Polyline

Property	Default	Meaning
points	[]	Ordered points in the selected coordinate space
closed	false	Close each finite run back to its first point
space	Automatic	Use ambient data coordinates when available; otherwise local geometry

Polyline connects points in order with straight segments. Each point is an object { x, y } or tuple [x, y]; both forms can be mixed. An empty list draws nothing. The path remains open unless closed is set. With gaps, each finite run is closed independently. Polygon is the convenience form with closing always enabled and the same coordinate behavior.

Outside a coordinate context, fractions map to the polyline's own allocated axes, with y increasing downward. Pixels and em are also accepted. Point bounds do not set its layout size or aspect.

Inside Graph, Plot, or GeoMap, each numeric vertex uses the ambient coordinate context automatically, just like Points. Set space="local" to opt out, or space="data" to require a coordinate context (and throw when none is available). Numeric vertices contribute to ordinary Graph/Plot limit inference; custom projections still require explicit output limits. Tagged px/em/% pairs bypass data mapping, while a custom projection rejects mixed data/length pairs. Data inputs also accept named numeric records such as {theta, r} or {x, y, z}.

Only supplied vertices are projected; add enough samples for curved routes. A null sample, any nonfinite dimension, or a projection returning null breaks the path, so visible vertices on opposite sides of a hidden point are not joined. Stroke widths remain ordinary layout lengths. See Projections. SymLine supplies function sampling.

Paint is inherited. Set fill={none} for a line chart: if you supply a fill, SVG fills the area as though the last point were connected to the first even though the stroked path stays open. stroke-linejoin controls the joins, and stroke-linecap controls the two open ends. There is no smoothing option; use Path for Bézier curves.