Arc

Property	Default	Meaning
center	[0.5, 0.5]	Center of the ellipse
radius	0.5	Scalar radius or independent { x, y } / [x, y] radii
start	0	Starting screen-space angle in degrees
end	360	Ending screen-space angle in degrees
space	Automatic	Use ambient data coordinates or local geometry

An ellipse segment with center, scalar or paired radius, and start/end angles in degrees. Defaults: center {x:0.5,y:0.5}, radius 0.5, angles 0–360. The span may be at most one turn. In data space, numeric radii are data distances and flips affect orientation. Cubic pieces approximate the ellipse.

Center and paired radii accept {x,y} or [x,y]. Under projection, the center also accepts arbitrary numeric records. Projected radii must be local lengths, such as px(20); use sampled Polyline points for a curve defined in the source coordinate space.

Inside Graph, numeric geometry uses data coordinates; outside it, geometry uses local fractions/px/em. space="local" opts out of an ambient graph, and space="data" requires one. Pixel strokes keep their size.