Get if a tilemap tile is flipped

So you can rotate tiles in a tilemap by pressing [ or ], which can then be retrieved via

Code (CSharp):

1. tilemap.GetTransformMatrix(Vector3Int).rotation

But you can also flip a tile via shift + [ or shift + ]. How does one get if a tile is flipped via code?

 

Hey!
I am pretty sure that you could find something in the TileBase.GetTileData (https://docs.unity3d.com/ScriptReference/Tilemaps.TileData-transform.html) from the tileData (https://docs.unity3d.com/ScriptReference/Tilemaps.TileBase.GetTileData.html).

You could probably check the diagonal values of this matrix. Top-left is x, next one is y. If any of those is negative it means that the Tile is flipped on this axis. https://www.brainvoyager.com/bv/doc...Transforms/SpatialTransformationMatrices.html

Still maybe there is a better way.

I hope it helps!

 

Hi,

I think @SunnyValleyStudio is probably right (BTW - good YT tutorial channel!).

Personally I haven't done such thing in the past, but you can get and set tilemap tile values. To get a tile use its position:

Code (CSharp):

1. var pos = new Vector3Int(1, 1, 0);
2. var tile = tilemap.GetTile(pos);

Then you can rotate and flip it, flipping can be done at least with negative scaling like mentioned already:

Code (CSharp):

1. // flip
2. Matrix4x4 matrixFlip = Matrix4x4.Scale(new Vector3(-1f, 1f, 1f));
3. tilemap.SetTransformMatrix(pos, matrixFlip);
4. tilemap.RefreshTile(pos);

Then you can get the transform of some tile by using tile position again. Proceed based on its value (*in this case I'm only Debug.Logging it):

Code (CSharp):

1. // get value
2. Debug.Log("transform is: " + tilemap.GetTransformMatrix(pos));
3.  
4. // transform is:
5. // -1.00000 0.00000 0.00000 0.00000
6. //  0.00000 1.00000 0.00000 0.00000
7. //  0.00000 0.00000 1.00000 0.00000
8. //  0.00000 0.00000 0.00000 1.00000

 

Thanks for the helpful info! Had to teach myself some matrices but I think I figured it out.
A non flipped, non rotated tile has the matrix value of

Code (CSharp):

1. 1.00000    0.00000    0.00000    0.00000
2. 0.00000    1.00000    0.00000    0.00000
3. 0.00000    0.00000    1.00000    0.00000
4. 0.00000    0.00000    0.00000    1.00000

A tile flipped on the X axis has a matrix value of

Code (CSharp):

1. -1.00000   0.00000   0.00000   0.00000
2. 0.00000   1.00000   0.00000   0.00000
3. 0.00000   0.00000   1.00000   0.00000
4. 0.00000   0.00000   0.00000   1.00000
5.  

and finally a tile flipped on the Y axis has a matrix value of

Code (CSharp):

1. 1.00000    0.00000    0.00000    0.00000
2. 0.00000    -1.00000    0.00000    0.00000
3. 0.00000    0.00000    1.00000    0.00000
4. 0.00000    0.00000    0.00000    1.00000
5.  

So to get if a tile is flipped, simply check if

Code (CSharp):

1. tilemap.GetTransformMatrix(pos).m00 == -1 //X axis
2. tilemap.GetTransformMatrix(pos).m11 == -1 //Y axis
3.  
4.  

There is really no distinction in the backend if a tile is flipped or rotated as both simply update this matrix as it seems.