add grid building system

Assets/Scripts/GridBuildingSystem.cs

@@ -0,0 +1,61 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Tilemaps;
+
+public class GridBuildingSystem : MonoBehaviour
+{
+  public PlaceableObject placeableObject;
+
+
+  public Tilemap collisionTm;
+
+  GameObject newBuilding;
+
+
+  private void Start()
+  {
+    newBuilding = Instantiate(placeableObject.prefab, Vector3.zero, Quaternion.identity);
+  }
+  private void Update()
+  {
+    if (newBuilding)
+    {
+      Vector3 newPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
+      //* Cursor.visible = false;
+      int snappedX = Mathf.RoundToInt(newPosition.x);
+      int snappedY = Mathf.RoundToInt(newPosition.y);
+      Vector3Int snappedPosition = new Vector3Int(snappedX, snappedY, 0);
+
+      newBuilding.transform.position = snappedPosition;
+
+      // TODO change to red if occupied
+
+      if (Input.GetMouseButtonDown(0) && !IsOccupied(snappedPosition, placeableObject))
+      {
+        placeableObject.Place();
+        // TODO mark tiles as occupied
+        // TODO unselect
+      }
+    }
+
+  }
+
+  private bool IsOccupied(Vector3Int startPos, PlaceableObject po)
+  {
+    Vector3Int poSize = new Vector3Int(po.width, po.height, 1);
+
+    BoundsInt area = new BoundsInt(startPos, poSize);
+    TileBase[] tileArray = collisionTm.GetTilesBlock(area);
+
+    foreach (TileBase tile in tileArray)
+    {
+      if (tile != null)
+      {
+        return true;
+      }
+    }
+
+    return false;
+  }
+}

Assets/Scripts/GridBuildingSystem.cs.meta

@@ -0,0 +1,11 @@
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+guid: 8c4997c1e7757ea49a7ea73e46e528c2
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scripts/PlaceableObject.cs

@@ -0,0 +1,16 @@
+using UnityEngine;
+
+[CreateAssetMenu(fileName = "New PlacableObject", menuName = "Harvestdale/PlaceableObjects", order = 0)]
+public class PlaceableObject : ScriptableObject
+{
+  public string objectName;
+  //   public Sprite icon;
+  public GameObject prefab;
+  public int width;
+  public int height;
+
+  public void Place()
+  {
+    Debug.Log("PLACE");
+  }
+}

Assets/Scripts/PlaceableObject.cs.meta

@@ -0,0 +1,11 @@
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+guid: 66971ee377514a046acbb1e1c0b45d44
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
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