fit

rpic extension, inspired by Pikchr. fit sizes a box, ellipse or circle to the text already attached to it — no more guessing wid.

.PS
box "short" fit
move
box "a considerably longer label" fit
move
ellipse "two" "lines" fit
.PE

Rules

• Only text before fit contributes to the fitted size; later text stays attached but doesn’t resize.
• Explicit dimensions win: wid/ht keep their values on boxes and ellipses, rad/diam on circles.
• Using fit with no preceding visible text is an error.
• The metrics are rpic’s text estimates — practical and backend-stable, but approximate. With texlabels math, metrics are exact, so fitted math boxes are tight:

.PS
texlabels = 1
box "$e^{j\pi} + 1 = 0$" fit
.PE

Classic input without fit keeps its dpic-compatible dimensions.