Module imagingbook.common

Package imagingbook.common.geometry.fd

Class PolygonSampler

java.lang.Object

imagingbook.common.geometry.fd.PolygonSampler

public class PolygonSampler
extends Object

This class is used to re-sample 2D polygons by interpolation. See Sec. 2.1.1 (Alg. 26.1) if [1] for details. Note that this class has no public constructor, use getInstance() instead.

[1] W. Burger, M.J. Burge, Digital Image Processing – An Algorithmic Introduction Using Java, 2rd ed, Springer (2016).

Version:

2022/10/26

Method Summary

Modifier and Type	Method	Description
static PolygonSampler	getInstance()
Pnt2d[]	samplePolygon(Pnt2d[] V, int M)	Samples the closed polygon path specified by V at M equidistant positions.
Pnt2d[]	samplePolygon(Pnt2d[] V, int M, double startFrac)	For testing only: allows to choose an arbitrary start point by setting 'startFrac' in [0,1].

Methods inherited from class java.lang.Object

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

Method Details

getInstance

public static PolygonSampler getInstance()

samplePolygon

public Pnt2d[] samplePolygon(Pnt2d[] V,
 int M)

Samples the closed polygon path specified by V at M equidistant positions.

Parameters:

V - the vertices of the (closed) polygon.

M - the number of sample points.

Returns:

the sample points as an array of Point objects.

samplePolygon

public Pnt2d[] samplePolygon(Pnt2d[] V,
 int M,
 double startFrac)

For testing only: allows to choose an arbitrary start point by setting 'startFrac' in [0,1].

Parameters:

V - the vertices of the (closed) polygon.

M - the number of sample points.

startFrac - the position of the first sample as a fraction of the polggon's circumference in [0,1].

Returns:

the sample points as an array of Point objects.