font attributes

rpic extension, inspired by Pikchr. Five text attributes style each string individually: bold, italic, mono, font "<family>" and fontsize <points>. They bind like ljust/rjust — to the string they follow (or, written before any string, to the next one).

.PS
down
box "regular" fit
box "bold" bold fit
box "italic" italic fit
box "mono" mono fit
box "fontsize 18" fontsize 18 fit
.PE

Per-string, not per-object

Each string carries its own style, so one object can mix faces:

.PS
box wid 2 "Heading" bold "a quieter subtitle" italic fontsize 9
.PE

The attributes

Rules

• Geometry follows the style. fit, text bounding boxes and standalone-text default heights all use the styled metrics — "big" fontsize 22 takes a proportionally taller line, and a bold label gets a slightly wider fit box.
• PNG/PDF ship the faces. The renderer embeds the Go family (regular, bold, italic, bold-italic, mono, mono-bold), so bold/italic/mono rasterize faithfully on any machine. A font "…" family is resolved by the viewer for SVG; PNG/PDF fall back to the embedded face when the family isn’t bundled.
• Math lines are unaffected: a fully $…$ label under texlabels is typeset by the math renderer, which has its own faces.
• Contextual words: bold = 2 stays an assignment and box wid bold still reads the variable — only attribute position triggers. Unused, output is byte-for-byte classic (dpic errors on these words, so no valid dpic input changes meaning).