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

# In[1]:


from lets_plot import *

LetsPlot.setup_html()


# In[2]:


import pandas as pd

mpg = pd.read_csv ("https://raw.githubusercontent.com/JetBrains/lets-plot-docs/master/data/mpg.csv")
mpg.head(3)


# #### Default Presentation

# In[3]:


p = ggplot(mpg, aes(x="displ", y="hwy")) + geom_point(aes(color="cty", shape="drv"), size=5)
p


# #### Multiline Legend

# In[4]:


scale_labels = scale_color_continuous(
                    name="City mileage",
                    breaks=[30,20,10],
                    labels=["30 (mpg)","2\n0\n(mpg)","10\n(mpg)"]
               ) + \
               scale_shape(
                    name="Drive type",
                    limits=["f", "r", "4"],
                    labels=["Front-wheel\ndrive", "Rear \n wheel \n drive", "4 wheel drive"])
p + scale_labels 


# #### Change Legend Direction

# In[5]:


p + scale_labels + theme(legend_position="bottom")


# #### No Overlapping

# In[6]:


p + scale_color_continuous(
        breaks=[35,30,25,20,15,10],
        labels=["35\n(mpg)","30\n(mpg)","25\n(mpg)","20\n(mpg)","15\n(mpg)","10\n(mpg)"])


# In[7]:


p + scale_color_continuous(
        breaks=[35,30,25,20,15,10],
        labels=["35\n(mpg)","30\n(mpg)","25\n(mpg)","20\n(mpg)","15\n(mpg)","10\n(mpg)"]
) + theme(legend_position="bottom")


# In[8]:


import numpy as np
from scipy.stats import multivariate_normal

delta = 0.5
center_x = - 100
center_y = 35
x = np.arange(-5.0, 5.0, delta)
y = np.arange(-5.0, 5.0, delta)
X, Y = np.meshgrid(x, y)

mu = np.array([1, 0])
sigma = np.diag([1, 4])
mu1 = np.array([0, 0])
sigma1 = np.diag([4, 1])

Z = multivariate_normal.pdf(np.dstack((X, Y)), mean=mu, cov=sigma)
Z = Z - multivariate_normal.pdf(np.dstack((X, Y)), mean=mu1, cov=sigma1)

x = X.reshape(-1) + center_x
y = Y.reshape(-1) + center_y
z = Z.reshape(-1)
dat = dict(x=x, y=y, z=z)

ggplot(dat, aes('x', 'y')) +  geom_tile(aes(fill='z'), width=.5, height=.5) +\
    geom_contour(aes(z='z'), alpha=0.5) +\
    scale_fill_gradient('blue', 'red') + \
    theme(legend_position='top')