Module metrics 

Depiction proportions (xenopict / RDKit house style).

Keep in sync with python/xpict/draw/metrics.py.

Constants

BOND_PX

Bond length in drawing / CSS-px units (alias of SCALE).

CHAIN_END_GAP_FRAC

CHAIN_END_GAP_PX

END_GAP_FRAC

END_GAP_PX

FONT_FRAC

Atom-label em as a fraction of bond length.

FONT_PX

FONT_STEM_EM

Liberation Sans Regular vertical stem width in em.

FONT_STEM_EM_BOLD

Liberation Sans Bold vertical stem width in em (measured on H).

HALO_FRAC

HALO_GAP_PX

Halo outline grow (half the label-gap air) + soft white fill.

HALO_OPACITY

HALO_STROKE

HASH_PER_BOND

LABEL_GAP_FRAC

LABEL_GAP_PX

MARK_FRAC

MARK_HALO_COLOR

xenopict mark halo <use stroke="#555">.

MARK_HALO_OPACITY

MARK_HALO_STROKE_FRAC

xenopict mark halo (<use>): stroke-width: scale * 0.2, opacity 0.45.

MARK_HALO_STROKE_PX

MARK_OPACITY

MARK_STROKE_FRAC

xenopict mark layer: stroke-width: scale * 0.1, opacity 0.7.

MARK_STROKE_PX

OFFSET_FRAC

RDKit multipleBondOffset.

OFFSET_PX

PAD_FRAC

PAD_PX

SCALE

xenopict Xenopict.scale / xenosite depiction "scale": 20.

SCRIPT_SCALE

RDKit DrawText::SUBS_SCALE / SUPER_SCALE for H-counts and charges.

SHADE_FRAC

STAR_FRAC

Dummy / R-group * height as a multiple of Liberation cap-height.

STROKE_FRAC

Bond stroke as a fraction of bond length — tracks the label stem so ink weight matches letter stems when FONT_FRAC changes.

STROKE_PX

WEDGE_HALF_PX

WEDGE_WIDTH_FRAC

Full wedge width at the fat end, as a fraction of bond length.

WEIGHT_AT_ONE

Absolute ink multiplier at user-facing weight = 1 (house look).

WEIGHT_MIN

Lowest user-facing weight (maps to absolute ink 1 = Regular stem).

Functions

diagram_weight

Map user-facing mol weight → absolute ink multiplier (≥ 1).

halo_gap_for_weight

Outer halo buffer for mol weight: HALO_GAP_PX × √ink.

halo_stroke_for_weight

Halo stroke for mol weight: HALO_STROKE × √ink (sublinear vs ink).

halo_stroke_from_stroke

Halo stroke width tracks active bond ink (2×, same ratio as HALO_FRAC).

hash_count

Dash count scaling with drawn bond length (hashed wedges).

label_weight_grow_px

Outward glyph buffer (px) so absolute ink stems grow past Regular.

label_weight_standoff_px

Extra bond↔label standoff (px) when absolute ink exceeds Regular.

stroke_frac_from_stem

Bond stroke fraction from a stem width in em (rounded like STROKE_FRAC).

stroke_px_for_weight

Bond stroke in drawing px for user-facing mol weight.

stroke_px_from_stem

Bond stroke in drawing px keyed to a label stem.