使用openlayers动态添加GPX

时间:2018-05-27 16:47:01

标签: javascript openlayers-3

我试图通过从复选框中选择gpx文件来显示不同的路线,但矢量图层不会出现。

我使用OpenLayers网页中的示例作为指南:GPXDATADragandDrop没有结果。

Main.php

<!DOCTYPE html>
<html>
<head>
    <title>Mapa simple de OpenStreetMap con Open Layers</title>    
    <link rel="stylesheet" href="https://openlayers.org/en/v4.0.1/css/ol.css" type="text/css">
    <script src="https://openlayers.org/en/v4.0.1/build/ol.js"></script>
    <link rel="stylesheet" href="css/main.css" type="text/css">
    <script src="js/main.js"></script>
</head>
<body>
    <h1 id="maintitle">Rutas de Limpieza</h1>
    <div id="content">
        <div id="menu">
            <ul>
                <li>Mostrar Rutas</li>
                <ul>Rutas de Barredoras
                    <li><input id="r1" name="ba_r1" type="checkbox">Ruta B1</li>
                    <li><input name="ba_r2" type="checkbox">Ruta B2</li>
                    <li><input name="ba_r3" type="checkbox">Ruta B3</li>
                </ul>                    
            </ul>
            <button id="sr_btn">Mostrar Rutas Seleccionas</button>
        </div>


        <div id="map" class="map"></div>
    </div>
</body>
</html>

main.js

window.onload = function(){
var defaultStyle = {
    'Point': new ol.style.Style({
      image: new ol.style.Circle({
        fill: new ol.style.Fill({
          color: 'rgba(255,255,0,0.5)'
        }),
        radius: 5,
        stroke: new ol.style.Stroke({
          color: '#ff0',
          width: 1
        })
      })
    }),
    'LineString': new ol.style.Style({
      stroke: new ol.style.Stroke({
        color: '#f00',
        width: 3
      })
    }),
    'Polygon': new ol.style.Style({
      fill: new ol.style.Fill({
        color: 'rgba(0,255,255,0.5)'
      }),
      stroke: new ol.style.Stroke({
        color: '#0ff',
        width: 1
      })
    }),
    'MultiPoint': new ol.style.Style({
      image: new ol.style.Circle({
        fill: new ol.style.Fill({
          color: 'rgba(255,0,255,0.5)'
        }),
        radius: 5,
        stroke: new ol.style.Stroke({
          color: '#f0f',
          width: 1
        })
      })
    }),
    'MultiLineString': new ol.style.Style({
      stroke: new ol.style.Stroke({
        color: '#00f',
        width: 3
      })
    }),
    'MultiPolygon': new ol.style.Style({
      fill: new ol.style.Fill({
        color: 'rgba(25,120,255,0.5)'
      }),
      stroke: new ol.style.Stroke({
        color: '#00f',
        width: 1
      })
    })
};

var styleFunction = function(feature, resolution) {
    var featureStyleFunction = feature.getStyleFunction();
    if (featureStyleFunction) {
      return featureStyleFunction.call(feature, resolution);
    } else {
      return defaultStyle[feature.getGeometry().getType()];
    }
};

var map = new ol.Map({
    layers: [
      new ol.layer.Tile({
        source: new ol.source.OSM()
      })
    ],
    target: 'map',
    view: new ol.View({
      center: ol.proj.fromLonLat([2.5, 39.5]),
      zoom: 12
    })
});

var btn_sr = this.document.getElementById("sr_btn").addEventListener('click', function(){        
    var vector1 = new ol.layer.Vector({
        source: new ol.source.Vector({
          url: 'gpx/qq2.gpx',
          format: new ol.format.GPX()
        }),
        style: defaultStyle
    });

    map.addLayer(new ol.layer.Vector({
        renderMode: 'image',
        source: vector1,
        style: styleFunction
    }));
});
}

对于我可以从API理解的内容,map.addLayer函数应该将vector1图层放在图层集合的顶部并自动显示,但我有这样的错误:&#34;未捕获的异常:AssertionError:断言失败。有关详细信息,请参阅https://openlayers.org/en/v4.0.1/doc/errors/#41。&#34; 这意味着:期望ol.style.Style或ol.style.Style数组。

但var defaultStyle已经是一个样式数组,所以我不理解错误。

感谢。

1 个答案:

答案 0 :(得分:0)

您有2个地方可以在代码中设置样式

  • java.lang.IllegalStateException: Realm access from incorrect thread. Realm objects can only be accessed on the thread they were created.
  • style: defaultStyle

style: styleFunction正常工作(它返回基于几何类型的样式)。 相反,styleFunction无效,因为它不是&#34; ol.style.Style或ol.style.Style的数组。&#34;但它是一个对象。

要解决此问题,您可以

  • defaultStyle替换为style: defaultStyle
  • 如果您的GPX仅包含积分,则可以使用style: styleFunction
  • 如果只包含行,则可以使用style: defaultStyle['Point']