matplotlib-devel Mailing List for matplotlib

I went ahead and committed the latest version of your patch. Thanks. 
This is a cool new feature.
I think it's probably low-risk for having Windows problems, but having 
it in SVN will make it more likely for Windows users to test.
Cheers,
Mike
Andrew Stock wrote:
> Jae-Joon,
>
> Thanks for your comments. You have successfully found areas in my
> patch that were overcomplicated!
>
> I have attached a new patch which doesn't alter the api of draw_image
> and uses the im object as Jae-Joon suggests.
>
> I've tested this on Linux Python 2.5 as before, but not on Windows as
> I don't have the correct development environment set up at the moment.
>
> Regards
>
> Andrew
>
> On Fri, Nov 7, 2008 at 10:36 AM, Jae-Joon Lee <lee...@gm...> wrote:
> 
>> Andrew,
>>
>> I just had a quick look at your patch.
>> I'm a bit distracted with your changes regarding the "url" support of the image.
>> Do we need to change the api of the draw_image()? Can we just utilize
>> "im" object as we did with the "gc"? Check the patch below. This
>> simple method seem to work fine for me.
>>
>> I also noted that, in the __init__() methods of the Patch and the
>> AxesImage class, you explicitly declare "url" as a keyword argument
>> and also initialize self.url. I don't think these are necessary as
>> "url" is already a property of the Artist class.
>>
>> IHTH,
>>
>> -JJ
>>
>>
>> Index: lib/matplotlib/image.py
>> ===================================================================
>> --- lib/matplotlib/image.py (revision 6361)
>> +++ lib/matplotlib/image.py (working copy)
>> @@ -234,6 +234,7 @@
>> self.axes.get_yscale() != 'linear'):
>> warnings.warn("Images are not supported on non-linear axes.")
>> im = self.make_image(renderer.get_image_magnification())
>> + im._url = self.get_url()
>> l, b, widthDisplay, heightDisplay = self.axes.bbox.bounds
>> renderer.draw_image(round(l), round(b), im, self.axes.bbox.frozen(),
>> *self.get_transformed_clip_path_and_affine())
>> Index: lib/matplotlib/backends/backend_svg.py
>> ===================================================================
>> --- lib/matplotlib/backends/backend_svg.py (revision 6361)
>> +++ lib/matplotlib/backends/backend_svg.py (working copy)
>> @@ -274,6 +283,9 @@
>>
>> h,w = im.get_size_out()
>>
>> + url = im._url
>> + if url is not None:
>> + self._svgwriter.write('<a xlink:href="%s">' % url)
>> self._svgwriter.write (
>> '<image x="%f" y="%f" width="%f" height="%f" '
>> '%s xlink:href="'%(x/trans[0],
>> (self.height-y)/trans[3]-h, w, h, transstr)
>> @@ -298,6 +310,8 @@
>> self._svgwriter.write(filename)
>>
>> self._svgwriter.write('"/>\n')
>> + if url is not None:
>> + self._svgwriter.write('</a>')
>>
>> def draw_text(self, gc, x, y, s, prop, angle, ismath):
>> if ismath:
>>
>>
>>
>>
>> On Thu, Nov 6, 2008 at 11:40 AM, Andrew Stock
>> <mat...@an...> wrote:
>> 
>>> Thanks Michael,
>>>
>>> I've attached a new diff file which I believe also has all the
>>> necessary changes to the collections and images. I've also attached
>>> two simple scripts which test the collections and image functionality.
>>>
>>> I've had to make some modification to extension code in this patch
>>> which is definitely not my area of expertise so it would be worth
>>> someone more experienced casting an eye over this.
>>>
>>> I've tested this on Linux and successfully run the backend_driver.py
>>> file (or at least, it failed with the same errors as before I applied
>>> the patch!).
>>>
>>> Any other comments welcome
>>>
>>> Thanks
>>>
>>> On Wed, Nov 5, 2008 at 2:31 PM, Michael Droettboom <md...@st...> wrote:
>>> 
>>>> This looks great to me. I can confirm that this works on Linux as well.
>>>>
>>>> I think from here it's just a matter of applying the same pattern of changes
>>>> to collections and images. Once that's done, I'm happy to apply the patch.
>>>> And if you plan to make a lot of changes in the future, it generally pretty
>>>> easy to get commit access. Just ask.
>>>>
>>>> Mike
>>>>
>>>> Andrew Stock wrote:
>>>> 
>>>>> Hi,
>>>>>
>>>>> I've attached a diff file which implements the basic functionality. It
>>>>> currently doesn't handle collections or draw_image, but I wanted to
>>>>> get something simple working first, before expanding the scope. A
>>>>> simple test program is as follows:
>>>>>
>>>>> from pylab import *
>>>>>
>>>>> f = figure()
>>>>> a,b = bar([1,2], [2,5], url='http://www.bbc.co.uk/')
>>>>>
>>>>> a.set_url('http://www.google.com')
>>>>>
>>>>> f.canvas.print_figure(r'c:\test.svg')
>>>>>
>>>>> I'd be interested in comments / feedback on the attached before I
>>>>> start to branch out into more significant changes!
>>>>>
>>>>> Thanks
>>>>>
>>>>> Andrew
>>>>>
>>>>> On Thu, Oct 30, 2008 at 8:02 PM, Michael Droettboom <md...@st...>
>>>>> wrote:
>>>>>
>>>>> 
>>>>>> I realised in my earlier message, I didn't really address your initial
>>>>>> request for feedback on your approach.
>>>>>>
>>>>>> I think the goal here should be to make the url support as pervasive as
>>>>>> possible wrt both plot types and backends.
>>>>>>
>>>>>> Many of the high-level plotting functions (such as bar()) take a standard
>>>>>> set of "Artist" keywords. In the docs, you'll often see a table like the
>>>>>> one at the bottom for bar():
>>>>>>
>>>>>>
>>>>>> http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.bar
>>>>>>
>>>>>> This support all happens automatically simply by adding a setter and
>>>>>> getter
>>>>>> to the "Artist" class. So, in Artist, simply add set_url/get_url methods
>>>>>> and a private attribute to store the url. You shouldn't have to touch
>>>>>> any
>>>>>> of the high-level plotting functions to have this supported everywhere
>>>>>> where
>>>>>> it makes sense.
>>>>>>
>>>>>> Then, to use the url value, you'll want to store it in a GraphicsContext
>>>>>> object to pass to the backend. So you'll want to add an attribute and
>>>>>> getter/setter in GraphicsContextBase as well.
>>>>>>
>>>>>> All of the places where the front-end creates a gc and passes it to the
>>>>>> backend will need to be updated (such as Artist.draw, Text.draw, perhaps
>>>>>> others, do a grep for the public methods in RendererBase). Where it sets
>>>>>> things like facecolor on the GraphicsContext, it should also set a url.
>>>>>>
>>>>>> Then, in backends where appropriate you would use the url value if
>>>>>> present.
>>>>>> You could start with SVG, and maybe someone can come along and add PDF
>>>>>> support later.
>>>>>>
>>>>>> An additional complication for completeness is handling Collections.
>>>>>> Collections store a list of graphics context information (facecolor,
>>>>>> edgecolor etc.) rather than a single one. Therefore, you'll want to add
>>>>>> set_urls/get_urls to Collection as well, and then deal with passing those
>>>>>> values to the backend. Collections don't use a GraphicsContext class, so
>>>>>> you'll need to add a new arg to draw_path_collection in all backends.
>>>>>> (Refactoring this so we pass an object to the backends rather than a
>>>>>> long
>>>>>> list of arguments would be welcome to avoid needing to update multiple
>>>>>> backends for these sorts of new features in the future). You will also
>>>>>> need
>>>>>> to update RendererBase._iter_collection to support iterating over URLs in
>>>>>> the same way as everything else there.
>>>>>>
>>>>>> draw_image also doesn't use a gc, so you'll need to add an argument
>>>>>> there.
>>>>>>
>>>>>> Hope that gives you a road map... Please let me know if I can help
>>>>>> further.
>>>>>>
>>>>>> Mike
>>>>>>
>>>>>> Andrew Stock wrote:
>>>>>>
>>>>>> 
>>>>>>> Hi,
>>>>>>>
>>>>>>> I have a requirement to make clickable bar charts using the SVG output
>>>>>>> (rather than html maps).
>>>>>>>
>>>>>>> An initial look has suggested that the following changes would be
>>>>>>> required:
>>>>>>>
>>>>>>> backend_bases.py: Add a url property to GraphicsContextBase
>>>>>>> (defaulting to None, so it's all backwards compatible)
>>>>>>> axes.py: Add a url option to the bar function and pass this on to the
>>>>>>> constructor of the Rectangle object
>>>>>>> patches.py: Pass the url option in the constructor for the Patch
>>>>>>> object to the GraphicsContextBase object created in the draw function
>>>>>>> backends/backend_svg.py: Add check to _draw_svg_element for url set in
>>>>>>> gc. If it is, write out SVG code for xlink.
>>>>>>>
>>>>>>> I can make these changes and (if people think it would be useful)
>>>>>>> contribute the changes back. However, before I do this, I wanted to
>>>>>>> check whether this is the right approach to take - I'm not experienced
>>>>>>> with the internals of matplotlib and so if there's a better way of
>>>>>>> doing it, I'd be grateful for the advice.
>>>>>>>
>>>>>>> Once I got the bar charts working, I would be interested in possibly
>>>>>>> extending this to other chart types.
>>>>>>>
>>>>>>> Regards
>>>>>>>
>>>>>>> Andrew
>>>>>>>
>>>>>>>
>>>>>>> -------------------------------------------------------------------------
>>>>>>> This SF.Net email is sponsored by the Moblin Your Move Developer's
>>>>>>> challenge
>>>>>>> Build the coolest Linux based applications with Moblin SDK & win great
>>>>>>> prizes
>>>>>>> Grand prize is a trip for two to an Open Source event anywhere in the
>>>>>>> world
>>>>>>> http://moblin-contest.org/redirect.php?banner_id=100&url=/
>>>>>>> _______________________________________________
>>>>>>> Matplotlib-devel mailing list
>>>>>>> Mat...@li...
>>>>>>> https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
>>>>>>>
>>>>>>>
>>>>>>> 
>>>>>> --
>>>>>> Michael Droettboom
>>>>>> Science Software Branch
>>>>>> Operations and Engineering Division
>>>>>> Space Telescope Science Institute
>>>>>> Operated by AURA for NASA
>>>>>>
>>>>>>
>>>>>>
>>>>>> 
>>>> --
>>>> Michael Droettboom
>>>> Science Software Branch
>>>> Operations and Engineering Division
>>>> Space Telescope Science Institute
>>>> Operated by AURA for NASA
>>>>
>>>>
>>>> 
>>> -------------------------------------------------------------------------
>>> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
>>> Build the coolest Linux based applications with Moblin SDK & win great prizes
>>> Grand prize is a trip for two to an Open Source event anywhere in the world
>>> http://moblin-contest.org/redirect.php?banner_id=100&url=/
>>> _______________________________________________
>>> Matplotlib-devel mailing list
>>> Mat...@li...
>>> https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
>>>
>>>
>>> 
-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

Jae-Joon,
Thanks for your comments. You have successfully found areas in my
patch that were overcomplicated!
I have attached a new patch which doesn't alter the api of draw_image
and uses the im object as Jae-Joon suggests.
I've tested this on Linux Python 2.5 as before, but not on Windows as
I don't have the correct development environment set up at the moment.
Regards
Andrew
On Fri, Nov 7, 2008 at 10:36 AM, Jae-Joon Lee <lee...@gm...> wrote:
> Andrew,
>
> I just had a quick look at your patch.
> I'm a bit distracted with your changes regarding the "url" support of the image.
> Do we need to change the api of the draw_image()? Can we just utilize
> "im" object as we did with the "gc"? Check the patch below. This
> simple method seem to work fine for me.
>
> I also noted that, in the __init__() methods of the Patch and the
> AxesImage class, you explicitly declare "url" as a keyword argument
> and also initialize self.url. I don't think these are necessary as
> "url" is already a property of the Artist class.
>
> IHTH,
>
> -JJ
>
>
> Index: lib/matplotlib/image.py
> ===================================================================
> --- lib/matplotlib/image.py (revision 6361)
> +++ lib/matplotlib/image.py (working copy)
> @@ -234,6 +234,7 @@
> self.axes.get_yscale() != 'linear'):
> warnings.warn("Images are not supported on non-linear axes.")
> im = self.make_image(renderer.get_image_magnification())
> + im._url = self.get_url()
> l, b, widthDisplay, heightDisplay = self.axes.bbox.bounds
> renderer.draw_image(round(l), round(b), im, self.axes.bbox.frozen(),
> *self.get_transformed_clip_path_and_affine())
> Index: lib/matplotlib/backends/backend_svg.py
> ===================================================================
> --- lib/matplotlib/backends/backend_svg.py (revision 6361)
> +++ lib/matplotlib/backends/backend_svg.py (working copy)
> @@ -274,6 +283,9 @@
>
> h,w = im.get_size_out()
>
> + url = im._url
> + if url is not None:
> + self._svgwriter.write('<a xlink:href="%s">' % url)
> self._svgwriter.write (
> '<image x="%f" y="%f" width="%f" height="%f" '
> '%s xlink:href="'%(x/trans[0],
> (self.height-y)/trans[3]-h, w, h, transstr)
> @@ -298,6 +310,8 @@
> self._svgwriter.write(filename)
>
> self._svgwriter.write('"/>\n')
> + if url is not None:
> + self._svgwriter.write('</a>')
>
> def draw_text(self, gc, x, y, s, prop, angle, ismath):
> if ismath:
>
>
>
>
> On Thu, Nov 6, 2008 at 11:40 AM, Andrew Stock
> <mat...@an...> wrote:
>> Thanks Michael,
>>
>> I've attached a new diff file which I believe also has all the
>> necessary changes to the collections and images. I've also attached
>> two simple scripts which test the collections and image functionality.
>>
>> I've had to make some modification to extension code in this patch
>> which is definitely not my area of expertise so it would be worth
>> someone more experienced casting an eye over this.
>>
>> I've tested this on Linux and successfully run the backend_driver.py
>> file (or at least, it failed with the same errors as before I applied
>> the patch!).
>>
>> Any other comments welcome
>>
>> Thanks
>>
>> On Wed, Nov 5, 2008 at 2:31 PM, Michael Droettboom <md...@st...> wrote:
>>> This looks great to me. I can confirm that this works on Linux as well.
>>>
>>> I think from here it's just a matter of applying the same pattern of changes
>>> to collections and images. Once that's done, I'm happy to apply the patch.
>>> And if you plan to make a lot of changes in the future, it generally pretty
>>> easy to get commit access. Just ask.
>>>
>>> Mike
>>>
>>> Andrew Stock wrote:
>>>>
>>>> Hi,
>>>>
>>>> I've attached a diff file which implements the basic functionality. It
>>>> currently doesn't handle collections or draw_image, but I wanted to
>>>> get something simple working first, before expanding the scope. A
>>>> simple test program is as follows:
>>>>
>>>> from pylab import *
>>>>
>>>> f = figure()
>>>> a,b = bar([1,2], [2,5], url='http://www.bbc.co.uk/')
>>>>
>>>> a.set_url('http://www.google.com')
>>>>
>>>> f.canvas.print_figure(r'c:\test.svg')
>>>>
>>>> I'd be interested in comments / feedback on the attached before I
>>>> start to branch out into more significant changes!
>>>>
>>>> Thanks
>>>>
>>>> Andrew
>>>>
>>>> On Thu, Oct 30, 2008 at 8:02 PM, Michael Droettboom <md...@st...>
>>>> wrote:
>>>>
>>>>>
>>>>> I realised in my earlier message, I didn't really address your initial
>>>>> request for feedback on your approach.
>>>>>
>>>>> I think the goal here should be to make the url support as pervasive as
>>>>> possible wrt both plot types and backends.
>>>>>
>>>>> Many of the high-level plotting functions (such as bar()) take a standard
>>>>> set of "Artist" keywords. In the docs, you'll often see a table like the
>>>>> one at the bottom for bar():
>>>>>
>>>>>
>>>>> http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.bar
>>>>>
>>>>> This support all happens automatically simply by adding a setter and
>>>>> getter
>>>>> to the "Artist" class. So, in Artist, simply add set_url/get_url methods
>>>>> and a private attribute to store the url. You shouldn't have to touch
>>>>> any
>>>>> of the high-level plotting functions to have this supported everywhere
>>>>> where
>>>>> it makes sense.
>>>>>
>>>>> Then, to use the url value, you'll want to store it in a GraphicsContext
>>>>> object to pass to the backend. So you'll want to add an attribute and
>>>>> getter/setter in GraphicsContextBase as well.
>>>>>
>>>>> All of the places where the front-end creates a gc and passes it to the
>>>>> backend will need to be updated (such as Artist.draw, Text.draw, perhaps
>>>>> others, do a grep for the public methods in RendererBase). Where it sets
>>>>> things like facecolor on the GraphicsContext, it should also set a url.
>>>>>
>>>>> Then, in backends where appropriate you would use the url value if
>>>>> present.
>>>>> You could start with SVG, and maybe someone can come along and add PDF
>>>>> support later.
>>>>>
>>>>> An additional complication for completeness is handling Collections.
>>>>> Collections store a list of graphics context information (facecolor,
>>>>> edgecolor etc.) rather than a single one. Therefore, you'll want to add
>>>>> set_urls/get_urls to Collection as well, and then deal with passing those
>>>>> values to the backend. Collections don't use a GraphicsContext class, so
>>>>> you'll need to add a new arg to draw_path_collection in all backends.
>>>>> (Refactoring this so we pass an object to the backends rather than a
>>>>> long
>>>>> list of arguments would be welcome to avoid needing to update multiple
>>>>> backends for these sorts of new features in the future). You will also
>>>>> need
>>>>> to update RendererBase._iter_collection to support iterating over URLs in
>>>>> the same way as everything else there.
>>>>>
>>>>> draw_image also doesn't use a gc, so you'll need to add an argument
>>>>> there.
>>>>>
>>>>> Hope that gives you a road map... Please let me know if I can help
>>>>> further.
>>>>>
>>>>> Mike
>>>>>
>>>>> Andrew Stock wrote:
>>>>>
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I have a requirement to make clickable bar charts using the SVG output
>>>>>> (rather than html maps).
>>>>>>
>>>>>> An initial look has suggested that the following changes would be
>>>>>> required:
>>>>>>
>>>>>> backend_bases.py: Add a url property to GraphicsContextBase
>>>>>> (defaulting to None, so it's all backwards compatible)
>>>>>> axes.py: Add a url option to the bar function and pass this on to the
>>>>>> constructor of the Rectangle object
>>>>>> patches.py: Pass the url option in the constructor for the Patch
>>>>>> object to the GraphicsContextBase object created in the draw function
>>>>>> backends/backend_svg.py: Add check to _draw_svg_element for url set in
>>>>>> gc. If it is, write out SVG code for xlink.
>>>>>>
>>>>>> I can make these changes and (if people think it would be useful)
>>>>>> contribute the changes back. However, before I do this, I wanted to
>>>>>> check whether this is the right approach to take - I'm not experienced
>>>>>> with the internals of matplotlib and so if there's a better way of
>>>>>> doing it, I'd be grateful for the advice.
>>>>>>
>>>>>> Once I got the bar charts working, I would be interested in possibly
>>>>>> extending this to other chart types.
>>>>>>
>>>>>> Regards
>>>>>>
>>>>>> Andrew
>>>>>>
>>>>>>
>>>>>> -------------------------------------------------------------------------
>>>>>> This SF.Net email is sponsored by the Moblin Your Move Developer's
>>>>>> challenge
>>>>>> Build the coolest Linux based applications with Moblin SDK & win great
>>>>>> prizes
>>>>>> Grand prize is a trip for two to an Open Source event anywhere in the
>>>>>> world
>>>>>> http://moblin-contest.org/redirect.php?banner_id=100&url=/
>>>>>> _______________________________________________
>>>>>> Matplotlib-devel mailing list
>>>>>> Mat...@li...
>>>>>> https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
>>>>>>
>>>>>>
>>>>>
>>>>> --
>>>>> Michael Droettboom
>>>>> Science Software Branch
>>>>> Operations and Engineering Division
>>>>> Space Telescope Science Institute
>>>>> Operated by AURA for NASA
>>>>>
>>>>>
>>>>>
>>>
>>> --
>>> Michael Droettboom
>>> Science Software Branch
>>> Operations and Engineering Division
>>> Space Telescope Science Institute
>>> Operated by AURA for NASA
>>>
>>>
>>
>> -------------------------------------------------------------------------
>> This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
>> Build the coolest Linux based applications with Moblin SDK & win great prizes
>> Grand prize is a trip for two to an Open Source event anywhere in the world
>> http://moblin-contest.org/redirect.php?banner_id=100&url=/
>> _______________________________________________
>> Matplotlib-devel mailing list
>> Mat...@li...
>> https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
>>
>>
>

Andrew,
I just had a quick look at your patch.
I'm a bit distracted with your changes regarding the "url" support of the image.
Do we need to change the api of the draw_image()? Can we just utilize
"im" object as we did with the "gc"? Check the patch below. This
simple method seem to work fine for me.
I also noted that, in the __init__() methods of the Patch and the
AxesImage class, you explicitly declare "url" as a keyword argument
and also initialize self.url. I don't think these are necessary as
"url" is already a property of the Artist class.
IHTH,
-JJ
Index: lib/matplotlib/image.py
===================================================================
--- lib/matplotlib/image.py	(revision 6361)
+++ lib/matplotlib/image.py	(working copy)
@@ -234,6 +234,7 @@
 self.axes.get_yscale() != 'linear'):
 warnings.warn("Images are not supported on non-linear axes.")
 im = self.make_image(renderer.get_image_magnification())
+ im._url = self.get_url()
 l, b, widthDisplay, heightDisplay = self.axes.bbox.bounds
 renderer.draw_image(round(l), round(b), im, self.axes.bbox.frozen(),
 *self.get_transformed_clip_path_and_affine())
Index: lib/matplotlib/backends/backend_svg.py
===================================================================
--- lib/matplotlib/backends/backend_svg.py	(revision 6361)
+++ lib/matplotlib/backends/backend_svg.py	(working copy)
@@ -274,6 +283,9 @@
 h,w = im.get_size_out()
+ url = im._url
+ if url is not None:
+ self._svgwriter.write('<a xlink:href="%s">' % url)
 self._svgwriter.write (
 '<image x="%f" y="%f" width="%f" height="%f" '
 '%s xlink:href="'%(x/trans[0],
(self.height-y)/trans[3]-h, w, h, transstr)
@@ -298,6 +310,8 @@
 self._svgwriter.write(filename)
 self._svgwriter.write('"/>\n')
+ if url is not None:
+ self._svgwriter.write('</a>')
 def draw_text(self, gc, x, y, s, prop, angle, ismath):
 if ismath:
On Thu, Nov 6, 2008 at 11:40 AM, Andrew Stock
<mat...@an...> wrote:
> Thanks Michael,
>
> I've attached a new diff file which I believe also has all the
> necessary changes to the collections and images. I've also attached
> two simple scripts which test the collections and image functionality.
>
> I've had to make some modification to extension code in this patch
> which is definitely not my area of expertise so it would be worth
> someone more experienced casting an eye over this.
>
> I've tested this on Linux and successfully run the backend_driver.py
> file (or at least, it failed with the same errors as before I applied
> the patch!).
>
> Any other comments welcome
>
> Thanks
>
> On Wed, Nov 5, 2008 at 2:31 PM, Michael Droettboom <md...@st...> wrote:
>> This looks great to me. I can confirm that this works on Linux as well.
>>
>> I think from here it's just a matter of applying the same pattern of changes
>> to collections and images. Once that's done, I'm happy to apply the patch.
>> And if you plan to make a lot of changes in the future, it generally pretty
>> easy to get commit access. Just ask.
>>
>> Mike
>>
>> Andrew Stock wrote:
>>>
>>> Hi,
>>>
>>> I've attached a diff file which implements the basic functionality. It
>>> currently doesn't handle collections or draw_image, but I wanted to
>>> get something simple working first, before expanding the scope. A
>>> simple test program is as follows:
>>>
>>> from pylab import *
>>>
>>> f = figure()
>>> a,b = bar([1,2], [2,5], url='http://www.bbc.co.uk/')
>>>
>>> a.set_url('http://www.google.com')
>>>
>>> f.canvas.print_figure(r'c:\test.svg')
>>>
>>> I'd be interested in comments / feedback on the attached before I
>>> start to branch out into more significant changes!
>>>
>>> Thanks
>>>
>>> Andrew
>>>
>>> On Thu, Oct 30, 2008 at 8:02 PM, Michael Droettboom <md...@st...>
>>> wrote:
>>>
>>>>
>>>> I realised in my earlier message, I didn't really address your initial
>>>> request for feedback on your approach.
>>>>
>>>> I think the goal here should be to make the url support as pervasive as
>>>> possible wrt both plot types and backends.
>>>>
>>>> Many of the high-level plotting functions (such as bar()) take a standard
>>>> set of "Artist" keywords. In the docs, you'll often see a table like the
>>>> one at the bottom for bar():
>>>>
>>>>
>>>> http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.bar
>>>>
>>>> This support all happens automatically simply by adding a setter and
>>>> getter
>>>> to the "Artist" class. So, in Artist, simply add set_url/get_url methods
>>>> and a private attribute to store the url. You shouldn't have to touch
>>>> any
>>>> of the high-level plotting functions to have this supported everywhere
>>>> where
>>>> it makes sense.
>>>>
>>>> Then, to use the url value, you'll want to store it in a GraphicsContext
>>>> object to pass to the backend. So you'll want to add an attribute and
>>>> getter/setter in GraphicsContextBase as well.
>>>>
>>>> All of the places where the front-end creates a gc and passes it to the
>>>> backend will need to be updated (such as Artist.draw, Text.draw, perhaps
>>>> others, do a grep for the public methods in RendererBase). Where it sets
>>>> things like facecolor on the GraphicsContext, it should also set a url.
>>>>
>>>> Then, in backends where appropriate you would use the url value if
>>>> present.
>>>> You could start with SVG, and maybe someone can come along and add PDF
>>>> support later.
>>>>
>>>> An additional complication for completeness is handling Collections.
>>>> Collections store a list of graphics context information (facecolor,
>>>> edgecolor etc.) rather than a single one. Therefore, you'll want to add
>>>> set_urls/get_urls to Collection as well, and then deal with passing those
>>>> values to the backend. Collections don't use a GraphicsContext class, so
>>>> you'll need to add a new arg to draw_path_collection in all backends.
>>>> (Refactoring this so we pass an object to the backends rather than a
>>>> long
>>>> list of arguments would be welcome to avoid needing to update multiple
>>>> backends for these sorts of new features in the future). You will also
>>>> need
>>>> to update RendererBase._iter_collection to support iterating over URLs in
>>>> the same way as everything else there.
>>>>
>>>> draw_image also doesn't use a gc, so you'll need to add an argument
>>>> there.
>>>>
>>>> Hope that gives you a road map... Please let me know if I can help
>>>> further.
>>>>
>>>> Mike
>>>>
>>>> Andrew Stock wrote:
>>>>
>>>>>
>>>>> Hi,
>>>>>
>>>>> I have a requirement to make clickable bar charts using the SVG output
>>>>> (rather than html maps).
>>>>>
>>>>> An initial look has suggested that the following changes would be
>>>>> required:
>>>>>
>>>>> backend_bases.py: Add a url property to GraphicsContextBase
>>>>> (defaulting to None, so it's all backwards compatible)
>>>>> axes.py: Add a url option to the bar function and pass this on to the
>>>>> constructor of the Rectangle object
>>>>> patches.py: Pass the url option in the constructor for the Patch
>>>>> object to the GraphicsContextBase object created in the draw function
>>>>> backends/backend_svg.py: Add check to _draw_svg_element for url set in
>>>>> gc. If it is, write out SVG code for xlink.
>>>>>
>>>>> I can make these changes and (if people think it would be useful)
>>>>> contribute the changes back. However, before I do this, I wanted to
>>>>> check whether this is the right approach to take - I'm not experienced
>>>>> with the internals of matplotlib and so if there's a better way of
>>>>> doing it, I'd be grateful for the advice.
>>>>>
>>>>> Once I got the bar charts working, I would be interested in possibly
>>>>> extending this to other chart types.
>>>>>
>>>>> Regards
>>>>>
>>>>> Andrew
>>>>>
>>>>>
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>>>>>
>>>>
>>>> --
>>>> Michael Droettboom
>>>> Science Software Branch
>>>> Operations and Engineering Division
>>>> Space Telescope Science Institute
>>>> Operated by AURA for NASA
>>>>
>>>>
>>>>
>>
>> --
>> Michael Droettboom
>> Science Software Branch
>> Operations and Engineering Division
>> Space Telescope Science Institute
>> Operated by AURA for NASA
>>
>>
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