coa4u/src/ActionsInterval/ActionTintTo.cs

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

class ActionTintTo : ActionInterval
{
    protected Vector4 color;
    protected Vector4 path;
    protected const float coeff = 1F / 255F;

    public ActionTintTo(Vector4 tgtColor, float tgtDuration)
        : base(tgtDuration)
    {
        color = tgtColor * coeff;
        path = Vector4.zero;
    }

    public ActionTintTo(Vector3 tgtColor, float tgtDuration)
        : this(new Vector4(tgtColor.x, tgtColor.y, tgtColor.z), tgtDuration)
    {
    }

    public override Action clone()
    {
        return new ActionTintTo(color / coeff, duration);
    }

    public override void start()
    {
        base.start();
        Color tgtColor = renderer.material.color;
        path[0] = color[0] - tgtColor[0];
        path[1] = color[1] - tgtColor[1];
        path[2] = color[2] - tgtColor[2];
        path[3] = color[3] - tgtColor[3];
    }

    public override void stepInterval(float dt)
    {
        float d = dt / duration;
        Vector4 tgt = path * d;
        Color tgtColor = renderer.material.color;
        tgtColor[0] += tgt[0];
        tgtColor[1] += tgt[1];
        tgtColor[2] += tgt[2];
        tgtColor[3] += tgt[3];
        renderer.material.color = tgtColor;
    }
}