margin

rpic extension, inspired by Pikchr. The margin variables add whitespace around the rendered canvas without moving a single object — geometry, anchors, ordinals and the current point are untouched.

.PS
margin = 0.25
box "breathing room" fit
.PE

The variables

Side values are additive, so this pads everywhere except the left:

.PS
margin = 0.2
leftmargin = -0.2
box "asymmetric" fit
.PE

Rules

• Margins are pic dimensions: they follow scale, .PS width sizing and maxpswid/maxpsht clamping like visible geometry.
• They affect only the native SVG/PNG/PDF canvas framing — never layout. With all margins 0 (the default), output is byte-for-byte classic.
• The practical use: give labels near the canvas edge headroom (text metrics are estimates, in rpic as in dpic), or reserve space for animations that overshoot.

Design notes: docs/pikchr.md.