#!/usr/bin/python
# -*- coding: utf8 -*-

import matplotlib.pyplot as plt
import matplotlib as mpl
import numpy as np
from math import *

code_website = 'http://commons.wikimedia.org/wiki/User:Geek3/mplwp'
try:
    import mplwp
except ImportError, er:
    print 'ImportError:', er
    print 'You need to download mplwp.py from', code_website
    exit(1)

name = 'mplwp_arsinh_arcosh_artanh.svg'
fig = mplwp.fig_standard(mpl)

xlim = -4,4; fig.gca().set_xlim(xlim)
ylim = -3,3; fig.gca().set_ylim(ylim)
mplwp.mark_axeszero(fig.gca())

x1 = np.linspace(xlim[0], xlim[1], 5001)
y1 = [asinh(xx) for xx in x1]
plt.plot(x1, y1, label='arsinh', zorder=4)

y2 = np.linspace(0, acosh(xlim[1]), 5001)
x2 = [cosh(yy) for yy in y2]
plt.plot(x2, y2, label='arcosh', zorder=2)
plt.plot(x2[0], y2[0], 'o', color=fig.gca().lines[-1].get_color(), zorder=3)

y3 = np.linspace(ylim[0], ylim[1], 5001)
x3 = [tanh(yy) for yy in y3]
plt.plot(x3, y3, label='artanh', zorder=1)

plt.legend(loc='upper left').get_frame().set_alpha(0.9)
    
plt.savefig(name)
mplwp.postprocess(name)