Initial Commit

Assets/Scripts/UI/Tilemap/Brushes/Prefab Brush/Scripts.meta

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Assets/Scripts/UI/Tilemap/Brushes/Prefab Brush/Scripts/Editor.meta

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Assets/Scripts/UI/Tilemap/Brushes/Prefab Brush/Scripts/Editor/PrefabBrush.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+
+namespace UnityEditor
+{
+	[CreateAssetMenu]
+	[CustomGridBrush(false, true, false, "Prefab Brush")]
+	public class PrefabBrush : GridBrushBase
+	{
+		private const float k_PerlinOffset = 100000f;
+		public GameObject[] m_Prefabs;
+		public float m_PerlinScale = 0.5f;
+		public int m_Z;
+
+		public override void Paint(GridLayout grid, GameObject brushTarget, Vector3Int position)
+		{
+			// Do not allow editing palettes
+			if (brushTarget.layer == 31)
+				return;
+
+			int index = Mathf.Clamp(Mathf.FloorToInt(GetPerlinValue(position, m_PerlinScale, k_PerlinOffset)*m_Prefabs.Length), 0, m_Prefabs.Length - 1);
+			GameObject prefab = m_Prefabs[index];
+			GameObject instance = (GameObject) PrefabUtility.InstantiatePrefab(prefab);
+			if (instance != null)
+			{
+				Undo.MoveGameObjectToScene(instance, brushTarget.scene, "Paint Prefabs");
+				Undo.RegisterCreatedObjectUndo((Object)instance, "Paint Prefabs");
+				instance.transform.SetParent(brushTarget.transform);
+				instance.transform.position = grid.LocalToWorld(grid.CellToLocalInterpolated(new Vector3Int(position.x, position.y, m_Z) + new Vector3(.5f, .5f, .5f)));
+			}
+		}
+
+		public override void Erase(GridLayout grid, GameObject brushTarget, Vector3Int position)
+		{
+			// Do not allow editing palettes
+			if (brushTarget.layer == 31)
+				return;
+
+			Transform erased = GetObjectInCell(grid, brushTarget.transform, new Vector3Int(position.x, position.y, m_Z));
+			if (erased != null)
+				Undo.DestroyObjectImmediate(erased.gameObject);
+		}
+
+		private static Transform GetObjectInCell(GridLayout grid, Transform parent, Vector3Int position)
+		{
+			int childCount = parent.childCount;
+			Vector3 min = grid.LocalToWorld(grid.CellToLocalInterpolated(position));
+			Vector3 max = grid.LocalToWorld(grid.CellToLocalInterpolated(position + Vector3Int.one));
+			Bounds bounds = new Bounds((max + min)*.5f, max - min);
+
+			for (int i = 0; i < childCount; i++)
+			{
+				Transform child = parent.GetChild(i);
+				if (bounds.Contains(child.position))
+					return child;
+			}
+			return null;
+		}
+
+		private static float GetPerlinValue(Vector3Int position, float scale, float offset)
+		{
+			return Mathf.PerlinNoise((position.x + offset)*scale, (position.y + offset)*scale);
+		}
+	}
+
+	[CustomEditor(typeof(PrefabBrush))]
+	public class PrefabBrushEditor : UnityEditor.Tilemaps.GridBrushEditorBase
+	{
+		private PrefabBrush prefabBrush { get { return target as PrefabBrush; } }
+
+		private SerializedProperty m_Prefabs;
+		private SerializedObject m_SerializedObject;
+
+		protected void OnEnable()
+		{
+			m_SerializedObject = new SerializedObject(target);
+			m_Prefabs = m_SerializedObject.FindProperty("m_Prefabs");
+		}
+
+		public override void OnPaintInspectorGUI()
+		{
+			m_SerializedObject.UpdateIfRequiredOrScript();
+			prefabBrush.m_PerlinScale = EditorGUILayout.Slider("Perlin Scale", prefabBrush.m_PerlinScale, 0.001f, 0.999f);
+			prefabBrush.m_Z = EditorGUILayout.IntField("Position Z", prefabBrush.m_Z);
+				
+			EditorGUILayout.PropertyField(m_Prefabs, true);
+			m_SerializedObject.ApplyModifiedPropertiesWithoutUndo();
+		}
+	}
+}

Assets/Scripts/UI/Tilemap/Brushes/Prefab Brush/Scripts/Editor/PrefabBrush.cs.meta

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