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"""Read .hc files."""
# Authors: The MNE-Python contributors.
# License: BSD-3-Clause
# Copyright the MNE-Python contributors.
import numpy as np
from ..._fiff.constants import FIFF
from ...utils import logger
from .constants import CTF
from .res4 import _make_ctf_name
_kind_dict = {
"nasion": CTF.CTFV_COIL_NAS,
"left ear": CTF.CTFV_COIL_LPA,
"right ear": CTF.CTFV_COIL_RPA,
"spare": CTF.CTFV_COIL_SPARE,
}
_coord_dict = {
"relative to dewar": FIFF.FIFFV_MNE_COORD_CTF_DEVICE,
"relative to head": FIFF.FIFFV_MNE_COORD_CTF_HEAD,
}
def _read_one_coil_point(fid):
"""Read coil coordinate information from the hc file."""
# Descriptor
one = "#"
while len(one) > 0 and one[0] == "#":
one = fid.readline()
if len(one) == 0:
return None
one = one.strip().decode("utf-8")
if "Unable" in one:
raise RuntimeError("HPI information not available")
# Hopefully this is an unambiguous interpretation
p = dict()
p["valid"] = "measured" in one
for key, val in _coord_dict.items():
if key in one:
p["coord_frame"] = val
break
else:
p["coord_frame"] = -1
for key, val in _kind_dict.items():
if key in one:
p["kind"] = val
break
else:
p["kind"] = -1
# Three coordinates
p["r"] = np.empty(3)
for ii, coord in enumerate("xyz"):
sp = fid.readline().decode("utf-8").strip()
if len(sp) == 0: # blank line
continue
sp = sp.split(" ")
if len(sp) != 3 or sp[0] != coord or sp[1] != "=":
raise RuntimeError(f"Bad line: {one}")
# We do not deal with centimeters
p["r"][ii] = float(sp[2]) / 100.0
return p
def _read_hc(directory):
"""Read the hc file to get the HPI info and to prepare for coord trans."""
fname, found = _make_ctf_name(directory, "hc", raise_error=False)
if not found:
logger.info(" hc data not present")
return None
s = list()
with open(fname, "rb") as fid:
while True:
p = _read_one_coil_point(fid)
if p is None:
# First point bad indicates that the file is empty
if len(s) == 0:
logger.info("hc file empty, no data present")
return None
# Returns None if at EOF
logger.info(" hc data read.")
return s
if p["valid"]:
s.append(p)
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