text: #pragma once
  
  const double BALL_RADIUS = 5;
  const double BALL_DIAM   = 2 * BALL_RADIUS;
  
  const int NUMBER_OF_SPECIES = 5;
  const int STARTING_POPULATION = 400;
  
  const int MESSAGE_LIFESPAN = 5;
  const int FONT_SIZE = 20;
  
  namespace Display
  {
      constexpr uint16_t WIDTH  = 1800;
      constexpr uint16_t HEIGHT = 900;    
  }
  
  namespace Physics
  {
      const double OVERLAP_REPULSION_MULTIPLIER = 5;
  
      const double INTERACTION_FORCE_MULTIPLIER = 0.5;
   
      // 1 = one extra particle diameter of separation;
      const double MIN_RADIUS_MULTIPLIER = 1; // higher values make things more dynamic
      const double MAX_RADIUS_MULTIPLIER = 4; // higher values allow formation of bigger structures
  
      const double FRICTION = 0.975;
      const double EDGE_BOUNCE = 0.3;
  }