waypoints.cpp funtion CalculateHeadingToTarget
sint8 Mob::CalculateHeadingToTarget(float in_x, float in_y)
The possible values, from my testing, are [0 to 255] (inclusive). However, sint8 appears to only handle 8-bit ints, so [-128 to 127].
Most of the calls to this function are adjusting mob heading, which is a float and the problem i was seeing was that, as the mob crossed a South heading from West, 127 to 128, the value returned went from 127 to -128, which is incorrect.
Changing to sint16 corrected the problem as far as i can tell. It might also be possible to just change to uint16, since values are not negative, but i dunno if there is any gain in one vs. the other.
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