This is a really basic test of a supercover algorithm (for determining which grids in a square a line from square 1 to square 2 crosses). Potentially useful for collision detection or line of sight.
Algorithm is cribbed from online (with minor tweaks), and this is otherwise quite simple. Mostly a proof of concept, and to see how well it performed within PICO 8.
Up / Down / Left / Right: move the end point.
Z: change which end point you're moving
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