142 lines
5.2 KiB
Python
142 lines
5.2 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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''' Classes used by main program. '''
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from datetime import datetime
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import os
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import shutil
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from fractions import Fraction
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import pyexiv2
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class Radiation:
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''' Handles CSV processing. '''
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def __init__(self, timestamp, radiation, local_timezone, si_factor):
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self.timestamp = self._time_conversion(timestamp, local_timezone)
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self.radiation = self._radiation_conversion(radiation, si_factor)
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def __repr__(self):
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return '%s %f µS/h' % (str(self.timestamp), self.radiation)
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def _time_conversion(self, timestamp, local_timezone):
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csv_naive_time = datetime.fromisoformat(timestamp)
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# Set timezone
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csv_aware_time = csv_naive_time.astimezone(local_timezone)
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return csv_aware_time
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def _radiation_conversion(self, radiation, si_factor):
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# Convert CP/M to µS/h using si_factor
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radiation = round(float(radiation) * si_factor, 2)
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return radiation
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class Photo:
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''' Reads and writes Exif metadata. '''
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def __init__(self, photo, local_timezone, dest_dir, dry_run):
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self.get_date = self._get_creation_date(photo, local_timezone)
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self.get_target_photo = self._copy_photo(photo, dest_dir, dry_run)
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def __repr__(self):
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return 'Photo: %s Creation Date: %s' % (str(self.get_target_photo), str(self.get_date))
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def _copy_photo(self, photo, dest_dir, dry_run):
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# Determine where to work on photo and copy it there if needed.
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# Get image file name out of path
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photo_basename = os.path.basename(photo)
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# be os aware and use the correct directory delimiter for destfile
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dest_photo = os.path.join(dest_dir, photo_basename)
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# Copy photo to dest_dir and return its (new) filename
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# if not in dry_run mode or if dest_dir is different from src_dir.
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if dry_run is True:
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return photo
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if dest_dir != '.':
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shutil.copy(photo, dest_photo)
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return dest_photo
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def _get_creation_date(self, photo, local_timezone):
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# Load Exif data from photo
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metadata = pyexiv2.ImageMetadata(photo)
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metadata.read()
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print(metadata)
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date = metadata['Exif.Photo.DateTimeOriginal']
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# date.value creates datetime object in pic_naive_time
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pic_naive_time = date.value
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# Set timezone
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pic_aware_time = pic_naive_time.astimezone(local_timezone)
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return pic_aware_time
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class Exif:
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''' Converts, compiles and writes Exif-Tags from given values.
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Arguments:
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photo: file name of photo to modify
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radiation: radiation levels in µS/h
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latitude: latitude as float
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longitude: longitude as float
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elevation: elevation as float
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dry_run: whether to acutally write (True / False)
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'''
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def __init__(self, photo, radiation, latitude, longitude, elevation, dry_run):
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# self.get_degree = self._to_degree(value, loc)
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self.write_exif = self._write_exif(photo, radiation, latitude, longitude, elevation, dry_run)
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# def __repr__(self):
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# return 'Photo: %s Creation Date: %s' % (str(self.get_target_photo), str(self.get_date))
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def _to_degree(self, value, loc):
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if value < 0:
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loc_value = loc[0]
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elif value > 0:
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loc_value = loc[1]
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else:
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loc_value = ""
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abs_value = abs(value)
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deg = int(abs_value)
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t1 = (abs_value - deg) * 60
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minute = int(t1)
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second = round((t1 - minute) * 60, 5)
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return (deg, minute, second, loc_value)
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def _write_exif(self, photo, radiation, latitude, longitude, elevation, dry_run):
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metadata = pyexiv2.ImageMetadata(photo)
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metadata.read()
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latitude_degree = self._to_degree(latitude, ["S", "N"])
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longitude_degree = self._to_degree(longitude, ["W", "E"])
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print(latitude_degree)
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print(longitude_degree)
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# convert decimal coordinates into fractions required for pyexiv2
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exiv2_latitude = (Fraction(latitude_degree[0] * 60 + latitude_degree[1], 60),
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Fraction(int(round(latitude_degree[2] * 100, 0)), 6000),
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Fraction(0, 1))
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exiv2_longitude = (Fraction(longitude_degree[0] * 60 + longitude_degree[1], 60),
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Fraction(int(round(longitude_degree[2] * 100, 0)), 6000),
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Fraction(0, 1))
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# Set new UserComment
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new_comment = 'Radiation ☢ ' + str(radiation) + ' µS/h'
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# Exif tags to write
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metadata['Exif.GPSInfo.GPSLatitude'] = exiv2_latitude
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metadata['Exif.GPSInfo.GPSLatitudeRef'] = latitude_degree[3]
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metadata['Exif.GPSInfo.GPSLongitude'] = exiv2_longitude
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metadata['Exif.GPSInfo.GPSLongitudeRef'] = longitude_degree[3]
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metadata['Exif.GPSInfo.GPSAltitude'] = Fraction(elevation)
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metadata['Exif.GPSInfo.GPSAltitudeRef'] = '0'
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metadata['Exif.Image.GPSTag'] = 654
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metadata['Exif.GPSInfo.GPSMapDatum'] = "WGS-84"
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metadata['Exif.GPSInfo.GPSVersionID'] = '2 0 0 0'
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metadata['Exif.Photo.UserComment'] = new_comment
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print(new_comment)
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# Write Exif tags to file, if not in dry-run mode
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if dry_run is not True:
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metadata.write()
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return new_comment
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