mquaker · September 28, 2019 12:03 · Feb 14, 2018
diff --git a/CurvedLayout.cs b/CurvedLayout.cs
@@ -0,0 +1,102 @@
+/// <summary>
+/// Curved Layout Group Created by Freezy - http://www.ElicitIce.com
+/// Posted on Unity Forums http://forum.unity3d.com/threads/script-curved-layout.403985/
+///
+/// Free for any use and alteration, source code may not be sold without my permission.
+/// If you make improvements on this script please share them with the community.
+///
+/// </summary>
+
+namespace UnityEngine.UI.Extensions
+{
+    /// <summary>
+    /// TODO:
+    /// - add automatic child sizing, like in the HorizontalOrVerticalLayoutGroup.cs
+    /// - nicer anchor handling for initial child positions
+    /// </summary>
+    [AddComponentMenu( "Layout/Extensions/Curved Layout" )]
+    public class CurvedLayout : LayoutGroup
+    {
+        public Vector3 CurveOffset;
+
+        // Yes these two could be combined into a single vector
+        // but this makes it easier to use?
+        [Tooltip( "axis along which to place the items, Normalized before use" )]
+        public Vector3 itemAxis;
+        [Tooltip( "size of each item along the Normalized axis" )]
+        public float itemSize;
+
+        // the slope can be moved by altering this setting, it could be constrained to the 0-1 range, but other values are usefull for animations
+        public float centerpoint = 0.5f;
+
+        protected override void OnEnable() { base.OnEnable(); CalculateRadial(); }
+        public override void SetLayoutHorizontal()
+        {
+        }
+        public override void SetLayoutVertical()
+        {
+        }
+        public override void CalculateLayoutInputVertical()
+        {
+            CalculateRadial();
+        }
+        public override void CalculateLayoutInputHorizontal()
+        {
+            CalculateRadial();
+        }
+#if UNITY_EDITOR
+        protected override void OnValidate()
+        {
+            base.OnValidate();
+            CalculateRadial();
+        }
+#endif
+
+        void CalculateRadial()
+        {
+            m_Tracker.Clear();
+            if ( transform.childCount == 0 )
+                return;
+
+            //one liner for figuring out the pivot (why not a utility function switch statement?)
+            Vector2 pivot = new Vector2( ( ( int )childAlignment % 3 ) * 0.5f, ( ( int )childAlignment / 3 ) * 0.5f );
+
+            //this seems to work ok-ish
+            Vector3 lastPos = new Vector3(
+                GetStartOffset( 0, GetTotalPreferredSize( 0 ) ),
+                GetStartOffset( 1, GetTotalPreferredSize( 1 ) ),
+                0f
+            );
+
+            // 0 = first, 1 = last child
+            float lerp = 0;
+            //no need to catch divide by 0 as childCount > 0
+            float step = 1f / transform.childCount;
+
+            //normalize and create a distance between items
+            var dist = itemAxis.normalized * itemSize;
+
+            for ( int i = 0; i < transform.childCount; i++ )
+            {
+                RectTransform child = ( RectTransform )transform.GetChild( i );
+                if ( child != null )
+                {
+                    //stop the user from altering certain values in the editor
+                    m_Tracker.Add( this, child,
+                    DrivenTransformProperties.Anchors |
+                    DrivenTransformProperties.AnchoredPosition |
+                    DrivenTransformProperties.Pivot );
+                    Vector3 vPos = lastPos + dist;
+
+                    child.localPosition = lastPos = vPos + ( lerp - centerpoint ) * CurveOffset;
+
+                    child.pivot = pivot;
+                    //child anchors are not yet calculated, each child should set it's own size for now
+                    child.anchorMin = child.anchorMax = new Vector2( 0.5f, 0.5f );
+                    lerp += step;
+                }
+            }
+
+        }
+    }
+}