Feat/align with #34

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dstadelm wants to merge 8 commits from dstadelm/circuiteria:feat/align-with into main
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Allows to align ports with other ports or cetz anchor points. This allows for nicer wire routing.

Allows to align ports with other ports or cetz anchor points. This allows for nicer wire routing.
dstadelm added 8 commits 2026-10-22 00:54:55 +02:00
CeTZ 0.5.2 requires 3D coordinate vectors (x, y, z) for raw
coordinate tuples passed to coordinate.resolve(). Update internal
wire computations (dodge, guided) to use 3-element tuples, fix
.last() to .at(1) for y-component access on resolved coordinates,
and add a normalize-coord utility that automatically pads user-
provided 2D points (x, y) to (x, y, 0) so users do not need to
specify the z dimension.
Groups now accept ports/ports-margins like blocks. Port name labels
default to outside the group border (outside-port-names: true) so they
don't overlap child elements; set to false for block-style inside
labels.
Replaces the hard-coded 2pt padding used when placing port name labels.
Configurable per element via port-name-padding on elmt (forwarded by
block and group), defaulting to 2pt to preserve existing layout.
Add an optional pentagon shape for block and group ports, configured via
the element-level `port-shape`, `port-kind` and `port-size` parameters.
Individual ports can override them with `shape`, `kind`, `size`,
`stroke` and `fill`. Clock ports with a pentagon shape drop the clock
triangle and default to a gray fill.

Wires attach to the outer end of the pentagon by default. With the new
`shell` parameter on `element.elmt` they attach to the inner tip
instead.

Each port is exposed as a CeTZ group with a `default` anchor plus the
cardinal sub-anchors `.east`, `.west`, `.north` and `.south` on the
pentagon's bounding box, so wires can attach to any face. For
non-pentagon ports the sub-anchors collapse to the default attach point,
and the bare `<elmt-id>-port-<port-id>` anchor resolves as before.

Add the `port-shape` and `port-shape-attach` examples and the
`gallery/test_port_shape` gallery entry.
Add `port-names-outside` to draw port name labels outside the block
border. It defaults to `auto`, which follows the new `shell` setting.

Add `shell` to `block` so it can act as a container, as an alternative
to `group`. Placing elements into such a block lets them be aligned to
the ports of the outer block. A shell block draws its port names outside
and, through the existing `wire-inside` behaviour, attaches wires to the
inner tip of pentagon ports. Child elements can be passed as a
positional body argument.

Add the `port-names-outside` and `shell` examples.
Extend the port `align-with` field to accept references to ports of
other elements, in addition to the existing local-port form:

  - "<local-id>"                    → same-element port (unchanged)
  - (element: "<id>", port: "<id>") → cross-element reference
  - "<raw-anchor>"                  → arbitrary CeTZ anchor name

Cross-element alignment is implemented via CeTZ perpendicular
projection (`|-`) so the port sits on this element's side line while
sharing the remote port's y (east/west) or x (north/south) coordinate.
Local resolution still validates matching axis and detects cycles;
external refs skip axis validation (remote side unknown at eval time)
and require the target element to be drawn first.

Also enrich port-related panic messages with the element id and port
context to make offending figures easier to locate, and add a manual
example (`examples.align-with-ports`) demonstrating both local and
cross-element alignment.
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git fetch -u https://git.kb28.ch/dstadelm/circuiteria feat/align-with:dstadelm-feat/align-with
git checkout dstadelm-feat/align-with
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