Michael Droettboom <md...@stsci.edu> writes: > Passing solid_joinstyle='bevel' does resolve the problem on both 0.91.x > and 0.98.x. Additionally, path simplification (which is a new feature > on 0.98.x) also resolves this problem (set rcParam path.simplify to True).
It seems that agg and pdf have different ways to render small angles when the join style is 'miter'. Pdf has a limit (settable in the pdf file) beyond which it reverts to bevel-style angles, agg seems to always do the miter join but cuts it off at some distance. Here's a test script, and screenshots of (a part of) the agg and pdf outputs when the join style is 'miter'. -- Jouni K. Seppänen http://www.iki.fi/jks
#!/usr/bin/env python
import numpy as np
import matplotlib
import pylab
def plot_angle(ax, x, y, angle, style):
phi = angle/180*np.pi
xx = [x+.5,x,x+.5*np.cos(phi)]
yy = [y,y,y+.5*np.sin(phi)]
ax.plot(xx, yy, lw=8, color='blue', solid_joinstyle=style)
ax.plot(xx[1:], yy[1:], lw=1, color='black')
ax.plot(xx[1::-1], yy[1::-1], lw=1, color='black')
ax.plot(xx[1:2], yy[1:2], 'o', color='red', markersize=3)
ax.text(x,y+.2,'%.0f degrees' % angle)
for style in ('miter', 'round', 'bevel'):
fig = pylab.figure()
ax = fig.add_subplot(111)
for i in range(16):
plot_angle(ax, i%4, i//4, i+1., style)
ax.set_xlim(-.5,4)
ax.set_ylim(-.5,4)
fig.savefig('joinstyle_'+style+'.png', dpi=150)
fig.savefig('joinstyle_'+style+'.pdf')
<<inline: agg_miter.png>>
<<inline: pdf_miter.png>>
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