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

2011-07-21 Thread robert rottermann 
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

2011-07-21 Thread Paul Ivanov 
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,
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