class Ground {
    float x1, y1, x2, y2;  
    float x, y, len, rot;
  
    // Default constructor
    Ground(){
    }
  
    // Constructor
    Ground(float x1, float y1, float x2, float y2) {
      this.x1 = x1;
      this.y1 = y1;
      this.x2 = x2;
      this.y2 = y2;
      x = (x1+x2)/2;
      y = (y1+y2)/2;
      len = dist(x1, y1, x2, y2);
      rot = atan2((y2-y1), (x2-x1));
    }
  }