Re: [Matplotlib-users] Date plotting

[Al S. <a.d...@wo...>]

One way to avoid having the minor ticklabels collide with the major ones
is to put them on separate lines as illustrated in the original post.
Supporting multi-line text (embedded '\n's in ticklabels) would permit
this.  All you would have to do is begin the minor ticklabels with one
or more '\n's.  How is this coming along?

	-Al

On Sat, 2004-05-08 at 08:47, John Hunter wrote:
> >>>>> "Steve" == Steve Chaplin <ste...@ya...> writes:
> 
>     Steve> John, I've just started using the new tick locating,
>     Steve> formatting and date plotting and noticed if you want to
>     Steve> show day of month, month and year its quite easy to end up
>     Steve> with major and minor tick labels overwriting each other.
>     Steve> Is there a way to draw the major tick label underneath the
>     Steve> minor tick label so they're not competing for the same
>     Steve> space?
> 
> There are a few ways to go here.  First of all, with no change to the
> code, you can set the tick positions of the minor tick labels as
> follow.  I'm just winging this code so apologies if there is a minor
> mistake somewhere
> 
> ax = subplot(111)
> 
> #your plot here
> for tick in ax.xaxis.get_minor_ticks():
>     tick.label1.set_y(-0.1)
> 
> Note that the y coord of the x tick label is in axes coordinates,
> where 0 is the bottom and 1 is the top of the axes, so -0.1 is 10%
> below the bottom of the axes.  label1 and label2 are the bottom and
> top label text.Text instances (this is a recent feature to support
> left/right labeling or top/bottom tick labeling) so you can call any
> of the Text methods on them.
> 
> Note this code only affects the current ticks, so if you were doing
> interactive navigation and zoomed out, thereby creating new minor
> ticks, the new minor ticks would have their default locations (but I
> can fix this fairly easily by updating the copy properties function
> that transfers old tick properties to new ones when ticks are created
> during interaction).
> 
> There is an additional consideration.  Currently, the tick drawing
> code will skip a minor tick if a major tick has already been drawn at
> that exact location.  In axis.py there is a line in the axis drawing
> code that reads
> 
>             if seen.has_key(loc): continue
> 
> where seen is a dict that has a key if the tick location loc was drawn
> by the major tick drawing code.  We could add an attribute, something
> like forceDraw, to the tick and modify this code so that you could do
> 
>             if not tick.forceDraw and seen.has_key(loc): continue
> 
> and in your code
> 
> for tick in ax.xaxis.get_minor_ticks():
>     tick.forceDraw = True
>     tick.label1.set_y(-0.1)
> 
> Let me know how this works for you.
> 
> We could automate this a bit if you think it's worthwhile, eg by
> setting a 'draw under' flag for the minor ticks, getting the bounding
> boxes of the major ticks in the axis drawing code, and setting the
> offsets automagically.  This would have the dual advantages of working
> in the presence of changes in font size, interaction, etc.  The
> question is whether it's sufficiently common to justify the extra work
> or if the manual control approach above suffices.  If you want to add
> this feature, I can get you some additional pointers to code showing
> how to get the bounding box of all the major tick labels and using
> this to control the positioning of the minor tick labels.
> 
> JDH
> 
> 
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