Simulation of virus spread

Simple simulation for the spread of a virus. 

Mechanics:

• White dots are "susceptible" and yellow dots are "infected" people.

• People move around the area randomly in a fixed area, and it is always in a scene of 20 people, with one extra person infected.
• The susceptible within the range of an infected person has a certain probability of getting infected (equated to be the average mask effectiveness of most masks used by the public) the longer they are in each other's range. 
• They have a chance of getting detected and removed when infected due to persistent checks (random probability for now), or they are all removed in 2 weeks time (found to be the average time when symptoms appear) - which is 20 seconds in the simulation. 
• Movement restrictions depend on the situation (Eg Circuit Breaker, Heightened phase 2)
• Spawn new units (ranging from 1-20 units) with the slider and clicking the button
• The recovery button enables and disables recovery of people within the scene.
• Select the "End by timer?" button to end each simulation when everyone is infected. Select it again to end simulation at a fixed time (43 seconds in real life time, according to the scaled time (2 weeks) when a person recovers from an infection and becomes removed)

Keybinds:

BACKSPACE - Remove settings/ UI or reappear again

P - Pause/ Play

R - Restart

Simulation source code: 

https://github.com/iptcyq/Virus-Spread-Simulation

Current state (build 3.1): Set to end each simulation at the end of 43 seconds by default, unless "End by time?" button is activated.