Add assets

Assets/Cainos/Pixel Art Platformer - Village Props/Script/BoundingPlatform.cs

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+using System.Collections.Generic;
+using UnityEngine;
+using Cainos.Common;
+
+namespace Cainos.PixelArtPlatformer_VillageProps
+{
+    public class BoundingPlatform : MonoBehaviour
+    {
+        public Transform platform;
+
+        public float waitTime = 1.0f;
+        public float retrieveSpeed = 1.0f;
+        public float pushSpeed = 10.0f;
+
+        private float platformYPosDown;
+        private float platformYPosUp;
+        private float platformYPos;
+        private float waitTimer;
+        private State curState = State.Down;
+
+        private Vector3 platformPrevPos;
+        private Vector2 platformVel;
+
+        private SecondOrderDynamics secondOrderDynamics = new SecondOrderDynamics(4.0f, 0.5f, -0.3f);
+
+        private List<Rigidbody2D> onPlatformRigidbodies;
+
+        private void Push()
+        {
+            foreach ( Rigidbody2D rb2d in onPlatformRigidbodies)
+            {
+                rb2d.linearVelocity += pushSpeed * Vector2.up;
+            }
+            onPlatformRigidbodies.Clear();
+        }
+
+        private void Start()
+        {
+            platformYPosDown = platform.transform.localPosition.y;
+            platformYPosUp = 0.0f;
+            onPlatformRigidbodies = new List<Rigidbody2D>();
+
+            platformPrevPos = platform.transform.position;
+
+            secondOrderDynamics.Reset(platformYPosDown);
+        }
+
+        private void FixedUpdate()
+        {
+            platformVel = (platform.transform.position - platformPrevPos) / Time.fixedDeltaTime;
+            platformPrevPos = platform.transform.position;
+
+            waitTimer += Time.fixedDeltaTime;
+            if ( waitTimer > waitTime )
+            {
+                //to up
+                if (curState == State.Down)
+                {
+                    waitTimer = 0.0f;
+                    curState = State.Up;
+                    platformYPos = platformYPosUp;
+
+                    Push();
+                }
+                //to down
+                else
+                {
+                    if (platformYPos > platformYPosDown)
+                    {
+                        platformYPos -= retrieveSpeed * Time.fixedDeltaTime;
+                    }
+                    else
+                    {
+                        waitTimer = 0.0f;
+                        platformYPos = platformYPosDown;
+                        curState = State.Down;
+                    }
+                }
+            }
+
+            platform.transform.localPosition = Vector3.up * secondOrderDynamics.Update(platformYPos, Time.fixedDeltaTime);
+        }
+
+        private void OnTriggerEnter2D(Collider2D collision)
+        {
+            if (collision.attachedRigidbody && collision.attachedRigidbody.bodyType == RigidbodyType2D.Dynamic)
+            {
+                if (onPlatformRigidbodies.Contains(collision.attachedRigidbody)) return;
+
+                onPlatformRigidbodies.Add(collision.attachedRigidbody);
+            }
+        }
+
+        private void OnTriggerExit2D(Collider2D collision)
+        {
+            if (collision.attachedRigidbody && collision.attachedRigidbody.bodyType == RigidbodyType2D.Dynamic)
+            {
+                if (onPlatformRigidbodies.Contains(collision.attachedRigidbody) == false) return;
+                onPlatformRigidbodies.Remove(collision.attachedRigidbody);
+            }
+        }
+
+        public enum State
+        {
+            Up,
+            Down
+        }
+    }
+}