[Matplotlib-users] Scale problem with shared axes
Hi, While upgrading from matplotlib 0.91.2 to 0.98.2 my software stop working properly. I had to adapt one of my function to autoscale visible lines. Basically, the modified function seems to work but when I use it on a shared axes context I run into problem. A small script in attachment illustrate the problem. Actually, the second axes which sharex with first one, prevent the first one to be scaled properly. The script works properly with matplotlib 0.91.2 but fail (autoscaling not working) using 0.98.2 Am I doing something wrong in my autoscale function while updating the axs.dataLim ? Or is it something more tricky? Thanks in advance for your help. David import matplotlib def autoscale_visible_lines(axs): """ Function to autoscale only on visible lines. """ ignore = True for line in (axs.lines): if not line.get_visible(): continue #jump to next line if this one is not visible if matplotlib.__version__ == '0.98.2': axs.dataLim.update_from_data_xy(line.get_xydata(), ignore) else: axs.dataLim.update_numerix(line.get_xdata(), line.get_ydata(), ignore) ignore = False axs.autoscale_view() return None import pylab as pl if __name__ == "__main__": axs1 = pl.subplot(111) t = pl.arange(0.01, 190.0, 0.01) s1 = pl.log(t) l11, = pl.plot(t, s1, 'b-') l12, = pl.plot(t-50, s1+10) l11.set_visible(False) l12.set_visible(True) twinx = True if twinx: axs2 = pl.gcf().add_axes(axs1.get_position(), sharex=axs1, frameon=False) l21, = pl.plot([1], [1], 'r.') autoscale_visible_lines(axs1) pl.show() - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] best way to produce many charts
Hi, John, if I run your script I found following behaviour of distinct backends in terms of memory leaks: QtAgg - ok Agg - ok GTKAgg - oh, memory leak PDF - ok, as you mentionend Hope it helps, seems it is not a problem of matplotlib?! Cheers, Florian P.S: I use matplotlib svn with following configuration: BUILDING MATPLOTLIB matplotlib: 0.98.2 python: 2.5.1 (r251:54863, Oct 5 2007, 13:36:32) [GCC 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)] platform: linux2 REQUIRED DEPENDENCIES numpy: 1.2.0.dev5283 freetype2: 9.16.3 OPTIONAL BACKEND DEPENDENCIES libpng: 1.2.15beta5 Tkinter: Tkinter: 50704, Tk: 8.4, Tcl: 8.4 wxPython: 2.8.4.0 * WxAgg extension not required for wxPython >= 2.8 Gtk+: gtk+: 2.12.0, glib: 2.14.1, pygtk: 2.12.0, pygobject: 2.14.0 Qt: Qt: 3.3.7, PyQt: 3.17.3 Qt4: Qt: 4.3.2, PyQt4: 4.3 Cairo: 1.4.0 OPTIONAL DATE/TIMEZONE DEPENDENCIES datetime: present, version unknown dateutil: matplotlib will provide pytz: 2007d OPTIONAL USETEX DEPENDENCIES dvipng: no ghostscript: 8.61 latex: 3.141592 pdftops: 3.00 EXPERIMENTAL CONFIG PACKAGE DEPENDENCIES configobj: 4.4.0 enthought.traits: 2.6b1-mpl [Edit setup.cfg to suppress the above messages] -- -- Florian Mueller Remote Sensing, Snow & Ice, Meteorology, IT Innsbruck, Austria ICQ: Skype: icephase26 - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] best way to produce many charts
> John, if I run your script I found following behaviour of distinct > backends in terms of memory leaks: > > QtAgg - ok > Agg - ok > GTKAgg - oh, memory leak > PDF - ok, as you mentionend > Hi John, I don't understand whats going on, but when I remove the Line "close(1)" from your script and use "GTKAgg" instead of "PDF" the memory leak of my previous post is gone! Cheers, Florian -- -- Florian Mueller Remote Sensing, Snow & Ice, Meteorology, IT Innsbruck, Austria ICQ: Skype: icephase26 - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] best way to produce many charts
On Thu, Jul 3, 2008 at 5:23 AM, Florian Mueller <[EMAIL PROTECTED]> wrote: > I don't understand whats going on, but when I remove the Line > "close(1)" from your script and use "GTKAgg" instead of "PDF" the > memory leak of my previous post is gone! Apparently there is a leak in the creation and destruction of the gtk pixel buffer. If you clear it with clf, instead of closing it, perhaps you aboid this leak. Just speculating. But it is good to know that it doesn't leak with a clf. JDH - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] findobj in pylab
Thanks Matthias. That is a helpful example. I have been trying to figure out how to recursively examine all the objects in fig to see if there is a particular settable property. It seems like the algorithm has to be recursive so that it goes deep into all the lists, etc. I have not figured out how to know when you have reached the bottom/end of a trail. Such a function would let me set any text property in the whole figure without needing to know if it was a text object, label, legend, etc... maybe that is not as valuable as I think it would be though. j Message: 2 Date: Wed, 2 Jul 2008 10:00:31 +0200 From: Matthias Michler <[EMAIL PROTECTED]> Subject: Re: [Matplotlib-users] findobj in pylab To: matplotlib-users@lists.sourceforge.net Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset="iso-8859-1" Hello John, I'm not sure there is a better way, but the following works for me: -- from pylab import * fig = figure() # adding some subplots / axes instances subplot(121) x = linspace(-0.5, 1.5, 10) plot(x, 0.5*x**2, 'ro', x, 0.33*x**3, 'bs') for i in [2, 4]: subplot(2,2,i) # get all axes of the figure 'fig' ... allaxes = fig.get_axes() # ... and reset their property x-limits setp(allaxes, 'xlim', (-.5, 1.5)) ax = allaxes[0] # get all lines of the axes 'ax' ... lines = ax.get_lines() # == ax.lines # ... and reset their markerfacecolor setp(lines, 'mfc', 'g') show() --- best regards Matthias On Thursday 26 June 2008 00:21:13 John Kitchin wrote: > Is there a way to find all the "axes" objects or "line" object handles > in pylab? In matlab I used to do something like A = findobj(gcf) > Allaxes = findall(a,'Type','axes') > Set(allaxes,'Fontname','Arial') > > Is there a way to do that in pylab/matplotlib? > > Thanks, > > j > > > > --- > John Kitchin > Assistant Professor > NETL-IAES Resident Institute Fellow > Doherty Hall 3112 > Department of Chemical Engineering > Carnegie Mellon University > Pittsburgh, PA 15213 > 412-268-7803 > http://kitchingroup.cheme.cmu.edu > > --- John Kitchin Assistant Professor NETL-IAES Resident Institute Fellow Doherty Hall 3112 Department of Chemical Engineering Carnegie Mellon University Pittsburgh, PA 15213 412-268-7803 http://kitchingroup.cheme.cmu.edu - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] remove() on text
On Wed, Jul 2, 2008 at 7:13 PM, Nihat <[EMAIL PROTECTED]> wrote:
> Here are my questions:
> 1. I have extended the Line2D class as I am using _nolegend_ in the label.
> I still wanted to differentiate between lines using something called id. Is
> there a better way of doing it with built-in attributes?
Nothing built into matplotlib, but python has an "id" function and the
line objects are hashable, so you probably don't need anything else.
> 2. I can remove the line but somehow the text added to the axes does not
> respond to pick events. Anybody has any thoughts?
It turns out text picking was broken in svn. When I looked at the
implementation, I saw
try:
l,b,w,h = self.get_window_extent().get_bounds()
except:
# TODO: why does this error occur
#print str(self),"error looking at get_window_extent"
return False,{}
so apparently some developer saw this was broken, hid it with a
blanket except that was silent, and forgot to get back to the TODO.
bbox.get_bounds did not survive the transform refactor, and is now
called bbox.bounds. This could of been me, thinking I would fix it
and then forgot about it, but I certainly hope not. Note to
developers: never catch all exceptions with a blanket except that
doesn't at least warn. This is fixed in svn so text picking is
working again.
> 3. The neat thing would be to add the text into the CustomLine class so
> line's label is contained in the class. Not sure how I can do it because
> text needs an axis and axis is nor associated with Line2D until you add the
> line to axis...
> 4. How can I add a constant offset like (2 pixels right, 2 pixels up) at the
> right end of the line for its text label.
This is possible, but is a little harder than it should be because to
do it elegantly you need to override a lot of methods. If we had a
proper containment API, it would be a lot easier and this is probably
something worth doing. I wrote up an example (added it to
examples/api/line_with_text.py in svn).
In general, I think it would be nice to add support for all artists
(lines, patches, whatever) to display their label. We would need to
think a little bit about the API for placing the label (eg if every
artist provides their extent, one could place the label at "upper
right" with a certain offset.
Here is the example:
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.lines as lines
import matplotlib.transforms as mtransforms
import matplotlib.text as mtext
class MyLine(lines.Line2D):
def __init__(self, *args, **kwargs):
# we'll update the position when the line data is set
self.text = mtext.Text(0, 0, '')
lines.Line2D.__init__(self, *args, **kwargs)
# we can't access the label attr until *after* the line is
# inited
self.text.set_text(self.get_label())
def set_figure(self, figure):
self.text.set_figure(figure)
lines.Line2D.set_figure(self, figure)
def set_axes(self, axes):
self.text.set_axes(axes)
lines.Line2D.set_axes(self, axes)
def set_transform(self, transform):
# 2 pixel offset
texttrans = transform + mtransforms.Affine2D().translate(2, 2)
self.text.set_transform(texttrans)
lines.Line2D.set_transform(self, transform)
def set_data(self, x, y):
if len(x):
self.text.set_position((x[-1], y[-1]))
lines.Line2D.set_data(self, x, y)
def draw(self, renderer):
# draw my label at the end of the line with 2 pixel offset
lines.Line2D.draw(self, renderer)
self.text.draw(renderer)
fig = plt.figure()
ax = fig.add_subplot(111)
x, y = np.random.rand(2, 20)
line = MyLine(x, y, mfc='red', ms=12, label='line label')
#line.text.set_text('line label')
line.text.set_color('red')
line.text.set_fontsize(16)
ax.add_line(line)
plt.show()
-
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Re: [Matplotlib-users] findobj in pylab
On Thu, Jul 3, 2008 at 8:42 AM, John Kitchin <[EMAIL PROTECTED]> wrote:
> Thanks Matthias. That is a helpful example.
>
> I have been trying to figure out how to recursively examine all the objects
> in fig to see if there is a particular settable property. It seems like the
> algorithm has to be recursive so that it goes deep into all the lists, etc.
> I have not figured out how to know when you have reached the bottom/end of a
> trail.
>
> Such a function would let me set any text property in the whole figure
> without needing to know if it was a text object, label, legend, etc... maybe
> that is not as valuable as I think it would be though.
This is a good idea, and I just added an artist method "findobj" in
svn that recursively calls get_children and implements a match
criteria (class instance or callable filter). There is also a
pyplot/pylab wrapper that operates on current figure by default. Here
is an example:
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.text as text
a = np.arange(0,3,.02)
b = np.arange(0,3,.02)
c = np.exp(a)
d = c[::-1]
fig = plt.figure()
ax = fig.add_subplot(111)
plt.plot(a,c,'k--',a,d,'k:',a,c+d,'k')
plt.legend(('Model length', 'Data length', 'Total message length'),
'upper center', shadow=True)
plt.ylim([-1,20])
plt.grid(False)
plt.xlabel('Model complexity --->')
plt.ylabel('Message length --->')
plt.title('Minimum Message Length')
# match on arbitrary function
def myfunc(x):
return hasattr(x, 'set_color')
for o in fig.findobj(myfunc):
o.set_color('blue')
# match on class instances
for o in fig.findobj(text.Text):
o.set_fontstyle('italic')
plt.show()
-
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[Matplotlib-users] away for a week
I will be on vacation until July 21st. I will have sporadic email contact so I may pop up here and there, but if I have been involved in a thread and mysteriously disappear, now you know why. JDH - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] findobj in pylab
Cool! That is exactly what I wanted to do!
j
-Original Message-
From: John Hunter [mailto:[EMAIL PROTECTED]
Sent: Thursday, July 03, 2008 10:31 AM
To: John Kitchin
Cc: matplotlib-users@lists.sourceforge.net; [EMAIL PROTECTED]
Subject: Re: [Matplotlib-users] findobj in pylab
On Thu, Jul 3, 2008 at 8:42 AM, John Kitchin <[EMAIL PROTECTED]>
wrote:
> Thanks Matthias. That is a helpful example.
>
> I have been trying to figure out how to recursively examine all the
objects
> in fig to see if there is a particular settable property. It seems like
the
> algorithm has to be recursive so that it goes deep into all the lists,
etc.
> I have not figured out how to know when you have reached the bottom/end of
a
> trail.
>
> Such a function would let me set any text property in the whole figure
> without needing to know if it was a text object, label, legend, etc...
maybe
> that is not as valuable as I think it would be though.
This is a good idea, and I just added an artist method "findobj" in
svn that recursively calls get_children and implements a match
criteria (class instance or callable filter). There is also a
pyplot/pylab wrapper that operates on current figure by default. Here
is an example:
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.text as text
a = np.arange(0,3,.02)
b = np.arange(0,3,.02)
c = np.exp(a)
d = c[::-1]
fig = plt.figure()
ax = fig.add_subplot(111)
plt.plot(a,c,'k--',a,d,'k:',a,c+d,'k')
plt.legend(('Model length', 'Data length', 'Total message length'),
'upper center', shadow=True)
plt.ylim([-1,20])
plt.grid(False)
plt.xlabel('Model complexity --->')
plt.ylabel('Message length --->')
plt.title('Minimum Message Length')
# match on arbitrary function
def myfunc(x):
return hasattr(x, 'set_color')
for o in fig.findobj(myfunc):
o.set_color('blue')
# match on class instances
for o in fig.findobj(text.Text):
o.set_fontstyle('italic')
plt.show()
-
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Re: [Matplotlib-users] Cocoa backend for embedding in Cocoa application
On Wed, Jul 2, 2008 at 3:41 PM, Barry Wark <[EMAIL PROTECTED]> wrote: > I've written the start of a Cocoa-native backend for matplotlib and > would like to submit feedback on the code and on the possibility of > including it in the standard matplotlib distribution. The backend Hey Barry, This is great and it is something we are interested in. I haven't had a chance to test it and will be away next week but I can give you some initial thoughts. In general, we want to pare down the number of backends but OS X is an important platform and there are certainly some advantages to doing native rendering. For us to accept a new backend, we need to meet the following criteria: - someone volunteers to support it. This is a multi-year commitment. Presumably this would be you. - feature complete - images, mathtext, rotated text, etc... It sounds like the only part you are unsure about is mathtext so perhaps Michael can advise. I don't think it will be too hard since Michael has designed this to work with unicode fonts if requested. - gui backends: toolbar support If you think these are doable, that would be great. If not, I think we can rework the backend infrastructure a bit to support external backend, eg an rc backend setting which points to a file that contains the backend implementation. This latter is worth doing in any case, so if you want to have a look at it > implementation is not complete (image rendering and mathtext rendering > are currently no implemented, nor are the print_* methods of the > FigureCanvas). Image rendering is trivial once I figure out how to get > the pixel data out of a matplotlib image (I just haven't investigated > the API yet). The print_* methods are also trivial (see point 1 > below). I'm not sure how to handle mathtext yet. This backend has two > major feature differences from CocoaAgg: > 2. The reason I wrote the backend was so that matplotlib could be used > seemlesslly from within a Cocoa application. Thus this backend *will > not work* without an existing NSRunLoop. It won't work from the > terminal or an IPython session. It will work from the in-progress > Cocoa frontend for IPython or from any other Cocoa application. Again > there are tradeoffs. On the positive side, figure windows are treated > like any other application window, selectable from the Window menu > etc. and matplotlib becomes a seemless part of the application. > Existing backends designed to create their own runloop (e.g. CocoaAgg > or TkAgg) cause menubar and run loop problems when used from within an > existing application. It would be possible to merge the CocoaAgg and > Cocoa backends in this regard to use the existing run loop if present. I know nothing about cocoa apps, but from the way you describe this I think there may be some confusion in how the backends should work. I will speak in terms of gtk since this is the toolkit I know best. The FigureCanvas should be a widget which is embeddable in an app (in a container or window, etc) -- the gtk figure canvas is such a widget and can be used in a gtk app and mpl knows nothing about the application or mainloop -- that part is up to the application developer. The FigureManager is basically a pylab helper class and is not meant to be used by the application developer, though I think some backends may have been designed differently (eg wx). The FigureManager creates a canvas, a toolbar and a window, and puts all the pieces together. "show" is a pylab construct that raises the active windows and starts the mainloop. So your backend *should* be designed so that it can be run from the shell, basically you need to create an application within the backend and start the mainloop with show -- this app will only be created in pylab mode on calls to new_figure_manager and show. I don't know if any of this makes sense for cocoa apps, but it is a nice feature for backends because then those of us who do not know how to build a cocoa app (and maybe don't want to learn) can still test the backend on pylab scripts and regular os x users can use your backend w/ pylab scripts. JDH - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] turn off antialiasing of text
Hi Previously antialiased text can look pretty ugly when converted to bilevel . Is it possible to turn off antialiasing of text? There seems to be no setting. I tried using the Wx backend but it antialiased, too. I am using matplotlib 0.98; tried wxPython 2.6 and 2.8, matplotlib 0.91.4. I would not mind permanently deactivating antialiasing in text.py or so. bye, Felix -- View this message in context: http://www.nabble.com/turn-off-antialiasing-of-text-tp18257145p18257145.html Sent from the matplotlib - users mailing list archive at Nabble.com. - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] turn off antialiasing of text
It's certainly not exposed as an option to the user, and I don't think there's an easy way to hack this in. We can tell freetype to give us 1-bit monochrome bitmaps, but matplotlib currently expects 8-bit greyscale, so things don't really work. It's doable, but it requires some non-trivial code changes, and this isn't an oft-requested feature. One thing you could try is generating a PDF and then converting that using a tool that has a no-antialiasing option. It should produce a better result since it's working from the glyph outlines. There may also be a way to force this in the Cairo backend (which uses Cairo for the text rendering). But I don't know much about Cairo... Cheers, Mike fkjt79 wrote: > Hi > > Previously antialiased text can look pretty ugly when converted to bilevel . > Is it possible to turn off antialiasing of text? There seems to be no > setting. I tried using the Wx backend but it antialiased, too. > > I am using matplotlib 0.98; tried wxPython 2.6 and 2.8, matplotlib 0.91.4. > > I would not mind permanently deactivating antialiasing in text.py or so. > > bye, > > Felix > -- Michael Droettboom Science Software Branch Operations and Engineering Division Space Telescope Science Institute Operated by AURA for NASA - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Python Distribution with matplotlib
Hello, today I tried to install mpl in my local home directory at work. This debian distribution is very old and I had to compile for my own. But I failed to compile pygtk (special cairo and pango) as a dependency for mpl. So I have two questions: 1. Does you have an advice to compile mpl with minimal dependencies? 2. Does anybody know a good python dirstibution including mpl? Thanks, Friedrich - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Python Distribution with matplotlib
Friedrich Hagedorn wrote: > Hello, > > today I tried to install mpl in my local home directory at work. This > debian distribution is very old and I had to compile for my own. > > But I failed to compile pygtk (special cairo and pango) as a dependency > for mpl. So I have two questions: > > 1. Does you have an advice to compile mpl with minimal dependencies? > You can copy "setup.cfg.template" to "setup.cfg" and then edit the [gui] section to disable certain GUIs. You will need at least one GUI -- TkAgg is probably going to be the easiest to get working on an older system. You will need to have Tkinter and the Tcl/Tk development headers installed, however. > 2. Does anybody know a good python dirstibution including mpl? > Enthought has one, but I have no experience with it. Cheers, Mike -- Michael Droettboom Science Software Branch Operations and Engineering Division Space Telescope Science Institute Operated by AURA for NASA - Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Cocoa backend for embedding in Cocoa application
On Thu, Jul 3, 2008 at 8:41 AM, John Hunter <[EMAIL PROTECTED]> wrote: > On Wed, Jul 2, 2008 at 3:41 PM, Barry Wark <[EMAIL PROTECTED]> wrote: >> I've written the start of a Cocoa-native backend for matplotlib and >> would like to submit feedback on the code and on the possibility of >> including it in the standard matplotlib distribution. The backend > > Hey Barry, > > This is great and it is something we are interested in. I haven't had > a chance to test it and will be away next week but I can give you some > initial thoughts. In general, we want to pare down the number of > backends but OS X is an important platform and there are certainly > some advantages to doing native rendering. For us to accept a new > backend, we need to meet the following criteria: > > - someone volunteers to support it. This is a multi-year > commitment. Presumably this would be you. Yes. > > - feature complete - images, mathtext, rotated text, etc... It > sounds like the only part you are unsure about is mathtext so perhaps > Michael can advise. I don't think it will be too hard since Michael > has designed this to work with unicode fonts if requested. Using unicode fonts should make it easy. > > - gui backends: toolbar support Currently not implemented, but not a problem. > > If you think these are doable, that would be great. If not, I think > we can rework the backend infrastructure a bit to support external > backend, eg an rc backend setting which points to a file that contains > the backend implementation. This latter is worth doing in any case, > so if you want to have a look at it This would be _very_ useful, whether or not you decide to include a Cocoa native backend in the distribution. Perhaps also making it possible to delegate to an other package instead of just a file so that backends could be installed as separate eggs would be useuful (e.g. delegate the backend to my.package.backend). > >> implementation is not complete (image rendering and mathtext rendering >> are currently no implemented, nor are the print_* methods of the >> FigureCanvas). Image rendering is trivial once I figure out how to get >> the pixel data out of a matplotlib image (I just haven't investigated >> the API yet). The print_* methods are also trivial (see point 1 >> below). I'm not sure how to handle mathtext yet. This backend has two >> major feature differences from CocoaAgg: > >> 2. The reason I wrote the backend was so that matplotlib could be used >> seemlesslly from within a Cocoa application. Thus this backend *will >> not work* without an existing NSRunLoop. It won't work from the >> terminal or an IPython session. It will work from the in-progress >> Cocoa frontend for IPython or from any other Cocoa application. Again >> there are tradeoffs. On the positive side, figure windows are treated >> like any other application window, selectable from the Window menu >> etc. and matplotlib becomes a seemless part of the application. >> Existing backends designed to create their own runloop (e.g. CocoaAgg >> or TkAgg) cause menubar and run loop problems when used from within an >> existing application. It would be possible to merge the CocoaAgg and >> Cocoa backends in this regard to use the existing run loop if present. > > I know nothing about cocoa apps, but from the way you describe this I > think there may be some confusion in how the backends should work. I > will speak in terms of gtk since this is the toolkit I know best. The > FigureCanvas should be a widget which is embeddable in an app (in a > container or window, etc) -- the gtk figure canvas is such a widget > and can be used in a gtk app and mpl knows nothing about the > application or mainloop -- that part is up to the application > developer. The FigureManager is basically a pylab helper class and is > not meant to be used by the application developer, though I think some > backends may have been designed differently (eg wx). The > FigureManager creates a canvas, a toolbar and a window, and puts all > the pieces together. "show" is a pylab construct that raises the > active windows and starts the mainloop. No, in fact you've done a very good job of communicating the architecture and it appears that it was my mistake in explaining my work that's led to confusion. backend_cocoa.FigureCanvasView (a FigureCanvas subclass) is an NSView subclass that can be embedded in a Cocoa application to render matplotlib figures. We have a special use case in mind for the backend_cocoa.FigureManagerCocoa (the FigureManager subclass), however. I'm not sure if you've been following discussions on the ipython-dev regarding GUI frontends for IPython, so let me briefly recap. The new Twisted-based architecture of IPython now allows easy development of GUI frontends for the IPython engine because the engine is decoupled from readline. Thus a Cocoa-based frontend for IPython might behave like a terminal but be implemented as a native Cocoa widget that can be embedd
