Circle

Property	Default	Meaning
center	[0.5, 0.5]	Center in the Circle's local rectangle
radius	0.5	Radius relative to the shorter side, or a px/em length

Circle has an intrinsic 1:1 aspect. Without a definite size its natural fallback is 16 × 16px; specifying width alone normally produces a circle of that diameter.

center is an { x, y } or [x, y] pair, defaulting to [0.5, 0.5] in the shape's own rectangle. radius is a scalar length, defaulting to 0.5 of the shorter side. Thus a default Circle remains circular and centered even inside a nonsquare allocation.

Coordinates and radius affect the drawing, not the allocated size. Moving the center or enlarging the radius can put ink outside that rectangle. Radius must be nonnegative; it is not automatically clamped to fit. A stroke also adds ink outside the circular boundary. See Group for positioning the entire element and Ellipse for unequal x/y radii.

Circle has no children. Compose a label with a stack or position it separately in a Group; do not nest Text inside the shape.