// Collisions -- Elastic, Equal Mass, Two objects only
// Nature of Code, Spring 2009
// Daniel Shiffman <http://www.shiffman.net>

// Based off of Chapter 9: Resolving Collisions
// Mathematics and Physics for Programmers by Danny Kodicek

// A Thing class for idealized collisions

Thing a;
Thing b;

boolean showVectors = true;

void setup() {
  size(200,200);
  smooth();
  a = new Thing(new PVector(random(5),random(-5,5)),new PVector(10,10));
  b = new Thing(new PVector(-2,1),new PVector(150,150));
}

void draw() {  
  background(255);
  a.go();
  b.go();  
  
  // Note this function will ONLY WORK with two objects
  // Needs to be revised in the case of an array of objects  
  a.collideEqualMass(b);
}