James,
I see that you have implemented a strategy change in axes.py for
inverted axes, with corresponding additions to the API. I don't have
strong opinions about the strategy. Keeping track of orientation via a
flag is reasonable, although I'm not positive it is better, given that
it complicates the API. My first reaction to the new API is at best
lukewarm, however, so perhaps it is worth a bit of thrashing out on the
list.
What you have now (and similarly for yaxis):
+ def invert_xaxis(self, invert=True):
+ "Invert the x-axis if 'invert' is True."
+ self._invertedx = invert
+
+ def xaxis_inverted(self):
+ 'Returns True if the x-axis is inverted.'
+ return self._invertedx
Some alternatives:
1) Attributes (could later be properties or those terrifying traits):
x_right=True or False
y_up
xdir 'right' or 'normal' or True; vs 'left' or 'reversed' or False
and similarly for ydir
2) Getters and setters:
set_xdir() with values as some selection from above
ydir() similar
set_xRight(False)
yUp(False)
Matlab uses "xdir", "reversed" etc.
I like the idea of being more descriptive, with "right"|"left" and
"up"|"down", either as values or in the function and/or attribute names.
I also thought the old scheme of xlim(5,0) was elegant; the problem was
that there and in related functions the variables should have been
called "left" and "right", not "xmin" and "xmax".
I could probably come up with more possibilities, but first I want to
see whether anyone agrees that this might be a good time to think about
API strategy and consistency.
Eric
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