gistfile1.cs

class TestCollider : Component, IUpdatable
    {
        public float Distance;

        public override void onAddedToEntity()
        {
            entity.addCollider<BoxCollider>(new BoxCollider(100,100));
        }

        public void update()
        {

            var bottomLeft = new Vector2(entity.colliders.First().bounds.left, entity.colliders.First().bounds.bottom);;

            RaycastHit bottomHit = Physics.linecast(bottomLeft, bottomLeft + (Vector2.UnitY * 100));
            Debug.drawLine(bottomLeft, bottomLeft + (Vector2.UnitY * 100), Color.Red);

            if (bottomHit.collider != null)
                Distance = bottomHit.distance;

            var position = Input.mousePosition;
            if (Input.leftMouseButtonDown)
                transform.position = position;
        }

    }
        
        
        // in the scene file
        
        public override void onStart()
        {
            createEntity("tracker").addComponent<TestCollider>(new TestCollider());
            createEntity("circle", new Vector2(800, 200)).addCollider<CircleCollider>(new CircleCollider(50));
            createEntity("box", new Vector2(500, 300)).addCollider<BoxCollider>(new BoxCollider(50,50));
            createEntity("polygon", new Vector2(600, 300)).addCollider<PolygonCollider>(new PolygonCollider(new Vector2[] { new Vector2(0,50), new Vector2(100, 0), new Vector2(100, 100), new Vector2(0, 100)}));
        }