matplotlib-users

[Matplotlib-users] hot to draw a line connecting a list of points

[robert r. <ro...@re...>]

hi there,

I would like to draw a a set of lines on top of an image.
Somehow I do not get the result I want

these are the points ((267, 140), (380, 773), (267, 958))

one of my divers atempts is:

pic = plt.imread('../hlwd/effizienz_balken_01.jpg')
pic = np.fliplr(np.rot90(pic, k=2))
plt.imshow(pic)

frame1 = plt.gca()

lx = []
ly = []
for pt in ((267, 140), (380, 773), (267, 958)):
     lx.append(pt[0])
     ly.append(pt[1])
x,y = np.array([lx, ly])
line = mlines.Line2D(x, y, lw=5., alpha=0.4)

frame1.add_line(line)

plt.show()

which produces on line instad of two.

thanks for any pointers
robert

Re: [Matplotlib-users] hot to draw a line connecting a list of points

[robert r. <ro...@re...>]

who ever migth be interested:
I achieved my goal in drawing lines trough a set of points using the path modul.

http://matplotlib.sourceforge.net/users/path_tutorial.html

robert
On 20.07.2011 20:49, robert rottermann wrote:
> hi there,
>
> I would like to draw a a set of lines on top of an image.
> Somehow I do not get the result I want
>
> these are the points ((267, 140), (380, 773), (267, 958))
>
> one of my divers atempts is:
>
> pic = plt.imread('../hlwd/effizienz_balken_01.jpg')
> pic = np.fliplr(np.rot90(pic, k=2))
> plt.imshow(pic)
>
> frame1 = plt.gca()
>
> lx = []
> ly = []
> for pt in ((267, 140), (380, 773), (267, 958)):
>       lx.append(pt[0])
>       ly.append(pt[1])
> x,y = np.array([lx, ly])
> line = mlines.Line2D(x, y, lw=5., alpha=0.4)
>
> frame1.add_line(line)
>
> plt.show()
>
> which produces on line instad of two.
>
> thanks for any pointers
> robert
>
>
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Re: [Matplotlib-users] hot to draw a line connecting a list of points

[Paul I. <piv...@gm...>]

Hi Robert,

robert rottermann, on 2011-07-21 11:25,  wrote:
> who ever migth be interested:
> I achieved my goal in drawing lines trough a set of points using the path modul.
> 
> http://matplotlib.sourceforge.net/users/path_tutorial.html

Unless there were other considerations for getting this plot, it
really didn't have to be this complicated, read on.
 
> On 20.07.2011 20:49, robert rottermann wrote:
> > frame1 = plt.gca()
> > lx = []
> > ly = []
> > for pt in ((267, 140), (380, 773), (267, 958)):
> >       lx.append(pt[0])
> >       ly.append(pt[1])
> > x,y = np.array([lx, ly])
> > line = mlines.Line2D(x, y, lw=5., alpha=0.4)
> > frame1.add_line(line)

The above can be done with just two lines:
x,y = zip(*((267, 140), (380, 773), (267, 958)))
1.plot(x,y)

best,
-- 
Paul Ivanov
314 address only used for lists,  off-list direct email at:
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