1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 | <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Geometry Intersections</title> <link rel="stylesheet" href="../theme/default/style.css" type="text/css" /> <link rel="stylesheet" href="style.css" type="text/css" /> <style type="text/css"> html, body { margin: 0; padding: 1em; font: 0.9em Verdana, Arial, sans serif; } input, select, textarea { font: 0.9em Verdana, Arial, sans-serif; } h2 { margin-top: 0.75em; font-size: 1.6em; } #leftcol { position: absolute; top: 0; left: 1em; padding: 0; width: 455px; } #map { width: 450px; height: 225px; border: 1px solid #ccc; } #input { width: 450px; } #text { font-size: 0.85em; margin: 1em 0 1em 0; width: 100%; height: 10em; } #info { position: relative; padding: 2em 0; margin-left: 470px; } #features { font-size: 0.8em; width: 100%; height: 200px; } #intersections { font-size: 0.8em; width: 100%; height: 200px; } p { margin: 0; padding: 0.75em 0 0.75em 0; } </style> <script src="../lib/Firebug/firebug.js"></script> <script src="../lib/OpenLayers.js"></script> <script type="text/javascript"> var map, vectors, geojson; function init(){ map = new OpenLayers.Map('map'); vectors = new OpenLayers.Layer.Vector( "Vector Layer", {isBaseLayer: true} ); map.addLayers([vectors]); map.addControl(new OpenLayers.Control.MousePosition()); var panel = new OpenLayers.Control.EditingToolbar(vectors); map.addControl(panel); geojson = new OpenLayers.Format.GeoJSON(); map.setCenter(new OpenLayers.LonLat(0, 0), 1); } function serialize() { var str = geojson.write(vectors.features, true); document.getElementById('features').value = str; } function deserialize() { var element = document.getElementById('text'); var features = geojson.read(element.value); var bounds; if(features) { if(features.constructor != Array) { features = [features]; } for(var i=0; i<features.length; ++i) { if (!bounds) { bounds = features[i].geometry.getBounds(); } else { bounds.extend(features[i].geometry.getBounds()); } } vectors.addFeatures(features); map.zoomToExtent(bounds); var plural = (features.length > 1) ? 's' : ''; element.value = features.length + ' feature' + plural + ' added' } else { element.value = 'Bad input'; } } function intersect() { var features = vectors.features; var feat1, feat2, intersects12, intersects21; var parts = []; // reset attributes for(var i=0; i<features.length; ++i) { features[i].attributes.intersectsWith = []; } for(var i=0; i<features.length-1; ++i) { feat1 = features[i]; for(var j=i+1; j<features.length; ++j) { feat2 = features[j]; intersects12 = feat1.geometry.intersects(feat2.geometry); if(intersects12) { feat1.attributes.intersectsWith.push("f" + j); parts.push("f" + i + " intersects f" + j + "\n"); } intersects21 = feat2.geometry.intersects(feat1.geometry); if(intersects21) { feat2.attributes.intersectsWith.push("f" + i); parts.push("f" + j + " intersects f" + i + "\n"); } if(intersects12 != intersects21) { parts.push("trouble with " + i + " and " + j + "\n"); } } } if(parts.length > 0) { document.getElementById("intersections").value = parts.join(""); } else { document.getElementById("intersections").value = "no intersections"; } } // preload images (function() { var roots = ["draw_point", "draw_line", "draw_polygon", "pan"]; var onImages = []; var offImages = []; for(var i=0; i<roots.length; ++i) { onImages[i] = new Image(); onImages[i].src = "../theme/default/img/" + roots[i] + "_on.png"; offImages[i] = new Image(); offImages[i].src = "../theme/default/img/" + roots[i] + "_on.png"; } })(); </script> </head> <body onload="init()"> <div id="leftcol"> <h1 id="title">OpenLayers Geometry Intersection Example</h1> <p id="shortdesc"> Use of geometry.intersects method for testing geometry intersections. </p> <div id="map" class="smallmap"></div> <div id="input"> <textarea id="text"></textarea> <input type="button" value="add feature" onclick="deserialize();" /> <span id="selected"></span> </div> </div> <div id="info"> Features <input type="button" value="refresh" onclick="serialize();" /><br /> <textarea id="features"></textarea> Intersections <input type="button" value="intersect all" onclick="intersect();" /><br /> <textarea id="intersections"></textarea> </div> </body> </html> |