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

# # Parameter `alpha_stroke` in `geom_label()`
# 
# 
# 
# Use the `alpha_stroke` parameter to enable the applying of `alpha` to `color` (label text and border).

# In[1]:


import numpy as np

from lets_plot import *


# In[2]:


LetsPlot.setup_html()


# In[3]:


x = np.arange(1, 10)
y = x[::-1]
data = {'x': x, 'y': y, 'alpha': x}


# In[4]:


p = ggplot(data, aes(x='x', y='y', alpha='y')) + \
    geom_bar(stat='identity', fill='#2b8cbe', tooltips='none') + \
    guides(alpha='none')


# In[5]:


p + geom_label(aes(label='y'), nudge_y=1, label_format='.1f', fill='#2b8cbe')


# #### Use `alpha_stroke` Parameter to Apply `alpha` to `color`

# In[6]:


p + geom_label(aes(label='y'), nudge_y=1, label_format='.1f', fill='#2b8cbe', alpha_stroke=True)