hot to draw a line connecting a list of points

Community matplotlib-users
1

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

2

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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3

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:
http://pirsquared.org | GPG/PGP key id: 0x0F3E28F7