OK, replace your copy of weeplot/utilities.py with the attached. Incidentally, good sleuthing when you figured out the problem! It made it easy to come up with the fix.
-tk On Tue, Sep 25, 2018 at 2:17 PM R Sparkes <rjspar...@gmail.com> wrote: > Excellent! > Much appreciated. > > On Tue, 25 Sep 2018 at 23:18, Thomas Keffer <tkef...@gmail.com> wrote: > >> I was able to reproduce this. I've created issue #344 >> <https://github.com/weewx/weewx/issues/344> to track. >> >> Shouldn't be too hard to fix. >> >> -tk >> >> On Mon, Sep 24, 2018 at 11:44 PM Greeebs <rjspar...@gmail.com> wrote: >> >>> Hi all, >>> New weewx user here using a home brew weather station based on Arduino's >>> and nRF24L01+ radios. >>> I wrote my own driver to accept packets on the nRF24L01 attached to the >>> RPi and weewx is happily accepting my LOOP packets and producing reports >>> every archiving period. I've also managed to import the last 18 months of >>> weather data I had collected prior to installing weewx. Until today, weewx >>> has been going fantastically. >>> >>> Today I encountered a weird issue which I've not found described >>> elsewhere. I was getting a divide by zero error during graph generation and >>> none of my graphs were being updated. >>> >>> I had a period of 24+ hours where my humidity was stuck at 100%. As soon >>> as it dropped to 99%, the error went away and all of my graphs were updated. >>> >>> It turns out that if you specify only a maximum value for a graph, and >>> have a period where the reading for the entire graph period was at that >>> maximum, you get the divide by zero error. >>> Is this a known bug? >>> >>> Here's the relevant section from the log: >>> Sep 25 06:26:19 hub-pi weewx[436]: reportengine: Caught unrecoverable >>> exception in generator weewx.imagegenerator.ImageGenerator >>> Sep 25 06:26:19 hub-pi weewx[436]: **** float division by zero >>> Sep 25 06:26:19 hub-pi weewx[436]: **** Traceback (most recent >>> call last): >>> Sep 25 06:26:19 hub-pi weewx[436]: **** File >>> "/usr/share/weewx/weewx/reportengine.py", line 239, in run >>> Sep 25 06:26:19 hub-pi weewx[436]: **** obj.start() >>> Sep 25 06:26:19 hub-pi weewx[436]: **** File >>> "/usr/share/weewx/weewx/reportengine.py", line 273, in start >>> Sep 25 06:26:19 hub-pi weewx[436]: **** self.run() >>> Sep 25 06:26:19 hub-pi weewx[436]: **** File >>> "/usr/share/weewx/weewx/imagegenerator.py", line 32, in run >>> Sep 25 06:26:19 hub-pi weewx[436]: **** >>> self.genImages(self.gen_ts) >>> Sep 25 06:26:19 hub-pi weewx[436]: **** File >>> "/usr/share/weewx/weewx/imagegenerator.py", line 235, in genImages >>> Sep 25 06:26:19 hub-pi weewx[436]: **** image = >>> plot.render() >>> Sep 25 06:26:19 hub-pi weewx[436]: **** File >>> "/usr/share/weewx/weeplot/genplot.py", line 195, in render >>> Sep 25 06:26:19 hub-pi weewx[436]: **** sdraw = >>> self._getScaledDraw(draw) >>> Sep 25 06:26:19 hub-pi weewx[436]: **** File >>> "/usr/share/weewx/weeplot/genplot.py", line 222, in _getScaledDraw >>> Sep 25 06:26:19 hub-pi weewx[436]: **** ((self.xscale[0], >>> self.yscale[0]), (self.xscale[1], self.yscale[1]))) >>> Sep 25 06:26:19 hub-pi weewx[436]: **** File >>> "/usr/share/weewx/weeplot/utilities.py", line 317, in __init__ >>> Sep 25 06:26:19 hub-pi weewx[436]: **** self.yscale = >>> -float(lri[1] - uli[1]) / float(urs[1] - lls[1]) >>> Sep 25 06:26:19 hub-pi weewx[436]: **** ZeroDivisionError: >>> float division by zero >>> Sep 25 06:26:19 hub-pi weewx[436]: **** Generator terminated >>> Sep 25 06:26:19 hub-pi weewx[436]: copygenerator: copied 0 files to >>> /var/www/html/weewx >>> >>> >>> Here's the relevant section from the skin.conf: >>> [[[dayhum]]] >>> yscale = None, 100, None >>> [[[[outHumidity]]]] >>> >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "weewx-user" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to weewx-user+unsubscr...@googlegroups.com. >>> For more options, visit https://groups.google.com/d/optout. >>> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "weewx-user" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/weewx-user/H1C8sLDALWs/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> weewx-user+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. >> > -- > You received this message because you are subscribed to the Google Groups > "weewx-user" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to weewx-user+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
# # Copyright (c) 2009-2015 Tom Keffer <tkef...@gmail.com> # # See the file LICENSE.txt for your full rights. # """Various utilities used by the plot package. """ try: from PIL import ImageFont, ImageColor except ImportError: import ImageFont, ImageColor import datetime import time import math import weeplot def scale(fmn, fmx, prescale = (None, None, None), nsteps = 10): """Calculates an appropriate min, max, and step size for scaling axes on a plot. The origin (zero) is guaranteed to be on an interval boundary. fmn: The minimum data value fmx: The maximum data value. Must be greater than or equal to fmn. prescale: A 3-way tuple. A non-None min or max value (positions 0 and 1, respectively) will be fixed to that value. A non-None interval (position 2) be at least as big as that value. Default = (None, None, None) nsteps: The nominal number of desired steps. Default = 10 Returns: a three-way tuple. First value is the lowest scale value, second the highest. The third value is the step (increment) between them. Examples: >>> print "(%.1f, %.1f, %.1f)" % scale(1.1, 12.3, (0, 14, 2)) (0.0, 14.0, 2.0) >>> print "(%.1f, %.1f, %.1f)" % scale(1.1, 12.3) (0.0, 14.0, 2.0) >>> print "(%.1f, %.1f, %.1f)" % scale(-1.1, 12.3) (-2.0, 14.0, 2.0) >>> print "(%.1f, %.1f, %.1f)" % scale(-12.1, -5.3) (-13.0, -5.0, 1.0) >>> print "(%.2f, %.2f, %.2f)" % scale(10.0, 10.0) (10.00, 10.10, 0.01) >>> print "(%.4f, %.4f, %.5f)" % scale(10.0, 10.001) (10.0000, 10.0010, 0.00010) >>> print "(%.2f, %.2f, %.2f)" % scale(10.0, 10.0+1e-8) (10.00, 10.10, 0.01) >>> print "(%.2f, %.2f, %.2f)" % scale(0.0, 0.05, (None, None, .1), 10) (0.00, 1.00, 0.10) >>> print "(%.2f, %.2f, %.2f)" % scale(16.8, 21.5, (None, None, 2), 10) (16.00, 36.00, 2.00) >>> print "(%.2f, %.2f, %.2f)" % scale(16.8, 21.5, (None, None, 2), 4) (16.00, 22.00, 2.00) >>> print "(%.2f, %.2f, %.2f)" % scale(0.0, 0.21, (None, None, .02)) (0.00, 0.22, 0.02) >>> print "(%.2f, %.2f, %.2f)" % scale(100.0, 100.0, (None, 100, None)) (99.00, 100.00, 0.20) >>> print "(%.2f, %.2f, %.2f)" % scale(100.0, 100.0, (100, None, None)) (100.00, 101.00, 0.20) """ # If all the values are hard-wired in, then there's nothing to do: if None not in prescale: return prescale (minscale, maxscale, min_interval) = prescale # Make sure fmn and fmx are float values, in case a user passed # in integers: fmn = float(fmn) fmx = float(fmx) if fmx < fmn : raise weeplot.ViolatedPrecondition("scale() called with max value less than min value") # In case minscale and/or maxscale was specified, clip fmn and fmx to make sure they stay within bounds if maxscale is not None: fmx = min(fmx, maxscale) if minscale is not None: fmn = max(fmn, minscale) # Check the special case where the min and max values are equal. if _rel_approx_equal(fmn, fmx) : # They are equal. We need to move one or the other to create a range, while # being careful that the resultant min/max stay within the interval [minscale, maxscale] if maxscale is not None: # maxscale if fixed. Move fmn. fmn = fmx - 0.01 * abs(fmx) elif minscale is not None: # minscale if fixed. Move fmx. fmx = fmn + 0.01 * abs(fmx) else: # Both can float. Check special case where fmn and fmx are zero if fmn == 0.0 : fmx = 1.0 else : # Just arbitrarily move one. Say, fmx. fmx = fmn + .01*abs(fmn) if minscale is not None and maxscale is not None: if maxscale < minscale: raise weeplot.ViolatedPrecondition("scale() called with prescale max less than min") frange = maxscale - minscale else: frange = fmx - fmn steps = frange / nsteps mag = math.floor(math.log10(steps)) magPow = math.pow(10.0, mag) magMsd = math.floor(steps/magPow + 0.5) if magMsd > 5.0: magMsd = 10.0 elif magMsd > 2.0: magMsd = 5.0 else : # magMsd > 1.0 magMsd = 2 # This will be the nominal interval size interval = magMsd * magPow # Test it against the desired minimum, if any if min_interval is None or interval >= min_interval: # Either no min interval was specified, or its safely # less than the chosen interval. if minscale is None: minscale = interval * math.floor(fmn / interval) if maxscale is None: maxscale = interval * math.ceil(fmx / interval) else: # The request for a minimum interval has kicked in. # Sometimes this can make for a plot with just one or # two intervals in it. Adjust the min and max values # to get a nice plot interval = float(min_interval) if minscale is None: if maxscale is None: # Both can float. Pick values so the range is near the bottom # of the scale: minscale = interval * math.floor(fmn / interval) maxscale = minscale + interval * nsteps else: # Only minscale can float minscale = maxscale - interval * nsteps else: if maxscale is None: # Only maxscale can float maxscale = minscale + interval * nsteps else: # Both are fixed --- nothing to be done pass return (minscale, maxscale, interval) def scaletime(tmin_ts, tmax_ts) : """Picks a time scaling suitable for a time plot. tmin_ts, tmax_ts: The time stamps in epoch time around which the times will be picked. Returns a scaling 3-tuple. First element is the start time, second the stop time, third the increment. All are in seconds (epoch time in the case of the first two). Example 1: 24 hours on an hour boundary >>> from weeutil.weeutil import timestamp_to_string as to_string >>> time_ts = time.mktime(time.strptime("2013-05-17 08:00", "%Y-%m-%d %H:%M")) >>> xmin, xmax, xinc = scaletime(time_ts - 24*3600, time_ts) >>> print to_string(xmin), to_string(xmax), xinc 2013-05-16 09:00:00 PDT (1368720000) 2013-05-17 09:00:00 PDT (1368806400) 10800 Example 2: 24 hours on a 3-hour boundary >>> time_ts = time.mktime(time.strptime("2013-05-17 09:00", "%Y-%m-%d %H:%M")) >>> xmin, xmax, xinc = scaletime(time_ts - 24*3600, time_ts) >>> print to_string(xmin), to_string(xmax), xinc 2013-05-16 09:00:00 PDT (1368720000) 2013-05-17 09:00:00 PDT (1368806400) 10800 Example 3: 24 hours on a non-hour boundary >>> time_ts = time.mktime(time.strptime("2013-05-17 09:01", "%Y-%m-%d %H:%M")) >>> xmin, xmax, xinc = scaletime(time_ts - 24*3600, time_ts) >>> print to_string(xmin), to_string(xmax), xinc 2013-05-16 12:00:00 PDT (1368730800) 2013-05-17 12:00:00 PDT (1368817200) 10800 Example 4: 27 hours >>> time_ts = time.mktime(time.strptime("2013-05-17 07:45", "%Y-%m-%d %H:%M")) >>> xmin, xmax, xinc = scaletime(time_ts - 27*3600, time_ts) >>> print to_string(xmin), to_string(xmax), xinc 2013-05-16 06:00:00 PDT (1368709200) 2013-05-17 09:00:00 PDT (1368806400) 10800 Example 5: 3 hours on a 15 minute boundary >>> time_ts = time.mktime(time.strptime("2013-05-17 07:45", "%Y-%m-%d %H:%M")) >>> xmin, xmax, xinc = scaletime(time_ts - 3*3600, time_ts) >>> print to_string(xmin), to_string(xmax), xinc 2013-05-17 05:00:00 PDT (1368792000) 2013-05-17 08:00:00 PDT (1368802800) 900 Example 6: 3 hours on a non-15 minute boundary >>> time_ts = time.mktime(time.strptime("2013-05-17 07:46", "%Y-%m-%d %H:%M")) >>> xmin, xmax, xinc = scaletime(time_ts - 3*3600, time_ts) >>> print to_string(xmin), to_string(xmax), xinc 2013-05-17 05:00:00 PDT (1368792000) 2013-05-17 08:00:00 PDT (1368802800) 900 Example 7: 12 hours >>> time_ts = time.mktime(time.strptime("2013-05-17 07:46", "%Y-%m-%d %H:%M")) >>> xmin, xmax, xinc = scaletime(time_ts - 12*3600, time_ts) >>> print to_string(xmin), to_string(xmax), xinc 2013-05-16 20:00:00 PDT (1368759600) 2013-05-17 08:00:00 PDT (1368802800) 3600 Example 8: 15 hours >>> time_ts = time.mktime(time.strptime("2013-05-17 07:46", "%Y-%m-%d %H:%M")) >>> xmin, xmax, xinc = scaletime(time_ts - 15*3600, time_ts) >>> print to_string(xmin), to_string(xmax), xinc 2013-05-16 17:00:00 PDT (1368748800) 2013-05-17 08:00:00 PDT (1368802800) 7200 """ if tmax_ts <= tmin_ts : raise weeplot.ViolatedPrecondition, "scaletime called with tmax <= tmin" tdelta = tmax_ts - tmin_ts tmin_dt = datetime.datetime.fromtimestamp(tmin_ts) tmax_dt = datetime.datetime.fromtimestamp(tmax_ts) if tdelta <= 16 * 3600: if tdelta <= 3*3600: # For time intervals less than 3 hours, use an increment of 15 minutes interval = 900 elif tdelta <= 12 * 3600: # For intervals from 3 hours up through 12 hours, use one hour interval = 3600 else: # For intervals from 12 through 16 hours, use two hours. interval = 7200 # Get to the one hour boundary below tmax: stop_dt = tmax_dt.replace(minute=0, second=0, microsecond=0) # if tmax happens to be on a one hour boundary we're done. Otherwise, round # up to the next one hour boundary: if tmax_dt > stop_dt: stop_dt += datetime.timedelta(hours=1) n_hours = int((tdelta + 3599) / 3600) start_dt = stop_dt - datetime.timedelta(hours=n_hours) elif tdelta <= 27 * 3600: # A day plot is wanted. A time increment of 3 hours is appropriate interval = 3 * 3600 # h is the hour of tmax_dt h = tmax_dt.timetuple()[3] # Subtract off enough to get to the lower 3-hour boundary from tmax: stop_dt = tmax_dt.replace(minute=0, second=0, microsecond=0) - datetime.timedelta(hours = h % 3) # If tmax happens to lie on a 3 hour boundary we don't need to do anything. If not, we need # to round up to the next 3 hour boundary: if tmax_dt > stop_dt: stop_dt += datetime.timedelta(hours=3) # The stop time is one day earlier start_dt = stop_dt - datetime.timedelta(days=1) if tdelta == 27 * 3600 : # A "slightly more than a day plot" is wanted. Start 3 hours earlier: start_dt -= datetime.timedelta(hours=3) elif 27 * 3600 < tdelta <= 31 * 24 * 3600 : # The time scale is between a day and a month. A time increment of one day is appropriate start_dt = tmin_dt.replace(hour=0, minute=0, second=0, microsecond=0) stop_dt = tmax_dt.replace(hour=0, minute=0, second=0, microsecond=0) tmax_tt = tmax_dt.timetuple() if tmax_tt[3]!=0 or tmax_tt[4]!=0 : stop_dt += datetime.timedelta(days=1) interval = 24 * 3600 elif tdelta < 2 * 365.25 * 24 * 3600 : # The time scale is between a month and 2 years. A time increment of a month is appropriate start_dt = tmin_dt.replace(day=1, hour=0, minute=0, second=0, microsecond=0) (year , mon, day) = tmax_dt.timetuple()[0:3] if day != 1 : mon += 1 if mon==13 : mon = 1 year += 1 stop_dt = datetime.datetime(year, mon, 1) # Average month length: interval = 365.25/12 * 24 * 3600 else : # The time scale is between a month and 2 years. A time increment of a year is appropriate start_dt = tmin_dt.replace(day=1, hour=0, minute=0, second=0, microsecond=0) (year , mon, day) = tmax_dt.timetuple()[0:3] if day != 1 or mon !=1 : day = 1 mon = 1 year += 1 stop_dt = datetime.datetime(year, mon, 1) # Average year length interval = 365.25 * 24 * 3600 # Convert to epoch time stamps start_ts = int(time.mktime(start_dt.timetuple())) stop_ts = int(time.mktime(stop_dt.timetuple())) return (start_ts, stop_ts, interval) class ScaledDraw(object): """Like an ImageDraw object, but lines are scaled. """ def __init__(self, draw, imagebox, scaledbox): """Initialize a ScaledDraw object. Example: scaledraw = ScaledDraw(draw, ((10, 10), (118, 246)), ((0.0, 0.0), (10.0, 1.0))) would create a scaled drawing where the upper-left image coordinate (10, 10) would correspond to the scaled coordinate( 0.0, 1.0). The lower-right image coordinate would correspond to the scaled coordinate (10.0, 0.0). draw: an instance of ImageDraw imagebox: a 2-tuple of the box coordinates on the image ((ulx, uly), (lrx, lry)) scaledbox: a 2-tuple of the box coordinates of the scaled plot ((llx, lly), (urx, ury)) """ uli = imagebox[0] lri = imagebox[1] lls = scaledbox[0] urs = scaledbox[1] if urs[1] == lls[1]: pass self.xscale = float(lri[0] - uli[0]) / float(urs[0] - lls[0]) self.yscale = -float(lri[1] - uli[1]) / float(urs[1] - lls[1]) self.xoffset = int(lri[0] - urs[0] * self.xscale + 0.5) self.yoffset = int(uli[1] - urs[1] * self.yscale + 0.5) self.draw = draw def line(self, x, y, line_type='solid', marker_type=None, marker_size=8, maxdx=None, **options) : """Draw a scaled line on the instance's ImageDraw object. x: sequence of x coordinates y: sequence of y coordinates, some of which are possibly null (value of None) line_type: 'solid' for line that connect the coordinates None for no line marker_type: None or 'none' for no marker. 'cross' for a cross 'circle' for a circle 'box' for a box 'x' for an X maxdx: defines what constitutes a gap in samples. if two data points are more than maxdx apart they are treated as separate segments. For a scatter plot, set line_type to None and marker_type to something other than None. """ # Break the line up around any nulls or gaps between samples for xy_seq in xy_seq_line(x, y, maxdx): # Create a list with the scaled coordinates... xy_seq_scaled = [(self.xtranslate(xc), self.ytranslate(yc)) for (xc,yc) in xy_seq] if line_type == 'solid': # Now pick the appropriate drawing function, depending on the length of the line: if len(xy_seq) == 1 : self.draw.point(xy_seq_scaled, fill=options['fill']) else : self.draw.line(xy_seq_scaled, **options) if marker_type and marker_type.lower().strip() not in ['none', '']: self.marker(xy_seq_scaled, marker_type, marker_size=marker_size, **options) def marker(self, xy_seq, marker_type, marker_size=10, **options): half_size = marker_size/2 marker=marker_type.lower() for x, y in xy_seq: if marker == 'cross': self.draw.line([(x-half_size, y), (x+half_size, y)], **options) self.draw.line([(x, y-half_size), (x, y+half_size)], **options) elif marker == 'x': self.draw.line([(x-half_size, y-half_size), (x+half_size, y+half_size)], **options) self.draw.line([(x-half_size, y+half_size), (x+half_size, y-half_size)], **options) elif marker == 'circle': self.draw.ellipse([(x-half_size, y-half_size), (x+half_size, y+half_size)], outline=options['fill']) elif marker == 'box': self.draw.line([(x-half_size, y-half_size), (x+half_size, y-half_size), (x+half_size, y+half_size), (x-half_size, y+half_size), (x-half_size, y-half_size)], **options) def rectangle(self, box, **options) : """Draw a scaled rectangle. box: A pair of 2-way tuples, containing coordinates of opposing corners of the box. options: passed on to draw.rectangle. Usually contains 'fill' (the color) """ box_scaled = [(coord[0]*self.xscale + self.xoffset + 0.5, coord[1]*self.yscale + self.yoffset + 0.5) for coord in box] self.draw.rectangle(box_scaled, **options) def vector(self, x, vec, vector_rotate, **options): if vec is None: return xstart_scaled = self.xtranslate(x) ystart_scaled = self.ytranslate(0) vecinc_scaled = vec * self.yscale if vector_rotate: vecinc_scaled *= complex(math.cos(math.radians(vector_rotate)), math.sin(math.radians(vector_rotate))) # Subtract off the x increment because the x-axis # *increases* to the right, unlike y, which increases # downwards xend_scaled = xstart_scaled - vecinc_scaled.real yend_scaled = ystart_scaled + vecinc_scaled.imag self.draw.line(((xstart_scaled, ystart_scaled), (xend_scaled, yend_scaled)), **options) def xtranslate(self, x): return int(x * self.xscale + self.xoffset + 0.5) def ytranslate(self, y): return int(y * self.yscale + self.yoffset + 0.5) def xy_seq_line(x, y, maxdx=None): """Generator function that breaks a line up into individual segments around any nulls held in y or any gaps in x greater than maxdx. x: iterable sequence of x coordinates. All values must be non-null y: iterable sequence of y coordinates, possibly with some embedded nulls (that is, their value==None) yields: Lists of (x,y) coordinates Example 1 >>> x=[ 1, 2, 3] >>> y=[10, 20, 30] >>> for xy_seq in xy_seq_line(x,y): ... print xy_seq [(1, 10), (2, 20), (3, 30)] Example 2 >>> x=[0, 1, 2, 3, 4, 5, 6, 7, 8, 9] >>> y=[0, 10, None, 30, None, None, 60, 70, 80, None] >>> for xy_seq in xy_seq_line(x,y): ... print xy_seq [(0, 0), (1, 10)] [(3, 30)] [(6, 60), (7, 70), (8, 80)] Example 3 >>> x=[ 0 ] >>> y=[None] >>> for xy_seq in xy_seq_line(x,y): ... print xy_seq Example 4 >>> x=[ 0, 1, 2] >>> y=[None, None, None] >>> for xy_seq in xy_seq_line(x,y): ... print xy_seq Example 5 (using gap) >>> x=[0, 1, 2, 3, 5.1, 6, 7, 8, 9] >>> y=[0, 10, 20, 30, 50, 60, 70, 80, 90] >>> for xy_seq in xy_seq_line(x,y,2): ... print xy_seq [(0, 0), (1, 10), (2, 20), (3, 30)] [(5.1, 50), (6, 60), (7, 70), (8, 80), (9, 90)] """ line = [] last_x = None for xy in zip(x, y): dx = xy[0] - last_x if last_x is not None else 0 last_x = xy[0] # If the y coordinate is None or dx > maxdx, that marks a break if xy[1] is None or (maxdx is not None and dx > maxdx): # If the length of the line is non-zero, yield it if len(line): yield line line = [] if xy[1] is None else [xy] else: line.append(xy) if len(line): yield line def pickLabelFormat(increment): """Pick an appropriate label format for the given increment. Examples: >>> print pickLabelFormat(1) %.0f >>> print pickLabelFormat(20) %.0f >>> print pickLabelFormat(.2) %.1f >>> print pickLabelFormat(.01) %.2f """ i_log = math.log10(increment) if i_log < 0 : i_log = abs(i_log) decimal_places = int(i_log) if i_log != decimal_places : decimal_places += 1 else : decimal_places = 0 return "%%.%df" % decimal_places def get_font_handle(fontpath, *args): font_key = (fontpath, args) if font_key in get_font_handle.fontCache: return get_font_handle.fontCache[font_key] font = None if fontpath is not None : try : if fontpath.endswith('.ttf'): font = ImageFont.truetype(fontpath, *args) else : font = ImageFont.load_path(fontpath) except IOError : pass if font is None : font = ImageFont.load_default() if font is not None : get_font_handle.fontCache[font_key] = font return font get_font_handle.fontCache={} def _rel_approx_equal(x, y, rel=1e-7): """Relative test for equality. Example >>> _rel_approx_equal(1.23456, 1.23457) False >>> _rel_approx_equal(1.2345678, 1.2345679) True >>> _rel_approx_equal(0.0, 0.0) True >>> _rel_approx_equal(0.0, 0.1) False >>> _rel_approx_equal(0.0, 1e-9) False >>> _rel_approx_equal(1.0, 1.0+1e-9) True >>> _rel_approx_equal(1e8, 1e8+1e-3) True """ return abs(x-y) <= rel*max(abs(x), abs(y)) def tobgr(x): """Convert a color to little-endian integer. The PIL wants either a little-endian integer (0xBBGGRR) or a string (#RRGGBB). weewx expects little-endian integer. Accept any standard color format that is known by ImageColor for example #RGB, #RRGGBB, hslHSL as well as standard color names from X11 and CSS3. See ImageColor for complete set of colors. """ if isinstance(x, basestring): if x.startswith('0x'): return int(x, 0) try: (r,g,b) = ImageColor.getrgb(x) return r + g*256 + b*256*256 except : pass try: return int(x) except ValueError: pass raise ValueError("Unknown color specifier: '%s'. Colors must be specified as 0xBBGGRR, #RRGGBB, or standard color names." % x) return x if __name__ == "__main__": import doctest if not doctest.testmod().failed: print "PASSED"