var Constraint2 = require('constraint2')
var c = new Constraint2();
var v = new Vec2(0, 0)
// lets make seg only move vertically
var fn = c.addConstraint(v, function(vec) {
return new Vec2(v.x, vec.y);
});
// attempt a move
c.position(v, 10, 10);
console.log(v.toString()); // (0, 10);
c.remove(fn);
c.position(v, 10, 10);
console.log(v.toString()); // (10, 10);MIT (see: license.txt)