close

rpic extension, inspired by Pikchr. close turns a multi-segment line into a polygon: rpic appends the closing segment and renders a true SVG <polygon> — fillable like any closed shape.

.PS
line right 1 then up 0.7 close shaded "gold" outlined "darkgreen"
"triangle" at (0.5, -0.22)
line from (1.5, 0) right 0.7 then up 0.7 then left 0.7 close crosshatch hatchsep 0.06
"square" at (1.85, -0.22)
.PE

Note the second polygon starts with an explicit from: after close, the current point returns to the polygon’s first point (as if the closing segment walked back), so chaining with bare move would overlap.

Rules

• At least three vertices must exist before close; fewer is an error.
• close ends the route — then, to, by or a direction after it is an error (“polygon is closed”).
• .end and the current point become the first point, as if the final segment explicitly returned there; .c and attached labels use the polygon’s bounding-box center.
• All fill machinery applies: shaded, fill, hatch, gradient, opacity.

dpic has no close (it reads it as a variable), so for byte-compatible classic sources, close the path the classic way instead:

.PS
A: (0,0); B: (1,0); C: (0.5,0.7)
line from A to B then to C then to A shaded "honeydew"
.PE

Design notes: docs/dpic-compat-audit.md.