Incompatibilities with HP Piglet

PD Piglet does not support stretchable cells. Remove all lines that contain XA or YA commands.

PD Piglet uses Graffy's "SHOW #E" instead of "SHOW #A". Think of "E" as "everything" instead of the old "A" for "All". PD Piglet uses "A" as the component descriptor for "arcs".

The ADD Note and ADD Text commands have different semantics for the :Y command. In HP Piglet, the command controls the height of the text while leaving the width constant. This is awkward for typesetting because it indirectly controls the fontsize. In PD Piglet, the X width is controlled while leaving the font height unchanged.

Incompatibilities with Graffy

Piglet was designed to be close replica of "classic" HP Piglet. Graffy is heavily extended from Piglet's early codebase, so has many extra features including, but not limited to:

cross hatching

many more options to components

dimensioning constructs

...