Implemented a simple demo with plotly

[ppeerttu]

Details

Implemented a simple demo with Plotly and the crime data.

EDIT: Moved the logic in to a class and removed the demo file as we're probably not needing demos in the repository (demos can be done ad-hoc anyways).

Steps to try it out

1. Install dependencies from requirements.txt
2. Extract the crime data into ~../data~ datasets directory (~outside of~ inside the repository)
   • Or just change the directory path directly from the file

3. Place the following code in the root directory e.g. demo.py:

   from app.file.utils import read_csv_directory
   from app.map.heat_map import HeatMap
   
   COLUMNS = [HeatMap.LAT, HeatMap.LON]
   DATA_DIRECTORY = './datasets/data.police.uk/2016-11'
   
   crimes = read_csv_directory(
       DATA_DIRECTORY,
       COLUMNS,
       30 # Limit of files to read
   )
   heat_map = HeatMap(crimes)
   heat_map.show()

Limitations

• The utility function can currently parse csv files from only one directory
• The plotly library can't handle huge amount of data points (at least on my computer)
  • Was able to plot at least 130k data points
  • We have to narrow down the data (at least) based on time and place

[ppeerttu]

Btw, in case we want (or need) to implement unit tests, we can use the new Github Actions service for automated testing.

[Kivike]

Btw, in case we want (or need) to implement unit tests, we can use the new Github Actions service for automated testing.

I don't think we really need them at all. I just wanted to check how they are done for python for learning purposes. But good to know in any case!