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qsplineseries.cpp
155 lines | 5.1 KiB | text/x-c | CppLexer
/ src / splinechart / qsplineseries.cpp
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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
*/
Marek Rosa
Spline working somewhat
 r401 QTCOMMERCIALCHART_BEGIN_NAMESPACE
Marek Rosa
QSplineSeries documentation added
 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.
*/
Marek Rosa
Spline initial
 r295 QSplineSeries::QSplineSeries(QObject *parent) :
Michal Klocek
Refactor scatter chart to fit the other classes...
 r470 QLineSeries(parent)
Marek Rosa
Spline initial
 r295 {
Marek Rosa
Added automatic refresh of control points on add/remove point. Spline example updated
 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 }
Marek Rosa
Spline some more
 r305
Marek Rosa
QSplineSeries documentation added
 r433 /*!
\internal
Calculates control points which are needed by QPainterPath.cubicTo function to draw the cubic Bezier cureve between two points.
*/
Marek Rosa
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
Marek Rosa
QSplineSeries documentation added
 r433 // CPOL License
Marek Rosa
Spline working somewhat
 r401
Marek Rosa
Table model data example
 r519 int n = count() - 1;
Marek Rosa
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));
Marek Rosa
Spline working somewhat
 r401
// P2 = 2P1 P0
Marek Rosa
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;
Marek Rosa
Further changes
 r318 }
Marek Rosa
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;
Marek Rosa
Table model data example
 r519 rhs.append(x(0) + 2 * x(1));
Marek Rosa
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)
Marek Rosa
Table model data example
 r519 rhs.append(4 * x(i) + 2 * x(i + 1));
Marek Rosa
Spline working somewhat
 r401
Marek Rosa
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
Marek Rosa
Table model data example
 r519 QList<qreal> xControl = getFirstControlPoints(rhs);
rhs[0] = y(0) + 2 * y(1);
Marek Rosa
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)
Marek Rosa
Table model data example
 r519 rhs[i] = 4 * y(i) + 2 * y(i + 1);
Marek Rosa
Spline working somewhat
 r401
Marek Rosa
Table model data example
 r519 rhs[n - 1] = (8 * y(n - 1) + y(n)) / 2.0;
Marek Rosa
Spline working somewhat
 r401 // Get first control points Y-values
Marek Rosa
Table model data example
 r519 QList<qreal> yControl = getFirstControlPoints(rhs);
Marek Rosa
Spline working somewhat
 r401
// Fill output arrays.
Marek Rosa
Fixed a bug with last two control points calculation
 r429 for (int i = 0; i < n; ++i)
Marek Rosa
Further changes
 r318 {
Marek Rosa
Spline working somewhat
 r401 // First control point
Marek Rosa
Table model data example
 r519 m_controlPoints.append(QPointF(xControl[i], yControl[i]));
Marek Rosa
Spline working somewhat
 r401 // Second control point
if (i < n - 1)
Marek Rosa
Table model data example
 r519 m_controlPoints.append(QPointF(2 * x(i + 1) - xControl[i + 1], 2 * y(i + 1) - yControl[i + 1]));
Marek Rosa
Spline working somewhat
 r401 else
Marek Rosa
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);
for (int i = 1; i < rhs.size(); i++) // Decomposition and forward substitution.
{
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()
{
Marek Rosa
Table model data example
 r519 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
Table model data example
 r519 calculateControlPoints();
}
Marek Rosa
Spline working somewhat
 r401 #include "moc_qsplineseries.cpp"
QTCOMMERCIALCHART_END_NAMESPACE