Extending your ability to extend ggplot2
summary
Shows how to add a new stat/geom by subclassing ggplot2’s ggproto classes, implementing setup_data and compute_group to turn (x0,y0,r) into polygon points, and returning grid grobs so it renders. Demonstrates a working geom_circle built from an R function that precomputes periphery points, explains when to vectorize at compute_panel for speed, and confirms the extension honors facets and existing ggplot2 semantics.
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chapters (6)
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