Half the Sprite Collision?

[Milena]

Just wondering if there's a way to do a half sprite collision? For example, if I go towards colliding with an event, I only want to collide half with the sprite's measurement, how can I do a alert / console.log to tell me if it collides? What I am aiming for is to check whether half the sprite collision is made or full sprite collision is made. Is this possible with the current standpoint of MV and JavaScript?