Inheritance diagram for lsst.afw.geom._hpxUtils._ZOrderCurve2DInt:
Public Member Functions | |
| __init__ (self) | |
| xy2hash (self, x, y) | |
| ij2hash (self, i, j) | |
| i02hash (self, i) | |
| hash2ij (self, h) | |
| hash2i0 (self, _hash) | |
| ij2i (self, ij) | |
| 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__()
| lsst.afw.geom._hpxUtils._ZOrderCurve2DInt.__init__ | ( | self | ) |
Definition at line 303 of file _hpxUtils.py.
303 def __init__(self):
304 pass
305
Member Function Documentation
◆ hash2i0()
| 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.
412 def hash2i0(self, _hash):
413 """
414 Special case of hash2ij in which the discretized coordinate along
415 the vertical axis is zero.
416
417 Parameters
418 ----------
419 _hash : `int`
420 Space-filling hash value.
421
422 Returns
423 -------
424 ij : `np.int64`
425 Single value from which 2d coordinates can be extracted.
426 """
427 assert (0xFFFFFFFF33333333 & np.int64(_hash)) == 0
428 return self.hash2ij(_hash)
429
◆ hash2ij()
| 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.
371 def hash2ij(self, h):
372 """
373 Transforms the given space-filling hash value into a single value
374 from which the 2d coordinates can be extracted using ij2i and ij2j.
375
376 Parameters
377 ----------
378 h : `int`
379 Space-filling hash value
380
381 Returns
382 -------
383 ij : `np.int64`
384 Single value from which 2d coordinates can be extracted.
385 """
386 val1 = self.LUPT_TO_IJ_INT[
387 np.int32((np.uint64(h)
388 & np.uint64(0xFF00000000000000)) >> np.uint64(56))] << np.int64(28)
389 val2 = self.LUPT_TO_IJ_INT[
390 np.int32((np.uint64(h)
391 & np.uint64(0x00FF000000000000)) >> np.uint64(48))] << np.int64(24)
392 val3 = self.LUPT_TO_IJ_INT[
393 np.int32((np.uint64(h)
394 & np.uint64(0x0000FF0000000000)) >> np.uint64(40))] << np.int64(20)
395 val4 = self.LUPT_TO_IJ_INT[
396 np.int32((np.uint64(h)
397 & np.uint64(0x000000FF00000000)) >> np.uint64(32))] << np.int64(16)
398 val5 = self.LUPT_TO_IJ_INT[
399 np.int32((np.uint64(h)
400 & np.uint64(0x00000000FF000000)) >> np.uint64(24))] << np.int64(12)
401 val6 = self.LUPT_TO_IJ_INT[
402 np.int32((np.uint64(h)
403 & np.uint64(0x0000000000FF0000)) >> np.uint64(16))] << np.int64(8)
404 val7 = self.LUPT_TO_IJ_INT[
405 np.int32((np.uint64(h)
406 & np.uint64(0x000000000000FF00)) >> np.uint64(8))] << np.int64(4)
407 val8 = self.LUPT_TO_IJ_INT[
408 np.int32((np.uint64(h)
409 & np.uint64(0x00000000000000FF)))]
410 return val1 | val2 | val3 | val4 | val5 | val6 | val7 | val8
411
◆ i02hash()
| 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.
348 def i02hash(self, i):
349 """
350 Special case of ij2hash in which the discretized coordinate along
351 the vertical axis equals zero.
352
353 Parameters
354 ----------
355 i : `int`
356 i discretized coordinate along the horizontal axis.
357 Must fit within the 32-bit integer range.
358
359 Returns
360 -------
361 hash : `numpy.int64`
362 The space-filling hash value associated with the
363 given coordinate.
364 """
365 val1 = np.int64(self.LUPT_TO_HASH[np.uint32(i) >> np.uint32(24)] << np.int64(48))
366 val2 = np.int64(self.LUPT_TO_HASH[(np.uint32(i) & 0x00FF0000) >> np.uint32(16)] << np.uint64(32))
367 val3 = np.int64(self.LUPT_TO_HASH[(np.uint32(i) & 0x0000FF00) >> np.uint32(8)] << np.uint64(16))
368 val4 = np.int64(self.LUPT_TO_HASH[np.uint32(i) & 0x000000FF])
369 return val1 | val2 | val3 | val4
370
◆ ij2hash()
| 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.
327 def ij2hash(self, i, j):
328 """
329 Compute the hash value from discretized i, j.
330
331 Parameters
332 ----------
333 i : `int`
334 i discretized coordinate along the horizontal axis.
335 Must fit within the 32-bit integer range.
336 j : `int`
337 j discretized coordinate along the vertical axis.
338 Must fit within the 32-bit integer range.
339
340 Returns
341 -------
342 hash : `numpy.int64`
343 The space-filling hash value associated with the
344 given coordinates.
345 """
346 return (self.i02hash(np.int32(j)) << 1) | self.i02hash(np.int32(i))
347
◆ ij2i()
| 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.
430 def ij2i(self, ij):
431 """
432 Extract the discretized horizontal coordinate from hash2ij.
433
434 Parameters
435 ----------
436 ij : `int`
437 The ij result of hash2ij.
438
439 Returns
440 -------
441 i : `np.int32`
442 Discretized horizontal coordinate stored in ij.
443 """
444 return np.int32(ij)
445
◆ ij2j()
| 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.
446 def ij2j(self, ij):
447 """
448 Extract the discretized vertical coordinate from hash2ij.
449
450 Parameters
451 ----------
452 ij : `int`
453 The ij result of hash2ij.
454
455 Returns
456 -------
457 j : `np.int32`
458 Discretized vertical coordinate stored in ij.
459 """
460 return np.int32(np.uint64(ij) >> np.uint64(32))
◆ xy2hash()
| 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.
306 def xy2hash(self, x, y):
307 """
308 Compute the hash value from x/y.
309
310 Parameters
311 ----------
312 x : `float`
313 x coordinate along the horizontal axis.
314 Must fit within the 32-bit integer range.
315 y : `float`
316 y coordinate along the vertical axis.
317 Must fit within the 32-bit integer range.
318
319 Returns
320 -------
321 hash : `numpy.int64`
322 The space-filling hash value associated with the
323 given coordinates.
324 """
325 return self.ij2hash(np.int32(x), np.int32(y))
326
Member Data Documentation
◆ 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
|
static |
Definition at line 258 of file _hpxUtils.py.
The documentation for this class was generated from the following file:
- /j/snowflake/release/lsstsw/stack/lsst-scipipe-8.0.0/Linux64/afw/g5a732f18d5+53520f316c/python/lsst/afw/geom/_hpxUtils.py
