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

# # Param `geodesic` in `geom_segment()` and `geom_path()`
# 
# With `geodesic=True` a segment will be transformed to a curve representing the shortest path between two points on the surface of Earth.
# 
# Note that this parameter only works when functions `geom_path()` and `geom_segment()` are used in combination with `geom_livemap()`.

# In[1]:


import pandas as pd

from lets_plot import *


# In[2]:


LetsPlot.setup_html()


# In[3]:


LetsPlot.set(maptiles_lets_plot(theme='dark'))


# #### By Default, a Segment on Map is a Straight Line
# 

# In[4]:


ggplot() + geom_livemap() + \
    geom_segment(x=-122.25165, y=37.464958, xend=139.4130, yend=35.4122, color='white', size=1)


# #### Segment with `geodesic=True`

# With `geodesic=True` a segment on map becomes an arc. 

# In[5]:


ggplot() + geom_livemap() + \
    geom_segment(x=-122.25165, y=37.464958, xend=139.4130, yend=35.4122, geodesic=True, color='white', size=1)


# #### `geom_path()` with `geodesic=True`
# 

# In[6]:


data = {
    'city': ['New York', 'San-Francisco', 'Tokyo'],
    'lon': [-73.935242, -122.25165, 139.4130],
    'lat': [40.730610, 37.464958, 35.4122],
}
ggplot(data) + \
    geom_livemap() + \
    geom_path(aes(x='lon', y='lat'), color='white', size=1, linetype="dotted") + \
    geom_path(aes(x='lon', y='lat'), geodesic=True, color='white', size=1)