OpenLayers学习笔记（六）— 拖拽叠加层overlayer

是在官网例子基础上增加的拖拽功能

GitHub:八至

作者：狐狸家的鱼

本文链接：拖拽叠加层overlayer

全部代码

<!DOCTYPE html>
<html>
  <head>
    <title>Icon Symbolizer</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v3.20.1/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <script src="https://openlayers.org/en/v3.20.1/build/ol.js"></script>
    <script src="https://code.jquery.com/jquery-2.2.3.min.js"></script>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
    <style>
      #map {
        position: relative;
      }
      #popup {
        cursor: pointer;
      }
      .popupStyle{
          position:relative;
        width:100px;
        height:100px;      
        text-align:center;
        line-height:100px;
        color:white;
        background-color:rgba(0,0,0,0.4);
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <div id="popup"><div class="popupStyle">Null Island</div></div>
    
    <script>
      var element = document.getElementById('popup');
      var iconFeature = new ol.Feature({
        geometry: new ol.geom.Point([0, 0]),
        name: 'Null Island'      });
        var lineStyle = new ol.style.Style({
          stroke: new ol.style.Stroke({ 
              color: '#ffcc33', 
              width: 3,
              lineDash:[10,10]
            })
        });
        var line = new ol.geom.LineString([0,0],[0,0]);
      var lineFeature = new ol.Feature(line);
      var iconStyle = new ol.style.Style({
        image: new ol.style.Icon(/** @type {olx.style.IconOptions} */ ({
          anchor: [0.5, 46],
          anchorXUnits: 'fraction',
          anchorYUnits: 'pixels',
          src: 'https://openlayers.org/en/v3.20.1/examples/data/icon.png'
        }))
      });

      iconFeature.setStyle(iconStyle);

      var vectorSource = new ol.source.Vector({
        features: [iconFeature,lineFeature]
      });

      var vectorLayer = new ol.layer.Vector({
        source: vectorSource,
        style:[lineStyle],
        updateWhileInteracting: true,//自动更新位置
      });

      var rasterLayer = new ol.layer.Tile({
        source: new ol.source.TileJSON({
          url: 'https://api.tiles.mapbox.com/v3/mapbox.geography-class.json?secure',
          crossOrigin: ''
        })
      });

      var map = new ol.Map({
        layers: [rasterLayer, vectorLayer],
        target: document.getElementById('map'),
        view: new ol.View({
          center: [0, 0],
          zoom: 3
        })
      });
     
      
      var popup = new ol.Overlay({
        element: element,
        positioning: 'bottom-center',
        stopEvent: false,
        dragging: false,
        offset: [0, -50]
      });
      popup.setPosition([0,0]);
      map.addOverlay(popup);

      // display popup on click
      var dragPan;
      map.getInteractions().forEach(function(interaction){
        if (interaction instanceof ol.interaction.DragPan) {
          dragPan = interaction;  
        }
      });

      element.addEventListener('mousedown', function(evt) {
        dragPan.setActive(false);
        popup.set('dragging', true);
        console.info('start dragging');
      });
      // var translateLine = new ol.interaction.Translate({
      //   //features:new ol.Collection([lineFeature])
      //   layers:new ol.Collection([popup])
      // });
      // map.addInteraction(translateLine);

      // var coord;

      // translateLine.on('translatestart',function (evt){
      //   coord = popup.getCoordinates();
      // });
      // translateLine.on('translating', function (evt) {
      //   line.setCoordinates([coord, evt.coordinate]);
      // });
      map.on('pointermove', function(evt) {
          var startPoint=iconFeature.getGeometry().getCoordinates();
        if (popup.get('dragging')) {
          var dd2=map.getPixelFromCoordinate(evt.coordinate);
          var newX=dd2[0]-0;//减去偏移量
          var newY=dd2[1]-(-50);
          var newPoint=map.getCoordinateFromPixel([newX,newY]);
          popup.setPosition(newPoint);
              lineFeature.getGeometry().setCoordinates([startPoint,evt.coordinate]);
      //   }
            
        }
      });
      map.on('pointerup', function(evt) {
        if (popup.get('dragging') === true) {
          console.info('stop dragging');
          dragPan.setActive(true);
          popup.set('dragging', false);
        }
      });
    </script>
  </body>
</html>

 

posted @ 2018-12-28 17:16  狐狸家的鱼  阅读(3634)  评论(0)  编辑  收藏  举报