有什么办法可以看到几个地标何时重叠在同一位置上? [英] Is there any way to see when several placemarks superimposed on the same positions?

问题描述

有什么办法可以看到几个地标何时重叠在同一位置?

Is there any way to see when several placemarks superimposed on the same positions?

如下图所示，Google Earth，我们可以看到它. 谢谢你.

As the figure below, Google Earth, we have a way to see it. Thank you.

推荐答案

是的，您可以发挥自己的想象力并创建自定义群集.参见此 plunker演示，我使用以下函数来创建类似以下的集群:

Yes, you can use your imagination and make a custom cluster. See this plunker demo, I use the following function to create a cluster like:

var displayOverlapping = function(pixel) {

  var f = map.forEachFeatureAtPixel(pixel, function(ft, l) {
      return ft;
  });
  if (f && f.get('type') == 'cluster') {

    if(f.get('expanded') === true) return;

    var geom = f.getGeometry(),
        coord = geom.getCoordinates(),
        px = map.getPixelFromCoordinate(coord),
        extent = [coord[0], coord[1], coord[0], coord[1]],
        ar_features = [];

    sourceFeatures.forEachFeatureInExtent(extent, function(ft){
        if(ft.get('type') == 'click') ar_features.push(ft);
    });
    var angle = (100 / ar_features.length) * 3.6;

    f.set('expanded', true);
    f.setStyle(style_cluster_hover);
    multiLineString.setCoordinates([]);

    ar_features.forEach(function(row, index){
      var angle2 = index * angle,
          px_end = rotate(px[0], px[1], angle2, 30),
          cd_end = map.getCoordinateFromPixel(px_end);

      multiLineString.appendLineString(
          new ol.geom.LineString([coord, cd_end])
      );

      row.setGeometry(new ol.geom.Point(cd_end));
      row.setStyle(style_parada);
    });
  }
};

该功能在pointermove事件上触发.

这篇关于有什么办法可以看到几个地标何时重叠在同一位置上?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！