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I think I got the cause of the bug.
It computes the size of a tile in pixels and supposes it's always greater than 1. That is:
tileSize.width = (getWidth() - mapBorder*4) / mapSize.width;
tileSize.height = tileSize.width / 2;
If you get a width of less than 2, the height will be 0, which looks like what you've got here.
If you get a width of less than 1, it's rounded down to 0 and you whould have a black screen.
I fix that so there's a minimum size of 2/1. It would warrant some resizing, because right now that thing is computed at a somewhat weird time (setPreferredSize right after creation), but I'll fix that later (or not if I forget).
It computes the size of a tile in pixels and supposes it's always greater than 1. That is:
tileSize.width = (getWidth() - mapBorder*4) / mapSize.width;
tileSize.height = tileSize.width / 2;
If you get a width of less than 2, the height will be 0, which looks like what you've got here.
If you get a width of less than 1, it's rounded down to 0 and you whould have a black screen.
I fix that so there's a minimum size of 2/1. It would warrant some resizing, because right now that thing is computed at a somewhat weird time (setPreferredSize right after creation), but I'll fix that later (or not if I forget).
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