在我的网页上，用户可以绘制一个多边形，然后对其进行修改。但是，我只允许用户拖放绘制的角，而不是在修改多边形时将新点添加到多边形中。在下面的示例中，我创建了一个具有四个角的多边形，并希望在修改过程中保持四个角（仅拖动角）。我认为我们应该condition在modify函数中使用，但不确定如何找出单击多边形的角或边之间的区别。<!DOCTYPE html><html> <head> <title>Draw Features</title> <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" type="text/css"> <script src="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/v5.3.0/build/ol.js"></script> </head> <body> <div id="map" class="map"></div> <script> var raster = new ol.layer.Tile({ source: new ol.source.OSM() }); var source = new ol.source.Vector({wrapX: false}); var offset = 1000000; var ply = new ol.geom.Polygon([[ [-11000000 - offset, 4600000 - offset], [-11000000 + offset, 4600000 - offset], [-11000000 + offset, 4600000 + offset], [-11000000 - offset, 4600000 + offset]]]); var feature = new ol.Feature(ply); source.addFeatures([feature]); var vector = new ol.layer.Vector({ source: source }); var map = new ol.Map({ layers: [raster, vector], target: 'map', view: new ol.View({ center: [-11000000, 4600000], zoom: 4 }) }); var modify = new ol.interaction.Modify({source: source}) map.addInteraction(modify); </script> </body></html>
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