matplotlib 1.5.1 closed path in draw_path when it is not necessary closed

tacaswell · August 14, 2015, 2:21pm

Please keep all discussion on the mailing list (matplotlib-devel at python.org
).

Being pedantic about versions, current master is v1.5.0dev1 , not 1.5.1
(which will be the first bug fix release in the 1.5 series which may or may
not ever happen).

I don't have gtk installed to easily test this and it looks fine with
qt4agg, can you provide a minimal script and the code paths from a simple
polygon?

Tom

···

On Fri, Aug 14, 2015 at 9:05 AM Andr?s Vargas <andnovar at gmail.com> wrote:

Hello Tom,

Thanks for your prompt reply. I am using the function path.to_polygons()
and that gives me a non-closed path in matplotlib 1.4.3 (last stable
release) and give me a closed path in 1.5.1 (master from github). You can
see the problem if you run integral_demo.py with matplotlib 1.5.1 master
with matplotlib.use('gtk').

Thanks, Andres

On Fri, Aug 14, 2015 at 8:13 AM, Thomas Caswell <tcaswell at gmail.com> > wrote:

Did you mean 1.4.1 instead of 1.5.1 ?

Exactly which paths are you looking at and how are you generating then on
the mpl side? We have many ways to generate the paths and there maybe
inconsistence in how closed paths are handled.

Tom

On Wed, Aug 12, 2015, 1:57 PM Andr?s Vargas <andnovar at gmail.com> wrote:

Hello,

My name is Andres I am developing a backend for kivy. I was initially
developing for 1.5.1 and I found that the paths are coming with the initial
vertex at the end of the list. Does anyone know whether this is change in
the way paths are sent ? and how can be fixed coming from 1.4.3 since I am
developing the backend for that version.

Thanks, Andres

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andnovar · August 14, 2015, 2:40pm

I am so sorry I did a wrong use of the reply button. I am currently on
1.5.dev1 and when I run from examples/showcase/integral_demo.py I see a
line from the last point to the initial as can be seen here
http://imagebin.ca/v/2C7X8CAKZN0g and this happens in all the paths that
are open.

This is how gtk is doing it:

I am doing this:

In 1.4.3 does not have this point at the end of the polygon path.

Thanks, Andres

···

On Fri, Aug 14, 2015 at 10:21 AM, Thomas Caswell <tcaswell at gmail.com> wrote:

Please keep all discussion on the mailing list (
matplotlib-devel at python.org).

Being pedantic about versions, current master is v1.5.0dev1 , not 1.5.1
(which will be the first bug fix release in the 1.5 series which may or may
not ever happen).

I don't have gtk installed to easily test this and it looks fine with
qt4agg, can you provide a minimal script and the code paths from a simple
polygon?

Tom

On Fri, Aug 14, 2015 at 9:05 AM Andr?s Vargas <andnovar at gmail.com> wrote:

Hello Tom,

Thanks for your prompt reply. I am using the function path.to_polygons()
and that gives me a non-closed path in matplotlib 1.4.3 (last stable
release) and give me a closed path in 1.5.1 (master from github). You can
see the problem if you run integral_demo.py with matplotlib 1.5.1 master
with matplotlib.use('gtk').

Thanks, Andres

On Fri, Aug 14, 2015 at 8:13 AM, Thomas Caswell <tcaswell at gmail.com> >> wrote:

Did you mean 1.4.1 instead of 1.5.1 ?

Exactly which paths are you looking at and how are you generating then
on the mpl side? We have many ways to generate the paths and there maybe
inconsistence in how closed paths are handled.

Tom

On Wed, Aug 12, 2015, 1:57 PM Andr?s Vargas <andnovar at gmail.com> wrote:

Hello,

My name is Andres I am developing a backend for kivy. I was initially
developing for 1.5.1 and I found that the paths are coming with the initial
vertex at the end of the list. Does anyone know whether this is change in
the way paths are sent ? and how can be fixed coming from 1.4.3 since I am
developing the backend for that version.

Thanks, Andres

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jenshnielsen · August 14, 2015, 3:26pm

I can reproduce the problem with the GTK backend but not the GTKAgg or
GTKCairo backends. Unless you have some specific reason for using the GTK
backend I would strongly recommend against it. It is untested, unmaintained
and officially discouraged:
http://matplotlib.org/faq/usage_faq.html#what-is-a-backend I would
recommend you to use GTKAgg instead.

Furthermore the GDK toolkit, used in that backend, has been dropped from
GTK3 which officially uses Cairo internally and thus Matplotlib only
supports GTK3Agg and GTK3Cario

I guess the issue is likely a result of the large C++ refactoring in
master.

best
Jens

fre. 14. aug. 2015 kl. 15.21 skrev Thomas Caswell <tcaswell at gmail.com>:

Please keep all discussion on the mailing list (
matplotlib-devel at python.org).

Being pedantic about versions, current master is v1.5.0dev1 , not 1.5.1
(which will be the first bug fix release in the 1.5 series which may or may
not ever happen).

I don't have gtk installed to easily test this and it looks fine with
qt4agg, can you provide a minimal script and the code paths from a simple
polygon?

Tom

Hello Tom,

Thanks for your prompt reply. I am using the function path.to_polygons()
and that gives me a non-closed path in matplotlib 1.4.3 (last stable
release) and give me a closed path in 1.5.1 (master from github). You can
see the problem if you run integral_demo.py with matplotlib 1.5.1 master
with matplotlib.use('gtk').

Thanks, Andres

Did you mean 1.4.1 instead of 1.5.1 ?

Exactly which paths are you looking at and how are you generating then
on the mpl side? We have many ways to generate the paths and there maybe
inconsistence in how closed paths are handled.

Tom

Hello,

My name is Andres I am developing a backend for kivy. I was initially
developing for 1.5.1 and I found that the paths are coming with the initial
vertex at the end of the list. Does anyone know whether this is change in
the way paths are sent ? and how can be fixed coming from 1.4.3 since I am
developing the backend for that version.

Thanks, Andres

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···

On Fri, Aug 14, 2015 at 9:05 AM Andr?s Vargas <andnovar at gmail.com> wrote:

On Fri, Aug 14, 2015 at 8:13 AM, Thomas Caswell <tcaswell at gmail.com> >> wrote:

On Wed, Aug 12, 2015, 1:57 PM Andr?s Vargas <andnovar at gmail.com> wrote:

tacaswell · September 9, 2015, 12:22am

Andres,

Have you made any progress on this?

Using the code in integral_demo.py


import numpy as np
import matplotlib.pyplot as plt
from matplotlib.patches import Polygon

def func(x):
    return (x - 3) * (x - 5) * (x - 7) + 85

a, b = 2, 9  # integral limits

# Make the shaded region
ix = np.linspace(a, b)
iy = func(ix)
verts = [(a, 0)] + list(zip(ix, iy)) + [(b, 0)]
poly = Polygon(verts, facecolor='0.9', edgecolor='0.5')
pth = poly.get_path()

which if you look at the vertices and codes on both 1.4.3 and current(ish)
master you get

In [73]: pth.vertices
Out[74]:
array([[   2.        ,    0.        ],
       [   2.        ,   70.        ],
       [   2.14285714,   73.10495627],
       [   2.28571429,   75.86005831],
       [   2.42857143,   78.28279883],
       [   2.57142857,   80.39067055],
       [   2.71428571,   82.20116618],
       [   2.85714286,   83.73177843],
       [   3.        ,   85.        ],
       [   3.14285714,   86.02332362],
       [   3.28571429,   86.81924198],
       [   3.42857143,   87.40524781],
       [   3.57142857,   87.79883382],
       [   3.71428571,   88.01749271],
       [   3.85714286,   88.0787172 ],
       [   4.        ,   88.        ],
       [   4.14285714,   87.79883382],
       [   4.28571429,   87.49271137],
       [   4.42857143,   87.09912536],
       [   4.57142857,   86.63556851],
       [   4.71428571,   86.11953353],
       [   4.85714286,   85.56851312],
       [   5.        ,   85.        ],
       [   5.14285714,   84.43148688],
       [   5.28571429,   83.88046647],
       [   5.42857143,   83.36443149],
       [   5.57142857,   82.90087464],
       [   5.71428571,   82.50728863],
       [   5.85714286,   82.20116618],
       [   6.        ,   82.        ],
       [   6.14285714,   81.9212828 ],
       [   6.28571429,   81.98250729],
       [   6.42857143,   82.20116618],
       [   6.57142857,   82.59475219],
       [   6.71428571,   83.18075802],
       [   6.85714286,   83.97667638],
       [   7.        ,   85.        ],
       [   7.14285714,   86.26822157],
       [   7.28571429,   87.79883382],
       [   7.42857143,   89.60932945],
       [   7.57142857,   91.71720117],
       [   7.71428571,   94.13994169],
       [   7.85714286,   96.89504373],
       [   8.        ,  100.        ],
       [   8.14285714,  103.47230321],
       [   8.28571429,  107.32944606],
       [   8.42857143,  111.58892128],
       [   8.57142857,  116.26822157],
       [   8.71428571,  121.38483965],
       [   8.85714286,  126.95626822],
       [   9.        ,  133.        ],
       [   9.        ,    0.        ],
       [   2.        ,    0.        ]])

In [75]: pth.codes
Out[75]:
array([ 1,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
        2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
        2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
        2, 79], dtype=uint8)

which is is both cases closed due to the `closed` kwarg on the `Polygon`
`__init__`, if you change this to `False` you get back open paths.

The backend API has not changed between 1.4.3 and current master, you
should be able to develop a backend which will work with both. If you have
found API breaks we would really like to know about them!

Tom

···

On Fri, Aug 14, 2015 at 11:26 AM Jens Nielsen <jenshnielsen at gmail.com> wrote:

I can reproduce the problem with the GTK backend but not the GTKAgg or
GTKCairo backends. Unless you have some specific reason for using the GTK
backend I would strongly recommend against it. It is untested,
unmaintained and officially discouraged:
http://matplotlib.org/faq/usage_faq.html#what-is-a-backend I would
recommend you to use GTKAgg instead.

Furthermore the GDK toolkit, used in that backend, has been dropped from
GTK3 which officially uses Cairo internally and thus Matplotlib only
supports GTK3Agg and GTK3Cario

I guess the issue is likely a result of the large C++ refactoring in
master.

best
Jens

fre. 14. aug. 2015 kl. 15.21 skrev Thomas Caswell <tcaswell at gmail.com>:

Please keep all discussion on the mailing list (
matplotlib-devel at python.org).

Being pedantic about versions, current master is v1.5.0dev1 , not 1.5.1
(which will be the first bug fix release in the 1.5 series which may or may
not ever happen).

I don't have gtk installed to easily test this and it looks fine with
qt4agg, can you provide a minimal script and the code paths from a simple
polygon?

Tom

On Fri, Aug 14, 2015 at 9:05 AM Andr?s Vargas <andnovar at gmail.com> wrote:

Hello Tom,

Thanks for your prompt reply. I am using the function path.to_polygons()
and that gives me a non-closed path in matplotlib 1.4.3 (last stable
release) and give me a closed path in 1.5.1 (master from github). You can
see the problem if you run integral_demo.py with matplotlib 1.5.1 master
with matplotlib.use('gtk').

Thanks, Andres

On Fri, Aug 14, 2015 at 8:13 AM, Thomas Caswell <tcaswell at gmail.com> >>> wrote:

Did you mean 1.4.1 instead of 1.5.1 ?

Exactly which paths are you looking at and how are you generating then
on the mpl side? We have many ways to generate the paths and there maybe
inconsistence in how closed paths are handled.

Tom

On Wed, Aug 12, 2015, 1:57 PM Andr?s Vargas <andnovar at gmail.com> wrote:

Hello,

My name is Andres I am developing a backend for kivy. I was initially
developing for 1.5.1 and I found that the paths are coming with the initial
vertex at the end of the list. Does anyone know whether this is change in
the way paths are sent ? and how can be fixed coming from 1.4.3 since I am
developing the backend for that version.

Thanks, Andres

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andnovar · September 9, 2015, 9:00am

Thomas,

The problem is not in the Polygon class, rather it is in the method
convert_path_to_polygons from _path.h in matplotlib 1.5dev1 and _path.cpp
in matplotlib 1.4.3 . I print the polygons result from converting the path
to polygon in the files attached. The polygons from this figure ->

There is something definitely not right from what you can see in the files.
What I did temporary is that when is version >= 1.5 it will not consider
the last two vertices which seems repeated in most of the cases.

I got another question as well, I am getting troubles with the onHilite
event (motion_notify_event causes app to freeze · Issue #19 · kivy-garden/garden.matplotlib · GitHub). I think
it is related to the TimerBase. Can anyone tell me a little bit more about
the TimerBase.

Thanks, Andres

Andres,

Have you made any progress on this?

Using the code in integral_demo.py
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.patches import Polygon

def func(x):
    return (x - 3) * (x - 5) * (x - 7) + 85

a, b = 2, 9  # integral limits

# Make the shaded region
ix = np.linspace(a, b)
iy = func(ix)
verts = [(a, 0)] + list(zip(ix, iy)) + [(b, 0)]
poly = Polygon(verts, facecolor='0.9', edgecolor='0.5')
pth = poly.get_path()
which if you look at the vertices and codes on both 1.4.3 and current(ish)
master you get
In [73]: pth.vertices
Out[74]:
array([[   2.        ,    0.        ],
       [   2.        ,   70.        ],
       [   2.14285714,   73.10495627],
       [   2.28571429,   75.86005831],
       [   2.42857143,   78.28279883],
       [   2.57142857,   80.39067055],
       [   2.71428571,   82.20116618],
       [   2.85714286,   83.73177843],
       [   3.        ,   85.        ],
       [   3.14285714,   86.02332362],
       [   3.28571429,   86.81924198],
       [   3.42857143,   87.40524781],
       [   3.57142857,   87.79883382],
       [   3.71428571,   88.01749271],
       [   3.85714286,   88.0787172 ],
       [   4.        ,   88.        ],
       [   4.14285714,   87.79883382],
       [   4.28571429,   87.49271137],
       [   4.42857143,   87.09912536],
       [   4.57142857,   86.63556851],
       [   4.71428571,   86.11953353],
       [   4.85714286,   85.56851312],
       [   5.        ,   85.        ],
       [   5.14285714,   84.43148688],
       [   5.28571429,   83.88046647],
       [   5.42857143,   83.36443149],
       [   5.57142857,   82.90087464],
       [   5.71428571,   82.50728863],
       [   5.85714286,   82.20116618],
       [   6.        ,   82.        ],
       [   6.14285714,   81.9212828 ],
       [   6.28571429,   81.98250729],
       [   6.42857143,   82.20116618],
       [   6.57142857,   82.59475219],
       [   6.71428571,   83.18075802],
       [   6.85714286,   83.97667638],
       [   7.        ,   85.        ],
       [   7.14285714,   86.26822157],
       [   7.28571429,   87.79883382],
       [   7.42857143,   89.60932945],
       [   7.57142857,   91.71720117],
       [   7.71428571,   94.13994169],
       [   7.85714286,   96.89504373],
       [   8.        ,  100.        ],
       [   8.14285714,  103.47230321],
       [   8.28571429,  107.32944606],
       [   8.42857143,  111.58892128],
       [   8.57142857,  116.26822157],
       [   8.71428571,  121.38483965],
       [   8.85714286,  126.95626822],
       [   9.        ,  133.        ],
       [   9.        ,    0.        ],
       [   2.        ,    0.        ]])

In [75]: pth.codes
Out[75]:
array([ 1,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
        2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
        2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
        2, 79], dtype=uint8)
which is is both cases closed due to the `closed` kwarg on the `Polygon`
`__init__`, if you change this to `False` you get back open paths.

The backend API has not changed between 1.4.3 and current master, you
should be able to develop a backend which will work with both. If you have
found API breaks we would really like to know about them!

Tom

I can reproduce the problem with the GTK backend but not the GTKAgg or
GTKCairo backends. Unless you have some specific reason for using the GTK
backend I would strongly recommend against it. It is untested,
unmaintained and officially discouraged:
http://matplotlib.org/faq/usage_faq.html#what-is-a-backend I would
recommend you to use GTKAgg instead.

Furthermore the GDK toolkit, used in that backend, has been dropped from
GTK3 which officially uses Cairo internally and thus Matplotlib only
supports GTK3Agg and GTK3Cario

I guess the issue is likely a result of the large C++ refactoring in
master.

best
Jens

fre. 14. aug. 2015 kl. 15.21 skrev Thomas Caswell <tcaswell at gmail.com>:

Please keep all discussion on the mailing list (
matplotlib-devel at python.org).

Being pedantic about versions, current master is v1.5.0dev1 , not 1.5.1
(which will be the first bug fix release in the 1.5 series which may or may
not ever happen).

I don't have gtk installed to easily test this and it looks fine with
qt4agg, can you provide a minimal script and the code paths from a simple
polygon?

Tom

Hello Tom,

Thanks for your prompt reply. I am using the function
path.to_polygons() and that gives me a non-closed path in matplotlib 1.4.3
(last stable release) and give me a closed path in 1.5.1 (master from
github). You can see the problem if you run integral_demo.py with
matplotlib 1.5.1 master with matplotlib.use('gtk').

Thanks, Andres

Did you mean 1.4.1 instead of 1.5.1 ?

Exactly which paths are you looking at and how are you generating then
on the mpl side? We have many ways to generate the paths and there maybe
inconsistence in how closed paths are handled.

Tom

Hello,

My name is Andres I am developing a backend for kivy. I was initially
developing for 1.5.1 and I found that the paths are coming with the initial
vertex at the end of the list. Does anyone know whether this is change in
the way paths are sent ? and how can be fixed coming from 1.4.3 since I am
developing the backend for that version.

Thanks, Andres

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[array([[ 0., 0.],
[ 101., 0.]]), array([[ 0., 101.],
[ 0., 0.]])]

[array([[ 80., 48.],
[ 101., 48.]]), array([[ 80., 101.],
[ 80., 48.]])]

[array([[ 179.2, 48. ]])]

[array([[ 278.4, 48. ]])]

[array([[ 377.6, 48. ]])]

[array([[ 476.8, 48. ]])]

[array([[ 114.72, 48. ]])]

[array([[ 213.92, 48. ]])]

[array([[ 313.12, 48. ]])]

[array([[ 412.32, 48. ]])]

[array([[ 511.52, 48. ]])]

[array([[ 97.36, 220.8 ]])]

[array([[ 196.56, 355.2 ]])]

[array([[ 295.76, 297.6 ]])]

[array([[ 394.96, 374.4 ]])]

[array([[ 494.16, 288. ]])]

[array([[ 132.08, 259.2 ]])]

[array([[ 231.28, 307.2 ]])]

[array([[ 330.48, 355.2 ]])]

[array([[ 429.68, 211.2 ]])]

[array([[ 528.88, 259.2 ]])]

[array([[ 80., 432.]])]

[array([[ 576., 48.]])]

[array([[ 80., 48.],
[ 80., 101.]])]

[array([[ 80., 48.],
[ 101., 48.]])]

[array([[ 457.4, 369.2]])]

[array([[ 463.8, 401.6]])]

[array([[ 463.8, 376.6]])]

[array([[ 0., 0.],
[ 101., 0.]]), array([[ 0., 101.],
[ 0., 0.]])]

[array([[ 80., 48.],
[ 101., 48.]]), array([[ 80., 101.],
[ 80., 48.]])]

[array([[ 179.2, 48. ]])]

[array([[ 278.4, 48. ]])]

[array([[ 377.6, 48. ]])]

[array([[ 476.8, 48. ]])]

[array([[ 114.72, 48. ]])]

[array([[ 213.92, 48. ]])]

[array([[ 313.12, 48. ]])]

[array([[ 412.32, 48. ]])]

[array([[ 511.52, 48. ]])]

[array([[ 97.36, 220.8 ]])]

[array([[ 196.56, 355.2 ]])]

[array([[ 295.76, 297.6 ]])]

[array([[ 394.96, 374.4 ]])]

[array([[ 494.16, 288. ]])]

[array([[ 132.08, 259.2 ]])]

[array([[ 231.28, 307.2 ]])]

[array([[ 330.48, 355.2 ]])]

[array([[ 429.68, 211.2 ]])]

[array([[ 528.88, 259.2 ]])]

[array([[ 80., 432.]])]

[array([[ 576., 48.]])]

[array([[ 80., 48.],
[ 80., 101.]])]

[array([[ 80., 48.],
[ 101., 48.]])]

[array([[ 457.4, 369.2]])]

[array([[ 463.8, 401.6]])]

[array([[ 463.8, 376.6]])]

[array([[ 0., 0.],
       [ 500., 0.],
       [ 500., 450.],
       [ 0., 450.],
       [ 0., 0.]])]

[array([[ 62.5, 45. ],
       [ 450. , 45. ],
       [ 450. , 405. ],
       [ 62.5, 405. ],
       [ 62.5, 45. ]])]

[array([[ 62.5 , 45. ],
       [ 89.625, 45. ],
       [ 89.625, 225. ],
       [ 62.5 , 225. ],
       [ 62.5 , 45. ]])]

[array([[ 140. , 45. ],
       [ 167.125, 45. ],
       [ 167.125, 360. ],
       [ 140. , 360. ],
       [ 140. , 45. ]])]

[array([[ 217.5 , 45. ],
       [ 244.625, 45. ],
       [ 244.625, 315. ],
       [ 217.5 , 315. ],
       [ 217.5 , 45. ]])]

[array([[ 295. , 45. ],
       [ 322.125, 45. ],
       [ 322.125, 360. ],
       [ 295. , 360. ],
       [ 295. , 45. ]])]

[array([[ 372.5 , 45. ],
       [ 399.625, 45. ],
       [ 399.625, 288. ],
       [ 372.5 , 288. ],
       [ 372.5 , 45. ]])]

[array([[ 89.625, 45. ],
       [ 116.75 , 45. ],
       [ 116.75 , 270. ],
       [ 89.625, 270. ],
       [ 89.625, 45. ]])]

[array([[ 167.125, 45. ],
       [ 194.25 , 45. ],
       [ 194.25 , 333. ],
       [ 167.125, 333. ],
       [ 167.125, 45. ]])]

[array([[ 244.625, 45. ],
       [ 271.75 , 45. ],
       [ 271.75 , 351. ],
       [ 244.625, 351. ],
       [ 244.625, 45. ]])]

[array([[ 322.125, 45. ],
       [ 349.25 , 45. ],
       [ 349.25 , 225. ],
       [ 322.125, 225. ],
       [ 322.125, 45. ]])]

[array([[ 399.625, 45. ],
       [ 426.75 , 45. ],
       [ 426.75 , 270. ],
       [ 399.625, 270. ],
       [ 399.625, 45. ]])]

[array([[ 76.0625, 207. ],
[ 76.0625, 243. ]])]

[array([[ 153.5625, 333. ],
[ 153.5625, 387. ]])]

[array([[ 231.0625, 279. ],
[ 231.0625, 351. ]])]

[array([[ 308.5625, 351. ],
[ 308.5625, 369. ]])]

[array([[ 386.0625, 270. ],
[ 386.0625, 306. ]])]

[array([[ 103.1875, 243. ],
[ 103.1875, 297. ]])]

[array([[ 180.6875, 288. ],
[ 180.6875, 378. ]])]

[array([[ 258.1875, 333. ],
[ 258.1875, 369. ]])]

[array([[ 335.6875, 198. ],
[ 335.6875, 252. ]])]

[array([[ 413.1875, 243. ],
[ 413.1875, 297. ]])]

[array([[ 62.5, 405. ],
[ 450. , 405. ]])]

[array([[ 450., 45.],
[ 450., 405.]])]

[array([[ 62.5, 45. ],
[ 62.5, 405. ]])]

[array([[ 62.5, 45. ],
[ 450. , 45. ]])]

[array([[ 331.4, 342.2],
       [ 442. , 342.2],
       [ 442. , 397. ],
       [ 331.4, 397. ],
       [ 331.4, 342.2]])]

[array([[ 337.8, 374.6],
       [ 369.8, 374.6],
       [ 369.8, 385.8],
       [ 337.8, 385.8],
       [ 337.8, 374.6]])]

[array([[ 337.8, 349.6],
       [ 369.8, 349.6],
       [ 369.8, 360.8],
       [ 337.8, 360.8],
       [ 337.8, 349.6]])]

-------------- next part --------------
[array([[ 0., 0.],
       [ 101., 0.],
       [ 0., 0.],
       [ 0., 0.]]), array([[ 0., 101.],
       [ 0., 101.],
       [ 0., 101.]]), array([[ 0., 0.],
       [ 0., 0.]])]

[array([[ 80., 48.],
       [ 101., 48.],
       [ 80., 48.],
       [ 80., 48.]]), array([[ 80., 101.],
       [ 80., 101.],
       [ 80., 101.]]), array([[ 80., 48.],
       [ 80., 48.]])]

[array([[ 179.2, 48. ],
[ 179.2, 48. ]])]

[array([[ 278.4, 48. ],
[ 278.4, 48. ]])]

[array([[ 377.6, 48. ],
[ 377.6, 48. ]])]

[array([[ 476.8, 48. ],
[ 476.8, 48. ]])]

[array([[ 114.72, 48. ],
[ 114.72, 48. ]])]

[array([[ 213.92, 48. ],
[ 213.92, 48. ]])]

[array([[ 313.12, 48. ],
[ 313.12, 48. ]])]

[array([[ 412.32, 48. ],
[ 412.32, 48. ]])]

[array([[ 511.52, 48. ],
[ 511.52, 48. ]])]

[array([[ 97.36, 220.8 ],
[ 97.36, 220.8 ]])]

[array([[ 196.56, 355.2 ],
[ 196.56, 355.2 ]])]

[array([[ 295.76, 297.6 ],
[ 295.76, 297.6 ]])]

[array([[ 394.96, 374.4 ],
[ 394.96, 374.4 ]])]

[array([[ 494.16, 288. ],
[ 494.16, 288. ]])]

[array([[ 132.08, 259.2 ],
[ 132.08, 259.2 ]])]

[array([[ 231.28, 307.2 ],
[ 231.28, 307.2 ]])]

[array([[ 330.48, 355.2 ],
[ 330.48, 355.2 ]])]

[array([[ 429.68, 211.2 ],
[ 429.68, 211.2 ]])]

[array([[ 528.88, 259.2 ],
[ 528.88, 259.2 ]])]

[array([[ 80., 432.],
[ 80., 432.]])]

[array([[ 576., 48.],
[ 576., 48.]])]

[array([[ 80., 48.],
[ 101., 48.],
[ 80., 48.]])]

[array([[ 80., 48.],
[ 80., 101.],
[ 80., 48.]])]

[array([[ 457.4, 369.2],
[ 457.4, 369.2]])]

[array([[ 463.8, 401.6],
[ 463.8, 401.6]])]

[array([[ 463.8, 376.6],
[ 463.8, 376.6]])]

[array([[ 0., 0.],
       [ 101., 0.],
       [ 0., 0.],
       [ 0., 0.]]), array([[ 0., 101.],
       [ 0., 101.],
       [ 0., 101.]]), array([[ 0., 0.],
       [ 0., 0.]])]

[array([[ 80., 48.],
       [ 101., 48.],
       [ 80., 48.],
       [ 80., 48.]]), array([[ 80., 101.],
       [ 80., 101.],
       [ 80., 101.]]), array([[ 80., 48.],
       [ 80., 48.]])]

[array([[ 179.2, 48. ],
[ 179.2, 48. ]])]

[array([[ 278.4, 48. ],
[ 278.4, 48. ]])]

[array([[ 377.6, 48. ],
[ 377.6, 48. ]])]

[array([[ 476.8, 48. ],
[ 476.8, 48. ]])]

[array([[ 114.72, 48. ],
[ 114.72, 48. ]])]

[array([[ 213.92, 48. ],
[ 213.92, 48. ]])]

[array([[ 313.12, 48. ],
[ 313.12, 48. ]])]

[array([[ 412.32, 48. ],
[ 412.32, 48. ]])]

[array([[ 511.52, 48. ],
[ 511.52, 48. ]])]

[array([[ 97.36, 220.8 ],
[ 97.36, 220.8 ]])]

[array([[ 196.56, 355.2 ],
[ 196.56, 355.2 ]])]

[array([[ 295.76, 297.6 ],
[ 295.76, 297.6 ]])]

[array([[ 394.96, 374.4 ],
[ 394.96, 374.4 ]])]

[array([[ 494.16, 288. ],
[ 494.16, 288. ]])]

[array([[ 132.08, 259.2 ],
[ 132.08, 259.2 ]])]

[array([[ 231.28, 307.2 ],
[ 231.28, 307.2 ]])]

[array([[ 330.48, 355.2 ],
[ 330.48, 355.2 ]])]

[array([[ 429.68, 211.2 ],
[ 429.68, 211.2 ]])]

[array([[ 528.88, 259.2 ],
[ 528.88, 259.2 ]])]

[array([[ 80., 432.],
[ 80., 432.]])]

[array([[ 576., 48.],
[ 576., 48.]])]

[array([[ 80., 48.],
[ 101., 48.],
[ 80., 48.]])]

[array([[ 80., 48.],
[ 80., 101.],
[ 80., 48.]])]

[array([[ 457.4, 369.2],
[ 457.4, 369.2]])]

[array([[ 463.8, 401.6],
[ 463.8, 401.6]])]

[array([[ 463.8, 376.6],
[ 463.8, 376.6]])]

[array([[ 0., 0.],
       [ 500., 0.],
       [ 500., 450.],
       [ 0., 450.],
       [ 0., 0.],
       [ 0., 0.],
       [ 0., 0.]])]

[array([[ 62.5, 45. ],
       [ 450. , 45. ],
       [ 450. , 405. ],
       [ 62.5, 405. ],
       [ 62.5, 45. ],
       [ 62.5, 45. ],
       [ 62.5, 45. ]])]

[array([[ 62.5 , 45. ],
       [ 89.625, 45. ],
       [ 89.625, 225. ],
       [ 62.5 , 225. ],
       [ 62.5 , 45. ],
       [ 62.5 , 45. ],
       [ 62.5 , 45. ]])]

[array([[ 140. , 45. ],
       [ 167.125, 45. ],
       [ 167.125, 360. ],
       [ 140. , 360. ],
       [ 140. , 45. ],
       [ 140. , 45. ],
       [ 140. , 45. ]])]

[array([[ 217.5 , 45. ],
       [ 244.625, 45. ],
       [ 244.625, 315. ],
       [ 217.5 , 315. ],
       [ 217.5 , 45. ],
       [ 217.5 , 45. ],
       [ 217.5 , 45. ]])]

[array([[ 295. , 45. ],
       [ 322.125, 45. ],
       [ 322.125, 360. ],
       [ 295. , 360. ],
       [ 295. , 45. ],
       [ 295. , 45. ],
       [ 295. , 45. ]])]

[array([[ 372.5 , 45. ],
       [ 399.625, 45. ],
       [ 399.625, 288. ],
       [ 372.5 , 288. ],
       [ 372.5 , 45. ],
       [ 372.5 , 45. ],
       [ 372.5 , 45. ]])]

[array([[ 89.625, 45. ],
       [ 116.75 , 45. ],
       [ 116.75 , 270. ],
       [ 89.625, 270. ],
       [ 89.625, 45. ],
       [ 89.625, 45. ],
       [ 89.625, 45. ]])]

[array([[ 167.125, 45. ],
       [ 194.25 , 45. ],
       [ 194.25 , 333. ],
       [ 167.125, 333. ],
       [ 167.125, 45. ],
       [ 167.125, 45. ],
       [ 167.125, 45. ]])]

[array([[ 244.625, 45. ],
       [ 271.75 , 45. ],
       [ 271.75 , 351. ],
       [ 244.625, 351. ],
       [ 244.625, 45. ],
       [ 244.625, 45. ],
       [ 244.625, 45. ]])]

[array([[ 322.125, 45. ],
       [ 349.25 , 45. ],
       [ 349.25 , 225. ],
       [ 322.125, 225. ],
       [ 322.125, 45. ],
       [ 322.125, 45. ],
       [ 322.125, 45. ]])]

[array([[ 399.625, 45. ],
       [ 426.75 , 45. ],
       [ 426.75 , 270. ],
       [ 399.625, 270. ],
       [ 399.625, 45. ],
       [ 399.625, 45. ],
       [ 399.625, 45. ]])]

[array([[ 76.0625, 207. ],
[ 76.0625, 243. ],
[ 76.0625, 207. ]])]

[array([[ 153.5625, 333. ],
[ 153.5625, 387. ],
[ 153.5625, 333. ]])]

[array([[ 231.0625, 279. ],
[ 231.0625, 351. ],
[ 231.0625, 279. ]])]

[array([[ 308.5625, 351. ],
[ 308.5625, 369. ],
[ 308.5625, 351. ]])]

[array([[ 386.0625, 270. ],
[ 386.0625, 306. ],
[ 386.0625, 270. ]])]

[array([[ 103.1875, 243. ],
[ 103.1875, 297. ],
[ 103.1875, 243. ]])]

[array([[ 180.6875, 288. ],
[ 180.6875, 378. ],
[ 180.6875, 288. ]])]

[array([[ 258.1875, 333. ],
[ 258.1875, 369. ],
[ 258.1875, 333. ]])]

[array([[ 335.6875, 198. ],
[ 335.6875, 252. ],
[ 335.6875, 198. ]])]

[array([[ 413.1875, 243. ],
[ 413.1875, 297. ],
[ 413.1875, 243. ]])]

[array([[ 62.5, 405. ],
[ 450. , 405. ],
[ 62.5, 405. ]])]

[array([[ 450., 45.],
[ 450., 405.],
[ 450., 45.]])]

[array([[ 62.5, 45. ],
[ 450. , 45. ],
[ 62.5, 45. ]])]

[array([[ 62.5, 45. ],
[ 62.5, 405. ],
[ 62.5, 45. ]])]

[array([[ 331.4, 342.2],
       [ 442. , 342.2],
       [ 442. , 397. ],
       [ 331.4, 397. ],
       [ 331.4, 342.2],
       [ 331.4, 342.2],
       [ 331.4, 342.2]])]

[array([[ 337.8, 374.6],
       [ 369.8, 374.6],
       [ 369.8, 385.8],
       [ 337.8, 385.8],
       [ 337.8, 374.6],
       [ 337.8, 374.6],
       [ 337.8, 374.6]])]

[array([[ 337.8, 349.6],
       [ 369.8, 349.6],
       [ 369.8, 360.8],
       [ 337.8, 360.8],
       [ 337.8, 349.6],
       [ 337.8, 349.6],
       [ 337.8, 349.6]])]

···

On Tue, Sep 8, 2015 at 8:22 PM, Thomas Caswell <tcaswell at gmail.com> wrote:

On Fri, Aug 14, 2015 at 11:26 AM Jens Nielsen <jenshnielsen at gmail.com> > wrote:

On Fri, Aug 14, 2015 at 9:05 AM Andr?s Vargas <andnovar at gmail.com> >>> wrote:

On Fri, Aug 14, 2015 at 8:13 AM, Thomas Caswell <tcaswell at gmail.com> >>>> wrote:

On Wed, Aug 12, 2015, 1:57 PM Andr?s Vargas <andnovar at gmail.com> >>>>> wrote:

tacaswell · September 12, 2015, 6:27pm

I did not understand that the issue was with the `Line2D` object, not with
the `Polygon` object is that example.

What are the path codes that go with those vertices? Does kivy not support
Bezier curves?

This is much easier if you include minimal runnable code snippets that
demonstrate the issue inline in the email.

Tom

···

On Fri, Sep 11, 2015 at 1:51 PM Andr?s Vargas <andnovar at gmail.com> wrote:

I am so sorry I did a wrong use of the reply button. I am currently on
1.5.dev1 and when I run from examples/showcase/integral_demo.py I see a
line from the last point to the initial as can be seen here
http://imagebin.ca/v/2C7X8CAKZN0g and this happens in all the paths that
are open.

This is how gtk is doing it:

draw_path.py - Pastebin.com

I am doing this:

draw_path_kivy.py - Pastebin.com

In 1.4.3 does not have this point at the end of the polygon path.

Thanks, Andres

On Fri, Aug 14, 2015 at 10:21 AM, Thomas Caswell <tcaswell at gmail.com> > wrote:

Please keep all discussion on the mailing list (
matplotlib-devel at python.org).

Being pedantic about versions, current master is v1.5.0dev1 , not 1.5.1
(which will be the first bug fix release in the 1.5 series which may or may
not ever happen).

I don't have gtk installed to easily test this and it looks fine with
qt4agg, can you provide a minimal script and the code paths from a simple
polygon?

Tom

On Fri, Aug 14, 2015 at 9:05 AM Andr?s Vargas <andnovar at gmail.com> wrote:

Hello Tom,

Thanks for your prompt reply. I am using the function path.to_polygons()
and that gives me a non-closed path in matplotlib 1.4.3 (last stable
release) and give me a closed path in 1.5.1 (master from github). You can
see the problem if you run integral_demo.py with matplotlib 1.5.1 master
with matplotlib.use('gtk').

Thanks, Andres

On Fri, Aug 14, 2015 at 8:13 AM, Thomas Caswell <tcaswell at gmail.com> >>> wrote:

Did you mean 1.4.1 instead of 1.5.1 ?

Exactly which paths are you looking at and how are you generating then
on the mpl side? We have many ways to generate the paths and there maybe
inconsistence in how closed paths are handled.

Tom

On Wed, Aug 12, 2015, 1:57 PM Andr?s Vargas <andnovar at gmail.com> wrote:

Hello,

My name is Andres I am developing a backend for kivy. I was initially
developing for 1.5.1 and I found that the paths are coming with the initial
vertex at the end of the list. Does anyone know whether this is change in
the way paths are sent ? and how can be fixed coming from 1.4.3 since I am
developing the backend for that version.

Thanks, Andres

------------------------------------------------------------------------------
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andnovar · September 12, 2015, 8:54pm

Thomas,

I convert everything to polygon and I decide whether to create a line or a
polygon based on the rgbFace. When rgbFace is None then I create a Mesh
else I create a Line. In 1.4.3 the line formed with the vertices is right
and in 1.5.1 comes with 2 other points repeated as initial points.
I did not use the kivy Bezier since matplotlib has this function that
computes Bezier lines from polygons. The problem is that this method
convert_path_to_polygons
is not being consistent from 1.4.3 to 1.5.1

github.com

andnovar/garden.matplotlib/blob/master/backend_kivy.py#L695


      
                                      bufferfmt='ubyte')
              else:
                  texture.blit_buffer(ftimage.as_rgba_str(), colorfmt='rgba',
                                      bufferfmt='ubyte')
              texture.flip_vertical()
              with self.widget.canvas:
                  Rectangle(texture=texture, pos=(x, y), size=(w, h))
          
          def draw_path(self, gc, path, transform, rgbFace=None):
              '''Produce the rendering of the graphics elements using
                 :class:`kivy.graphics.Line` and :class:`kivy.graphics.Mesh` kivy
                 graphics instructions. The paths are converted into polygons and
                 assigned either to a clip rectangle or to the same canvas for
                 rendering. Paths are received in matplotlib coordinates. The
                 aesthetics is defined by the `GraphicsContextKivy` gc.
              '''
              polygons = path.to_polygons(transform, self.widget.width,
                                          self.widget.height)
              list_canvas_instruction = self.get_path_instructions(gc, polygons,
                                          closed=True, rgbFace=rgbFace)
              for widget, instructions in list_canvas_instruction:

I will send a snippet later on if necessary.

···

--
Andres

On Sat, Sep 12, 2015 at 2:27 PM, Thomas Caswell <tcaswell at gmail.com> wrote:

I did not understand that the issue was with the `Line2D` object, not with
the `Polygon` object is that example.

What are the path codes that go with those vertices? Does kivy not
support Bezier curves?

This is much easier if you include minimal runnable code snippets that
demonstrate the issue inline in the email.

Tom

On Fri, Sep 11, 2015 at 1:51 PM Andr?s Vargas <andnovar at gmail.com> wrote:

I am so sorry I did a wrong use of the reply button. I am currently on
1.5.dev1 and when I run from examples/showcase/integral_demo.py I see a
line from the last point to the initial as can be seen here
http://imagebin.ca/v/2C7X8CAKZN0g and this happens in all the paths that
are open.

This is how gtk is doing it:

draw_path.py - Pastebin.com

I am doing this:

draw_path_kivy.py - Pastebin.com

In 1.4.3 does not have this point at the end of the polygon path.

Thanks, Andres

On Fri, Aug 14, 2015 at 10:21 AM, Thomas Caswell <tcaswell at gmail.com> >> wrote:

Please keep all discussion on the mailing list (
matplotlib-devel at python.org).

Being pedantic about versions, current master is v1.5.0dev1 , not 1.5.1
(which will be the first bug fix release in the 1.5 series which may or may
not ever happen).

I don't have gtk installed to easily test this and it looks fine with
qt4agg, can you provide a minimal script and the code paths from a simple
polygon?

Tom

On Fri, Aug 14, 2015 at 9:05 AM Andr?s Vargas <andnovar at gmail.com> >>> wrote:

Hello Tom,

Thanks for your prompt reply. I am using the function
path.to_polygons() and that gives me a non-closed path in matplotlib 1.4.3
(last stable release) and give me a closed path in 1.5.1 (master from
github). You can see the problem if you run integral_demo.py with
matplotlib 1.5.1 master with matplotlib.use('gtk').

Thanks, Andres

On Fri, Aug 14, 2015 at 8:13 AM, Thomas Caswell <tcaswell at gmail.com> >>>> wrote:

Did you mean 1.4.1 instead of 1.5.1 ?

Exactly which paths are you looking at and how are you generating then
on the mpl side? We have many ways to generate the paths and there maybe
inconsistence in how closed paths are handled.

Tom

On Wed, Aug 12, 2015, 1:57 PM Andr?s Vargas <andnovar at gmail.com> >>>>> wrote:

Hello,

My name is Andres I am developing a backend for kivy. I was initially
developing for 1.5.1 and I found that the paths are coming with the initial
vertex at the end of the list. Does anyone know whether this is change in
the way paths are sent ? and how can be fixed coming from 1.4.3 since I am
developing the backend for that version.

Thanks, Andres

------------------------------------------------------------------------------
_______________________________________________
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Matplotlib-devel at lists.sourceforge.net
matplotlib-devel List Signup and Options

_______________________________________________
Matplotlib-devel mailing list
Matplotlib-devel at python.org
Matplotlib-devel Info Page

-------------- next part --------------
An HTML attachment was scrubbed...
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tacaswell · September 12, 2015, 9:17pm

From the documentation in `convert_path_to_polygons` it is for use when the

target backend can not deal with Bezier curves. If kivy can deal with
Bezier directly I suggest using that instead.

On line 698 you are passing in `closed=True` (
https://github.com/andnovar/garden.matplotlib/blob/master/backend_kivy.py#L698),
is that intentional?

If you do

import matplotlib.path as mp
pth2 = mp.Path([[  0.,   0.],
                [  1.,  -1.],
                [  4.,  -2.],
                [  9.,  -3.],
                [ 16.,  -4.]], None)

print(pth2.to_polygons())

you get

[array([[ 0., 0.],
       [ 1., -1.],
       [ 4., -2.],
       [ 9., -3.],
       [ 16., -4.]])]

on both master and with 1.4.3

Can you provide a minimal example (like the one above) where
`to_polygons()` gives different results between 1.4.3 and master?

Tom

···

On Sat, Sep 12, 2015 at 4:54 PM Andr?s Vargas <andnovar at gmail.com> wrote:

Thomas,

I convert everything to polygon and I decide whether to create a line or a
polygon based on the rgbFace. When rgbFace is None then I create a Mesh
else I create a Line. In 1.4.3 the line formed with the vertices is right
and in 1.5.1 comes with 2 other points repeated as initial points.
I did not use the kivy Bezier since matplotlib has this function that
computes Bezier lines from polygons. The problem is that this method convert_path_to_polygons
is not being consistent from 1.4.3 to 1.5.1

https://github.com/andnovar/garden.matplotlib/blob/master/backend_kivy.py#L695

I will send a snippet later on if necessary.

--
Andres

On Sat, Sep 12, 2015 at 2:27 PM, Thomas Caswell <tcaswell at gmail.com> > wrote:

I did not understand that the issue was with the `Line2D` object, not
with the `Polygon` object is that example.

What are the path codes that go with those vertices? Does kivy not
support Bezier curves?

This is much easier if you include minimal runnable code snippets that
demonstrate the issue inline in the email.

Tom

On Fri, Sep 11, 2015 at 1:51 PM Andr?s Vargas <andnovar at gmail.com> wrote:

I am so sorry I did a wrong use of the reply button. I am currently on
1.5.dev1 and when I run from examples/showcase/integral_demo.py I see a
line from the last point to the initial as can be seen here
http://imagebin.ca/v/2C7X8CAKZN0g and this happens in all the paths
that are open.

This is how gtk is doing it:

draw_path.py - Pastebin.com

I am doing this:

draw_path_kivy.py - Pastebin.com

In 1.4.3 does not have this point at the end of the polygon path.

Thanks, Andres

On Fri, Aug 14, 2015 at 10:21 AM, Thomas Caswell <tcaswell at gmail.com> >>> wrote:

Please keep all discussion on the mailing list (
matplotlib-devel at python.org).

Being pedantic about versions, current master is v1.5.0dev1 , not 1.5.1
(which will be the first bug fix release in the 1.5 series which may or may
not ever happen).

I don't have gtk installed to easily test this and it looks fine with
qt4agg, can you provide a minimal script and the code paths from a simple
polygon?

Tom

On Fri, Aug 14, 2015 at 9:05 AM Andr?s Vargas <andnovar at gmail.com> >>>> wrote:

Hello Tom,

Thanks for your prompt reply. I am using the function
path.to_polygons() and that gives me a non-closed path in matplotlib 1.4.3
(last stable release) and give me a closed path in 1.5.1 (master from
github). You can see the problem if you run integral_demo.py with
matplotlib 1.5.1 master with matplotlib.use('gtk').

Thanks, Andres

On Fri, Aug 14, 2015 at 8:13 AM, Thomas Caswell <tcaswell at gmail.com> >>>>> wrote:

Did you mean 1.4.1 instead of 1.5.1 ?

Exactly which paths are you looking at and how are you generating
then on the mpl side? We have many ways to generate the paths and there
maybe inconsistence in how closed paths are handled.

Tom

On Wed, Aug 12, 2015, 1:57 PM Andr?s Vargas <andnovar at gmail.com> >>>>>> wrote:

Hello,

My name is Andres I am developing a backend for kivy. I was
initially developing for 1.5.1 and I found that the paths are coming with
the initial vertex at the end of the list. Does anyone know whether this is
change in the way paths are sent ? and how can be fixed coming from 1.4.3
since I am developing the backend for that version.

Thanks, Andres

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