Replaces the .ssn-file workflow with an interactive one driven by the canvas:
- Structures (SS_INLET / SS_JUNCTION / SS_OUTFALL) prompt invert/rim/area/C on
the command line and commit a CIRCLE tagged with STORMSEWER_STRUCT XDATA
[kind, invert, rim, area, C]. Outfalls skip area/C.
- SS_PIPE picks a START and END structure (entity-pick), snapping its endpoints
to their centers, prompts diameter/n, and stores connectivity (the two
structure handles) in STORMSEWER_PIPE XDATA [diameter, n, from, to].
- SS_ANALYZE / SS_REPORT / SS_PROFILE rebuild the network from the drawn
entities (data.rs::network_from_entities) and analyze it directly; SS_ANALYZE
overlays flow/HGL labels without redrawing the geometry.
Because the data lives on the entities as XDATA, the network round-trips to
DWG/DXF. One additive line in src/app/update.rs adds SS_PIPE to the
inject_picked_entity allow-list so the command can read the picked structure's
center for snapping.
15 module tests cover the XDATA round-trip, analyze-from-drawing, and the
command step machines.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Adds a "Storm Sewer" ribbon tab backed by a new in-repo `stormsewer` engine
crate (vendored under crates/). The engine implements standard public-domain
methods — Rational-method peak-flow accumulation, Manning circular-pipe
hydraulics, time-of-concentration / IDF intensity, and an HGL backwater pass
with junction losses — with 24 unit tests and no external dependencies.
Module (src/modules/storm_sewer/):
- Drafting: SS_INLET / SS_JUNCTION / SS_OUTFALL place structure markers and
SS_PIPE chains pipe runs (interactive CadCommands).
- Analysis: SS_ANALYZE / SS_REPORT / SS_PROFILE open a .ssn network file, run
the engine, draw the plan and HGL long-section, and print a report.
- SVG icons; SS_* commands registered for command-line autocomplete.
Integration is additive: build.rs auto-discovers the module and one dispatch
block is added to src/app/commands.rs. 7 module integration tests.
See src/modules/storm_sewer/INTEGRATION.md for the design and the optional
follow-up (drive analysis from canvas geometry via XDATA).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
