openlaysers measure

目前很多都是使用比较早的版本。
复制都可以直接运行。

<!DOCTYPE html>
<html>
  <head>
    <title>Measure</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/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://openlayers.org/en/v5.3.0/build/ol.js" type="text/javascript"></script>
   
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js"></script>

    <style>
      .tooltip {
        position: relative;
        background: rgba(0, 0, 0, 0.5);
        border-radius: 4px;
        color: white;
        padding: 4px 8px;
        opacity: 0.7;
        white-space: nowrap;
      }
      .tooltip-measure {
        opacity: 1;
        font-weight: bold;
      }
      .tooltip-static {
        background-color: #ffcc33;
        color: black;
        border: 1px solid white;
      }
      .tooltip-measure:before,
      .tooltip-static:before {
        border-top: 6px solid rgba(0, 0, 0, 0.5);
        border-right: 6px solid transparent;
        border-left: 6px solid transparent;
        content: "";
        position: absolute;
        bottom: -6px;
        margin-left: -7px;
        left: 50%;
      }
      .tooltip-static:before {
        border-top-color: #ffcc33;
      }    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <form class="form-inline">
      <label>Measurement type &nbsp;</label>
      <select id="type">
        <option value="length">Length (LineString)</option>
        <option value="area">Area (Polygon)</option>
      </select>
    </form>
    <script>


      var raster = new ol.layer.Tile({
        source: new ol.source.OSM()
      });

      var source = new ol.source.Vector();

      var vector = new ol.layer.Vector({
        source: source,
        style: new ol.style.Style({
          fill: new ol.style.Fill({
            color: 'rgba(255, 255, 255, 0.2)'
          }),
          stroke: new ol.style.Stroke({
            color: '#ffcc33',
            width: 2
          }),
          image: new ol.style.Circle({
            radius: 7,
            fill: new ol.style.Fill({
              color: '#ffcc33'
            })
          })
        })
      });


      /**
       * Currently drawn feature.
       * @type {module:ol/Feature~Feature}
       */
      var sketch;


      /**
       * The help tooltip element.
       * @type {Element}
       */
      var helpTooltipElement;


      /**
       * Overlay to show the help messages.
       * @type {module:ol/Overlay}
       */
      var helpTooltip;


      /**
       * The measure tooltip element.
       * @type {Element}
       */
      var measureTooltipElement;


      /**
       * Overlay to show the measurement.
       * @type {module:ol/Overlay}
       */
      var measureTooltip;


      /**
       * Message to show when the user is drawing a polygon.
       * @type {string}
       */
      var continuePolygonMsg = 'Click to continue drawing the polygon';


      /**
       * Message to show when the user is drawing a line.
       * @type {string}
       */
      var continueLineMsg = 'Click to continue drawing the line';


      /**
       * Handle pointer move.
       * @param {module:ol/MapBrowserEvent~MapBrowserEvent} evt The event.
       */
      var pointerMoveHandler = function(evt) {
        if (evt.dragging) {
          return;
        }
        /** @type {string} */
        var helpMsg = 'Click to start drawing';

        if (sketch) {
          var geom = (sketch.getGeometry());
          if (geom instanceof ol.geom.Polygon) {
            helpMsg = continuePolygonMsg;
          } else if (geom instanceof ol.geom.LineString) {
            helpMsg = continueLineMsg;
          }
        }

        helpTooltipElement.innerHTML = helpMsg;
        helpTooltip.setPosition(evt.coordinate);

        helpTooltipElement.classList.remove('hidden');
      };


      var map = new ol.Map({
        layers: [raster, vector],
        target: 'map',
        view: new ol.View({
          center: [-11000000, 4600000],
          zoom: 15
        })
      });

      map.on('pointermove', pointerMoveHandler);

      map.getViewport().addEventListener('mouseout', function() {
        helpTooltipElement.classList.toggle('hidden');
      });

      var typeSelect = document.getElementById('type');

      var draw; // global so we can remove it later


      /**
       * Format length output.
       * @param {module:ol/geom/LineString~LineString} line The line.
       * @return {string} The formatted length.
       */
      var formatLength = function(line) {
        var length = ol.sphere.getLength(line);
        var output;
        if (length > 100) {
          output = (Math.round(length / 1000 * 100) / 100) +
              ' ' + 'km';
        } else {
          output = (Math.round(length * 100) / 100) +
              ' ' + 'm';
        }
        return output;
      };


      /**
       * Format area output.
       * @param {module:ol/geom/Polygon~Polygon} polygon The polygon.
       * @return {string} Formatted area.
       */
      var formatArea = function(polygon) {
        var area = ol.sphere.getArea(polygon);
        var output;
        if (area > 10000) {
          output = (Math.round(area / 1000000 * 100) / 100) +
              ' ' + 'km2';
        } else {
          output = (Math.round(area * 100) / 100) +
              ' ' + 'm2';
        }
        return output;
      };

      function addInteraction() {
        var type = (typeSelect.value == 'area' ? 'Polygon' : 'LineString');
        draw = new ol.interaction.Draw({
          source: source,
          type: type,
          style: new ol.style.Style({
            fill: new ol.style.Fill({
              color: 'rgba(255, 255, 255, 0.2)'
            }),
            stroke: new ol.style.Stroke({
              color: 'rgba(0, 0, 0, 0.5)',
              lineDash: [10, 10],
              width: 2
            }),
            image: new ol.style.Circle({
              radius: 5,
              stroke: new ol.style.Stroke({
                color: 'rgba(0, 0, 0, 0.7)'
              }),
              fill: new ol.style.Fill({
                color: 'rgba(255, 255, 255, 0.2)'
              })
            })
          })
        });
        map.addInteraction(draw);

        createMeasureTooltip();
        createHelpTooltip();

        var listener;
        draw.on('drawstart',
          function(evt) {
            // set sketch
            sketch = evt.feature;

            /** @type {module:ol/coordinate~Coordinate|undefined} */
            var tooltipCoord = evt.coordinate;

            listener = sketch.getGeometry().on('change', function(evt) {
              var geom = evt.target;
              var output;
              if (geom instanceof ol.geom.Polygon) {
                output = formatArea(geom);
                tooltipCoord = geom.getInteriorPoint().getCoordinates();
              } else if (geom instanceof ol.geom.LineString) {
                output = formatLength(geom);
                tooltipCoord = geom.getLastCoordinate();
              }
              measureTooltipElement.innerHTML = output;
              measureTooltip.setPosition(tooltipCoord);
            });
          }, this);

        draw.on('drawend',
          function() {
            measureTooltipElement.className = 'tooltip tooltip-static';
            measureTooltip.setOffset([0, -7]);
            // unset sketch
            sketch = null;
            // unset tooltip so that a new one can be created
            measureTooltipElement = null;
            createMeasureTooltip();
            ol.Observable(listener);
          }, this);
      }


      /**
       * Creates a new help tooltip
       */
      function createHelpTooltip() {
        if (helpTooltipElement) {
          helpTooltipElement.parentNode.removeChild(helpTooltipElement);
        }
        helpTooltipElement = document.createElement('div');
        helpTooltipElement.className = 'tooltip hidden';
        helpTooltip = new ol.Overlay({
          element: helpTooltipElement,
          offset: [15, 0],
          positioning: 'center-left'
        });
        map.addOverlay(helpTooltip);
      }


      /**
       * Creates a new measure tooltip
       */
      function createMeasureTooltip() {
        if (measureTooltipElement) {
          measureTooltipElement.parentNode.removeChild(measureTooltipElement);
        }
        measureTooltipElement = document.createElement('div');
        measureTooltipElement.className = 'tooltip tooltip-measure';
        measureTooltip = new ol.Overlay({
          element: measureTooltipElement,
          offset: [0, -15],
          positioning: 'bottom-center'
        });
        map.addOverlay(measureTooltip);
      }


      /**
       * Let user change the geometry type.
       */
      typeSelect.onchange = function() {
        map.removeInteraction(draw);
        addInteraction();
      };

      addInteraction();
    </script>
  </body>
</html>






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