我正在尝试创建一个带有已定义中心的圆圈,并在其上放置一个图标标记.如果我使用图像而不是OpenLayers.Geometry.Polygon.createRegularPolygon,代码工作正常.我无法解决它.
在这里你找到我的代码：
<html>
<head>
<title>OpenLayers Example</title>
<script src="http://www.openlayers.org/api/OpenLayers.js"></script>
</head>
<body>
<div id="mapdiv"></div>
<script>
map = new OpenLayers.Map("mapdiv");
map.addLayer(new OpenLayers.Layer.OSM());
epsg4326 = new OpenLayers.Projection("EPSG:4326"); //WGS 1984 projection
projectTo = map.getProjectionObject(); //The map projection (Spherical Mercator)
var lonLat = new OpenLayers.LonLat( -0.1279688,51.5077286 ).transform(epsg4326,projectTo);
var zoom=6;
map.setCenter (lonLat,zoom);
var mycircle = OpenLayers.Geometry.Polygon.createRegularPolygon(
new OpenLayers.Geometry.Point( lonLat ),1,30
);
var featurecircle = new OpenLayers.Feature.Vector(mycircle);
var vectorLayer = new OpenLayers.Layer.Vector("Overlay");
// Define markers as "features" of the vector layer:
vectorLayer.addFeatures(featurecircle);
var feature = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point( -0.1244324,51.5006728 ).transform(epsg4326,projectTo),{description:'info'},{externalGraphic: 'img/marker.png',graphicHeight: 25,graphicWidth: 21,graphicXOffset:-12,graphicYOffset:-25 }
);
vectorLayer.addFeatures(feature);
map.addLayer(vectorLayer);
</script>
</body>
</html>
提前感谢任何提示.
解决方法
OpenLayers.Geometry.Point构造函数接受x,y而不是lonlat obj.当你创建圆圈时,新的OpenLayers.Geometry.Point(lonLat)应该是新的OpenLayers.Geometry.Point(lonLat.lon,lonLat.lat);
这应该更好：
map = new OpenLayers.Map("mapdiv");
map.addLayer(new OpenLayers.Layer.OSM());
epsg4326 = new OpenLayers.Projection("EPSG:4326"); //WGS 1984 projection
projectTo = map.getProjectionObject(); //The map projection (Spherical Mercator)
var lonLat = new OpenLayers.LonLat(-0.1279688,51.5077286).transform(epsg4326,projectTo);
var zoom = 6;
map.setCenter(lonLat,zoom);
var vectorLayer = new OpenLayers.Layer.Vector("Overlay");
var point = new OpenLayers.Geometry.Point(lonLat.lon,lonLat.lat);
var mycircle = OpenLayers.Geometry.Polygon.createRegularPolygon
(
point,50000,40,0
);
var featurecircle = new OpenLayers.Feature.Vector(mycircle);
var featurePoint = new OpenLayers.Feature.Vector(
point,{ description: 'info' },{ externalGraphic: 'img/marker.png',graphicXOffset: -12,graphicYOffset: -25 }
);
vectorLayer.addFeatures([featurePoint,featurecircle]);
map.addLayer(vectorLayer);
