163 lines
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163 lines
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<title>Numeric Input/Output Utilities | HiAPI-C# 2025 </title>
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<article data-uid="">
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<h1 id="numeric-inputoutput-utilities">Numeric Input/Output Utilities</h1>
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<p>Handle special numeric values (Infinity, -Infinity, NaN) in web forms to prevent JSON serialization issues between JavaScript frontend and C# backend.</p>
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<h2 id="implementation-requirements">Implementation Requirements</h2>
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<p>Your <code>numeric-utils.js</code> module should:</p>
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<ul>
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<li>Convert special values for display: Infinity → “INF”, -Infinity → “-INF”, NaN → “NaN”</li>
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<li>Parse display strings back to numeric values</li>
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<li>Format regular numbers with 4 significant digits (for standard display mode)</li>
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<li>Provide full precision output without information loss (for text mode editing)</li>
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<li>Provide Vue mixin for component integration</li>
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</ul>
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<h2 id="required-exports">Required Exports</h2>
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<ul>
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<li><code>numericToDisplay(value)</code> - Converts numeric to display string (4 significant digits)</li>
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<li><code>numericToFullPrecision(value)</code> - Converts numeric to full precision string (no information loss, for text mode)</li>
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<li><code>displayToNumeric(displayValue, defaultValue)</code> - Parses display to numeric</li>
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<li><code>NumericInputMixin</code> - Vue mixin with formatNumericDisplay, toFullPrecision, and parseNumericDisplay methods</li>
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</ul>
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<h2 id="usage-guidelines">Usage Guidelines</h2>
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<ul>
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<li>Use <code>numericToDisplay()</code> for standard input fields where formatted display is preferred</li>
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<li>Use <code>numericToFullPrecision()</code> for text mode inputs (e.g., array-like number editors) where users need to see/edit exact values without precision loss</li>
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</ul>
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<h2 id="avoiding-precision-loss">Avoiding Precision Loss</h2>
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<p>When a component has multiple numeric inputs (e.g., <a class="xref" href="../../../api/Hi.Geom.Vec3d.html">Vec3d</a> with X, Y, Z or <a class="xref" href="../../../api/Hi.Geom.Mat4d.html">Mat4d</a> with 16 elements), parsing display values back to numeric on unchanged fields will cause precision loss due to the 4-digit formatting.</p>
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<p><strong>Problem</strong>: If user only edits X, but <code>displayToNumeric()</code> is called on all fields (X, Y, Z), the unchanged Y and Z values lose precision.</p>
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<p><strong>Solution</strong>: Update only the edited field by:</p>
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<ol>
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<li>Each input field should have its own <code>@change</code> handler (e.g., <code>onXChanged</code>, <code>onYChanged</code>, <code>onZChanged</code>)</li>
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<li>Backend should provide single-element update API (e.g., <code>UpdateAt(key, index, value)</code>)</li>
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<li>Only parse and send the edited value to backend</li>
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</ol>
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<p><strong>Example</strong> (Vec3d):</p>
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<ul>
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<li>Frontend: <code>@change="onXChanged"</code> calls <code>/api/Vec3d/UpdateAt?index=0&value=...</code></li>
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<li>Backend: <code>vec3d.At(index) = value;</code></li>
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</ul>
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<p><strong>Example</strong> (Mat4d):</p>
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<ul>
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<li>Frontend: <code>@change="onCellChanged(row, col)"</code> calls <code>/api/Mat4d/UpdateAt?index=...&value=...</code></li>
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<li>Backend: <code>mat4d.m[index] = value;</code></li>
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</ul>
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<h2 id="source-code-path">Source Code Path</h2>
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<p>See <a href="../index.html">this page</a> for git repository.</p>
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<h3 id="web-page-application-source-code-path">Web Page Application Source Code Path</h3>
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<ul>
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<li>wwwroot/common/numeric-utils.js</li>
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</ul>
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