OpenLayers测量距离和面积

时间：2019-07-12 14:21:33 阅读：654 评论：0 收藏：0 [点我收藏+]
标签：order graph nts max square open rop basic util
<!DOCTYPE html>
<html>
  <head>
    <title>测量距离和面积</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <link rel="stylesheet" href="./OpenLayers-2.12/theme/default/style.css" type="text/css" />
    <link rel="stylesheet" href="./css/style.css" type="text/css">
    <style type="text/css">
        #controlToggle li {
            list-style: none;
        }
        p {
            width: 512px;
        }
        #options {
            position: relative;
            width: 512px;
        }
        #output {
            float: right;
        }
        /* avoid pink tiles */
        .olImageLoadError {
            background-color: transparent !important;
        }
    </style>
    <script src="./OpenLayers-2.12/lib/OpenLayers.js"></script>
    <script type="text/javascript">
        var map, measureControls;
        function init(){
            map = new OpenLayers.Map(‘map‘);     
            var wmsLayer = new OpenLayers.Layer.WMS( "OpenLayers WMS", 
                "http://vmap0.tiles.osgeo.org/wms/vmap0?", {layers: ‘basic‘}); 
            map.addLayers([wmsLayer]);
            map.addControl(new OpenLayers.Control.LayerSwitcher());
            map.addControl(new OpenLayers.Control.MousePosition());     
            // style the sketch fancy
            var sketchSymbolizers = {
                "Point": {
                    pointRadius: 4,
                    graphicName: "square",
                    fillColor: "white",
                    fillOpacity: 1,
                    strokeWidth: 1,
                    strokeOpacity: 1,
                    strokeColor: "#333333"
                },
                "Line": {
                    strokeWidth: 3,
                    strokeOpacity: 1,
                    strokeColor: "#666666",
                    strokeDashstyle: "dash"
                },
                "Polygon": {
                    strokeWidth: 2,
                    strokeOpacity: 1,
                    strokeColor: "#666666",
                    fillColor: "white",
                    fillOpacity: 0.3
                }
            };
            var style = new OpenLayers.Style();
            style.addRules([
                new OpenLayers.Rule({symbolizer: sketchSymbolizers})
            ]);
            var styleMap = new OpenLayers.StyleMap({"default": style});
            
            // allow testing of specific renderers via "?renderer=Canvas", etc
            var renderer = OpenLayers.Util.getParameters(window.location.href).renderer;
            renderer = (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers;

            measureControls = {
                line: new OpenLayers.Control.Measure(
                    OpenLayers.Handler.Path, {
                        persist: true,
                        handlerOptions: {
                            layerOptions: {
                                renderers: renderer,
                                styleMap: styleMap
                            }
                        }
                    }
                ),
                polygon: new OpenLayers.Control.Measure(
                    OpenLayers.Handler.Polygon, {
                        persist: true,
                        handlerOptions: {
                            layerOptions: {
                                renderers: renderer,
                                styleMap: styleMap
                            }
                        }
                    }
                )
            };
            
            var control;
            for(var key in measureControls) {
                control = measureControls[key];
                control.events.on({
                    "measure": handleMeasurements,
                    "measurepartial": handleMeasurements
                });
                map.addControl(control);
            }
            
            map.setCenter(new OpenLayers.LonLat(0, 0), 3);
            
            document.getElementById(‘noneToggle‘).checked = true;
        }
        
        function handleMeasurements(event) {
            var geometry = event.geometry;
            var units = event.units;
            var order = event.order;
            var measure = event.measure;
            var element = document.getElementById(‘output‘);
            var out = "";
            if(order == 1) {
                out += "测量距离: " + measure.toFixed(3) + " " + units;
            } else {
                out += "测量面积: " + measure.toFixed(3) + " " + units + "<sup>2</" + "sup>";
            }
            element.innerHTML = out;
        }

        function toggleControl(element) {
            for(key in measureControls) {
                var control = measureControls[key];
                if(element.value == key && element.checked) {
                    control.activate();
                } else {
                    control.deactivate();
                }
            }
        }
        
    </script>
  </head>
  <body onload="init()">
    <div id="map" class="smallmap"></div>
    <div id="options">
        <div id="output">
        </div>
        <ul id="controlToggle">
            <li>
                <input type="radio" name="type" value="none" id="noneToggle" onclick="toggleControl(this);" checked="checked" />
                <label for="noneToggle">导航</label>
            </li>
            <li>
                <input type="radio" name="type" value="line" id="lineToggle" onclick="toggleControl(this);" />
                <label for="lineToggle">测量距离</label>
            </li>
            <li>
                <input type="radio" name="type" value="polygon" id="polygonToggle" onclick="toggleControl(this);" />
                <label for="polygonToggle">测量面积</label>
            </li>
        </ul>
    </div>
  </body>
</html>
OpenLayers测量距离和面积
标签：order graph nts max square open rop basic util
原文地址：https://www.cnblogs.com/Jeely/p/11175702.html
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