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Assets/Scripts/PlaceableStreetObjectChild.cs

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+using System.Collections.Generic;
+using UnityEngine;
+
+public class PlaceableStreetObjectChild : MonoBehaviour
+{
+
+    public bool placeable = true;
+    public List<Collision2D> currentCollisions = new List<Collision2D>();
+    public TrafficNode snappingNode = null;
+
+    private void Update()
+    {
+        transform.localPosition = new Vector3(0.5f, 0f, 0f);
+        CheckPlaceable();
+    }
+
+    private void LateUpdate()
+    {
+        if (placeable)
+        {
+            GetComponent<SpriteRenderer>().color = Color.blue;
+        }
+        else
+        {
+            GetComponent<SpriteRenderer>().color = Color.red;
+        }
+    }
+
+    private void CheckPlaceable()
+    {
+        // DEBUG LOG
+        Debug.Log("--------------------------------------");
+        foreach (Collision2D collision in currentCollisions)
+        {
+            Debug.Log(collision.gameObject.name);
+        }
+
+
+
+        // If a snapping node is present -> its allowed to collide with all node of the SAME street
+        if (snappingNode != null)
+        {
+            bool foundBadCollision = false;
+            foreach (Collision2D collision in currentCollisions)
+            {
+                if (collision.collider)
+                {
+                    if (collision.collider.transform.tag == "TrafficNode")
+                    {
+                        if (collision.collider.GetComponent<TrafficNode>().GetParentStreet() != snappingNode.GetParentStreet())
+                        {
+                            foundBadCollision = true;
+                        }
+                    }
+                    else if (collision.collider.transform.tag == "Street")
+                    {
+                        if (collision.collider.GetComponent<Street>() != snappingNode.GetParentStreet())
+                        {
+                            foundBadCollision = true;
+                        }
+                    }
+                    else
+                    {
+                        Debug.Log("No Street or node");
+                        foundBadCollision = true;
+
+                    }
+                }
+                else
+                {
+                    Debug.Log("No collider");
+                    foundBadCollision = true;
+                }
+            }
+            placeable = !foundBadCollision;
+        }
+        else
+        {
+            if (currentCollisions.Count > 0)
+            {
+                placeable = false;
+            }
+        }
+    }
+
+    private void OnCollisionEnter2D(Collision2D c)
+    {
+        currentCollisions.Add(c);
+    }
+
+    private void OnCollisionExit2D(Collision2D c)
+    {
+        currentCollisions.Remove(c);
+    }
+}