Package org.djutils.draw.line

Class Clothoid

java.lang.Object

org.djutils.draw.line.Clothoid

public final class Clothoid
extends Object

Approximate a clothoid with a PolyLine3d.
Derived from https://github.com/ebertolazzi/G1fitting/blob/master/src/Clothoid.cc

Author:

Alexander Verbraeck, Peter Knoppers

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static int	A_SERIE_SIZE	???
(package private) static double	A_THRESOLD	???
(package private) static double[]	FD	Fresnel coefficients FD.
(package private) static double[]	FN	Fresnel coefficients FN.
(package private) static double[]	GD	Fresnel coefficients GD.
(package private) static double[]	GN	Fresnel coefficients GN.
(package private) static double	m_1_pi	One over Pi.
(package private) static double	m_1_sqrt_pi	One over square root of Pi.
(package private) static double	m_2pi	Two Pi.
(package private) static double	m_pi	Pi.
(package private) static double	m_pi_2	Half Pi.

Method Summary

Modifier and Type	Method	Description
static int	buildClothoid(double x0, double y0, double theta0, double x1, double y1, double theta1)	Create a clothoid connecting (x0,y0) to (x1,y1) having direction theta0 at the start point and theta1 at the end point.
static int	buildClothoidMoreResults(double x0, double y0, double theta0, double x1, double y1, double theta1)	Create a clothoid connecting (x0,y0) to (x1,y1) having direction theta0 at the start point and theta1 at the end point.
(package private) static void	GeneralizedFresnelCS(int nk, double a, double b, double c, double[] intC, double[] intS)	???

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

A_THRESOLD

static final double A_THRESOLD

???

See Also:

Constant Field Values

A_SERIE_SIZE

static final int A_SERIE_SIZE

???

See Also:

Constant Field Values

FN

static final double[] FN

Fresnel coefficients FN.

FD

static final double[] FD

Fresnel coefficients FD.

GN

static final double[] GN

Fresnel coefficients GN.

GD

static final double[] GD

Fresnel coefficients GD.

m_pi

static final double m_pi

Pi.

See Also:

Constant Field Values

m_pi_2

static final double m_pi_2

Half Pi.

See Also:

Constant Field Values

m_2pi

static final double m_2pi

Two Pi.

See Also:

Constant Field Values

m_1_pi

static final double m_1_pi

One over Pi.

See Also:

Constant Field Values

m_1_sqrt_pi

static final double m_1_sqrt_pi

One over square root of Pi.

Method Detail

GeneralizedFresnelCS

static void GeneralizedFresnelCS(int nk,
                                 double a,
                                 double b,
                                 double c,
                                 double[] intC,
                                 double[] intS)

???

Parameters:

nk - int; ?

a - double; ?

b - double; ?

c - double; ?

intC - double[]; stores C results

intS - double[]; stores S results

buildClothoid

public static int buildClothoid(double x0,
                                double y0,
                                double theta0,
                                double x1,
                                double y1,
                                double theta1)

Create a clothoid connecting (x0,y0) to (x1,y1) having direction theta0 at the start point and theta1 at the end point.

Parameters:

x0 - double; x coordinate of the start point

y0 - double; y coordinate of the start point

theta0 - double; direction at the start point (in radians)

x1 - double; x coordinate of the end point

y1 - double; y coordinate of the end point

theta1 - double; direction at the end point (in radians)

Returns:

int; the number of iterations

buildClothoidMoreResults

public static int buildClothoidMoreResults(double x0,
                                           double y0,
                                           double theta0,
                                           double x1,
                                           double y1,
                                           double theta1)

Create a clothoid connecting (x0,y0) to (x1,y1) having direction theta0 at the start point and theta1 at the end point.

Parameters:

x0 - double; x coordinate of the start point

y0 - double; y coordinate of the start point

theta0 - double; direction at the start point (in radians)

x1 - double; x coordinate of the end point

y1 - double; y coordinate of the end point

theta1 - double; direction at the end point (in radians)

Returns:

int; the number of iterations