1 files changed, 117 insertions, 0 deletions
diff --git a/JamHelper/Assets/Scripts/Smooth-Motion-in-Unity/InterpolationObjectController.cs b/JamHelper/Assets/Scripts/Smooth-Motion-in-Unity/InterpolationObjectController.cs
new file mode 100644
index 0000000..9a83fe0
--- /dev/null
+++ b/JamHelper/Assets/Scripts/Smooth-Motion-in-Unity/InterpolationObjectController.cs
@@ -0,0 +1,117 @@
+using System.Collections;
+using UnityEngine;
+
+[DisallowMultipleComponent]
+[DefaultExecutionOrder(ORDER_EXECUTION)]
+public class InterpolationObjectController : MonoBehaviour
+{
+    public const int ORDER_EXECUTION = InterpolationFactorController.ORDER_EXECUTION - 1;
+
+    private TransformData[] _transforms;
+    private int _index;
+
+    private void Awake()
+    {
+        StartCoroutine(WaitForEndOfFrame());
+        StartCoroutine(WaitForFixedUpdate());
+    }
+
+    private void OnEnable()
+    {
+        ResetTransforms();
+    }
+
+    private void BeforeFixedUpdate()
+    {
+        // Restoring actual transform for the FixedUpdate() cal where it could be change by the user.
+        RestoreActualTransform();
+    }
+
+    private void AfterFixedUpdate()
+    {
+        // Saving actual transform for being restored in the BeforeFixedUpdate() method.
+        SaveActualTransform();
+    }
+
+    private void Update()
+    {
+        // Set interpolated transform for being rendered.
+        SetInterpolatedTransform();
+    }
+
+    #region Helpers
+
+    private void RestoreActualTransform()
+    {
+        var latest = _transforms[_index];
+        transform.localPosition = latest.position;
+        transform.localScale = latest.scale;
+        transform.localRotation = latest.rotation;
+    }
+
+    private void SaveActualTransform()
+    {
+        _index = NextIndex();
+        _transforms[_index] = CurrentTransformData();
+    }
+
+    private void SetInterpolatedTransform()
+    {
+        var prev = _transforms[NextIndex()];
+        float factor = InterpolationFactorController.Factor;
+        transform.localPosition = Vector3.Lerp(prev.position, transform.localPosition, factor);
+        transform.localRotation = Quaternion.Slerp(prev.rotation, transform.localRotation, factor);
+        transform.localScale = Vector3.Lerp(prev.scale, transform.localScale, factor);
+    }
+
+    public void ResetTransforms()
+    {
+        _index = 0;
+        var td = CurrentTransformData();
+        _transforms = new TransformData[2] { td, td };
+    }
+
+    private TransformData CurrentTransformData()
+    {
+        return new TransformData(transform.localPosition, transform.localRotation, transform.localScale);
+    }
+
+    private int NextIndex()
+    {
+        return (_index == 0) ? 1 : 0;
+    }
+
+    private IEnumerator WaitForEndOfFrame()
+    {
+        while (true)
+        {
+            yield return new WaitForEndOfFrame();
+            BeforeFixedUpdate();
+        }
+    }
+
+    private IEnumerator WaitForFixedUpdate()
+    {
+        while (true)
+        {
+            yield return new WaitForFixedUpdate();
+            AfterFixedUpdate();
+        }
+    }
+
+    private struct TransformData
+    {
+        public Vector3 position;
+        public Quaternion rotation;
+        public Vector3 scale;
+
+        public TransformData(Vector3 position, Quaternion rotation, Vector3 scale)
+        {
+            this.position = position;
+            this.rotation = rotation;
+            this.scale = scale;
+        }
+    }
+
+    #endregion
+}