Spline_< T > Class Template Reference

This class implements a non-uniform B-spline curve. More...

#include <Spline.h>

Inheritance diagram for Spline_< T >:

Classes
class	SplineImpl
Public Member Functions
	Spline_ (int degree, const Vector &x, const Vector_< T > &y)
	Create a Spline_ object based on a set of control points.
	Spline_ (const Spline_ &copy)
	Spline_ ()
Spline_ &	operator= (const Spline_ &copy)
	~Spline_ ()
T	calcValue (const Vector &x) const
	Calculate the values of the dependent variables at a particular value of the independent variable.
T	calcDerivative (const std::vector< int > &derivComponents, const Vector &x) const
	Calculate a derivative of the spline function.
int	getArgumentSize () const
	Get the number of components expected in the input vector.
int	getMaxDerivativeOrder () const
	Get the maximum derivative order this Function_ object can calculate.
const Vector &	getControlPointLocations () const
	Get the locations (that is, the values of the independent variable) of the control points.
const Vector_< T > &	getControlPointValues () const
	Get the values of the dependent variables at the control points.
int	getSplineDegree () const
	Get the degree of the spline.

Detailed Description

template<class T>
class SimTK::Spline_< T >

This class implements a non-uniform B-spline curve.

It requires the spline degree to be odd (linear, cubic, quintic, etc.), but supports arbitrarily high degrees. Only spline curves are supported, not surfaces or higher dimensional objects, but the curve may be defined in an arbitrary dimensional space. That is, a Spline_ is a Function_ that calculates an arbitrary number of output values based on a single input value. The template argument must be either Real or Vec<N> from some integer N. The name "Spline" (with no trailing _) may be used as a synonym for Spline_<Real>.

Constructor & Destructor Documentation

Spline_	(	int	degree,
		const Vector &	x,
		const Vector_< T > &	y
	)			`[inline]`

Create a Spline_ object based on a set of control points.

Parameters:

	degree	the degree of the spline to create. This must be a positive odd value.
	x	the values of the independent variable for each control point
	y	the values of the dependent variables for each control point

Spline_ ( const Spline_< T > & copy ) [inline]

References SplineImpl::referenceCount.

Spline_ ( ) [inline]

~Spline_ ( ) [inline]

References SplineImpl::referenceCount.

Member Function Documentation

T calcDerivative	(	const std::vector< int > &	derivComponents,
		const Vector &	x
	)			const `[inline, virtual]`

Calculate a derivative of the spline function.

See the Function_ class for details. Because Spline_ only allows a single independent variable, all elements of derivComponents should be 0, and its length determines the order of the derivative to calculate.

Implements Function_< T >.

References SplineImpl::getDerivative(), and VectorBase< ELT >::size().

T calcValue ( const Vector & x ) const [inline, virtual]

Calculate the values of the dependent variables at a particular value of the independent variable.

Parameters:

x

a Vector of length 1 containing the value of the independent variable.

Implements Function_< T >.

References SplineImpl::getValue(), and VectorBase< ELT >::size().

int getArgumentSize ( ) const [inline, virtual]

Get the number of components expected in the input vector.

Implements Function_< T >.