Geometry2d

The enclosed area, or 0 for anything open.

The four corners of Geometry2d.bounds.

The shortest distance from any point of this geometry to the segment A→B.

The enclosed area by the shoelace formula. Open geometry encloses nothing.

The bounds this geometry contributes to its shape. Memoized by bounds.

The total length of the outline, walked vertex to vertex.

This geometry as one subpath of an SVG d attribute.

@param first - whether this is the first subpath in the d. A later one starts with L rather than M, so it joins what came before instead of lifting the pen.

Flattened outline vertices in shape-local space.

Whether the segment A→B comes within distance of this geometry.

Whether point hits this geometry, within margin.

The interior counts when the shape is **filled**, or when the caller asks for hitInside — the two are alternatives, not a requirement and a refinement. hitInside means "count the interior of a HOLLOW shape too", which is what a marquee or a drop target wants; it is not the only way the interior is ever reachable.

This used to test hitInside alone, so a solid rectangle could not be selected by clicking its middle — only its outline answered. Nothing failed and nothing warned: every feature built on hit testing simply returned nothing, which reads as several unrelated bugs rather than one.

An unfilled shape still misses in the middle. A hollow rectangle is a frame around empty space, and clicking the space inside it should reach whatever is behind.

Whether a hit at _point should be discarded even though it landed. The default answer comes from the ignore flag; a subclass may look at where the hit was.

The point t of the way along the outline, t in [0, 1]. This is how a label, a handle or an arrow terminal is placed a fixed fraction along a shape's edge and stays there as the shape resizes.

Whether filters says to skip this geometry.

Whether point lies within the bounding box, which is the cheap pre-test.

The length of the outline — the perimeter, for anything closed.

Whether _polygon overlaps this geometry at all — including the case where one lies entirely within the other, which no edge crossing would reveal.

Serialize to the engine's flat path encoding.

The whole geometry as a standalone SVG path d.

This geometry seen through transform — the form a parent needs when it asks a child for its outline in the parent's own space. The result is a view onto this geometry, not a copy of it, so transforming is cheap.

The inverse of Geometry2d.interpolateAlongEdge: how far along the outline the nearest point to point sits, as a t in [0, 1].