Geometry Handling

The basic geometrical element is the segment. A segment can be a line segment or a circular arc segment. A segment can be represented in R2-space or in R3-space.

A line segment is represented by its initial and terminal points, thus giving the segment a direction.

In R3, a third component z is added.

A circular arc segment is represented as the line but has also an amplitude vector (xh, yh).

In some cases in R2, the amplitude vector is replaced with a single number representing the length of the amplitude vector, i. e. the amplitude.

Continuous chains of segments can be combined to form contours.