METATeX is a set of plain TeX and METAFONT macros that you can use to define both the text and the figures in a single source file. Because METATeX sets up two way communication, from TeX to METAFONT and back from METAFONT to TeX, drawing dimensions can be controlled by TeX and labels can be located by METAFONT. Only standard features of TeX and METAFONT are used, but two runs of TeX and one of METAFONT are needed. The author is Ramon Casares.