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Assets/Dreamteck/Splines/Components/Sample Modifiers/OffsetModifier.cs

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+namespace Dreamteck.Splines
+{
+    using System.Collections;
+    using System.Collections.Generic;
+    using UnityEngine;
+
+    [System.Serializable]
+    public class OffsetModifier : SplineSampleModifier
+    {
+        [System.Serializable]
+        public class OffsetKey : Key
+        {
+            public Vector2 offset = Vector2.zero;
+            public OffsetKey(Vector2 o, double f, double t, OffsetModifier modifier) : base(f, t, modifier)
+            {
+                offset = o;
+            }
+        }
+        public List<OffsetKey> keys = new List<OffsetKey>();
+
+        public OffsetModifier()
+        {
+            keys = new List<OffsetKey>();
+        }
+
+        public override List<Key> GetKeys()
+        {
+            List<Key> output = new List<Key>();
+            for (int i = 0; i < keys.Count; i++) output.Add(keys[i]);
+            return output;
+        }
+
+        public override void SetKeys(List<Key> input)
+        {
+            keys = new List<OffsetKey>();
+            for (int i = 0; i < input.Count; i++) keys.Add((OffsetKey)input[i]);
+            base.SetKeys(input);
+        }
+
+        public void AddKey(Vector2 offset, double f, double t)
+        {
+            keys.Add(new OffsetKey(offset, f, t, this));
+        }
+
+        public override void Apply(SplineSample result)
+        {
+            if (keys.Count == 0) return;
+            base.Apply(result);
+            Vector2 offset = Evaluate(result.percent);
+            result.position += result.right * offset.x + result.up * offset.y;
+        }
+
+        Vector2 Evaluate(double time)
+        {
+            if (keys.Count == 0) return Vector2.zero;
+            Vector2 offset = Vector2.zero;
+            for(int i = 0; i < keys.Count; i++) offset += keys[i].offset * keys[i].Evaluate(time);
+            return offset * blend;
+        }
+    }
+}