Net.Like.Xue.Tokyo/Assets/Plugins/Character Controller Pro/Utilities/Scripts/PhysicsExtensions.cs

using System.Collections.Generic;
using UnityEngine;

namespace Lightbug.Utilities
{
    public delegate bool HitFilterDelegate(Transform hitTransform);
    public delegate bool Hit2DFilterDelegate(ref RaycastHit2D hitInfo);
    public delegate bool Hit3DFilterDelegate(ref RaycastHit hitInfo);
    public delegate bool OverlapFilterDelegate2D(Collider2D collider);
    public delegate bool OverlapFilterDelegate3D(Collider collider);

    public static class PhysicsExtensions
    {
        public enum ClosestHitResult
        {
            NoHit,
            Hit,
            Overlap
        }
                
        public static ClosestHitResult GetFurthestHit(this RaycastHit[] array, out RaycastHit hitInfo, int length, Hit3DFilterDelegate filter)
        {
            float closestDistance = 0f;
            int index = -1;
            hitInfo = new RaycastHit();

            if (length == 0)
                return ClosestHitResult.NoHit;

            for (int i = 0; i < length; i++)
            {
                var h = array[i];

                if (filter != null)
                    if (!filter.Invoke(ref h))
                        continue;

                if (h.distance > closestDistance)
                {
                    closestDistance = h.distance;
                    index = i;
                }
            }

            bool hit = index != -1;
            if (hit)
            {
                hitInfo = array[index];
                return ClosestHitResult.Hit;
            }

            return ClosestHitResult.NoHit;
        }

        public static ClosestHitResult GetFurthestHit(this RaycastHit2D[] array, out RaycastHit2D hitInfo, int length, Hit2DFilterDelegate filter)
        {
            float closestDistance = 0f;
            int index = -1;
            hitInfo = new RaycastHit2D();

            if (length == 0)
                return ClosestHitResult.NoHit;

            for (int i = 0; i < length; i++)
            {
                var h = array[i];

                if (filter != null)
                    if (!filter.Invoke(ref h))
                        continue;

                if (h.distance > closestDistance)
                {
                    closestDistance = h.distance;
                    index = i;
                }
            }

            bool hit = index != -1;
            if (hit)
            {
                hitInfo = array[index];
                return ClosestHitResult.Hit;
            }

            return ClosestHitResult.NoHit;
        }

        public static ClosestHitResult GetClosestHit(this RaycastHit[] array, out RaycastHit hitInfo, int length, Hit3DFilterDelegate filter)
        {
            float closestDistance = Mathf.Infinity;
            int index = -1;
            hitInfo = new RaycastHit();

            if (length == 0)
                return ClosestHitResult.NoHit;

            for (int i = 0; i < length; i++)
            {
                var h = array[i];

                if (filter != null)
                    if (!filter.Invoke(ref h))
                        continue;

                if (h.distance < closestDistance)
                {
                    closestDistance = h.distance;
                    index = i;
                }
            }

            bool hit = index != -1;
            if (hit)
            {
                hitInfo = array[index];
                return ClosestHitResult.Hit;
            }

            return ClosestHitResult.NoHit;
        }

        public static ClosestHitResult GetClosestHit(this RaycastHit2D[] array, out RaycastHit2D hitInfo, int length, Hit2DFilterDelegate filter)
        {
            float closestDistance = Mathf.Infinity;
            int index = -1;
            hitInfo = new RaycastHit2D();

            if (length == 0)
                return ClosestHitResult.NoHit;

            for (int i = 0; i < length; i++)
            {
                var h = array[i];

                if (filter != null)
                    if (!filter.Invoke(ref h))
                        continue;

                if (h.distance < closestDistance)
                {
                    closestDistance = h.distance;
                    index = i;
                }
            }

            bool hit = index != -1;
            if (hit)
            {
                hitInfo = array[index];
                return ClosestHitResult.Hit;
            }

            return ClosestHitResult.NoHit;
        }
    }

}