fr.ign.cogit.geoxygene.util.algo.geometricAlgorithms.measure.shape

Class PolygonSignatureFunction

Object

PolygonSignatureFunction

public class PolygonSignatureFunction
extends Object

Geometrical function to analyse the shape of a polygon (Bel Hadj Ali, 2001): the shape is transformed into a function from [0,1] to R which represents the radial distance from the centroid to each vertex. The signature function is provided with a distance method inspired from the one in (Arkin et al 1991) dedicated to the turning function.

Author:

GTouya

Constructor Summary

Constructors

Constructor and Description
PolygonSignatureFunction(IPolygon polygon) Constructor with the origin on the first vertex.
PolygonSignatureFunction(IPolygon polygon, IDirectPosition origin) Constructor with the origin vertex as parameter.

Method Summary

Modifier and Type	Method and Description
double	distanceArkin(IPolygon polygon2) Compute the polygon signature function distance between two polygons according to Arkin's method (Arkin et al, 1991) that was dedicated to turning function.
IDirectPosition	getOrigin()
double	getValue(double s) If f is the polygon signature function, this method returns f(s) for s between 0 & 1.
void	print() Print the graph of the turning function in a dialog.
void	print(PolygonSignatureFunction func) Plot the graph of both turning functions in a dialog.
void	setOrigin(IDirectPosition origin)

Methods inherited from class Object

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

Constructor Detail

PolygonSignatureFunction

public PolygonSignatureFunction(IPolygon polygon)

Constructor with the origin on the first vertex.

Parameters:

polygon -

PolygonSignatureFunction

public PolygonSignatureFunction(IPolygon polygon,
                                IDirectPosition origin)

Constructor with the origin vertex as parameter.

Parameters:

polygon -

origin -

Method Detail

getValue

public double getValue(double s)

If f is the polygon signature function, this method returns f(s) for s between 0 & 1.

Parameters:

s -

Returns:

distanceArkin

public double distanceArkin(IPolygon polygon2)

Compute the polygon signature function distance between two polygons according to Arkin's method (Arkin et al, 1991) that was dedicated to turning function.

Parameters:

polygon2 -

Returns:

print

public void print()

Print the graph of the turning function in a dialog.

print

public void print(PolygonSignatureFunction func)

Plot the graph of both turning functions in a dialog.

getOrigin

public IDirectPosition getOrigin()

setOrigin

public void setOrigin(IDirectPosition origin)