The key tools here are functions to create 'sketchy' polygons, lines and points, and 'curvey' polygons and lines. Used in combination they can create grap]hics having a 'hand drawn' appearance in a number of styles - such as pencil-drawn or marker pen. The 'sketchy' renderings are based on the algorithms of Wood et. al.. These are useful in conveying ther fact that some data-driven graphics are based on vague or fuzzy information.
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