Insanely huge initial commit

Assets/Extensions/Le Tai's Asset/TranslucentImage/Demo/Scripts/ControlCenter.cs

@@ -0,0 +1,32 @@
+using UnityEngine;
+using UnityEngine.EventSystems;
+
+namespace LeTai.Asset.TranslucentImage.Demo
+{
+    public class ControlCenter : MonoBehaviour
+    {
+        public RectTransform handle;
+        RectTransform        rt;
+
+        void Start()
+        {
+            rt = GetComponent<RectTransform>();
+        }
+
+        void Update()
+        {
+            if (Mathf.Approximately(handle.rect.height, 0))
+                return;
+            rt.anchoredPosition = new Vector2(
+                rt.anchoredPosition.x,
+                Mathf.Clamp(rt.anchoredPosition.y, -rt.rect.height / 2 + handle.rect.height, rt.rect.height / 2 - 1)
+            );
+        }
+
+        public void Drag(BaseEventData baseEventData)
+        {
+            PointerEventData data = (PointerEventData) baseEventData;
+            rt.position = new Vector2(rt.position.x, rt.position.y + data.delta.y);
+        }
+    }
+}