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1# This file is part of afw. 

2# 

3# Developed for the LSST Data Management System. 

4# This product includes software developed by the LSST Project 

5# (https://www.lsst.org). 

6# See the COPYRIGHT file at the top-level directory of this distribution 

7# for details of code ownership. 

8# 

9# This program is free software: you can redistribute it and/or modify 

10# it under the terms of the GNU General Public License as published by 

11# the Free Software Foundation, either version 3 of the License, or 

12# (at your option) any later version. 

13# 

14# This program is distributed in the hope that it will be useful, 

15# but WITHOUT ANY WARRANTY; without even the implied warranty of 

16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

17# GNU General Public License for more details. 

18# 

19# You should have received a copy of the GNU General Public License 

20# along with this program. If not, see <https://www.gnu.org/licenses/>. 

21 

22import numpy as np 

23 

24from lsst.utils import continueClass 

25from ._python import reduceTransform 

26from ._geom import (SkyWcs, makeCdMatrix, makeFlippedWcs, makeModifiedWcs, 

27 makeSkyWcs, makeTanSipWcs, makeWcsPairTransform, 

28 getIntermediateWorldCoordsToSky, getPixelToIntermediateWorldCoords) 

29 

30__all__ = ["SkyWcs", "makeCdMatrix", "makeFlippedWcs", "makeSkyWcs", 

31 "makeModifiedWcs", "makeTanSipWcs", "makeWcsPairTransform", 

32 "getIntermediateWorldCoordsToSky", "getPixelToIntermediateWorldCoords"] 

33 

34 

35@continueClass # noqa: F811 (FIXME: remove for py 3.8+) 

36class SkyWcs: # noqa: F811 

37 def pixelToSkyArray(self, x, y, degrees=False): 

38 """ 

39 Convert numpy array pixels (x, y) to numpy array sky (ra, dec) 

40 positions. 

41 

42 Parameters 

43 ---------- 

44 x : `np.ndarray` 

45 Array of x values. 

46 y : `np.ndarray` 

47 Array of y values. 

48 degrees : `bool`, optional 

49 Return ra, dec arrays in degrees if True. 

50 

51 Returns 

52 ------- 

53 ra : `np.ndarray` 

54 Array of Right Ascension. Units are radians unless 

55 degrees=True. 

56 dec : `np.ndarray` 

57 Array of Declination. Units are radians unless 

58 degrees=True. 

59 """ 

60 xy = np.vstack((x, y)) 

61 ra, dec = np.vsplit(self.getTransform().getMapping().applyForward(xy), 2) 

62 ra %= (2.*np.pi) 

63 

64 if degrees: 

65 return np.rad2deg(ra.ravel()), np.rad2deg(dec.ravel()) 

66 else: 

67 return ra.ravel(), dec.ravel() 

68 

69 def skyToPixelArray(self, ra, dec, degrees=False): 

70 """ 

71 Convert numpy array sky (ra, dec) positions to numpy array 

72 pixels (x, y). 

73 

74 Parameters 

75 ---------- 

76 ra : `np.ndarray` 

77 Array of Right Ascension. Units are radians unless 

78 degrees=True. 

79 dec : `np.ndarray` 

80 Array of Declination. Units are radians unless 

81 degrees=True. 

82 degrees : `bool`, optional 

83 Input ra, dec arrays are degrees if True. 

84 

85 Returns 

86 ------- 

87 x : `np.ndarray` 

88 Array of x values. 

89 y : `np.ndarray` 

90 Array of y values. 

91 """ 

92 radec = np.vstack((ra, dec)) 

93 if degrees: 

94 radec = np.deg2rad(radec) 

95 

96 x, y = np.vsplit(self.getTransform().getMapping().applyInverse(radec), 2) 

97 

98 return x.ravel(), y.ravel() 

99 

100 

101SkyWcs.__reduce__ = reduceTransform