5667311cba
git-svn-id: http://svn.openlayers.org/trunk/openlayers@5458 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
179 lines
5.8 KiB
HTML
179 lines
5.8 KiB
HTML
<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>Geometry Intersections</title>
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<style type="text/css">
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html, body {
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margin: 0;
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padding: 1em;
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font: 0.9em Verdana, Arial, sans serif;
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}
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input, select, textarea {
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font: 0.9em Verdana, Arial, sans-serif;
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}
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h2 {
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margin-top: 0.75em;
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font-size: 1.6em;
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}
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#leftcol {
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position: absolute;
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top: 0;
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left: 1em;
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padding: 0;
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width: 455px;
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}
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#map {
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width: 450px;
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height: 225px;
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border: 1px solid #ccc;
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}
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#input {
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width: 450px;
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}
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#text {
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font-size: 0.85em;
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margin: 1em 0 1em 0;
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width: 100%;
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height: 10em;
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}
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#info {
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position: relative;
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padding: 2em 0;
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margin-left: 470px;
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}
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#features {
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font-size: 0.8em;
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width: 100%;
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height: 200px;
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}
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#intersections {
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font-size: 0.8em;
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width: 100%;
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height: 200px;
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}
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p {
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margin: 0;
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padding: 0.75em 0 0.75em 0;
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}
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</style>
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<script src="../lib/Firebug/firebug.js"></script>
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<script src="../lib/OpenLayers.js"></script>
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<script type="text/javascript">
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var map, vectors, geojson;
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function init(){
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map = new OpenLayers.Map('map');
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vectors = new OpenLayers.Layer.Vector(
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"Vector Layer",
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{isBaseLayer: true}
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);
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map.addLayers([vectors]);
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map.addControl(new OpenLayers.Control.MousePosition());
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var panel = new OpenLayers.Control.EditingToolbar(vectors);
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map.addControl(panel);
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geojson = new OpenLayers.Format.GeoJSON();
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map.setCenter(new OpenLayers.LonLat(0, 0), 1);
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}
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function serialize() {
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var str = geojson.write(vectors.features, true);
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document.getElementById('features').value = str;
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}
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function deserialize() {
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var element = document.getElementById('text');
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var features = geojson.read(element.value);
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var bounds;
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if(features) {
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if(features.constructor != Array) {
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features = [features];
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}
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for(var i=0; i<features.length; ++i) {
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if (!bounds) {
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bounds = features[i].geometry.getBounds();
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} else {
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bounds.extend(features[i].geometry.getBounds());
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}
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}
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vectors.addFeatures(features);
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map.zoomToExtent(bounds);
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var plural = (features.length > 1) ? 's' : '';
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element.value = features.length + ' feature' + plural + ' added'
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} else {
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element.value = 'Bad input';
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}
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}
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function intersect() {
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var features = vectors.features;
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var feat1, feat2, intersects12, intersects21;
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var parts = [];
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// reset attributes
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for(var i=0; i<features.length; ++i) {
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features[i].attributes.intersectsWith = [];
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}
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for(var i=0; i<features.length-1; ++i) {
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feat1 = features[i];
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for(var j=i+1; j<features.length; ++j) {
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feat2 = features[j];
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intersects12 = feat1.geometry.intersects(feat2.geometry);
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if(intersects12) {
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feat1.attributes.intersectsWith.push("f" + j);
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parts.push("f" + i + " intersects f" + j + "\n");
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}
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intersects21 = feat2.geometry.intersects(feat1.geometry);
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if(intersects21) {
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feat2.attributes.intersectsWith.push("f" + i);
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parts.push("f" + j + " intersects f" + i + "\n");
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}
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if(intersects12 != intersects21) {
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parts.push("trouble with " + i + " and " + j + "\n");
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}
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}
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}
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if(parts.length > 0) {
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document.getElementById("intersections").value = parts.join("");
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} else {
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document.getElementById("intersections").value = "no intersections";
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}
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}
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// preload images
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(function() {
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var roots = ["draw_point", "draw_line", "draw_polygon", "pan"];
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var onImages = [];
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var offImages = [];
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for(var i=0; i<roots.length; ++i) {
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onImages[i] = new Image();
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onImages[i].src = "../theme/default/img/" + roots[i] + "_on.png";
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offImages[i] = new Image();
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offImages[i].src = "../theme/default/img/" + roots[i] + "_on.png";
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}
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})();
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</script>
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</head>
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<body onload="init()">
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<div id="leftcol">
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<h2>OpenLayers Geometry Intersection Example</h2>
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<div id="map"></div>
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<div id="input">
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<textarea id="text"></textarea>
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<input type="button" value="add feature" onclick="deserialize();" />
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<span id="selected"></span>
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</div>
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</div>
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<div id="info">
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Features
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<input type="button" value="refresh" onclick="serialize();" /><br />
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<textarea id="features"></textarea>
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Intersections
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<input type="button" value="intersect all" onclick="intersect();" /><br />
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<textarea id="intersections"></textarea>
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</div>
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</body>
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</html>
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