DIMLINEAR chose its measurement axis from the two extension line origins
alone, taking the longer of their x and y differences. Every line tilted
less than 45° therefore came out horizontal and stayed horizontal, no
matter where the dimension line was dragged.
The third pick is what answers the question. A linear dimension reports
the run or the rise; pulling the dimension line clear of the points above
or below asks for the horizontal distance, pulling it out to the side
asks for the vertical one.
"Clear of the points" is measured against their extent, not their
midpoint. A dimension line dragged straight up from near one end of a
long pair is still above them even though it is a long way from the
middle, and a midpoint test would call that sideways. When the location
is inside the pair on both axes it has not said anything yet, so the
longer side still decides.
Nothing else needed changing: the measurement already projects onto the
rotation axis, and the block builder already derives the dimension line
and both extension lines from it.
Closes#669
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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