//Copyright: © 2016 DigiPen, All Rights Reserved.
//Author:    Zero Engine Team

class OrientTowardsVelocity2D : ZilchComponent
{
    // An offset for the object's rotation in degrees.
    [Property]
    var DegreeOffset : Real = 0.0;
    
    // The orientation component is used to align the object's forward with it's velocity.
    [Dependency]
    var Orientation : Orientation = null;
    
    function Initialize(init : CogInitializer)
    {
        Zero.Connect(this.Space, Events.LogicUpdate, this.OnLogicUpdate);
    }
    
    function OnLogicUpdate(updateEvent : UpdateEvent)
    {
        var vel = this.Owner.RigidBody.Velocity;
        
        // If we don't do this check and for some reason get a zero velocity
        // vector then our object will snap to 0 degrees. This would cause a
        // non moving object with a rotation of 90 degrees to snap to 0 degrees all of a sudden.
        if(Math.Length(vel) < 0.0001)
        {
            return;
        }
        
        var up = Real3(0, 0, 1);
        this.Orientation.LookAtDirectionWithUp(vel, up);
    }
}