HiNC-2025-win-desktop-Deploy/App/wwwroot/HiAPI-docsite/anatomy/geom/transformation-geom-control.html

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        <article data-uid="Anatomy-TransformationGeomControl">
          <h1 id="transformation-geometry-control">Transformation Geometry Control</h1>

<p>A <a class="xref" href="../../api/Hi.Geom.TransformationGeom.html">TransformationGeom</a> is an inner geometry plus the transformer that places it, and the
editor is those two things side by side. It has two faces: an embedded two-card editor,
and a Control-Tree panel that shows only the status of each half and puts the editing on child
nodes.</p>
<div class="IMPORTANT">
<h5>Important</h5>
<p><strong>Choosing a kind here replaces, it does not wrap.</strong> Picking an inner geometry calls the
container-aware create endpoint, which constructs a fresh instance and discards whatever was
there. There is no operation anywhere that wraps an existing geometry into a transformation
geometry, or extracts it back out — see
<a href="geom-manage-control.html">Geometry Management Panel</a>.</p>
</div>
<h2 id="layout">Layout</h2>
<h3 id="the-embedded-editor">The embedded editor</h3>
<p>Two bordered cards, each badged with the live type behind it, over a short explanation of what a
transformer applied to a geometry means:</p>
<ul>
<li><strong>Inner Geometry</strong> (<code>.../inner-geom</code>) — the full <a href="geom-manage-control.html">Geometry Management Panel</a>,
its dropdown labelled <em>Inner geometry type</em>, over five kinds: Box3d, Cylindroid, StlFile, a nested
TransformationGeom and GeomCombination — which is what makes recursion and nesting legal — plus a
<strong>None (unset)</strong> entry.</li>
<li><strong>Inner Transformer</strong> — the
<a class="xref" href="transformer-panel.html">Transformer Select Panel</a>, mounted with no kind restriction at all, so
its own default of <strong>all seven</strong> transformer kinds applies.</li>
</ul>
<h3 id="the-control-tree-panel">The Control-Tree panel</h3>
<p>Status badges for the two halves and the same explanation, and nothing editable: the tree grows an
<strong>Inner Geometry</strong> slot and an <strong>Inner Transformer</strong> slot as children, and each of those grows its
own kind child. The registry deliberately overrides the kind → editor map here, so the two-card
editor never appears inside a tree.</p>
<h2 id="behavior">Behavior</h2>
<ul>
<li><strong>The identity transformer is the floor.</strong> The inner-transformer picker offers no null entry, and
the server installs a <code>NoTransform</code> whenever the field is null, so the slot is never unset.</li>
<li><strong>Creation is container-aware on both halves.</strong> Both go through this type's own create endpoints
rather than the generic per-kind ones, so the owning field is rebound and not merely the store
entry.</li>
<li><strong>The control does not preview.</strong> There is no viewport on it. It reports edits upward — one
event when a half is mutated, another when a half is replaced — and the hosting page's shared 3D
canvas re-renders from there.</li>
<li><strong>A null inner geometry has a deterministic key anyway.</strong> When the inner geometry is unset the
server returns no key, so the editor falls back to a derived alias; without it the picker could
never create the first geometry.</li>
</ul>
<h2 id="source-code-path">Source Code Path</h2>
<p>See <a class="xref" href="../index.html">HiNC App Anatomy</a> for git repository links.</p>
<p>HiNC-2025-webservice (Quasar CLI SPA):</p>
<ul>
<li><code>wwwroot-src/src/components/geom/TransformationGeomEditor.vue</code> — the embedded editor: the two
cards and their type badges, the two container-aware create hooks, and the fallback alias for a
null inner geometry.</li>
<li><code>wwwroot-src/src/components/controlTree/TransformationGeomTreePanel.vue</code> — the Control-Tree face:
status only.</li>
<li><code>wwwroot-src/src/components/controlTree/itemTypes.ts</code> — registers the kind against that panel with
a child builder that grows the Inner Geometry and Inner Transformer slots, and is where the
override of the kind → editor map lives.</li>
<li><code>wwwroot-src/src/components/controlTree/GeometrySlotPanel.vue</code>,
<code>wwwroot-src/src/components/controlTree/TransformerSlotPanel.vue</code> and
<code>wwwroot-src/src/components/controlTree/SoleEditorPanel.vue</code> — the two child slots' pickers and
each kind grandchild's editor.</li>
<li><code>wwwroot-src/src/components/geom/geometryEditors.ts</code> and
<code>wwwroot-src/src/components/geom/GeometryEditor.vue</code> — the kind map that reaches this editor, and
the switchboard it re-enters for its own inner geometry.</li>
<li><code>wwwroot-src/src/components/topo/TransformerSelectPanel.vue</code> and
<code>wwwroot-src/src/components/topo/transformerEditors.ts</code> — the inner-transformer picker and the
seven kinds it offers, with the labels it renders them under.</li>
<li><code>wwwroot-src/src/components/geom/GeomCombinationEditor.vue</code>,
<code>wwwroot-src/src/pages/MechBuilderPage.vue</code> and
<code>wwwroot-src/src/components/toolhouse/UpperBeamDiv.vue</code> — the three embedders of the non-tree
form.</li>
<li><code>wwwroot-src/src/api/geometry.ts</code> — the transformation-geometry DTO, the two index calls and the
two create calls.</li>
<li><code>wwwroot-src/src/api/transformer.ts</code> — the transformer kind union and the per-kind endpoints the
inner transformer's editors bind through.</li>
<li><code>wwwroot-src/src/i18n/en/geom.ts</code> and <code>wwwroot-src/src/i18n/en/tree.ts</code> — the card labels, the
explanation, and the two child-node labels.</li>
<li><code>Geom/TransformationGeomController.cs</code> — REST endpoints at <code>/api/TransformationGeom/*</code>: <code>New</code>,
<code>Get</code>, <code>IndexGeom</code>, <code>IndexTransformer</code>, <code>CreateGeom</code>, <code>CreateTransformer</code>, <code>UpdateTransformer</code>,
<code>GetGeomType</code> and <code>GetTransformerType</code>. <code>IndexGeom</code> answers empty for a null geometry, and
<code>IndexTransformer</code> is where the identity default is installed.</li>
<li><code>Geom/Box3dController.cs</code>, <code>Geom/CylindroidController.cs</code>, <code>Geom/StlFileController.cs</code> and
<code>Geom/GeomCombinationController.cs</code> — the four other inner-geometry kinds' own surfaces.</li>
<li>The seven per-kind transformer controllers under <code>Mech/Topo/</code> — reached by the inner transformer's
editors for their own reads and writes, not for creation, which this type's own endpoint owns.</li>
<li><code>Common/IndexController.cs</code> and <code>Common/IndexService.cs</code> — the type probe both pickers use, and
the store the two aliases are registered into.</li>
</ul>
<h2 id="see-also">See Also</h2>
<ul>
<li><a class="xref" href="../../technique/mechanism/transformers.html">Transformers</a></li>
<li><a href="geom-manage-control.html">Geometry Management Panel</a> — the switchboard this editor embeds for its
inner geometry, and the only place a wrap or extract exists</li>
<li><a class="xref" href="transformer-panel.html">Transformer Select Panel</a> — the inner-transformer picker and its seven
kinds</li>
</ul>

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