The source code of Drawj2d is in the directory
net/sf/drawj2d

The other directories contain dependencies.
Required:
- java-getopt	gnu/getopt
- Hecl		org/hecl

Required for normal functionality
- EvalEx	com/udojava/evalex	for expr (math) command
- FreeHEP	org/freehep		for pdf, svg and emf output and fall-back mode for eps output

Additional functionality
- JLatexMath	org/scilab/forge/jlatexmath	for texlabel command
- G-geometry	no/geosoft/cc/geometry		for geom.* commands
- EpsGraphics	net/sf/epsgraphics	for eps output
- JTikZ		net/sf/jtikz		for TikZ output
