uk.ac.starlink.table.join

Class CdsHealpixSkyPixellator

java.lang.Object

uk.ac.starlink.table.join.HealpixSkyPixellator

uk.ac.starlink.table.join.CdsHealpixSkyPixellator

All Implemented Interfaces:

SkyPixellator

public class CdsHealpixSkyPixellator
extends HealpixSkyPixellator

HEALPix sky pixellator using the CDS-HEALPIX-JAVA library written by F-X Pineau at CDS.

The Nested indexing scheme is used, and the largest permissible k-value (depth) is 29.

Since:

21 May 2020

Author:

Mark Taylor

See Also:

https://github.com/cds-astro/cds-healpix-java

Constructor Summary

Constructors

Constructor and Description
CdsHealpixSkyPixellator()

Method Summary

Modifier and Type	Method and Description
int	calculateDefaultK(double scale) Determines a default value to use for the HEALPix k parameter based on a given scale.
protected void	configureK(int k) Updates internal state for the current value of the k parameter.
java.util.function.Supplier<FixedRadiusConePixer>	createFixedRadiusPixerFactory(double radius) Returns a factory for fixed radius pixel calculators based on the current settings of this object.
java.util.function.Supplier<VariableRadiusConePixer>	createVariableRadiusPixerFactory() Returns a factory for variable radius pixel calculators based on the current settings of this object.

Methods inherited from class uk.ac.starlink.table.join.HealpixSkyPixellator

getHealpixK, getMaxK, getScale, getTuningParameter, setHealpixK, setScale

Methods inherited from class java.lang.Object

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

Constructor Detail

CdsHealpixSkyPixellator

public CdsHealpixSkyPixellator()

Method Detail

configureK

protected void configureK(int k)

Description copied from class: HealpixSkyPixellator

Updates internal state for the current value of the k parameter.

Specified by:

configureK in class HealpixSkyPixellator

Parameters:

k - HEALPix order

createVariableRadiusPixerFactory

public java.util.function.Supplier<VariableRadiusConePixer> createVariableRadiusPixerFactory()

Description copied from interface: SkyPixellator

Returns a factory for variable radius pixel calculators based on the current settings of this object.

Returns:

immutable factory for pixel calculators; subsequent changes to this object will not affect the objects it supplies

createFixedRadiusPixerFactory

public java.util.function.Supplier<FixedRadiusConePixer> createFixedRadiusPixerFactory(double radius)

Description copied from interface: SkyPixellator

Returns a factory for fixed radius pixel calculators based on the current settings of this object.

Parameters:

radius - cone radius in radians

Returns:

immutable factory for pixel calculators; subsequent changes to this object will not affect the objects it supplies

calculateDefaultK

public int calculateDefaultK(double scale)

Determines a default value to use for the HEALPix k parameter based on a given scale.

Specified by:

calculateDefaultK in class HealpixSkyPixellator

Parameters:

scale - distance scale, in radians