coa4u/src/ActionsInterval/ActionSkewBy.cs

using System;
using System.Collections.Generic;
using UnityEngine;

class ActionSkewBy : ActionInterval
{
    protected Vector3 skewAngles1;
    protected Vector3 skewAngles2;
    protected Mesh mesh;

    public ActionSkewBy(Vector3 tgtAngles1, Vector3 tgtAngles2, float tgtDuration)
        : base(tgtDuration)
    {
        skewAngles1 = tgtAngles1;
        skewAngles2 = tgtAngles2;
    }

    public override Action clone()
    {
        return new ActionSkewBy(skewAngles1, skewAngles2, duration);
    }

    public override Action reverse()
    {
        return new ActionSkewBy(-skewAngles1, -skewAngles2, duration);
    }

    public override void start()
    {
        base.start();
        if (!(target is MeshActor))
        {
            throw new Exception("You should use MeshActor class instead of Actor, if you want to skew your object.");
        }
    }

    public override void stepInterval(float dt)
    {
        float d = dt / duration;
        Vector3 tgt = skewAngles1 * d;
        ((MeshActor)target).skewAngles1 += tgt;
        tgt = skewAngles2 * d;
        ((MeshActor)target).skewAngles2 += tgt;
    }
}