Strokes Skeletons And Envelopes

The constant thickness stroke is still the basic drawing primitive provided by most commercially available vector based drawing packages[34,39]. To create pictures like figures 2, 3, 17 and 19 with these packages usually involves scanning in an original copy (which has already been created on paper) or tracing out its outlines manually or automatically. Indeed, many impressive illustrations that fill the pages of manuals of many market-leading packages are there to demonstrate the package's automatic tracing or photo-retouching capabilities.

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