2D Get Object Height to stack up on the screen

[ace2df]

I’m trying to get these objects in a line connected to each other but it’s not working out too well.

void StackUp()
{
	tempHolder = new GameObject("Holder").transform;
	tempHolder.SetParent(boardHolder);

	GameObject instance;
	for (int y = startPos; y < endPos; y++)
	{
		GameObject toInstantiate = lineTiles[Random.Range(0, lineTiles.Length)];
		instance = Instantiate(toInstantiate, new Vector3 (0, currentPos, 0f), Quaternion.identity) as GameObject;
		currentPos += (float)instance.GetComponent<Collider2D>().bounds.size.y;
		instance.transform.SetParent(tempHolder);
	}
}

The objects in lineTiles are different sizes in height and width.

I can’t seem to get them to stay connected though. I think it would have to do with currentPos but no idea what I’m doing wrong to get it like this:

There are also some objects hidden under each other:

[toromano]

You should consider each gameobject size and center separately:

for (int y = startPos; y < endPos; y++)
     {
         float currentPos = .0f;
         GameObject toInstantiate = lineTiles[Random.Range(0, lineTiles.Length)];
         instance = Instantiate(toInstantiate, new Vector3 (0, currentPos, 0f), Quaternion.identity) as GameObject;
         float size = (float)instance.GetComponent<Collider2D>().bounds.size.y;
         instance.transform.position = new Vector3(0,currentPos + size/2,0); // center position of the gameobject
         currentPos += size; //up position of the gameobject
         instance.transform.SetParent(tempHolder);
     }