[Matplotlib-users] Superimpose circles on a contourf plot

[SilverSurfer]

Dear all
I am new to matplotlib and python. Up until now i was able to achieve what i
wanted, but now i run into a weird problem. If i superimpose markers onto a
countourf plot they change their size when i zoom into and area off the
plot. 
The information i use to plot the positions of the circles is gathered from
ASE (Atomic Simulation Environment ).

I will first try to outline my code without suppling a MWE as this would be
hard to do at the moment:
__________________________
.....
from matplotlib import pyplot
from matplotlib.patches import Circle
from ase.io import read, write
from ase import Atom
from ase.atoms import Atoms
import pylab



#xarray,yarray are the x and y coordinates ,DATA contains a density at this
point
niso=1#min max value
ncontours=512# number off contours
###ploting starts here

myplot =
pylab.contourf(xarray,yarray,DATA,ncontours,antialiased=False,cmap=my_cmap,vmin=-niso,vmax=niso)

atoms=read('somedata', format="vasp")

for atom in atoms
	color = my_colors_DCLN[atom.number]
	radius = radii[atom.number]
	struc = pylab.plot(atom.x, atom.y, color='black', linestyle='solid',
marker='o', markerfacecolor=color, markersize=(1.2+radius*3.8),alpha=0.45)
	#circle = Circle((atom.x, atom.y), (radius/3.5),
facecolor=color,edgecolor='k', linewidth=0.4)#alpha=10)
	#ax.add_patch(circle))

#ax.axis('equal')
#ax.set_xticks([])
#ax.set_yticks([])
#ax.axis('off')




density_plot   
pylab.axis('image')
plt.Figure()

plt.draw() 


pylab.show()
_______________________

If i use the normal markers from matplotlib everything works correct. My
DATA  that i plot with contourf has the same dimensions as the atoms object.
So i only need to have the xy coordinates of this object.
I can plot the atoms object fine if i do it like this:

____________
import numpy as np
from matplotlib import pyplot
from ase.lattice.surface import fcc111
from ase import Atom
from ase.data import covalent_radii as radii
from ase.data.colors import jmol_colors
from matplotlib.patches import Circle
from ase.io import read, write
fig, ax = pyplot.subplots()


atoms = read('somedata', format="vasp")





for atom in atoms:
	color = my_colors[atom.number]
	radius = radii[atom.number]
	circle = Circle((atom.x, atom.y), (radius), facecolor=color,edgecolor='k',
linewidth=0.4)
	ax.add_patch(circle)

# Enforce the circles are round (equal x and y scales) and turn off
# tickmarks.
ax.axis('equal')
ax.set_xticks([])
ax.set_yticks([])
ax.axis('off')

fig.savefig('out.png',dpi=300)

pyplot.draw() 


pyplot.show()
_____________________


But i do not know what "fig, ax = pyplot.subplots()" does and how i could
incoporate this code in a way that i can supperimpose it to my contourf
plot. The Contourf plot is the important information and i just want to show
the positions of certian atoms ( circles) ontop of this plot.

Thank you in advance

fabian




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