HiNC-2025-win-desktop-Deploy/App/wwwroot/HiAPI-docsite/anatomy/widget/mat4d-control.html

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        <article data-uid="Anatomy-Mat4dControl">
          <h1 id="mat4dcontrol-component">Mat4dControl Component</h1>

<p>Mat4dControl edits and displays a 4x4 transform matrix. It is an embedded widget with no route and
no Control-Tree node of its own, reached only through the editor that hosts it.</p>
<h2 id="key-model">Key Model</h2>
<p>The persisted model is <a class="xref" href="../../api/Hi.Geom.Mat4d.html">Mat4d</a>, exposed over <code>/api/Mat4d</code> by <code>Widget/Mat4dController.cs</code>.</p>
<p>The widget's own model is a plain array of sixteen numbers, exported as <code>type Mat4</code> from
<code>wwwroot-src/src/components/widgets/Mat4Input.vue</code>. The layout is column-major, matching the backend
Mat4d: cell (row, col) resolves to index <code>col * 4 + row</code>, so indices 0 to 3 are the first column and
12 to 15 the translation column. <code>wwwroot-src/src/api/transformer.ts</code> states the same column-major
contract on the wire. A model shorter than sixteen numbers, or not an array at all, is padded out
with zeros before display, and a longer one is truncated to sixteen.</p>
<p>The widget carries no key and calls no endpoint. Its host,
<code>wwwroot-src/src/components/topo/StaticFreeformEditor.vue</code>, binds it with <code>v-model</code> and persists
each change through <code>updateStaticFreeformMat</code> from <code>wwwroot-src/src/api/transformer.ts</code>, which posts
the whole sixteen-number array to <code>/api/StaticFreeform/Update</code>; <code>Mech/Topo/StaticFreeformController.cs</code>
rejects a payload that is not exactly sixteen elements.</p>
<p>The props are <code>modelValue</code>, <code>disable</code>, <code>readonly</code>, <code>identity</code> (on by default) and <code>invert</code> (off by
default), and the emits are <code>update:modelValue</code>, <code>identity</code> and <code>invert</code>. <code>disable</code> both disables
the cells and dims the whole block.</p>
<h2 id="layout">Layout</h2>
<ul>
<li>Mat4dControl
<ul>
<li><code>Matrix Grid</code> — four rows of four numeric cells, each cell right-aligned</li>
<li><code>Identity Button</code> — present when the identity flag is set, which is the default</li>
<li><code>Invert Button</code> — present only when the invert flag is set</li>
</ul>
</li>
</ul>
<p>The cells and both buttons are inactive while the control is disabled or readonly.</p>
<h2 id="feature">Feature</h2>
<h3 id="single-input-mode">Single input mode</h3>
<p>The grid of sixteen cells is the only editing surface, and each cell shows the full precision of its
number with no rounding for display.</p>
<h3 id="matrix-operations">Matrix operations</h3>
<ul>
<li>Identity — the button raises an <code>identity</code> event and writes nothing itself; the host supplies the
matrix. StaticFreeformEditor pushes its own identity constant through <code>updateStaticFreeformMat</code>.</li>
<li>Invert — the button raises an <code>invert</code> event and computes nothing itself. StaticFreeformEditor
calls <code>invertStaticFreeformMat</code>, which posts to <code>/api/StaticFreeform/InvertMat</code> and feeds the
sixteen numbers that come back into the model.</li>
</ul>
<h3 id="commit-and-special-values">Commit and special values</h3>
<p>Each cell commits on blur or Enter, and the widget emits the entire sixteen-number array rather than
a single index. An unparseable cell reverts to its previous value, an empty cell becomes 0, and a
cell whose parsed value is unchanged emits nothing. Formatting and parsing are local to the
component: Infinity and -Infinity are shown and parsed as literal text, while NaN and a missing cell
both display as 0, so NaN is not round-tripped.</p>
<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>
<ul>
<li><code>wwwroot-src/src/components/widgets/Mat4Input.vue</code> — the widget itself: the column-major
sixteen-cell grid, the Identity and Invert buttons, and the local format, parse and commit helpers</li>
<li><code>wwwroot-src/src/components/topo/StaticFreeformEditor.vue</code> — the host, and the full binding
contract in one place: <code>v-model</code>, the two button flags, <code>@update:model-value</code>, <code>@identity</code>, <code>@invert</code></li>
<li><code>wwwroot-src/src/api/transformer.ts</code> — <code>updateStaticFreeformMat</code> and <code>invertStaticFreeformMat</code></li>
<li><code>Mech/Topo/StaticFreeformController.cs</code> — the backend behind those two endpoints: Update takes a
sixteen-element array, InvertMat returns the inverted sixteen numbers</li>
<li><code>Widget/Mat4dController.cs</code> — the <code>/api/Mat4d</code> REST surface: New, NewWithValue, Get, Update,
UpdateAt, ParseAndUpdate, SetIdentity, Transpose and Inverse. The SPA reaches none of them; the
widget's host persists through the StaticFreeform endpoints instead.</li>
<li><code>wwwroot-src/src/i18n/en/widgets.ts</code> — the Invert label and both button tooltips under <code>widgets.matInput</code></li>
</ul>
<h2 id="see-also">See Also</h2>
<ul>
<li><a class="xref" href="vec3d-control.html">Vec3dControl Component</a> — the sibling numeric-geometry editor, and the one a reader usually wants next</li>
<li><a class="xref" href="../conventions/numeric-io-utilities.html">Numeric Input/Output</a> — why NaN and the infinities are text on the wire, and why NaN does not survive this grid</li>
</ul>

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