CODEWITHSUNDEEP
unity-game-engine
jeffrey
jeffrey

Reputation: 3354

How can I get the x,y coordinate location of a tile in the tilemap?

I have just started getting used to using Unity's new tilemap tool (UnityEngine.Tilemaps).

One issue I am having is that I don't know how to get the x,y coordinates of a placed tile via script. I am trying to move a scriptableObject on the tilemap in script to a new location that the player clicks, but I don't know how to get the coordinates of the clicked tile location. There doesn't seem to be any position property for the Tile class (the Tile knows nothing about its location), so the Tilemap must have the answer. I was not able to find anything in the Unity documentation for how to get the Vector3 coordinates for a selected tile in the Tilemap.

Upvotes: 8

Views: 31208

Answers (2)

jeffrey
jeffrey

Reputation: 3354

I couldn't find a way to get the Grid's position from mouse click, so instead I used a Raycast to Vector3, and then converted that to coordinates via the WorldToCell method of the Grid component as per Shirotha's suggestion. This allows me to move the selected GameObject to a new position.

public class ClickableTile : MonoBehaviour
{
    public NormalTile normalTile;
    public Player selectedUnit;

    private void OnMouseUp()
    {
        // left click - get info from selected tile
        if (Input.GetMouseButtonUp(0))
        {
            // get mouse click's position in 2d plane
            Vector3 pz = Camera.main.ScreenToWorldPoint(Input.mousePosition);
            pz.z = 0;

            // convert mouse click's position to Grid position
            GridLayout gridLayout = transform.parent.GetComponentInParent<GridLayout>();
            Vector3Int cellPosition = gridLayout.WorldToCell(pz);

            // set selectedUnit to clicked location on grid
            selectedUnit.setLocation(cellPosition);
            Debug.Log(cellPosition);
        }
    }
}

On an aside, I know how to get the Grid location, but now how to query it. I need to get the GridSelection static object from Grid, and then get its position.

Upvotes: 6

Shirotha
Shirotha

Reputation: 141

If you have access to the Tile instance you can use its transform (or the raycast hit from the click) to get its world position and than get the tile coordinates via the WorldToCell method of your Grid component (look at the documentation).

EDIT:

Unity seems to not instantiate the tiles but instead uses only one tile object to manage all tiles of that type, i wasn't aware of that.

To get the correct position you have to calculate it yourself. Here is an example of how to get the tile position at the mouse cursor if the grid is positioned at the xy-plane with z = 0

// get the grid by GetComponent or saving it as public field
Grid grid;
// save the camera as public field if you using not the main camera
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
// get the collision point of the ray with the z = 0 plane
Vector3 worldPoint = ray.GetPoint(-ray.origin.z / ray.direction.z);
Vector3Int position = grid.WorldToCell(worldPoint);

Upvotes: 9

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