xfig

Xfig is an X Window System tool for creating basic vector graphics,

including arcs, ellipses, bezier curves, lines, rulers and more.

The resulting graphics can be saved, printed on PostScript printers

or converted to a variety of other formats (e.g., X11 bitmaps, CGM,

Encapsulated PostScript, LaTeX).

You should install xfig if you need a program to create vector graphics.