Thanks for the PR. I took a look and one thing I noticed is that tiles can be both flipped and rotated, but the code right now only handles one or the other.

Hello @straker Thanks for your feedback. If you're ok I will work on that point.
regards
@sdeseille

Hello @straker , would you help me to build a test and add it to your repo ? I studied how Tiled works and the way it save its maps and effectively you can't save a tile with the information that it is flipped and rotated. With a test it will be more simple to explain the cases.
@sdeseille

Sure. Here's the test file I was playing with. It takes the map pack Tileset from Kenney and just rotates the snowman to each position, then does the same with the image flipped both directions.

{ 
  "compressionlevel":-1,
 "height":4,
 "infinite":false,
 "layers":[
        {
         "data":[106, 2684354666, 3221225578, 1610612842,
            2147483754, 3758096490, 1073741930, 536871018,
            1073741930, 536871018, 2147483754, 3758096490,
            3221225578, 1610612842, 106, 2684354666],
         "height":4,
         "id":4,
         "name":"decoration",
         "opacity":1,
         "type":"tilelayer",
         "visible":true,
         "width":4,
         "x":0,
         "y":0
        }],
 "nextlayerid":5,
 "nextobjectid":1,
 "orientation":"orthogonal",
 "properties":[
        {
         "name":"sx",
         "type":"string",
         "value":"10"
        }, 
        {
         "name":"sy",
         "type":"string",
         "value":"10"
        }],
 "renderorder":"right-down",
 "tiledversion":"1.10.2",
 "tileheight":64,
 "tilesets":[
        {
         "columns":17,
         "firstgid":1,
         "image":"mapPack_tilesheet.png",
         "imageheight":768,
         "imagewidth":1088,
         "margin":0,
         "name":"mapPack_tilesheet",
         "spacing":0,
         "tilecount":204,
         "tileheight":64,
         "tilewidth":64
        }],
 "tilewidth":64,
 "type":"map",
 "version":"1.10",
 "width":4
}

Hi @straker, I created a sample on Codepen with your example. Thanks a lot, it permitted me to observe that my implementation is not fully compatible with Tiled. I am continuing to work on it.

Hello @straker I finally solved all cases to flip, rotate and flip-rotate the tile to be compatible with the tiled save format.
Can you take a look and give me some feedback?
regards
@sdeseille

Thanks for the updated code. Tested it and it works. The one thing it's lacking is some tests. I can go ahead and merge this and add them or if you'd like you can add some tests for diagonally rotated tiles following the same test I did for rotated tiles.

Hello @straker, thanks for your review.
I will follow the links you shared to add a new test for diagonally rotated tiles.

I'll keep you inform when i'm ready.

Regards

@sdeseille

Hello @straker, I understood how to add unit tests to cover the new features.
Take a look and give me your feedback.

regards
@sdeseille

Fantastic! Everything looks good. Thanks again for adding this.