if one limits oneself to 2D (one interesting example of this is the use of a JavaScript to generate G-Code from vectors w/in the page layout program InDesign (see IterativePathCuts (unfortunately limited to straight lines) at Silicon Publishing: Resources, forum discussion)). Please note that it is possible to use pretty much any vector drawing program for design, esp. Academic paper discussing this G codes for the specification of Pythagorean-hodograph tool paths. One concern with CAD is a fundamental aspect of their architecture: How are curves, arcs and circles handled? All- too-many programs take the expedient route of representing them as as polygons or polylines.
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