from matplotlib.pyplot import figure,show
from numpy import arange,pi,cos,sin,pi
from numpy.random import rand
# unit area ellipse
rx, ry = 3., 1.
area = rx * ry * pi
theta = arange(0, 2*pi+0.01, 0.1)
verts = zip(rx/area*cos(theta), ry/area*sin(theta))
x,y,s,c = rand(4, 30)
s*= 10**2.
fig = figure()
ax = fig.add_subplot(111)
ax.scatter(x,y,s,c,marker=None,verts =verts)
show()
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