class Displacement{
  float x,y;
  PVector v;
  float length;

  Displacement (float x, float y, PVector v){
    this.x = x;
    this.y = y;
    this.v = v; 
  }

  Displacement (float x, float y, float x2, float y2){
    this.x = x;
    this.y = y;
    this.v = new PVector(x2-x,y2-y); 
  }


}