Hey, sorry if I'm in the wrong forum, but I need some help with getting the left and top values for a tile from a tile set. A book I have gives these two formulae:

```
left = (current frame % number of columns) * sprite width
top = (current frame / number of columns) * sprite height
```

Now, I'm no expert, but these seem completely wrong.

For the left value, I came up with:

`left = ((current frame-1) % number of columns) * width`

This seems to work based on my testing

For top, I came up with:

`top=((current frame/cols) - 1) * height`

but after testing found that it only works for tiles on the right side of the set.

Does anyone know a formula I can use for the top value/check if the one I have for left value make sense/check if the original two in my book were fine and I'm just crazy. Thanks. :)