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I founded answer for my question! It can be founded here. More results can be founded here. There is one graph as example below.

Thanks to anyone!

I founded answer for my question! It can be founded here. More results can be founded here. There is one graph as example below.

Thanks to anyone!

I founded answer for my question! It can be founded here. More results can be founded here. Thanks to anyone!

I founded answer for my question! It can be founded hereat http://commons.wikimedia.org/wiki/File:Conic_x%5E2%2B2xy%2By%5E2?8x%3D0.svg . More results can be founded hereat http://commons.wikimedia.org/wiki/Category:Made_with_Matplotlib . Thanks to anyone!

I founded answer for my question! It can be founded at http://commons.wikimedia.org/wiki/File:Conic_x%5E2%2B2xy%2By%5E2?8x%3D0.svg . More results can be founded at http://commons.wikimedia.org/wiki/Category:Made_with_Matplotlib . The code is below:

import matplotlib.pyplot as plt
plt.clf()
fig=figure(figsize=(5,3))
ax = fig.add_subplot(111)
for direction in ["left","bottom"]:
    ax.spines[direction].set_position('zero')
    ax.spines[direction].set_smart_bounds(True)
for direction in ["right","top"]:
    ax.spines[direction].set_color('none')
ax.xaxis.set_ticks_position('bottom')
ax.yaxis.set_ticks_position('left')
ax.grid(True)
plt.plot([0, 5, 10, 15,20,25], [0, 5, 0, -5, 0, 5], linewidth=2, color='blue')
plt.savefig('1.png')

Thanks to anyone!