matplotlib-users Mailing List for matplotlib

Pavol Severa wrote:
> Hello
> 
> I'd like to ask you how to make the ticks on the axes to protrude out
> of the picture (I have a picture with some dark areas where the ticks
> are virtually invisible; if the ticks were at least partially outside,
> it would solve the problem).

Pavol,

In your matplotlibrc file you can set the tick direction:

...
xtick.direction      : in     # direction: in or out
...
ytick.direction      : in     # direction: in or out
...

Alternatively, interactively or within a script you can use:

rcParams['xtick.direction'] = 'out'
rcParams['ytick.direction'] = 'out'

Eric

I would like to create an animation that shows the path of a vehicle  
moving
along a trajectory. The vehicle could be represented by a small  
circle with and arrow
pointing along the vehicle's current heading. It would be nice to  
leave a bread crumb trail
of the vehicles path as a line.

I found documentation on making animations and movies but plotting a  
sequence of plots.
But I am not sure how I create or plot the circle plus arrow and then  
move it for the next plot.
(unless I just replot the whole plot everyframe) The Animation  
cookbook apparently provides
some hints but I am a little lost as to where to begin.

Do I need to create an artist? or a cursor?
I am using WxAgg on Mac Os X 10.4.4 although I could use another OS X  
supported backend if
it would be easier than WXAgg.

Any hints or a get started example

Sam

Darrel,

I this other thread you mention recent changes to the tex font  
handling. I am assuming that these are not in the 0.86.2 distribution?
Is this related to my poor resolution problem?

> I made some improvements to the usetex option over the last few  
> days in order
> to make font selection fit seemlessly with the rest of Matplotlib.  
> The usetex
> option will now respect the serif, sans-serif, monospace, and  
> cursive rc
> settings. Usetex looks until it finds a latex-compatible font, or  
> defaults to
> computer modern. Proper font support with plainTeX is more  
> difficult, and
> everyone seems to use the latex backend anyway, so I am dropping  
> support of
> the tex engine. With these changes, the font.latex.package and the
> text.tex.engine rc settings are no longer needed, and should be  
> removed from
> ones personal matplotlibrc file.

Hello NG,

I am having a couple of problems with Matplotlib embedded in wxPython; both
are related to the Pylab twinx() function and its corresponding Matplotlib
API call.

Problem 1:
Using the following script:

----------------------------------------------
#!/usr/bin/env python

from pylab import *

ax1 = subplot(111)
t = arange(0.01, 10.0, 0.01)
s2 = sin(2*pi*t)
plot(t, s2, 'r.')
ylabel('sin')

# turn off the 2nd axes rectangle with twinx()
ax2 = twinx()
s1 = exp(t)
plot(t, s1, 'b-')
xlabel('time (s)')
ylabel('exp')

show()
----------------------------------------------

Everything works fine but the exponential factor for which the right axis
scale is multiplied ("x1e4") is positioned on the left axis, which is
clearly misleading.

Problem 2:

Using the corresponding Matplotlib API calls to use twinx() embedded in
wxPython, the same problem as above appears *and* the ylabel for the right
axis is positioned on the left axis instead: so I end up with 2 ylabels on
the same axis. The script I am running is this one:

----------------------------------------------
#!/usr/bin/env python

import wx

import matplotlib

matplotlib.use('WXAgg')

from matplotlib.backends.backend_wxagg import \
     FigureCanvasWxAgg as FigureCanvas
from matplotlib.figure import Figure
from matplotlib.numerix import arange, sin, exp, pi

# wxPython part
app = wx.PySimpleApp()
frame = wx.Frame(None, -1, "MPL Test", (400, 400))

fig = Figure()
canvas = FigureCanvas(frame, -1, fig)

sizer = wx.BoxSizer(wx.VERTICAL)
sizer.Add(canvas, 1, wx.LEFT|wx.TOP|wx.GROW)
frame.SetSizer(sizer)
sizer.Layout()

# Plotting part: Left Axis
leftaxis = fig.add_subplot(111)
leftaxis.yaxis.tick_left()

t = arange(0.01, 10.0, 0.01)
s2 = sin(2*pi*t)
leftaxis.plot(t, s2, 'r.')
leftaxis.set_ylabel('sin')

# Plotting part: Left Axis
rightaxis = fig.add_subplot(111, frameon=False)
rightaxis.yaxis.tick_right()

s1 = exp(t)
rightaxis.plot(t, s1, 'b-')
rightaxis.set_xlabel('time (s)')
rightaxis.set_ylabel('exp')

# wxPython starts
frame.CenterOnScreen()
frame.Show()

app.MainLoop()

----------------------------------------------

If that matters, I am using Matplotlib 0.86.2 on Windows XP/2000, Python
2.4.1, wxPython 2.6.2.1.

Thanks in advance for every hint.

Andrea.

"Imagination Is The Only Weapon In The War Against Reality."
http://xoomer.virgilio.it/infinity77

On 03 Feb, 2006, at 16:43, Darren Dale wrote:

> Try setting your ps.distiller.res rc setting to 6000. Does that  
> help? If so,
> let me know and I will make a comment on the wiki.

These are my ps backend settings
I tried False, Ghostscript, and xpdf for the ps.usedistiller but no  
change in the onscreen output
in every case ps.distiller.res was set to 6000

# ps backend params
ps.papersize      : letter   # executive, letter, legal, ledger, A0- 
A10, B0-B6, C0-C6
ps.useafm         : False    # use of afm fonts -- breaks mathtext  
but results in small files
ps.usedistiller   : xpdf    # can be: None, ghostscript or xpdf
                                           # Experimental: may  
produce smaller files.
                                           # xpdf intended for  
production of publication quality files,
                                           # but requires  
ghostscript, xpdf and ps2eps
ps.distiller.res  : 6000      # dpi


I set verbose level to debug.
Here is the console output when I run the tex demo.
It seems that it is not using a tex font on screen even though usetex  
is true. It appears to use a tex font in the eps file

I get this output
numerix numpy 0.9.5.2006
font search path ['/Library/Frameworks/Python.framework/Versions/2.4/ 
lib/python2.4/site-packages/matplotlib-0.86.2cvs-py2.4-macosx-10.4- 
ppc.egg/matplotlib/mpl-data']
trying fontname /Library/Frameworks/Python.framework/Versions/2.4/lib/ 
python2.4/site-packages/matplotlib-0.86.2cvs-py2.4-macosx-10.4- 
ppc.egg/matplotlib/mpl-data/Vera.ttf
$HOME=/Users/smithsm
CONFIGDIR=/Users/smithsm/.matplotlib
loaded ttfcache file /Users/smithsm/.matplotlib/ttffont.cache
matplotlib data path /Library/Frameworks/Python.framework/Versions/ 
2.4/lib/python2.4/site-packages/matplotlib-0.86.2cvs-py2.4- 
macosx-10.4-ppc.egg/matplotlib/mpl-data
backend WXAgg version 2.6.2.1
         findfont failed New Century Schoolbook
         findfont failed Century Schoolbook L
         findfont failed Utopia
         findfont failed ITC Bookman
         findfont failed Bookman
         findfont found Bitstream Vera Serif, normal, normal 500,  
normal, 16.0
findfont returning /Library/Frameworks/Python.framework/Versions/2.4/ 
lib/python2.4/site-packages/matplotlib-0.86.2cvs-py2.4-macosx-10.4- 
ppc.egg/matplotlib/mpl-data/VeraSe.ttf
         findfont failed New Century Schoolbook
         findfont failed Century Schoolbook L
         findfont failed Utopia
         findfont failed ITC Bookman
         findfont failed Bookman
         findfont found Bitstream Vera Serif, normal, normal 500,  
normal, 12.0
findfont returning /Library/Frameworks/Python.framework/Versions/2.4/ 
lib/python2.4/site-packages/matplotlib-0.86.2cvs-py2.4-macosx-10.4- 
ppc.egg/matplotlib/mpl-data/VeraSe.ttf

This is dvips(k) 5.95b Copyright 2005 Radical Eye Software  
(www.radicaleye.com)
' TeX output 2006.02.03:1330' -> /tmp/ 
1d2e640b7c7d6320cb57dd91740b0da8.ps
<tex.pro><psfrag.pro><texps.pro><special.pro><color.pro>. <cmti10.pfb>
<cmbx10.pfb><cmmi10.pfb><cmsy10.pfb><cmr8.pfb><cmmi8.pfb><cmex10.pfb>
<cmsy8.pfb><cmr10.pfb>[1<1d2e640b7c7d6320cb57dd91740b0da8.eps>]

here is a pdf of the eps file

Hello

I'd like to ask you how to make the ticks on the axes to protrude out
of the picture (I have a picture with some dark areas where the ticks
are virtually invisible; if the ticks were at least partially outside,
it would solve the problem).

Hello NG,

    I was surfing over the matplotlib classes API, and I didn't find
anything about a way to connect an event like a mouse left double-click. Is
this actually possible? If this is not, is there a way to hack the
button_press_event handler in a way to discard the first click (maybe based
on a time.time() call?) and take only the second click if, say, less than 1
second is gone after the first click?

Thanks in advance for every idea.

Andrea.

"Imagination Is The Only Weapon In The War Against Reality."
http://xoomer.virgilio.it/infinity77