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.TH "QwtSplineLocal" 3 "Sun Jul 18 2021" "Version 6.2.0" "Qwt User's Guide" \" -*- nroff -*-
.ad l
.nh
.SH NAME
QwtSplineLocal \- A spline with C1 continuity\&.
.SH SYNOPSIS
.br
.PP
.PP
\fC#include <qwt_spline_local\&.h>\fP
.PP
Inherits \fBQwtSplineC1\fP\&.
.SS "Public Types"
.in +1c
.ti -1c
.RI "enum \fBType\fP { \fBCardinal\fP, \fBParabolicBlending\fP, \fBAkima\fP, \fBPChip\fP }"
.br
.RI "Spline interpolation type\&. "
.in -1c
.SS "Public Member Functions"
.in +1c
.ti -1c
.RI "\fBQwtSplineLocal\fP (\fBType\fP \fBtype\fP)"
.br
.RI "Constructor\&. "
.ti -1c
.RI "virtual \fB~QwtSplineLocal\fP ()"
.br
.RI "Destructor\&. "
.ti -1c
.RI "\fBType\fP \fBtype\fP () const"
.br
.ti -1c
.RI "virtual uint \fBlocality\fP () const override"
.br
.ti -1c
.RI "virtual QPainterPath \fBpainterPath\fP (const QPolygonF &) const override"
.br
.RI "Interpolate a curve with Bezier curves\&. "
.ti -1c
.RI "virtual \fBQVector\fP< QLineF > \fBbezierControlLines\fP (const QPolygonF &) const override"
.br
.RI "Interpolate a curve with Bezier curves\&. "
.ti -1c
.RI "virtual \fBQVector\fP< \fBQwtSplinePolynomial\fP > \fBpolynomials\fP (const QPolygonF &) const override"
.br
.RI "Calculate the interpolating polynomials for a non parametric spline\&. "
.ti -1c
.RI "virtual \fBQVector\fP< double > \fBslopes\fP (const QPolygonF &) const override"
.br
.RI "Find the first derivative at the control points\&. "
.in -1c
.SH "Detailed Description"
.PP
A spline with C1 continuity\&.
\fBQwtSplineLocal\fP offers several standard algorithms for interpolating a curve with polynomials having C1 continuity at the control points\&. All algorithms are local in a sense, that changing one control point only few polynomials\&.
.PP
Definition at line 24 of file qwt_spline_local\&.h\&.
.SH "Member Enumeration Documentation"
.PP
.SS "enum \fBQwtSplineLocal::Type\fP"
.PP
Spline interpolation type\&. All type of spline interpolations are lightweight algorithms calculating the slopes at a point by looking 1 or 2 points back and ahead\&.
.PP
\fBEnumerator\fP
.in +1c
.TP
\fB\fICardinal \fP\fP
A cardinal spline
.PP
The cardinal spline interpolation is a very cheap calculation with a locality of 1\&.
.TP
\fB\fIParabolicBlending \fP\fP
Parabolic blending is a cheap calculation with a locality of 1\&. Sometimes it is also called Cubic Bessel interpolation\&.
.TP
\fB\fIAkima \fP\fP
The algorithm of H\&.Akima is a calculation with a locality of 2\&.
.TP
\fB\fIPChip \fP\fP
Piecewise Cubic Hermite Interpolating Polynomial (PCHIP) is an algorithm that is popular because of being offered by MATLAB\&.
.PP
It preserves the shape of the data and respects monotonicity\&. It has a locality of 1\&.
.PP
Definition at line 34 of file qwt_spline_local\&.h\&.
.SH "Constructor & Destructor Documentation"
.PP
.SS "QwtSplineLocal::QwtSplineLocal (\fBType\fP type)"
.PP
Constructor\&.
.PP
\fBParameters\fP
.RS 4
\fItype\fP Spline type, specifying the type of interpolation
.RE
.PP
\fBSee also\fP
.RS 4
\fBtype()\fP
.RE
.PP
.PP
Definition at line 450 of file qwt_spline_local\&.cpp\&.
.SH "Member Function Documentation"
.PP
.SS "\fBQVector\fP< QLineF > QwtSplineLocal::bezierControlLines (const QPolygonF & points) const\fC [override]\fP, \fC [virtual]\fP"
.PP
Interpolate a curve with Bezier curves\&. Interpolates a polygon piecewise with cubic Bezier curves and returns the 2 control points of each curve as QLineF\&.
.PP
\fBParameters\fP
.RS 4
\fIpoints\fP Control points
.RE
.PP
\fBReturns\fP
.RS 4
Control points of the interpolating Bezier curves
.RE
.PP
.PP
Reimplemented from \fBQwtSplineC1\fP\&.
.PP
Definition at line 502 of file qwt_spline_local\&.cpp\&.
.SS "uint QwtSplineLocal::locality () const\fC [override]\fP, \fC [virtual]\fP"
The locality of an spline interpolation identifies how many adjacent polynomials are affected, when changing the position of one point\&.
.PP
The Cardinal, ParabolicBlending and PChip algorithms have a locality of 1, while the Akima interpolation has a locality of 2\&.
.PP
\fBReturns\fP
.RS 4
1 or 2\&.
.RE
.PP
.PP
Reimplemented from \fBQwtSpline\fP\&.
.PP
Definition at line 552 of file qwt_spline_local\&.cpp\&.
.SS "QPainterPath QwtSplineLocal::painterPath (const QPolygonF & points) const\fC [override]\fP, \fC [virtual]\fP"
.PP
Interpolate a curve with Bezier curves\&. Interpolates a polygon piecewise with cubic Bezier curves and returns them as QPainterPath\&.
.PP
\fBParameters\fP
.RS 4
\fIpoints\fP Control points
.RE
.PP
\fBReturns\fP
.RS 4
Painter path, that can be rendered by QPainter
.RE
.PP
.PP
Reimplemented from \fBQwtSplineC1\fP\&.
.PP
Definition at line 482 of file qwt_spline_local\&.cpp\&.
.SS "\fBQVector\fP< \fBQwtSplinePolynomial\fP > QwtSplineLocal::polynomials (const QPolygonF & points) const\fC [override]\fP, \fC [virtual]\fP"
.PP
Calculate the interpolating polynomials for a non parametric spline\&.
.PP
\fBParameters\fP
.RS 4
\fIpoints\fP Control points
.RE
.PP
\fBReturns\fP
.RS 4
Interpolating polynomials
.RE
.PP
\fBNote\fP
.RS 4
The x coordinates need to be increasing or decreasing
.PP
The implementation simply calls \fBQwtSplineC1::polynomials()\fP, but is intended to be replaced by a one pass calculation some day\&.
.RE
.PP
.PP
Reimplemented from \fBQwtSplineC1\fP\&.
.PP
Definition at line 537 of file qwt_spline_local\&.cpp\&.
.SS "\fBQVector\fP< double > QwtSplineLocal::slopes (const QPolygonF & points) const\fC [override]\fP, \fC [virtual]\fP"
.PP
Find the first derivative at the control points\&.
.PP
\fBParameters\fP
.RS 4
\fIpoints\fP Control nodes of the spline
.RE
.PP
\fBReturns\fP
.RS 4
Vector with the values of the 2nd derivate at the control points
.RE
.PP
\fBNote\fP
.RS 4
The x coordinates need to be increasing or decreasing
.RE
.PP
.PP
Implements \fBQwtSplineC1\fP\&.
.PP
Definition at line 521 of file qwt_spline_local\&.cpp\&.
.SS "\fBQwtSplineLocal::Type\fP QwtSplineLocal::type () const"
.PP
\fBReturns\fP
.RS 4
Spline type, specifying the type of interpolation
.RE
.PP
.PP
Definition at line 468 of file qwt_spline_local\&.cpp\&.
.SH "Author"
.PP
Generated automatically by Doxygen for Qwt User's Guide from the source code\&.