def print_low_accuracy():
'''
xyp -> latlon -> xyp: low accuracy
'''
from cs_ll import latlon2xyp, xyp2latlon
from cart_ll import latlon2xyz, xyz2latlon
from cart_cs import xyp2xyz, xyz2xyp
#------------------------------------------------
# at the panel border, low_accuracy
#------------------------------------------------
xyp1 = (-0.57735026918962606, -0.53747283769483301, 1)
xyp2 = (-0.57735026918962495, -0.53747283769483301, 1)
latlon1 = xyp2latlon(*xyp1)
latlon2 = xyp2latlon(*xyp2)
xyp1_dict = latlon2xyp( *xyp2latlon(*xyp1) )
xyp2_dict = latlon2xyp( *xyp2latlon(*xyp2) )
print('')
print(repr(latlon1))
print(repr(latlon2))
print(repr(xyp1_dict[1]))
print(repr(xyp2_dict[1]))
#a_equal(xyp1_dict.keys(), [1,4])
#a_equal(xyp2_dict.keys(), [1,4])
xyz1 = xyp2xyz(*xyp1)
xyz2 = xyp2xyz(*xyp2)
xyp1_list = xyz2xyp(*xyz1)
xyp2_list = xyz2xyp(*xyz2)
print('')
print(repr(xyz1))
print(repr(xyz2))
print(repr(xyp1_dict[1]), xyp1_dict.keys())
print(repr(xyp2_dict[1]), xyp1_dict.keys())
a = 1/np.sqrt(3)
at1, at2 = a*np.tan(-np.pi/4), a*np.tan(np.pi/4)
print('')
print(repr(at1), repr(at2))
def test_latlon2xyp_xyp2latlon():
'''
latlon2xyp() -> xyp2latlon() : check consistency, repeat 1000 times
'''
from cs_ll import latlon2xyp, xyp2latlon
N = 1000
R = 1
a = R/sqrt(3)
for i in range(N):
lat = pi*rand() - pi/2
lon = 2*pi*rand()
xyp_dict = latlon2xyp(lat, lon)
for panel, (x,y) in xyp_dict.items():
lat2, lon2 = xyp2latlon(x, y, panel)
aa_equal((lat,lon), (lat2,lon2), 12)