Sketcher Ellipse: porting tangent-line to DeriVector2
Replacing a ton of unreadable, sage generated math code with
easy-to-manage C++ code.
Sketcher Ellipse: porting internal align-t to DeriVector2
Sketcher Ellipse: small math refactor; const members
Moving the repeating code computing deriv+value of major radius to a
method of GCS::Ellipse.
Marking several methods of DeriVector2 as const member functions.
Sketcher Ellipse: porting arc angle rules to DeriVector2
Just porting.
Probably a complete remake of the concept is worth... Angles can be
calculated explicitly, there's no need to load the solver. I see no
benefits whatsoever on using the solver to keep track of angle values.
Sketcher Ellipse: porting equality to DeriVector2
8660d9a914