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Felix RiestraandClaude Sonnet 5 7cddf31bcb Add named parameters, UI scale setting, OPTIONS/OP dispatch, and help manual 
Named parameters (docs/named_parameters_design.md, stages 3-4):
- ParameterTable (src/scene/named_parameters.rs): a document-wide table of
  named formulas, each resolved through a shared expression evaluator with
  cross-parameter references, cycle detection, and division-by-zero/parse
  error reporting. SketchConstraint::driving_param becomes DrivingValue
  (Literal | Named) instead of a bare f64, resolved at solve time by
  sketch_solve::build_constraint via Scene::named_parameters.
- Persistence (src/scene/named_parameters_persist.rs): same lazy XRecord
  model sketch_persist.rs already established, synced around open/save.
  Bumps the sketch-constraint XRecord's own format version (1 -> 2) since
  DrivingValue's shape doesn't line up with a version-1 blob's bytes.
- PARAMETERS command and its editor (src/ui/window/named_parameters.rs):
  add/remove/edit rows, live validation, duplicate-name detection: Apply
  defines the table and re-solves every constraint scope with a
  named-parameter-driven constraint (command_driver.rs). Distance/Angle
  constraint prompts (modules/draw/constrain/value.rs) now accept either a
  literal or an existing parameter's name, mirroring how the constraint's
  own value prompt already worked.
- Undo scope-down carried over from this project's own established pattern
  (constraint-system stage 9): the geometry an Apply moves is one undo
  step, but the parameter table edit itself has no undo entry yet — a
  documented follow-up, not a silent gap.

UI scale setting (src/app/settings.rs, app/mod.rs, ui/window/options.rs):
  a whole-interface scale percentage (50-200%), wired directly into iced's
  own per-window scale_factor hook rather than per-panel font-size
  plumbing, so it applies immediately to every panel, dialog, and the
  ribbon at once. Persisted alongside the existing lineweight-display-scale
  setting.

OPTIONS/OP command dispatch (app/commands/view.rs, app/commands/mod.rs):
  OPTIONS was registered for autocomplete but had no dispatch arm — the
  Start-tab welcome screen's own button was the only way to reach it.
  Found live-testing the UI-scale setting, unrelated to that feature
  itself. "OP" is AutoCAD's own short alias.

help/: a new self-contained static user-help manual (manual.md as the
authored source, tools/build_help.py splits it into the committed static
HTML pages plus search index) — not yet wired into the application.

64 new/updated tests across the named-parameters and constraint-prompt
changes.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-09-09 13:50:08 +02:00

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<h1 class="content-title">Parametric Constraints</h1>
<h3 id="geometric-constraints">Geometric constraints</h3>
<p>Constraints capture relationships such as coincident, horizontal, vertical, parallel, perpendicular, equal, tangent, distance, angle, and radius. Use the degree-of-freedom and conflict indicators to understand the sketch state.</p>
<h3 id="editing-constrained-geometry">Editing constrained geometry</h3>
<p>Moving or grip-editing constrained geometry can move neighboring objects. If a solve fails or becomes redundant, inspect the constraint glyphs and conflict status before deleting geometry.</p>
<h3 id="persistence-and-history-limitations">Persistence and history limitations</h3>
<p>Constraint data is stored as OpenCAD Studio extension data inside DWG and DXF. Other applications may preserve it without interpreting it. Constraint edits and geometry changes may currently occupy adjacent history entries; verify the result after undo, redo, erase, copy, and reopen operations.</p>
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