User Guide

Glyph Window
237
Curves and Lines
Graphical primitives are of three types: straight lines, Type 1 curves or
TrueType curves. Straight lines (we’ll call them vectors) are just straight
lines that connect two sequential nodes. Type 1 curves are Bezier curves
(3
rd
order, cubic b-splines). To modify the form of the curves two additional
sub-nodes are used:
Bezier Control Poin t
Bezier Curve
End Poin t
Control Vec tor
End Poin t
These sub-nodes are called control points and the vectors that connect the
control points with the curve’s ends are called control vectors. In the Glyph
Window vectors (straight lines) end in square (in black-white mode) or
red (in color mode) dots and curves end with round or green dots.