From e5d082b220eaa4351086b27607231f5df01a0903 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Thu, 17 Feb 2022 19:42:30 +0800
Subject: *misc

---
 .../InterpolationFactorController.cs               | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 JamHelper/Assets/JamTools/Scripts/Smooth-Motion-in-Unity/InterpolationFactorController.cs

(limited to 'JamHelper/Assets/JamTools/Scripts/Smooth-Motion-in-Unity/InterpolationFactorController.cs')

diff --git a/JamHelper/Assets/JamTools/Scripts/Smooth-Motion-in-Unity/InterpolationFactorController.cs b/JamHelper/Assets/JamTools/Scripts/Smooth-Motion-in-Unity/InterpolationFactorController.cs
new file mode 100644
index 0000000..efb96f3
--- /dev/null
+++ b/JamHelper/Assets/JamTools/Scripts/Smooth-Motion-in-Unity/InterpolationFactorController.cs
@@ -0,0 +1,58 @@
+using UnityEngine;
+
+[DisallowMultipleComponent]
+[DefaultExecutionOrder(ORDER_EXECUTION)]
+public class InterpolationFactorController : MonoBehaviour
+{
+    public const int ORDER_EXECUTION = -1000;
+
+    private static InterpolationFactorController Instance;
+    private float[] _lastFixedUpdates = new float[2];
+    private int _lastIndex;
+
+    public static float Factor { get; private set; }
+
+    private void Awake()
+    {
+        if (Instance)
+        {
+            Destroy(this);
+            Debug.LogWarning($"The '{typeof(InterpolationFactorController).Name}' is a singleton!");
+            return;
+        }
+
+        Instance = this;
+        Factor = 1;
+    }
+
+    private void Start()
+    {
+        _lastFixedUpdates = new float[2] { Time.fixedTime, Time.fixedTime };
+        _lastIndex = 0;
+    }
+
+    private void FixedUpdate()
+    {
+        _lastIndex = NextIndex();
+        _lastFixedUpdates[_lastIndex] = Time.fixedTime;
+    }
+
+    private void Update()
+    {
+        float lastTime = _lastFixedUpdates[_lastIndex];
+        float prevTime = _lastFixedUpdates[NextIndex()];
+
+        if (lastTime == prevTime)
+        {
+            Factor = 1;
+            return;
+        }
+
+        Factor = (Time.time - lastTime) / (lastTime - prevTime);
+    }
+
+    private int NextIndex()
+    {
+        return (_lastIndex == 0) ? 1 : 0;
+    }
+}
-- 
cgit v1.1-26-g67d0