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%matplotlib notebook
    
from matplotlib.collections import LineCollection
import matplotlib.pyplot as plt
from scipy import interpolate
import numpy as np
from numpy.random import rand

from ipywidgets import FloatSlider, interactive, IntSlider


    

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def simple_example(amplitude=2.0, phase=0.0):
    plt.rcParams['figure.figsize'] = 8,6
    plt.figure()
    x = np.linspace(-2*np.pi, 2*np.pi, 1000)
    y = amplitude * np.sin(x + phase)
    plt.plot(x, y)
    plt.xlim(-3, 3)
    plt.ylim(-2*np.pi, 2*np.pi)
    plt.show()
    return


    

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amplitude_slider = FloatSlider(value=2.0, min=0, max=6.0, step=.1)
phase_slider = FloatSlider(value=0.0, min=-np.pi, max=np.pi, step=.10)

interactive(simple_example,
            amplitude=amplitude_slider,
            phase=phase_slider
           )


    

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def spline_demo(num=14, smooth=0, seed=10, brush_strokes=30, alpha=0.5):
    a = np.random.RandomState(seed=seed)
    x = a.rand(num)
    y = a.rand(num)
    t = np.arange(0, 1.1, .1)
    plt.rcParams['figure.figsize'] = 8, 8
    plt.figure()
    for brush_stroke in range(brush_strokes):
        tck, u = interpolate.splprep(
            [x + a.rand(num) / 10.0, y + a.rand(num) / 10.0], s=smooth)
        unew = np.arange(0, 1.01, 0.001)
        out = interpolate.splev(unew, tck)
        plt.plot(out[0], out[1], alpha=alpha, c='black', linewidth=3.0)
    plt.xlim(-1.5, 2.)
    plt.ylim(-1.5, 2.)
    plt.axis('off')
    plt.show()


smooth_slider = FloatSlider(value=0, min=0, max=20.0, step=.1)
num_points_slider = IntSlider(value=8, min=4, max=20)
seed_slider = IntSlider(value=4, min=4, max=20)
brush_slider = IntSlider(value=1, min=1, max=20)
alpha_slider = FloatSlider(value=.5, min=0, max=1.0, step=.05)

w = interactive(
    spline_demo,
    smooth=smooth_slider,
    num=num_points_slider,
    seed=seed_slider,
    brush_strokes=brush_slider,
    alpha=alpha_slider)
w


    

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