The shape's outline, sampled densely enough that consecutive points land on adjacent pins.
True when the last point joins back to the first, which decides whether the shape can be filled.
OptionalpartsThe pieces of a shape drawn in more than one piece, when it is.
One SVG path can hold several subpaths that do not touch: an error bar's two caps and its stem, a box plot's box and its whiskers, a region and its islands. points then runs through all of them, for measuring, and these say where the pen was lifted -- drawn as one run, the pieces come back joined by straight lines the chart never drew, which at whole-plot zoom land inside the mark but a few steps in cut across it as a slash.
A run of points in dot coordinates, taken from one SVG shape.