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Assets/Packages/com.unity.uiextensions/Runtime/Scripts/Effects/CurlyUI/CUIBezierCurve.cs

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+/// Credit Titinious (https://github.com/Titinious)
+/// Sourced from - https://github.com/Titinious/CurlyUI
+
+namespace UnityEngine.UI.Extensions
+{
+    /// <summary>
+    /// Assume to be a cubic bezier curve at the moment.
+    /// </summary>
+    public class CUIBezierCurve : MonoBehaviour
+    {
+        public readonly static int CubicBezierCurvePtNum = 4;
+
+        #region Descriptions
+
+        [SerializeField]
+        protected Vector3[] controlPoints;
+
+        public Vector3[] ControlPoints
+        {
+            get
+            {
+                return controlPoints;
+            }
+
+        }
+
+#if UNITY_EDITOR
+        /// <summary>
+        /// Reserve for editor only
+        /// </summary>
+        public Vector3[] EDITOR_ControlPoints
+        {
+            set
+            {
+                controlPoints = value;
+            }
+        }
+#endif
+
+        #endregion
+
+        #region Events
+
+#if UNITY_EDITOR
+        protected void OnValidate()
+        {
+            Refresh();
+        }
+#endif
+
+        public void Refresh()
+        {
+
+            if (OnRefresh != null)
+                OnRefresh();
+        }
+
+        #endregion
+        #region Services
+
+        /// <summary>
+        /// call this to get a sample
+        /// </summary>
+        /// <param name="_time"></param>
+        /// <returns>sample returned by said time</returns>
+        public Vector3 GetPoint(float _time)
+        {
+            float oneMinusTime = 1 - _time;
+
+            return oneMinusTime * oneMinusTime * oneMinusTime * controlPoints[0] +
+                3 * oneMinusTime * oneMinusTime * _time * controlPoints[1] +
+                3 * oneMinusTime * _time * _time * controlPoints[2] +
+                _time * _time * _time * controlPoints[3];
+        }
+
+        public Vector3 GetTangent(float _time)
+        {
+            float oneMinusTime = 1 - _time;
+
+            return 3 * oneMinusTime * oneMinusTime * (controlPoints[1] - controlPoints[0]) +
+                6 * oneMinusTime * _time * (controlPoints[2] - controlPoints[1]) +
+                3 * _time * _time * (controlPoints[3] - controlPoints[2]);
+        }
+
+        #endregion
+
+        #region Configurations
+
+        public void ReportSet()
+        {
+            if (controlPoints == null)
+            {
+                controlPoints = new Vector3[CUIBezierCurve.CubicBezierCurvePtNum];
+                controlPoints[0] = new Vector3(0, 0, 0);
+                controlPoints[1] = new Vector3(0, 1, 0);
+                controlPoints[2] = new Vector3(1, 1, 0);
+                controlPoints[3] = new Vector3(1, 0, 0);
+            }
+
+            bool isPointsReady = true;
+
+            isPointsReady = isPointsReady & controlPoints.Length == CUIBezierCurve.CubicBezierCurvePtNum;
+        }
+        #endregion
+
+
+        #region Services
+
+        public System.Action OnRefresh;
+
+
+
+        #endregion
+
+    }
+}