Keep engineering labels crisp

01 / TextCompose scripts without baseline drift

There is no TeX runtime here, and the labels still read like engineering. Grouped _ and ^ scripts nest, and bounded commands such as \Omega, \pi, \theta, \mu, and \infty resolve to glyphs — and since 1.0, so do \langle, \rangle and \oplus, so |0\rangle reads as the ket it is. Each generated tspan carries an explicit baseline correction, so text following a nested script lands back on the parent baseline rather than drifting. Rotation stops at the vector: the label sits outside the rotated group and stays upright.

source:V5 "V_{ref}^{\pm}" at (100, 150) #blue [type=voltage-dc]
inductor:L5 "4.7 \mu H" at (330, 150) #cyan [orientation=down]
qgate:Q5 "R_y" at (570, 150) #purple [parameter="\pi/8" phase="e^{i\theta}"]
port:O5 "\langle Z \rangle" at (800, 150) #emerald

Width is measured from a table, never from a browser — no font is loaded at any point. 1.0 carries Arial's advance widths, which Helvetica, Liberation Sans and Arimo share, and names that stack as the SVG's default font, so the estimate is within 1.5% of the rendered width across the vocabulary. Text is compressed with textLength only when it would overflow its space and is never stretched. A long label still grows the component's bounds before placement is validated, which is what lets the whole thing work without an SSR-incompatible getBBox(). A page whose CSS sets a wider face on the SVG will see labels overrun the space measured for them.

02 / QuantumUse polished custom gate rows

qgate is the escape hatch, and it shares hadamard's exact shell — same stub lengths, corner radius, focus treatment, and ports. Its parameter, phase, and matrix rows grow the body deterministically, so a custom operator can wear its own definition without becoming a different kind of object.

prepare:PE "|-\rangle" at (80, 130) #blue
ry:RE "R_y" at (270, 130) #cyan [parameter="2\theta"]
qgate:UE "V" at (480, 130) #purple [parameter="\gamma" matrix="[p,q;r,s]"]
measure:ME "M_x" at (700, 130) #emerald

PE.out -> RE.in #blue [quantum line]
RE.out -> UE.in #cyan [quantum line]
UE.out -> ME.in #purple [quantum line]