Instantiate prefab randomly but not in already genrated position

Question

I want to generate bubble randomly in my screen.When bubble is generated in one place then other bubble can not generated near of its radius 1 area. means bubbles can not collide or triggered with any other bubbles.

How can i do it ?

public void GenerateBubble ()
        {
                newBubbleXPos = Random.Range (-7, 7);
                newBubbleYPos = Random.Range (-3, 3);
                bubbleClone = (GameObject)Instantiate (bubblePrefab, new Vector3 (newBubbleXPos, newBubbleYPos, 0), Quaternion.identity);
                UIManager.instance.ChangeBubbleSprite (bubbleClone);
                bubbleList.Add (bubbleClone);
                if (bubblePosList.Contains (bubbleClone.transform.position)) {
                    bubbleClone.transform.position=new Vector3(Random.Range (-7,7),Random.Range (-3,3),0);
                }
                bubblePosList.Add (bubbleClone.transform.position);
                bubbleClone.transform.parent = UIManager.instance.CurrentLevel.transform;
                GLOBALS.bubbleCounter++;
        }

In this my code every bubble is generated in different position but it can collide with other bubble means i want to generate new bubble not same position as well as it can not collide also. My bubble colliders's radius is 1.

Answer 1

I have Found Answer :

    public List<GameObject> bubbleList = new List<GameObject> ();
    private int newBubbleXPos;
    private int newBubbleYPos;

public void GenerateBubble ()
    {
        bool locationInvaild = true;
        while (locationInvaild) {
            newBubbleXPos = Random.Range (-8, 8);
            newBubbleYPos = Random.Range (-4, 4);
            currentPosition = new Vector3 (newBubbleXPos, newBubbleYPos, 0);
            locationInvaild = false;
            for (int i=0; i<bubbleList.Count; i++) {
                if (Vector3.Distance (bubbleList [i].transform.position, currentPosition) < 2.5f * radius) {
                    locationInvaild = true;
                    break;
                }
            }
        }
        bubbleClone = Instantiate (bubblePrefab, new Vector3 (newBubbleXPos, newBubbleYPos, 0), Quaternion.identity) as GameObject;
        bubbleList.Add (bubbleClone);
    }