我如何迭代多边形？

Question

我正在使用OpenLayers

读取多边形

var features = format.read(strGML);

这是GML字符串结构

<gml:featureMember xmlns:gml="http://www.opengis.net/gml xsi:schemaLocation="http://www.opengis.net/gml http://schemas.opengis.net/gml/3.1.1/profiles/gmlsfProfile/1.0.0/gmlsf.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 <feature:feature xmlns:feature="http://example.com/feature">
      <feature:geometry>
           <gml:Polygon>
                 <gml:exterior>
                       <gml:LinearRing>
                             <gml:posList>591674.39 5022898.05 545682.5 4722908.1 571701.44 5322909.29 651691.25 5022904.6 591674.39 5022898.05
                             </gml:posList>
                        </gml:LinearRing>
                 </gml:exterior>
           </gml:Polygon>
      </feature:geometry>
 </feature:feature>

阅读后（有效）我​​需要迭代这个多边形的每个点并读取坐标。我尝试了各种尝试，但是无法让它发挥作用。这样做的正确方法是什么？

Answer 1

无论如何，我找到了解决方案：

var newPoints = [];
var feature = features[0];
var points = feature.geometry.getVertices();
for (var i=0; i<points.length; i++) {
    var lon = points[i].x;
    var lat = points[i].y;
    var point = new OpenLayers.Geometry.Point(lon, lat);
    // do something with Points
    newPoints.push(point);
}