matplotlib-devel Mailing List for matplotlib

Anyone know how the default axes rectangle is set? The default width 
and height are apparently not the same
 >>> from pylab import *
 >>> ax=axes()
 >>> ax.get_position()
[0.125, 0.099999999999999978, 0.77500000000000002, 0.80000000000000004]
I'd like the last two numbers to be identical (say 0.8), that way I can 
be sure that a plot will have a certain aspect ratio if the figure 
dimensions have that aspect ratio.
-Jeff
-- 
Jeffrey S. Whitaker Phone : (303)497-6313
NOAA/OAR/CDC R/CDC1 FAX : (303)497-6449
325 Broadway Web : http://www.cdc.noaa.gov/~jsw
Boulder, CO, USA 80305-3328 Office: Skaggs Research Cntr 1D-124

Hi John,
I've been making spacecraft trajectory "Pork Chop Plots", a contour plot 
of a z-value (such amount of fuel required) over a range of Earth 
departure date x-values and Mars arrival date y-values.
Since I needed dates on both x and y axes, it was useful for me to factor 
out the date locator/formatter selection code from plot_date() into two 
Axes methods: xaxis_date() and yaxis_date().
The plot_date() implementation then becomes just a call to plot() followed 
by a call to xaxis_date().
My current implementation is below. Is this general-purpose enough for me 
to submit? If so, I'll make up some diff files and mail them in.
Thanks,
Michael
#===========================================================================
def xaxis_date(self, tz=None):
 """Choose date ticks and labels for the x-axis.
 = INPUT VARIABLES
 - tz The timezone to use in plotting the dates.
 Defaults to rc value.
 """
 span = self.dataLim.intervalx().span()
 locator, formatter = self.chooseDateFmt( span, tz )
 self.xaxis.set_major_locator(locator)
 self.xaxis.set_major_formatter(formatter)
#===========================================================================
def yaxis_date(self, tz=None):
 """Choose date ticks and labels for the y-axis.
 = INPUT VARIABLES
 - tz The timezone to use in plotting the dates.
 Defaults to rc value.
"""
 span = self.dataLim.intervaly().span()
 locator, formatter = self.chooseDateFmt( span, tz )
 self.yaxis.set_major_locator(locator)
 self.yaxis.set_major_formatter(formatter)
#===========================================================================
def chooseDateFmt(self, span, tz=None):
 """Chooses an appropriate date formatter and tick locator for a span.
 = INPUT VARIABLES
 - span The span of the plot data.
 - tz The timezone to use in plotting the dates.
 Defaults to rc value.
 = RETURN VALUE
 - A tuple of ( locator, formatter ) for the input span.
 """
 # The code below was copied from Axes.plot_date().
 if span==0:
 span = SEC_PER_HOUR
 minutes = span*24*60
 hours = span*24
 days = span
 weeks = span/7.
 months = span/31. # approx
 years = span/365.
 numticks = 5
 if years>numticks:
 locator = YearLocator(int(years/numticks), tz=tz) # define
 fmt = '%Y'
 elif months>numticks:
 locator = MonthLocator(tz=tz)
 fmt = '%b %Y'
 elif weeks>numticks:
 locator = WeekdayLocator(tz=tz)
 fmt = '%a, %b %d'
 elif days>numticks:
 locator = DayLocator(interval=math.ceil(days/numticks), tz=tz)
 fmt = '%b %d'
 elif hours>numticks:
 locator = HourLocator(interval=math.ceil(hours/numticks), tz=tz)
 fmt = '%H:%M\n%b %d'
 elif minutes>numticks:
 locator = MinuteLocator(interval=math.ceil(minutes/numticks), tz=tz)
 fmt = '%H:%M:%S'
 else:
 locator = MinuteLocator(tz=tz)
 fmt = '%H:%M:%S'
 formatter = DateFormatter(fmt, tz=tz)
 return locator, formatter
========================================================================
 Michael Brady Phone: 818-354-4957
 Jet Propulsion Laboratory (M/S 301-140L) Fax: 818-393-6388
 4800 Oak Grove Drive
 Pasadena, CA 91109 E-mail: Mic...@jp...
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