openlayers画圆您可以通过ol.geom.Circle的方式，或者参考我们的官网范例https://iclient.supermap.io/examples/openlayers/editor.html#drawFeatures
筛选和判断点是否在圆内您可以通过缓冲区查询来判断https://iclient.supermap.io/examples/openlayers/editor.html#02_getFeatureByBuffer
