- "offset" button like 2d CAD packages have
offset - creates a new line, parallel to a selection, at a given
distance on one (or both sides). In the case of a line, the new line
has the same length, and a perpendicular line will pass through the
endpoints of both the original and new line. For arcs, the start and
stop angles are preserved.
- "extend/trim" mode like 2d CAD packages have
extend/trim - using one line/arc as a boundary, change the length of
another line/arc so that its endpoint lies on the first geometry. In
the case of non-existent intersection of the as-drawn objects, the
algorithm may extend the reference geometry in order to find an
intersection.
-Ethan
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