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Qwt User's Guide 6.3.0
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An approximation using a basis spline. More...
#include <qwt_spline_basis.h>
Public Member Functions | |
| QwtSplineBasis () | |
| Constructor. | |
| virtual | ~QwtSplineBasis () |
| Destructor. | |
| virtual QPainterPath | painterPath (const QPolygonF &) const override |
| virtual uint | locality () const override |
| The locality is always 2. | |
Public Member Functions inherited from QwtSpline | |
| QwtSpline () | |
| Constructor. | |
| virtual | ~QwtSpline () |
| Destructor. | |
| void | setParametrization (int type) |
| void | setParametrization (QwtSplineParametrization *) |
| const QwtSplineParametrization * | parametrization () const |
| void | setBoundaryType (BoundaryType) |
| BoundaryType | boundaryType () const |
| void | setBoundaryValue (BoundaryPosition, double value) |
| Define the boundary value. | |
| double | boundaryValue (BoundaryPosition) const |
| void | setBoundaryCondition (BoundaryPosition, int condition) |
| Define the condition for an endpoint of the spline. | |
| int | boundaryCondition (BoundaryPosition) const |
| void | setBoundaryConditions (int condition, double valueBegin=0.0, double valueEnd=0.0) |
| Define the condition at the endpoints of a spline. | |
| virtual QPolygonF | polygon (const QPolygonF &, double tolerance) const |
| Interpolate a curve by a polygon. | |
Additional Inherited Members | |
Public Types inherited from QwtSpline | |
| enum | BoundaryType { ConditionalBoundaries , PeriodicPolygon , ClosedPolygon } |
| enum | BoundaryPosition { AtBeginning , AtEnd } |
| enum | BoundaryCondition { Clamped1 , Clamped2 , Clamped3 , LinearRunout } |
| Boundary condition. More... | |
An approximation using a basis spline.
QwtSplineBasis approximates a set of points by a polynomials with C2 continuity ( = first and second derivatives are equal ) at the end points.
The end points of the spline do not match the original points.
Definition at line 24 of file qwt_spline_basis.h.
| QwtSplineBasis::QwtSplineBasis | ( | ) |
Constructor.
Definition at line 227 of file qwt_spline_basis.cpp.
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virtual |
Destructor.
Definition at line 232 of file qwt_spline_basis.cpp.
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overridevirtual |
The locality is always 2.
Reimplemented from QwtSpline.
Definition at line 237 of file qwt_spline_basis.cpp.
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overridevirtual |
Approximates a polygon piecewise with cubic Bezier curves and returns them as QPainterPath.
| points | Control points |
Implements QwtSpline.
Definition at line 249 of file qwt_spline_basis.cpp.