Fix FP exception in Wordrec::angle_change (issue #4242) #4243
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std::asin only allows arguments in [-1, 1], but rounding errors can produce values which are slightly outside of this range and which would cause a FP exception (or wrong calculation results). Rename also the internally used function `TPOINT::length` to `TPOINT::length2` because it calculates the square of the length. Signed-off-by: Stefan Weil <sw@weilnetz.de>
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std::asin only allows arguments in [-1, 1], but rounding errors can produce values which are slightly outside of this range and which would cause a FP exception (or wrong calculation results).
Rename also the internally used function TPOINT::length to TPOINT::length2 because it calculates the square of the length.