CurvedLayout.cs created online with Bitbucket

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branch : freezyexp/curvedlayoutcs-created-online-with-bitbu-1463061990157

Scripts/Layout/CurvedLayout.cs

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+/// <summary>
+/// Curved Layout Group Created by Freezy - http://www.ElicitIce.com
+/// Posted on Unity Forums http://forum.unity3d.com/threads/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 desired pivot (should be moved into a utility function)
+            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;
+                }
+            }
+
+        }
+    }
+}