def coords_to_filename(self, longitude, latitude):
"""Given coordinates in decimal degrees, map to the closest filename"""
if self.left_longitude > longitude or self.top_latitude < latitude:
return None
x_grid = MapUtils.int_trunc((longitude - self.left_longitude) *
self.xscale / self.img_width)
y_grid = MapUtils.int_trunc((self.top_latitude - latitude) *
self.yscale / self.img_height)
if not self.latfirst:
temp = x_grid
x_grid = y_grid
y_grid = temp
retstr = os.path.join(self.location,
self.prefix + MapUtils.ohstring(x_grid,
self.numdigits))
if self.usedash:
retstr = retstr + "-"
retstr = retstr + MapUtils.ohstring(y_grid, self.numdigits) + self.ext
return retstr
def coords_to_filename(self, longitude, latitude):
"""Given a pair of coordinates in deg.mmss, map to the
containing filename, e.g. q37122c2/012t0501.gif.
"""
latDeg = MapUtils.int_trunc(latitude)
longDeg = MapUtils.int_trunc(-longitude)
latMin = (latitude - latDeg) * 60.
longMin = (-longitude - longDeg) * 60.
# The 7.5 here is because of the 7.5 in the directory names above
# (we're getting the offset of this image from the origin of
# the 7.5-series map covered by the directory),
# not the map series we're actually plotting now.
longMinOrd = MapUtils.int_trunc(longMin / 7.5)
latMinOrd = MapUtils.int_trunc(latMin / 7.5)
dirname = "q" + MapUtils.ohstring(latDeg, 2) \
+ MapUtils.ohstring(longDeg, 3) \
+ chr(ord('a') + latMinOrd) + str(longMinOrd + 1)
# Find the difference between our desired coordinates
# and the origin of the map this directory represents.
# The 7.5 here is because of the 7.5 in the directory names above.
latMinDiff = latMin - (latMinOrd * 7.5)
longMinDiff = longMin - (longMinOrd * 7.5)
latOffset = MapUtils.int_trunc(latMinDiff * 10 / self.series)
longOffset = MapUtils.int_trunc(longMinDiff * 10 / self.series)
# Now calculate the current filename.
# Note that series is either 7.5 or 15
if (self.series > 13):
fileprefix = "024t"
numcharts = 5
else:
fileprefix = "012t"
numcharts = 10
filename = fileprefix + MapUtils.ohstring(numcharts - longOffset, 2) \
+ MapUtils.ohstring(numcharts - latOffset, 2) + self.img_ext
return self.location + "/" + dirname + "/" + filename
def coords_to_filename(self, longitude, latitude):
"""Given a pair of coordinates in deg.mmss, map to the
containing filename, e.g. q37122c2/012t0501.gif.
"""
latDeg = MapUtils.int_trunc(latitude)
longDeg = MapUtils.int_trunc(-longitude)
latMin = (latitude - latDeg) * 60.
longMin = (-longitude - longDeg) * 60.
# The 7.5 here is because of the 7.5 in the directory names above
# (we're getting the offset of this image from the origin of
# the 7.5-series map covered by the directory),
# not the map series we're actually plotting now.
longMinOrd = MapUtils.int_trunc(longMin / 7.5)
latMinOrd = MapUtils.int_trunc(latMin / 7.5)
dirname = "q" + MapUtils.ohstring(latDeg, 2) \
+ MapUtils.ohstring(longDeg, 3) \
+ chr(ord('a') + latMinOrd) + str(longMinOrd + 1)
# Find the difference between our desired coordinates
# and the origin of the map this directory represents.
# The 7.5 here is because of the 7.5 in the directory names above.
latMinDiff = latMin - (latMinOrd * 7.5)
longMinDiff = longMin - (longMinOrd * 7.5)
latOffset = MapUtils.int_trunc(latMinDiff * 10 / self.series)
longOffset = MapUtils.int_trunc(longMinDiff * 10 / self.series)
# Now calculate the current filename.
# Note that series is either 7.5 or 15
if (self.series > 13):
fileprefix = "024t"
numcharts = 5
else:
fileprefix = "012t"
numcharts = 10
filename = fileprefix + MapUtils.ohstring(numcharts - longOffset, 2) \
+ MapUtils.ohstring(numcharts - latOffset, 2) + self.img_ext
return self.location + "/" + dirname + "/" + filename
