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
185
186
187
188
189
190
191
192
193
|
<!DOCTYPE html>
<html>
<head>
<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">
<title>Geometry Intersections</title>
<link rel="stylesheet" href="../theme/default/style.css" type="text/css">
<!--[if lte IE 6]>
<link rel="stylesheet" href="../theme/default/ie6-style.css" type="text/css">
<![endif]-->
<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>
<div id="tags">
intersection, geometry
</div>
<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">
<p>Features</p>
<input type="button" value="refresh" onclick="serialize();"><br>
<textarea id="features"></textarea>
<p>Intersections</p>
<input type="button" value="intersect all" onclick="intersect();"><br>
<textarea id="intersections"></textarea>
</div>
</body>
</html>
|
