bepin/Plugins/SliderUnlocker/SliderMath.cs

using System.Collections.Generic;
using UnityEngine;
using static AnimationKeyInfo;

namespace SliderUnlocker
{
    public static class SliderMath
    {
        public static Vector3 CalculateScale(List<AnmKeyInfo> list, float rate)
        {
            Vector3 min = list[0].scl;
            Vector3 max = list[list.Count - 1].scl;

            return min + (max - min) * rate;
        }

        public static Vector3 CalculatePosition(List<AnmKeyInfo> list, float rate)
        {
            Vector3 min = list[0].pos;
            Vector3 max = list[list.Count - 1].pos;

            return min + (max - min) * rate;
        }

        public static Vector3 CalculateRotation(List<AnmKeyInfo> list, float rate)
        {
            Vector3 rot1 = list[0].rot;
            Vector3 rot2 = list[1].rot;
            Vector3 rot3 = list[list.Count - 1].rot;

            Vector3 vector = rot2 - rot1;
            Vector3 vector2 = rot3 - rot1;

            bool xFlag = vector.x >= 0f;
            bool yFlag = vector.y >= 0f;
            bool zFlag = vector.z >= 0f;

            if (vector2.x > 0f && !xFlag)
            {
                vector2.x -= 360f;
            }
            else if (vector2.x < 0f && xFlag)
            {
                vector2.x += 360f;
            }

            if (vector2.y > 0f && !yFlag)
            {
                vector2.y -= 360f;
            }
            else if (vector2.y < 0f && yFlag)
            {
                vector2.y += 360f;
            }

            if (vector2.z > 0f && !zFlag)
            {
                vector2.z -= 360f;
            }
            else if (vector2.z < 0f && zFlag)
            {
                vector2.z += 360f;
            }


            if (rate < 0f)
            {
                return rot1 - vector2 * Mathf.Abs(rate);
            }

            return rot3 + vector2 * Mathf.Abs(rate - 1f);
        }
    }
}