segment

Segments are complex. They are the portion of an circle between a chord and the perimeter of the circle. dy sets the radius of the circle. Segments start with the center of the chord located at (0,0) and the chord horizontal. The half-width of the chord is set by dx. The portion of an circle lying below the chord is then added. The imaginary center of this circle is located at (0,-dy). The segment is then rotated by r and then translated by (cx,cy).