Thread: [Matplotlib-users] Label text alignment problem?

    Hello again,

     I've created some axes, and I'm trying to put some custom Ox tick
labels on the axes. I would also like to have different alignments for
each tick label. This is the code I'm using (with matplotlib.0.61.0a
on Win32 with the WXAgg backend):

        self.axes.set_xticks( [0, 1, 2, 3 ])
        th = self.axes.set_xticklabels( ['12:23:000', '+4s', '+8s', '+12s' ] )
        th[ 0 ].set_horizontalalignment( 'left' )
        th[ 1 ].set_horizontalalignment( 'center' )
        th[ 2 ].set_horizontalalignment( 'center' )
        th[ 3 ].set_horizontalalignment( 'right' )

    But it seems that all the tick labels have the last set alignment
(in this case 'right'). Is this a bug, or am I just missing something
as usual?
    Thank you.

-- 
Bogdan

>>>>> "Bogdan" == Bogdan Marinescu <bog...@gm...> writes:

    Bogdan>     Hello again, I've created some axes, and I'm trying to
    Bogdan> put some custom Ox tick labels on the axes. I would also
    Bogdan> like to have different alignments for each tick
    Bogdan> label. This is the code I'm using (with matplotlib.0.61.0a
    Bogdan> on Win32 with the WXAgg backend):

Hi, I thought we had lost you to PyPlot :-)

Egads, that was a tough one.  Every once in a while when developing
I'll make a temporary change in the src code for experimental purposes
and forget to undo it.  This is one of those cases.  In
matplotlib.axis.XAxis, on or around line 575, find the line that reads

                #tick = self._get_tick(major=True)
                tick = protoTick

and replace it with 

                tick = self._get_tick(major=True)

The assignment 'tick = protoTick' was causing all ticks to share
properties.

FYI, matplotlib has a fairly general and extensible tick locator and
formatter framework, which you can read about in
http://matplotlib.sf.net/matplotlib.ticker.html and in the examples
custom_ticker1.py, major_minor_demo1.py and major_minor_demo2.py in
the matplotlib src distribution or at
http://matplotlib.sf.net/examples.  The set_ticks, set_ticklabels,
etc, commands are just wrappers for these classes.


JDH

    Thank you, John. I thought I was lost to PyPlot too, but ... well,
matplotlib is just too cool :) So I struggled a bit and I managed to
get a print of the graph by first saving it to a file and then
printing the file. It actually woks on wxPython 2.5.2.2, I don't
expect it to work with 2.5.1.5. I imagine that some people will
benefit from this code and I'd be more than happy to give my share to
matplotlib. So please let me know how should I send my code. IF I
should send it :) I'll do it tomorrow if everything is OK, I'm
exhausted today.

On Fri, 23 Jul 2004 14:25:31 -0500, John Hunter
<jdh...@ac...> wrote:
> >>>>> "Bogdan" == Bogdan Marinescu <bog...@gm...> writes:
> 
>     Bogdan>     Hello again, I've created some axes, and I'm trying to
>     Bogdan> put some custom Ox tick labels on the axes. I would also
>     Bogdan> like to have different alignments for each tick
>     Bogdan> label. This is the code I'm using (with matplotlib.0.61.0a
>     Bogdan> on Win32 with the WXAgg backend):
> 
> Hi, I thought we had lost you to PyPlot :-)
> 
> Egads, that was a tough one.  Every once in a while when developing
> I'll make a temporary change in the src code for experimental purposes
> and forget to undo it.  This is one of those cases.  In
> matplotlib.axis.XAxis, on or around line 575, find the line that reads
> 
>                 #tick = self._get_tick(major=True)
>                 tick = protoTick
> 
> and replace it with
> 
>                 tick = self._get_tick(major=True)
> 
> The assignment 'tick = protoTick' was causing all ticks to share
> properties.
> 
> FYI, matplotlib has a fairly general and extensible tick locator and
> formatter framework, which you can read about in
> http://matplotlib.sf.net/matplotlib.ticker.html and in the examples
> custom_ticker1.py, major_minor_demo1.py and major_minor_demo2.py in
> the matplotlib src distribution or at
> http://matplotlib.sf.net/examples.  The set_ticks, set_ticklabels,
> etc, commands are just wrappers for these classes.
> 
> JDH
> 
> 


-- 
Bogdan

>>>>> "Bogdan" == Bogdan Marinescu <bog...@gm...> writes:

    Bogdan>     Thank you, John. I thought I was lost to PyPlot too,
    Bogdan> but ... well, matplotlib is just too cool :) So I
    Bogdan> struggled a bit and I managed to get a print of the graph
    Bogdan> by first saving it to a file and then printing the
    Bogdan> file. It actually woks on wxPython 2.5.2.2, I don't expect
    Bogdan> it to work with 2.5.1.5. I imagine that some people will
    Bogdan> benefit from this code and I'd be more than happy to give
    Bogdan> my share to matplotlib. So please let me know how should I
    Bogdan> send my code. IF I should send it :) I'll do it tomorrow
    Bogdan> if everything is OK, I'm exhausted today.

Definitely send the code.  If it's not too big, just post it to the
list.  Pasting in the code is better than attachments because the
sourceforge archiver drops attachments (but be careful that the lines
don't wrap).  If the code is too long, you can send it to me and I'll
include a link to it on the web site.

Thanks,
John

    Hi John,

    I'm sending the code as an attachement, as it is 215 lines long
and some of them could wrap. Some thoughts about the code: in order to
test it just modify the definitions of IMAGE_FILE and (maybe)
PRINT_DPI. Then start the program and use "print" and "preview" from
the "file" menu. The preview doesn't look like the original plot (at
least on the machines I tested it), and I don't know why. The colors
seem to be twisted or something in the preview. If somebody has any
clues about this, I'd be more than happy to know. However, this is
only a preview problem, the print itself looks fine. Don't expect the
code to run on the current "official" version of wxPython (2.5.1.5);
download the 2.5.2.2 test release (or a more recent version) from
http://starship.python.net/crew/robind/wxPython/daily/20040722/. Only
tested on WinXP and Win2000 with the WXAgg backend, I don't know
anything about the other platforms or backends, if someone else could
test this it would be great. This could certainly be improved by
telling the backend what wxDC it should use to draw the image on (thus
skipping the save image/load image step), but so far I believe this is
a good solution.
    John, I have some comments on the wx / wxAgg backends; I've been
able to totally eliminate the very annoying flicker that I got when
moving a window on a plot canvas. I guess that the dev list would be a
better place for these comments, right?

-- 
Bogdan