package jsci.physics;

import jsci.maths.vectors.AbstractDoubleVector;
import jsci.maths.vectors.DoubleVector;

public class Spring {
        private final double coefficient;
        private AbstractDoubleVector x;

        /**
        * Constructs a mechanical spring.
        * @param coeff the spring constant.
        */
        public Spring(double coeff) {
                coefficient = coeff;
        }
        public void setPosition(AbstractDoubleVector pos) {
                x = pos;
        }
        public AbstractDoubleVector getPosition() {
                return x;
        }
        /**
        * Returns the potential energy of a particle attached to this spring.
        */
        public double energy(AbstractClassicalParticle p) {
                double rr = 0.0;
                AbstractDoubleVector ppos = p.getPosition();
                for(int i=0; i