c# - Unity 2d coordinates

I'm trying to get a 2d tilemap rendering but somethings not clicking with me about the 2d coordinates...

Here's my basic tilemap class -

public class Map : MonoBehaviour {
public Transform tilePrefab;

public int mapWidth;
public int mapHeight;
public Transform[,] map;

// Use this for initialization

void Start () {
    map = new Transform[mapWidth, mapHeight];

    for (int y = 0; y < mapHeight; y++)
    {
        for (int x = 0; x < mapWidth; x++)
        {
            Transform tile = Instantiate(tilePrefab, new Vector3 (x, y, 0), Quaternion.identity) as Transform;
            tile.parent = transform;
            map[x, y] = tile;

        }
    }
}

But this is rendering the tilemap from the origin -

I want that tilemap to be dynamically centered on the camera like -

What I can't seem to work out is how to dynamically work out the coordinates to move that tilemap so that it's centered in the camera after it has been created?

Any additional help, or pointers to some decent resources would be much appreciated, cheers.

Answer

you can make prefabs child of another object.so when you move parent , childs move along parent.then place it center of your scene.

 clone.transform.parent = newEmptyGameObject.transform;

create empty Transform as spawnPoint

    if (spawnPoint != null)
        newEmptyGameObject.transform.position = spawnPoint.position;

I wrote a quick sample, the grid is always centered to the spawn position. You can adjust the following:

• number of objects in x and y direction, just like you already had it


• distance between objects in x and y direction (seperately)


• assign a transform which provides the spawn position, if it's null, the grid will stay at the world origin

Looks a bit confusing, but just to get an idea...

using UnityEngine;
using System.Collections.Generic;


public class GridManager : MonoBehaviour
{
    public int GridWidth;
    public int GridHeight;
    [Range(0,5)]
    public int distanceX;
    [Range(0,5)]
    public int distanceY;
    public Transform spawnPoint;
    public GameObject myPrefab;

    public List list = new List();

    void Start()
    {
        CreateGrid();
    }

    public void CreateGrid()
    {
        GameObject newEmptyGameObject = new GameObject("Grid");

        // following line is probably not neccessary
        newEmptyGameObject.transform.position = Vector3.zero;

        // some math to find the most left and bottom offset
        float offsetLeft = (-GridWidth / 2f) * distanceX + distanceX / 2f;
        float offsetBottom = (-GridHeight / 2f) * distanceY + distanceY / 2f;
        // set it as first spawn position (z=1 because you had it in your script)
        Vector3 nextPosition = new Vector3(offsetLeft, offsetBottom, 1f);

        for (int y = 0; y < GridHeight; y++)

        {
            for (int x = 0; x < GridWidth; x++)
            {
                GameObject clone = Instantiate(myPrefab, nextPosition, Quaternion.identity) as GameObject;
                clone.transform.parent = newEmptyGameObject.transform;
                // add to list
                list.Add(clone);

                // add x distance
                nextPosition.x += distanceX;

            }
            // reset x position and add y distance
            nextPosition.x = offsetLeft;
            nextPosition.y += distanceY;
        }
        // move the whole grid to the spawnPoint, if there is one
        if (spawnPoint != null)
            newEmptyGameObject.transform.position = spawnPoint.position;
    }
}

here you can change color of prefabs:

using UnityEngine;
using System.Collections;

public class Gem : MonoBehaviour
{
    private Color[] Colors = new Color[4] { Color.red, Color.blue, Color.green, Color.yellow };
    public int index;


    void Awake()
    {
        index = Random.Range(0, Colors.Length);
        var spriteRenderer = GetComponent();
        spriteRenderer.color = Colors[index];
    }
}