Drawable

Objects that can be drawn are Drawable.
This is basically the case of geometric objects like Points, Lines, Circles etc.

Fields	Methods (provided)	Methods (must be reimplemented)
eps_filename	get_eps_filename()	into_euk()
euk_filename	get_euk_filename()
	set_name()
	into_pic()

set_name() is rewritten to forbid the renaming of Drawable objects
into_pic() will create the picture (thanks to data stored in the euk file)
into_euk() will create the euk file ; it must be implemented by each Drawable

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