[Matplotlib-users] PolyCollection and transforms
I am trying to animate the movement of a polygon and thought a sound approach would be to in a loop where I redraw after altering the offsets value. However I seem to not be able to scale the polygon correctly. Here is an example of only trying to place a polygon (square) at 1,1. You can see the translation is correct, but the scaling is wrong--the polygon is only about a pixel high & wide. Dave -- import pylab as P from matplotlib import collections, axes, transforms import matplotlib.numerix as N fig = P.figure() a = fig.add_subplot(1,1,1) verts = N.array([[0,0],[1,0],[1,1],[0,1]]) offsets = [[1,1]] col = collections.PolyCollection([verts], offsets=offsets, transOffset=a.transData) a.add_collection(col) trans = transforms.scale_transform(transforms.Value(1),transforms.Value(1)) col.set_transform(trans) a.set_xlim([-5,5]) a.set_ylim([-5,5]) P.show() -- - SF.Net email is sponsored by: The Future of Linux Business White Paper from Novell. From the desktop to the data center, Linux is going mainstream. Let it simplify your IT future. http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Drawing filled circles (discs)
In the solution I gave, CirclePolygon has a resolution argument for
number of vertices to approximate the circle (default=20). You could
increase that value to some more appropriate level:
import matplotlib
from matplotlib.patches import CirclePolygon
from matplotlib.collections import PolyCollection
import pylab
fig=pylab.figure()
ax=fig.add_subplot(111)
resolution = 50 # the number of vertices
N = 20
x = pylab.rand(N)
y = pylab.rand(N)
radii = 0.1*pylab.rand(N)
colors = 100*pylab.rand(N)
verts = []
for x1,y1,r in zip(x, y, radii):
circle = CirclePolygon((x1,y1), r, resolution)
verts.append(circle.get_verts())
p = PolyCollection(verts, cmap=matplotlib.cm.jet)
p.set_array(pylab.array(colors))
ax.add_patch(p)
pylab.colorbar(p)
ax.axis('equal')
pylab.show()
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
sidimok
Sent: Thursday, September 20, 2007 4:59 AM
To: matplotlib-users@lists.sourceforge.net
Subject: Re: [Matplotlib-users] Drawing filled circles (discs)
Mika, David P (GE, Research) wrote:
>
> How about this solution? I'm a complete newbe, but this seems to do
> the trick. I didn't see a CircleCollection so I used CirclePolygon to
> generate vertices for a circle; these I grab and toss into a
> PolyCollection. Enjoy, Dave
>
>
Hi all!
Thank you very much indeed for the help, both solutions work like a
charm.
However Dave's one gives rough cirlces, approximated by polygones, which
is not very accurate for my buisness. May I ask how to create a
circleCollection as Jouni "The Expert" proposed?
You can find below one of my plottings rendered by Jouni's first trick.
http://www.nabble.com/file/p12793350/image.png
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Re: [Matplotlib-users] Drawing filled circles (discs)
How about this solution? I'm a complete newbe, but this seems to do the trick.
I didn't see a CircleCollection so I used CirclePolygon to generate vertices
for a circle; these I grab and toss into a PolyCollection. Enjoy, Dave
import matplotlib
from matplotlib.patches import CirclePolygon from matplotlib.collections import
PolyCollection import pylab
fig=pylab.figure()
ax=fig.add_subplot(111)
N = 20
x = pylab.rand(N)
y = pylab.rand(N)
radii = 0.1*pylab.rand(N)
colors = 100*pylab.rand(N)
verts = []
for x1,y1,r in zip(x, y, radii):
circle = CirclePolygon((x1,y1), r)
verts.append(circle.get_verts())
p = PolyCollection(verts, cmap=matplotlib.cm.jet)
p.set_array(pylab.array(colors))
ax.add_patch(p)
pylab.colorbar(p)
ax.axis('equal')
pylab.show()
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jouni K. Seppänen
Sent: Wednesday, September 19, 2007 11:03 AM
To: matplotlib-users@lists.sourceforge.net
Subject: Re: [Matplotlib-users] Drawing filled circles (discs)
sidimok <[EMAIL PROTECTED]> writes:
> Well, let's take the one you've proposed the last time. How than can i
> put a colorbar beside the plot?
Add in the imports
from matplotlib.colorbar import ColorbarBase, make_axes
and change the myscatter function to
def myscatter(ax, colormap, x, y, radii, colors):
for x1,y1,r,c in zip(x, y, radii, colormap(colors)):
ax.add_patch(Circle((x1,y1), r, fc=c))
cax, _ = make_axes(ax)
ColorbarBase(cax, cmap=colormap)
A better solution is probably to implement a CircleCollection similarly to the
other collections.
--
Jouni K. Seppänen
http://www.iki.fi/jks
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