add/remove point. Spline example updated
 r431 m_controlPoints.clear();
calculateControlPoints();
}
}
Marek Rosa
Table model data example
 r519 bool QSplineSeries::setModel(QAbstractItemModel* model)
{
QXYSeries::setModel(model);
Marek Rosa
QXYSeries: model data orientation added. QBarSeries: some model data function placeholders
 r527 // calculateControlPoints();
Jani Honkonen
Fix vs2010 build
 r605 return true;
Marek Rosa
QXYSeries: model data orientation added. QBarSeries: some model data function placeholders
 r527 }
void QSplineSeries::setModelMapping(int modelX, int modelY, Qt::Orientation orientation)
{
QLineSeries::setModelMapping(modelX, modelY, orientation);
Marek Rosa
XYSeries: added support for limited mapping area
 r734 // calculateControlPoints();
}
void QSplineSeries::setModelMappingShift(int first, int count)
{
QLineSeries::setModelMappingShift(first, count);
Marek Rosa
Table model data example
 r519 calculateControlPoints();
}
Marek Rosa
Spline working somewhat
 r401 #include "moc_qsplineseries.cpp"
QTCOMMERCIALCHART_END_NAMESPACE