Construction tools for digitizing

Add new digitizing tools for geometric construction of features.

Arc Intersection

Construction

• select two points P1, P2 and a distance d1, d2 for each point
• get intersection point(s) of the circle with radius d1 centered on P1 and the circle with radius d2 centered on P2

Orthogonal Lines

Construction

• select two points P1, P2 defining a base line l
• select distance x along the base line (abscissa)
• select distance y perpendicular to the base line (ordinate)
• get linestring starting at P1 along l of length x, then y units perpendicular from that point