Package cds.healpix.fillingcurve
Interface FillingCurve3D
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- All Known Implementing Classes:
ZOrderCurve3D
public interface FillingCurve3D
Interface defining a 3-dimensional space-filling curve. It provides method to transform 3d-coordinates in a single index in the curve. The index value is here called hash value since the intput parameters are discritized coordinates, and information is lost during the discretization.- Author:
- F.-X. Pineau
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description long
hash2i00(long hash)
Special case ofhash2ijk(long)
in which the discretized coordinate along the vertical axis equals zero.long
hash2ijk(long hash)
Transforms the given space filling curve index (or hash value) into a single value from which it is straightforward to extract the associated 3d-coordinates using methodsijk2i(long)
,ijk2j(long)
andijk2k(long)
.long
i002hash(int i)
Special case ofijk2hash(int, int, int)
in which the discretized coordinate along the vertical axis equals zero.long
ijk2hash(int i, int j, int k)
Transforms coordinates in a discretized 2d-space into a space filling curve index.int
ijk2i(long ijk)
Extract the discretized horizontal coordinates from the result of the methodhash2ijk(long)
.int
ijk2j(long ijk)
Extract the discretized vertical coordinates from the result of the methodhash2ijk(long)
.int
ijk2k(long ijk)
Extract the discretized depth coordinates from the result of the methodhash2ijk(long)
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Method Detail
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ijk2hash
long ijk2hash(int i, int j, int k)
Transforms coordinates in a discretized 2d-space into a space filling curve index. This can be thought of as computing a hash value from 3d-coordinates.- Parameters:
i
- discretized coordinate along the horizontal axisj
- discretized coordinate along the vertical axisk
- discretized coordinate along the depth axis- Returns:
- the space filling curve index (or hash value) associated to the given discretized 3d-coordinates.
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i002hash
long i002hash(int i)
Special case ofijk2hash(int, int, int)
in which the discretized coordinate along the vertical axis equals zero.- Parameters:
i
- discretized coordinate along the horizontal axis- Returns:
- the space filling curve index (or hash value) associated to the given discretized horizontal coordinate, assuming the discretized vertical coordinate equal zero.
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hash2ijk
long hash2ijk(long hash)
Transforms the given space filling curve index (or hash value) into a single value from which it is straightforward to extract the associated 3d-coordinates using methodsijk2i(long)
,ijk2j(long)
andijk2k(long)
.- Parameters:
hash
- the space filling curve index (or hash value)- Returns:
- a single value from which it is straightforward to extract the associated
3d-coordinates using methods
ijk2i(long)
,ijk2j(long)
andijk2k(long)
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hash2i00
long hash2i00(long hash)
Special case ofhash2ijk(long)
in which the discretized coordinate along the vertical axis equals zero.- Parameters:
hash
- the space filling curve index (or hash value)- Returns:
- a single value, knowing the vertical coordinate equals zero, from which it is
straightforward to extract the associated horizontal coordinate using method
ijk2i(long)
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ijk2i
int ijk2i(long ijk)
Extract the discretized horizontal coordinates from the result of the methodhash2ijk(long)
.- Parameters:
ijk
- result of the methodhash2ijk(long)
- Returns:
- the discretized horizontal coordinate stored in the given parameter
ijk
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ijk2j
int ijk2j(long ijk)
Extract the discretized vertical coordinates from the result of the methodhash2ijk(long)
.- Parameters:
ijk
- result of the methodhash2ijk(long)
- Returns:
- the discretized horizontal coordinate stored in the given parameter
ijk
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ijk2k
int ijk2k(long ijk)
Extract the discretized depth coordinates from the result of the methodhash2ijk(long)
.- Parameters:
ijk
- result of the methodhash2ijk(long)
- Returns:
- the discretized horizontal coordinate stored in the given parameter
ijk
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