are the more recent structured document classes of ivtools
). They are structured document objects that can do some structured graphics as well. The most complex example program for glyphs
that came with InterViews
3.1 is a structured document editor, doc. A derivative of doc called lexi
was the source examined in the first Design Patterns
Programming and debugging with them is quite a different thing from programming and debugging with libgraphic or Unidraw. The rendering is procedural and TeX like, and requires a tracing of the layout process to debug. Fresco glyphs are multi-platform glyphs evolved from InterViews glyphs.