OpenLayers测量距离和面积
<!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>
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