Module scene 

Drawable scene document — engine-neutral primitives shared by Python & JS.

MVP: one molecule → one Viewport inside a Scene. Marks (atom/bond circles) and shade disks are layers on that viewport. Multi-mol diagrams / ELK are out of scope for the first shared paint path.

1. Language edge supplies coords + chem metadata (RDKit/Indigo/native layout + align stay outside this crate).
2. Rust builds a Scene of typed primitives (paths, circles, …).
3. Thin Python / JS serializers emit SVG / data-URI <img>.

Do not invent new depiction rules here — port proven Python behavior.

Structs

AtomIn

Atom input for a molecule depict call (SVG-space coords from the caller).

BondIn

Bond input (indices into AtomIn::index).

Layer

MoleculeIn

One molecule ready to paint (coords already in SVG / SCALE space).

Scene

Full drawable document before SVG/HTML serialization.

Viewport

One molecule viewport in a diagram (after ELK/grid placement).

Enums

LayerName

Layer name inside a molecule viewport.

Primitive

One drawable primitive in SVG space (+Y down).

TextAnchor

Horizontal text anchor (SVG text-anchor).

Functions

scale_path_d

Multiply every numeric token in an SVG path d (M/L/Z polygons).