lsst.afw  22.0.1-32-g5ddfab5d3+23bd69c089
Public Member Functions | Static Public Attributes | List of all members
lsst.afw.geom._hpxUtils._ZOrderCurve2DInt Class Reference
Inheritance diagram for lsst.afw.geom._hpxUtils._ZOrderCurve2DInt:

Public Member Functions

def __init__ (self)
 
def xy2hash (self, x, y)
 
def ij2hash (self, i, j)
 
def i02hash (self, i)
 
def hash2ij (self, h)
 
def hash2i0 (self, _hash)
 
def ij2i (self, ij)
 
def ij2j (self, ij)
 

Static Public Attributes

 LUPT_TO_HASH
 
 LUPT_TO_IJ_INT
 

Detailed Description

Z-Order 2D curve for 32-bit integer values.

Code is ported from AladinSrc.jar version 11.024,
ZOrderCurve2DImpls.java.
AladinSrc.jar is licensed with GPLv3, see
http://aladin.u-strasbg.fr/COPYING

From the original documentation:
"Z-Order Curve (ZOC) implementation in which the vertical coordinate
carry the most significant bit (VMSB). This implementation is based
on a lookup table (LOOKUP). We assume that each discritized
coordinates is coded on maximum 32 bits (INT)."

Definition at line 217 of file _hpxUtils.py.

Constructor & Destructor Documentation

◆ __init__()

def lsst.afw.geom._hpxUtils._ZOrderCurve2DInt.__init__ (   self)

Definition at line 303 of file _hpxUtils.py.

Member Function Documentation

◆ hash2i0()

def lsst.afw.geom._hpxUtils._ZOrderCurve2DInt.hash2i0 (   self,
  _hash 
)
Special case of hash2ij in which the discretized coordinate along
the vertical axis is zero.

Parameters
----------
_hash : `int`
    Space-filling hash value.

Returns
-------
ij : `np.int64`
    Single value from which 2d coordinates can be extracted.

Definition at line 412 of file _hpxUtils.py.

◆ hash2ij()

def lsst.afw.geom._hpxUtils._ZOrderCurve2DInt.hash2ij (   self,
  h 
)
Transforms the given space-filling hash value into a single value
from which the 2d coordinates can be extracted using ij2i and ij2j.

Parameters
----------
h : `int`
    Space-filling hash value

Returns
-------
ij : `np.int64`
    Single value from which 2d coordinates can be extracted.

Definition at line 371 of file _hpxUtils.py.

◆ i02hash()

def lsst.afw.geom._hpxUtils._ZOrderCurve2DInt.i02hash (   self,
  i 
)
Special case of ij2hash in which the discretized coordinate along
the vertical axis equals zero.

Parameters
----------
i : `int`
    i discretized coordinate along the horizontal axis.
    Must fit within the 32-bit integer range.

Returns
-------
hash : `numpy.int64`
    The space-filling hash value associated with the
    given coordinate.

Definition at line 348 of file _hpxUtils.py.

◆ ij2hash()

def lsst.afw.geom._hpxUtils._ZOrderCurve2DInt.ij2hash (   self,
  i,
  j 
)
Compute the hash value from discretized i, j.

Parameters
----------
i : `int`
    i discretized coordinate along the horizontal axis.
    Must fit within the 32-bit integer range.
j : `int`
    j discretized coordinate along the vertical axis.
    Must fit within the 32-bit integer range.

Returns
-------
hash : `numpy.int64`
    The space-filling hash value associated with the
    given coordinates.

Definition at line 327 of file _hpxUtils.py.

◆ ij2i()

def lsst.afw.geom._hpxUtils._ZOrderCurve2DInt.ij2i (   self,
  ij 
)
Extract the discretized horizontal coordinate from hash2ij.

Parameters
----------
ij : `int`
    The ij result of hash2ij.

Returns
-------
i : `np.int32`
    Discretized horizontal coordinate stored in ij.

Definition at line 430 of file _hpxUtils.py.

◆ ij2j()

def lsst.afw.geom._hpxUtils._ZOrderCurve2DInt.ij2j (   self,
  ij 
)
Extract the discretized vertical coordinate from hash2ij.

Parameters
----------
ij : `int`
    The ij result of hash2ij.

Returns
-------
j : `np.int32`
    Discretized vertical coordinate stored in ij.

Definition at line 446 of file _hpxUtils.py.

◆ xy2hash()

def lsst.afw.geom._hpxUtils._ZOrderCurve2DInt.xy2hash (   self,
  x,
  y 
)
Compute the hash value from x/y.

Parameters
----------
x : `float`
    x coordinate along the horizontal axis.
    Must fit within the 32-bit integer range.
y : `float`
    y coordinate along the vertical axis.
    Must fit within the 32-bit integer range.

Returns
-------
hash : `numpy.int64`
    The space-filling hash value associated with the
    given coordinates.

Definition at line 306 of file _hpxUtils.py.

Member Data Documentation

◆ LUPT_TO_HASH

lsst.afw.geom._hpxUtils._ZOrderCurve2DInt.LUPT_TO_HASH
static
Initial value:
= np.array([
0x0000, 0x0001, 0x0004, 0x0005, 0x0010, 0x0011, 0x0014, 0x0015, 0x0040, 0x0041, 0x0044,
0x0045, 0x0050, 0x0051, 0x0054, 0x0055, 0x0100, 0x0101, 0x0104, 0x0105, 0x0110, 0x0111,
0x0114, 0x0115, 0x0140, 0x0141, 0x0144, 0x0145, 0x0150, 0x0151, 0x0154, 0x0155, 0x0400,
0x0401, 0x0404, 0x0405, 0x0410, 0x0411, 0x0414, 0x0415, 0x0440, 0x0441, 0x0444, 0x0445,
0x0450, 0x0451, 0x0454, 0x0455, 0x0500, 0x0501, 0x0504, 0x0505, 0x0510, 0x0511, 0x0514,
0x0515, 0x0540, 0x0541, 0x0544, 0x0545, 0x0550, 0x0551, 0x0554, 0x0555, 0x1000, 0x1001,
0x1004, 0x1005, 0x1010, 0x1011, 0x1014, 0x1015, 0x1040, 0x1041, 0x1044, 0x1045, 0x1050,
0x1051, 0x1054, 0x1055, 0x1100, 0x1101, 0x1104, 0x1105, 0x1110, 0x1111, 0x1114, 0x1115,
0x1140, 0x1141, 0x1144, 0x1145, 0x1150, 0x1151, 0x1154, 0x1155, 0x1400, 0x1401, 0x1404,
0x1405, 0x1410, 0x1411, 0x1414, 0x1415, 0x1440, 0x1441, 0x1444, 0x1445, 0x1450, 0x1451,
0x1454, 0x1455, 0x1500, 0x1501, 0x1504, 0x1505, 0x1510, 0x1511, 0x1514, 0x1515, 0x1540,
0x1541, 0x1544, 0x1545, 0x1550, 0x1551, 0x1554, 0x1555, 0x4000, 0x4001, 0x4004, 0x4005,
0x4010, 0x4011, 0x4014, 0x4015, 0x4040, 0x4041, 0x4044, 0x4045, 0x4050, 0x4051, 0x4054,
0x4055, 0x4100, 0x4101, 0x4104, 0x4105, 0x4110, 0x4111, 0x4114, 0x4115, 0x4140, 0x4141,
0x4144, 0x4145, 0x4150, 0x4151, 0x4154, 0x4155, 0x4400, 0x4401, 0x4404, 0x4405, 0x4410,
0x4411, 0x4414, 0x4415, 0x4440, 0x4441, 0x4444, 0x4445, 0x4450, 0x4451, 0x4454, 0x4455,
0x4500, 0x4501, 0x4504, 0x4505, 0x4510, 0x4511, 0x4514, 0x4515, 0x4540, 0x4541, 0x4544,
0x4545, 0x4550, 0x4551, 0x4554, 0x4555, 0x5000, 0x5001, 0x5004, 0x5005, 0x5010, 0x5011,
0x5014, 0x5015, 0x5040, 0x5041, 0x5044, 0x5045, 0x5050, 0x5051, 0x5054, 0x5055, 0x5100,
0x5101, 0x5104, 0x5105, 0x5110, 0x5111, 0x5114, 0x5115, 0x5140, 0x5141, 0x5144, 0x5145,
0x5150, 0x5151, 0x5154, 0x5155, 0x5400, 0x5401, 0x5404, 0x5405, 0x5410, 0x5411, 0x5414,
0x5415, 0x5440, 0x5441, 0x5444, 0x5445, 0x5450, 0x5451, 0x5454, 0x5455, 0x5500, 0x5501,
0x5504, 0x5505, 0x5510, 0x5511, 0x5514, 0x5515, 0x5540, 0x5541, 0x5544, 0x5545, 0x5550,
0x5551, 0x5554, 0x5555], dtype=np.int16)

Definition at line 232 of file _hpxUtils.py.

◆ LUPT_TO_IJ_INT

lsst.afw.geom._hpxUtils._ZOrderCurve2DInt.LUPT_TO_IJ_INT
static

Definition at line 258 of file _hpxUtils.py.


The documentation for this class was generated from the following file: