Example #1
1
    public void applyForce() {
      // force is proportional to the diff between restLen and current idst

      // a vector from A --> B
      Vector diff = new Vector(endA.pos, endB.pos);

      // compute the current distance
      float dist = diff.getMagnitude();
      // compute dx, which is what the force depends on
      float dx = Math.abs(dist - restLen);

      // a vector containing just the direction component of A --> B
      Vector dir = diff.copy().normalize();

      Vector force = dir.copy().scale(-K * dx, -K * dx);

      if (restLen < getDistance()) {
        // forces go INWARDS

        endB.addForce(force);
        endA.addForce(force.reverse());
      } else {
        // forces go OUTWARDS

        endA.addForce(force);
        endB.addForce(force.reverse());
      }
    }
Example #2
0
 public float getKineticEnergy() {
   float speed = vel.getMagnitude();
   float ke = 0.5f * mass * speed * speed;
   return ke; // 0.5 m * (v^2)
 }