#!/usr/bin/env python
# coding: utf-8

# In[ ]:


from bqplot import pyplot as plt
import ipywidgets as widgets
import numpy as np


# In[ ]:


# generate some fake
n = 2000
x = np.linspace(0.0, 10.0, n)
np.random.seed(0)
y = np.cumsum(np.random.randn(n) * 10).astype(int)


# In[ ]:


fig_hist = plt.figure(title="Histogram")
hist = plt.hist(y, bins=25)


# In[ ]:


hist.bins = 10;


# In[ ]:


slider = widgets.IntSlider(description="Bins number", min=1, max=100, v_model=30)


# In[ ]:


widgets.link((hist, "bins"), (slider, "value"))

fig_lines = plt.figure(title="Line Chart")
lines = plt.plot(x, y)

fig_lines.layout.width = "auto"
fig_lines.layout.height = "auto"
fig_hist.layout.width = "auto"
fig_hist.layout.height = "auto"

grid_layout = widgets.GridspecLayout(5, 3)

grid_layout[:2, :] = fig_lines
grid_layout[2:4, :] = fig_hist
grid_layout[4, 1] = slider

grid_layout.layout.height = "1000px"

grid_layout


# In[ ]:


selector = plt.brush_int_selector()


def update_range(*ignore):
    if selector.selected is not None and len(selector.selected) == 2:
        xmin, xmax = selector.selected
        mask = (x > xmin) & (x < xmax)
        hist.sample = y[mask]


selector.observe(update_range, "selected")


# In[ ]: