matplotlib-users Mailing List for matplotlib

> hi, did you find this?
> http://matplotlib.sourceforge.net/faq/howto_faq.html?highlight=codex%20nxutils#test-whether-a-point-is-inside-a-polygon
I used the search function but no, i didn't find that link :) Shame on me and thank you Brent.
Looking at the implementation, it's really simple and i will do without matplotlib altogether and roll my own. In case anyone else needs this, the code is:
def insidePoly(x, y, xs, ys):
 """Decide whether point (x, y) lies inside the 2d polygon defined by its vertices zip(xs, ys).
 """
 result = False
 for now in xrange(len(xs)):
 if (ys[now] < y and ys[now - 1] >= y) or (ys[now - 1] < y and ys[now] >= y):
 if xs[now] + 1.0 * (y - ys[now]) * (xs[now - 1] - xs[now]) / (ys[now - 1] - ys[now]) < x:
 result = not result
 return result

On Wed, Mar 18, 2009 at 2:48 PM, crwe crwe <cr...@po...> wrote:
> Hi all,
>
> i need to draw a polygon (non-convex) into memory, so that i can query which pixels are inside the polygon and which not. I came across matplotlib which has some Polygon class in it so i presume i could use this (although so far, i didn't understand the terminology behind the library and how to string things together... patches? artists? O_O)
>
> What is the easiest way to draw the filled polygon, defined by a sequence of points, into some 1bit raster, so that i can answer queries like "Is the pixel at [10, 12] inside the polygon?"
>
> Cheers!
>
> ------------------------------------------------------------------------------
> Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are
> powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
> easily build your RIAs with Flex Builder, the Eclipse(TM)based development
> software that enables intelligent coding and step-through debugging.
> Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>
hi, did you find this?
http://matplotlib.sourceforge.net/faq/howto_faq.html?highlight=codex%20nxutils#test-whether-a-point-is-inside-a-polygon

Hi all,
i need to draw a polygon (non-convex) into memory, so that i can query which pixels are inside the polygon and which not. I came across matplotlib which has some Polygon class in it so i presume i could use this (although so far, i didn't understand the terminology behind the library and how to string things together... patches? artists? O_O) 
What is the easiest way to draw the filled polygon, defined by a sequence of points, into some 1bit raster, so that i can answer queries like "Is the pixel at [10, 12] inside the polygon?"
Cheers!

Thank you, and I apologize if the question wasnt appropriate for this list.
P.Romero
----------------------------------------
> To: mat...@li...
> From: jk...@ik...
> Date: 2009年3月18日 07:44:33 +0200
> Subject: Re: [Matplotlib-users] quick numpy question
>
> Pablo Romero writes:
>
>> quick numpy-related question.
>
> Not the best mailing list then, but...
>
>> I want to use numpy.arange() to create multiple arrays, and then I
>> want to join these arrays (or individual elements) to the final array
>> without repeating existing elements (create a 'union' from 2 or more
>> arrays or individual elements).
>
> Try np.union1d (and note that the numpy book has been in the public
> domain since August: http://www.tramy.us/guidetoscipy.html )
>
> --
> Jouni K. Seppänen
> http://www.iki.fi/jks
>
>
> ------------------------------------------------------------------------------
> Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are
> powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
> easily build your RIAs with Flex Builder, the Eclipse(TM)based development
> software that enables intelligent coding and step-through debugging.
> Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
_________________________________________________________________
Hotmail® is up to 70% faster. Now good news travels really fast. 
http://windowslive.com/online/hotmail?ocid=TXT_TAGLM_WL_HM_70faster_032009

Pablo Romero <rom...@ho...> writes:
> quick numpy-related question.
Not the best mailing list then, but...
> I want to use numpy.arange() to create multiple arrays, and then I
> want to join these arrays (or individual elements) to the final array
> without repeating existing elements (create a 'union' from 2 or more
> arrays or individual elements).
Try np.union1d (and note that the numpy book has been in the public
domain since August: http://www.tramy.us/guidetoscipy.html )
-- 
Jouni K. Seppänen
http://www.iki.fi/jks

Use Python set and then convert to numpy array?
Pablo Romero <rom...@ho...> 
18/03/2009 01:50 PM
To
<mat...@li...>
cc
Subject
[Matplotlib-users] quick numpy question
quick numpy-related question.
 
I want to use numpy.arange() to create multiple arrays, and then I want to 
join these arrays (or individual elements) to the final array without 
repeating existing elements (create a 'union' from 2 or more arrays or 
individual elements).
example:
 
lev=np.arange(0,20,2)
# lev=(0,2,4,6,8,...,20)
 
lev1=np.arange(0,18,3)
#lev1=(0,3,6,9,12,15,18)
 
#I want something like...
 
lev3=lev1+lev2 
 
#WITHOUT repeating elements (i.e., only one '12' in resulting array), 
i.e., I want:
#lev3=(0,2,3,4,6,8,9,10,12,14,15,16,18,20)
 
#or, add just a unique element(s)
 
lev4=lev3+(50,60)
 
#so I would want lev4 to look like this:
#lev4=(0,2,3,4,6,8,9,10,12,14,15,16,18,20,50,60)
 
 
are these types of operations possible using numpy?
How can this be done?
 
Please help
 
Thanks,
 
P.Romero
_________________________________________________________________
Windows Live? Contacts: Organize your contact list. 
http://windowslive.com/connect/post/marcusatmicrosoft.spaces.live.com-Blog-cns!503D1D86EBB2B53C!2285.entry?ocid=TXT_TAGLM_WL_UGC_Contacts_032009
------------------------------------------------------------------------------
Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are
powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
easily build your RIAs with Flex Builder, the Eclipse(TM)based development
software that enables intelligent coding and step-through debugging.
Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com
_______________________________________________
Matplotlib-users mailing list
Mat...@li...
https://lists.sourceforge.net/lists/listinfo/matplotlib-users
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email 
______________________________________________________________________
UNITED GROUP
This email message is the property of United Group. The information in this email is confidential and may be legally privileged. It is intended solely for the addressee. Access to this email by anyone else is unauthorised. If you are not the intended recipient, you may not disclose, copy or distribute this email, nor take or omit to take any action in reliance on it. United Group accepts no liability for any damage caused by this email or any attachments due to viruses, interference, interception, corruption or unauthorised access.
If you have received this email in error, please notify United Group immediately by email to the sender's email address and delete this document.

quick numpy-related question.
 
I want to use numpy.arange() to create multiple arrays, and then I want to join these arrays (or individual elements) to the final array without repeating existing elements (create a 'union' from 2 or more arrays or individual elements).
example:
 
lev=np.arange(0,20,2)
# lev=(0,2,4,6,8,...,20)
 
lev1=np.arange(0,18,3)
#lev1=(0,3,6,9,12,15,18)
 
#I want something like...
 
lev3=lev1+lev2 
 
#WITHOUT repeating elements (i.e., only one '12' in resulting array), i.e., I want:
#lev3=(0,2,3,4,6,8,9,10,12,14,15,16,18,20)
 
#or, add just a unique element(s)
 
lev4=lev3+(50,60)
 
#so I would want lev4 to look like this:
#lev4=(0,2,3,4,6,8,9,10,12,14,15,16,18,20,50,60)
 
 
are these types of operations possible using numpy?
How can this be done?
 
Please help
 
Thanks,
 
P.Romero
_________________________________________________________________
Windows LiveTM Contacts: Organize your contact list. 
http://windowslive.com/connect/post/marcusatmicrosoft.spaces.live.com-Blog-cns!503D1D86EBB2B53C!2285.entry?ocid=TXT_TAGLM_WL_UGC_Contacts_032009