import numpy as np
import matplotlib.pyplot as plt

height = 3
radius = 2
base_radius = 0.5
base_length = 0.3

def morph_shape(x, L, H, morph_type="linear"):
    
    y = np.ones(x.shape[0])
    if morph_type == "linear":
        y = (x/L)*H
    elif morph_type == "logistic":
        k = 10.0
        v = 1.0
        y = H/(1.0 + np.power(np.exp(-k*(x-L/4.0)), v))
    elif morph_type == "sinusoid":
        y = np.sin((x/L)*np.pi/2.0)
    elif morph_type == "hyperbolic_tan":
        y = np.tanh((x/L)*np.pi/2.0)
    elif morph_type == "circle":
        y = np.tanh((x/L)*np.pi/2.0)          
    
    return y

x_base = np.linspace(0, base_length, 10)
y_base = base_radius*np.ones(x_base.shape[0])

x_lamp = np.linspace(base_length, height, 100)
y_lamp = base_radius + morph_shape(x_lamp-base_length,
                                   height-base_length,
                                   radius-base_radius,
                                   "hyperbolic_tan")
x = np.append(x_base, x_lamp)
y = np.append(y_base, y_lamp)
plt.plot(x, y)

axes = plt.gca()
axes.set_xlim([0, 1.1*base_length+height])
axes.set_ylim([0,1.1*radius])
plt.axis('equal')
plt.show()