Saving Grids in Grid System

Questions & Answers
1

I’m creating a grid system and allowing players to utilize multiple units to put furniture. The problem is, I have a script that is not working the way I intend:

  1. Units hovered over change material color to red
  2. Units that are clicked are saved in a list
  3. All units saved in the list are changed to blue

I have 1 and part of 2 finished. The problem is with 2, it seems like only one item is being saved. And when I run 3, the colors do not change at all.

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class GridUnitScript : MonoBehaviour {
	public Vector3 originalPos;
	public Vector3 currentPos;
	public GameObject GridUnit;
	public Rect selectionBox;

	public List<Collider> unitsClicked = new List<Collider>();
	
	void selections() {
		
	}

	void Start () {
		//Change all color of units to Gray. Replace this with material later on.
		GetComponent<Renderer>().material.color = Color.gray;
	}

	void Update () {
		//Rectangle for box selection for future.
/*			selectionBox = new Rect(Mathf.Min(originalPos.x, currentPos.x), 
			                        Mathf.Min(originalPos.y, currentPos.y),
			                        Mathf.Abs(originalPos.x - currentPos.x),
			                        Mathf.Abs(originalPos.y - currentPos.y));	*/
	}
	/*void OnMouseEnter() {
		GetComponent<Renderer>().material.color = Color.red;
	}*/
	void OnMouseOver() {
		//Change color to blue when mouse is hovered over. This is working
		GetComponent<Renderer>().material.color = Color.blue;
	}
	void OnMouseExit() {
		//Change color back to gray when mouse moves away from unit. This is also working
		GetComponent<Renderer>().material.color = Color.gray;
	}
	void OnMouseDown() {
		//Create raycast when mouse is pressed down over collider
		RaycastHit hitInfo = new RaycastHit();
		Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
		if (Physics.Raycast(ray, out hitInfo)) {
			//Add the hit collider into the unitsClicked list
			unitsClicked.Add(hitInfo.collider);
			//Go through the list and change color to red
			foreach (Collider col in unitsClicked) {
				col.GetComponent<Renderer>().material.color = Color.red;
				Debug.Log(col);
			}
		}

	}
	void OnMouseDrag() {

	}
}
2

So I figured out the problem. The problem was the first two onmouse functions were doing stuff so I just had to put conditionals.

Something like this:
using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class GridUnitScript : MonoBehaviour {
	public Vector3 originalPos;
	public Vector3 currentPos;
	public GameObject GridUnit;
	public Rect selectionBox;

	public List<Collider> unitsClicked = new List<Collider>();
	
	void selections() {
		
	}

	void Start () {
		//Change all color of units to Gray. Replace this with material later on.
		GetComponent<Renderer>().material.color = Color.gray;
	}

	void Update () {
		//Rectangle for box selection for future.
/*			selectionBox = new Rect(Mathf.Min(originalPos.x, currentPos.x), 
			                        Mathf.Min(originalPos.y, currentPos.y),
			                        Mathf.Abs(originalPos.x - currentPos.x),
			                        Mathf.Abs(originalPos.y - currentPos.y));	*/
	}
	/*void OnMouseEnter() {
		GetComponent<Renderer>().material.color = Color.red;
	}*/
	void OnMouseOver() {
		//Change color to blue when mouse is hovered over. This is working
		if (GetComponent<Renderer>().material.color != Color.red) {
			GetComponent<Renderer>().material.color = Color.blue;
		}
	}
	void OnMouseExit() {
		//Change color back to gray when mouse moves away from unit. This is also working
		if (GetComponent<Renderer>().material.color == Color.blue) {
			GetComponent<Renderer>().material.color = Color.gray;
		}
	}
	void OnMouseDown() {
		//GetComponent<Renderer>().material.color = Color.red;
		//Create raycast when mouse is pressed down over collider
		RaycastHit hitInfo = new RaycastHit();
		Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
		if (Physics.Raycast(ray, out hitInfo)) {
			//Add the hit collider into the unitsClicked list
			unitsClicked.Add(hitInfo.collider);
			//Go through the list and change color to red
			foreach (Collider col in unitsClicked) {
				col.GetComponent<Renderer>().material.color = Color.red;
				Debug.Log(col);
			}
		}

	}
	void OnMouseDrag() {

	}
}