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

# # Area Plots

# In[2]:


from altair import *


# In[3]:


data = load_dataset('unemployment-across-industries')
data['date'] = data['date'].astype(str)


# ## Simple Area Chart

# In[4]:


Layer(data).mark_area().encode(
    X('date:T', axis=Axis(format='%Y', labelAngle=0)),
    y='sum(count)'
)


# ## Stacked Area Chart

# In[5]:


Layer(data).mark_area().encode(
    X('date:T',
      timeUnit='yearmonth',
      axis=Axis(format='%Y', labelAngle=0, title='year')),
    Y('sum(count)'),
    Color('series:N', scale=Scale(range="category20b"))
)


# ## Normalized Area Chart

# In[6]:


Layer(data).mark_area(stacked='normalize').encode(
    X('date:T', timeUnit='yearmonth',
      axis=Axis(format='%Y', labelAngle=0, title='year')),
    Y('sum(count)'),
    color=Color('series:N', scale=Scale(range="category20b"))
)


# ## SteamGraph

# In[7]:


Layer(data).mark_area(stacked='center').encode(
    X('date:T', timeUnit='yearmonth',
      axis=Axis(format='%Y', labelAngle=0, title='year')),
    Y('sum(count)'),
    color=Color('series:N', scale=Scale(range="category20b"))
)