26 lines
1.4 KiB
HTML
26 lines
1.4 KiB
HTML
---
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layout: example.html
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title: Draw and Modify Geodesic Circles
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shortdesc: Example of using Draw and Modify interactions for geodesic circles.
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docs: >
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Example of using the `ol/interaction/Draw` interaction with a custom geometry function together with the `ol/interaction/Modify` interaction
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to draw and modify geodesic circles (a `ol/geom/Polygon#circular` polygon representing a circle on the surface of the Earth's sphere).
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The polygon is placed in a `ol/geom/GeometryCollection` together with a `ol/geom/Point` which allows the Modify interaction to adjust the
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circle center as well as the radius. Custom style functions ensure the correct final geometry is displayed throughout.
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`ol/geom/Circle` projected (planar) geometries can also be drawn and modified. The difference between geodesic and projected circles can be
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seen when their centers are moved between northern and southern latitudes in the Web Mercator projection.
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The `ol/interaction/Snap` interaction can be used to create concentric circles.
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tags: "draw, edit, modify, vector, circle, sphere, geodesic"
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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="Point">Point</option>
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<option value="LineString">LineString</option>
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<option value="Polygon">Polygon</option>
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<option value="Circle">Circle Geometry</option>
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<option value="Geodesic" selected>Geodesic Circle</option>
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</select>
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</form>
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