স্প্রিং বল

var anchor = new PVector(100, 10);
var bob = new PVector(110, 100);
var restLength = 20;

var k = 0.1;

var dir = PVector.sub(bob, anchor);
var currentLength = dir.mag();
var x = currentLength - restLength;

var k = 0.01;
var force = PVector.sub(bob, anchor);
var currentLength = force.mag();
var x = currentLength - restLength;
// Direction of spring force, a unit vector
force.normalize();
// Putting it together: direction and magnitude!
force.mult(-1 * k * x);

var bob = new Bob();

draw = function()  {
  // Our “make-up-a-gravity force”
  var gravity = new PVector(0, 1);
  bob.applyForce(gravity);
  // We need to also calculate and apply a spring force!
  var spring = ????
  bob.applyForce(spring);

  // Our standard update() and display() methods
  bob.update();
  bob.display();
};

var bob = new Bob();
var spring = new Spring();

draw = function()  {
  // Our “make-up-a-gravity force”
  var gravity = new PVector(0, 1);
  bob.applyForce(gravity);
  // Spring.connect() will take care of 
  // computing and applying the spring force
  spring.connect(bob);

  // Our standard update() and display() methods
  bob.update();
  bob.display();
};

var force = attractor.calculateAttraction(mover);
mover.applyForce(force);

var force = spring.calculateForce(bob);
bob.applyForce(force);

spring.connect(bob);

Spring.prototype.connect(bob) {
  var force = /* কিছু মজার হিসাব */;
  bob.applyForce(force);
};