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Assets/OtherPlugins/UI Spline Renderer/Example/Scripts/DraggableSplinePointExample.cs

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+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.Splines;
+using UnityEngine.UI;
+
+namespace UI_Spline_Renderer.Example
+{
+    public class DraggableSplinePointExample : MonoBehaviour, IDragHandler, IBeginDragHandler, IEndDragHandler
+    {
+        public UISplineRenderer uiSplineRenderer;
+        public Image myImage;
+        public int splineIndex;
+        public int knotIndex;
+        public Color connectedColor;
+        public bool isConnected;
+        BezierKnot _originalKnot;
+        
+        /*
+         * You must set false of the raycastTarget value of the UISplineRenderer and Image of this gameObject OnBeginDrag().
+         * Because it can block the raycast going to a port that pointer hovered.
+         */
+        
+        public void OnDrag(PointerEventData eventData)
+        {
+            var pos = transform.parent.InverseTransformPoint(eventData.position);
+            var knot = new BezierKnot(pos);
+            uiSplineRenderer.splineContainer[splineIndex].SetKnot(knotIndex, knot);
+        }
+
+        public void OnBeginDrag(PointerEventData eventData)
+        {
+            uiSplineRenderer.raycastTarget = false;
+            myImage.raycastTarget = false;
+            
+            uiSplineRenderer.color = Color.white;
+            if(!isConnected)_originalKnot = uiSplineRenderer.splineContainer[splineIndex][knotIndex];
+        }
+
+        public void OnEndDrag(PointerEventData eventData)
+        {
+            foreach (var go in eventData.hovered)
+            {
+                if (go.GetComponent<DragPortExample>())
+                {
+                    Connect(go.transform);
+                    uiSplineRenderer.raycastTarget = true;
+                    myImage.raycastTarget = true;
+                    return;
+                }
+            }
+            Disconnect();
+        }
+
+        void Connect(Transform t)
+        {
+            var pos = transform.parent.InverseTransformPoint(t.position);
+            var knot = new BezierKnot(pos);
+            uiSplineRenderer.splineContainer[splineIndex].SetKnot(knotIndex, knot);
+            uiSplineRenderer.color = connectedColor;
+            isConnected = true;
+        }
+
+        void Disconnect()
+        {
+            uiSplineRenderer.color = Color.white;
+            uiSplineRenderer.splineContainer[splineIndex].SetKnot(knotIndex, _originalKnot);
+            isConnected = false;
+            uiSplineRenderer.raycastTarget = true;
+            myImage.raycastTarget = true;
+        }
+    }
+}