22 lines
789 B
HTML
22 lines
789 B
HTML
---
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layout: example.html
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title: Tracing around a polygon
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shortdesc: Using the draw interaction to trace around features.
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docs: >
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The draw interaction has a <code>trace</code> option to enable tracing
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around existing features. This example uses the <code>traceSource</code> option
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to trace features from one source and add them to another source. The first click
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on an edge of the target feature will start tracing. The second click on the edge
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will stop tracing.
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tags: "draw, trace, vector, snap, topology"
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---
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<div id="map" class="map"></div>
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<form>
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<label for="type">Geometry type </label>
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<select id="type">
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<option value="Polygon">Polygon</option>
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<option value="LineString">LineString</option>
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<option value="None">None</option>
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</select>
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</form>
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