Keep engineering labels crisp

01 / TextCompose scripts without baseline drift

Labels take grouped _ and ^ scripts plus bounded commands such as \Omega, \pi, \theta, \mu, and \infty. Every generated tspan carries an explicit baseline correction, so a nested script returns the following text to the parent baseline exactly where the eye expects it.

Note that rotation stops at the vector. The label sits outside the rotated group, so a vertical component still reads horizontally:

inductor:L1 "L = 47 \muH" at (120, 160) #purple [orientation=up]
capacitor:C1 "C_{out} = 220 \muF" at (390, 160) #cyan [orientation=down]
qgate:Q1 "U_\theta" at (650, 160) #amber [parameter="\theta \le \pi" phase="e^{-i\omega t}"]
port:O1 "\Delta I_L" at (860, 160) #emerald

Width is estimated, not measured — no font is ever loaded. The estimator is deterministic and deliberately conservative, and a long label enlarges the component's bounds before placement is validated, which is what lets all of this work without an SSR-incompatible getBBox().

02 / QuantumUse polished custom gate rows

A named rotation gate carries its angle in parameter, and qgate shares hadamard's exact shell — same stub lengths, corner radius, focus treatment, and ports. Detail rows grow the body deterministically rather than by measurement.

prepare:P "|0\rangle" at (90, 150) #blue
ry:R "R_y" at (330, 150) #purple [parameter="\pi/3"]
zgate:Z "Z" at (540, 150) #cyan
measure:M "M" at (740, 150) #emerald

P.out -> R.in #blue [quantum line]
R.out -> Z.in #purple [quantum line]
Z.out -> M.in #cyan [quantum line]