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snap-split.html
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<!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>Snapping & Splitting</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">
.olControlEditingToolbar .olControlModifyFeatureItemInactive {
background-position: -1px -1px;
}
.olControlEditingToolbar .olControlModifyFeatureItemActive {
background-position: -1px -24px;
}
label.head {
font-weight: bold;
padding: 1em 0 0.1em 0;
border-bottom: 1px solid gray;
}
td {
padding: 0.25em 1em;
}
tr.head td {
text-align: center;
font-weight: bold;
}
</style>
<script src="../lib/Firebug/firebug.js"></script>
<script src="../lib/OpenLayers.js"></script>
<script type="text/javascript">
OpenLayers.Feature.Vector.style['default']['strokeWidth'] = '2';
function init() {
initMap();
initUI();
}
var map, draw, modify, snap, split, vectors;
function initMap() {
map = new OpenLayers.Map('map');
var styles = new OpenLayers.StyleMap({
"default": new OpenLayers.Style(null, {
rules: [
new OpenLayers.Rule({
symbolizer: {
"Point": {
pointRadius: 5,
graphicName: "square",
fillColor: "white",
fillOpacity: 0.25,
strokeWidth: 1,
strokeOpacity: 1,
strokeColor: "#333333"
},
"Line": {
strokeWidth: 3,
strokeOpacity: 1,
strokeColor: "#666666"
}
}
})
]
}),
"select": new OpenLayers.Style({
strokeColor: "#00ccff",
strokeWidth: 4
}),
"temporary": new OpenLayers.Style(null, {
rules: [
new OpenLayers.Rule({
symbolizer: {
"Point": {
pointRadius: 5,
graphicName: "square",
fillColor: "white",
fillOpacity: 0.25,
strokeWidth: 1,
strokeOpacity: 1,
strokeColor: "#333333"
},
"Line": {
strokeWidth: 3,
strokeOpacity: 1,
strokeColor: "#00ccff"
}
}
})
]
})
});
// 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;
// create three vector layers
vectors = new OpenLayers.Layer.Vector("Lines", {
isBaseLayer: true,
strategies: [new OpenLayers.Strategy.Fixed()],
protocol: new OpenLayers.Protocol.HTTP({
url: "data/roads.json",
format: new OpenLayers.Format.GeoJSON()
}),
styleMap: styles,
maxExtent: new OpenLayers.Bounds(
1549471.9221, 6403610.94, 1550001.32545, 6404015.8
),
renderers: renderer
});
map.addLayer(vectors);
// configure the snapping agent
snap = new OpenLayers.Control.Snapping({layer: vectors});
map.addControl(snap);
snap.activate();
// configure split agent
split = new OpenLayers.Control.Split({
layer: vectors,
source: vectors,
tolerance: 0.0001,
eventListeners: {
aftersplit: function(event) {
flashFeatures(event.features);
}
}
});
map.addControl(split);
split.activate();
// add some editing tools to a panel
var panel = new OpenLayers.Control.Panel({
displayClass: "olControlEditingToolbar"
});
draw = new OpenLayers.Control.DrawFeature(
vectors, OpenLayers.Handler.Path,
{displayClass: "olControlDrawFeaturePoint", title: "Draw Features"}
);
modify = new OpenLayers.Control.ModifyFeature(
vectors, {displayClass: "olControlModifyFeature", title: "Modify Features"}
);
panel.addControls([
new OpenLayers.Control.Navigation({title: "Navigate"}),
draw, modify
]);
map.addControl(panel);
map.addControl(new OpenLayers.Control.MousePosition());
map.zoomToMaxExtent();
}
function flashFeatures(features, index) {
if(!index) {
index = 0;
}
var current = features[index];
if(current && current.layer === vectors) {
vectors.drawFeature(features[index], "select");
}
var prev = features[index-1];
if(prev && prev.layer === vectors) {
vectors.drawFeature(prev, "default");
}
++index;
if(index <= features.length) {
window.setTimeout(function() {flashFeatures(features, index)}, 75);
}
}
/**
* Add behavior to page elements. This basically lets us set snapping
* target properties with the checkboxes and text inputs. The checkboxes
* toggle the target node, vertex, or edge (boolean) values. The
* text inputs set the nodeTolerance, vertexTolerance, or edgeTolerance
* property values.
*/
function initUI() {
// add behavior to snap elements
var snapCheck = $("snap_toggle");
snapCheck.checked = true;
snapCheck.onclick = function() {
if(snapCheck.checked) {
snap.activate();
$("snap_options").style.display = "block";
} else {
snap.deactivate();
$("snap_options").style.display = "none";
}
};
var target, type, tog, tol;
var types = ["node", "vertex", "edge"];
var target = snap.targets[0];
for(var j=0; j<types.length; ++j) {
type = types[j];
tog = $("target_" + type);
tog.checked = target[type];
tog.onclick = (function(tog, type, target) {
return function() {target[type] = tog.checked;}
})(tog, type, target);
tol = $("target_" + type + "Tolerance");
tol.value = target[type + "Tolerance"];
tol.onchange = (function(tol, type, target) {
return function() {
target[type + "Tolerance"] = Number(tol.value) || 0;
}
})(tol, type, target);
}
// add behavior to split elements
var splitCheck = $("split_toggle");
splitCheck.checked = true;
splitCheck.onclick = function() {
if(splitCheck.checked) {
split.activate();
$("split_options").style.display = "block";
} else {
split.deactivate();
$("split_options").style.display = "none";
}
};
var edgeCheck = $("edge_toggle");
edgeCheck.checked = split.edge;
edgeCheck.onclick = function() {
split.edge = edgeCheck.checked;
};
$("clear").onclick = function() {
modify.deactivate();
vectors.destroyFeatures();
};
}
</script>
</head>
<body onload="init()">
<h1 id="title">Snapping & Splitting Example</h1>
<div id="tags">
vector, feature, splitting, snapping, stylemap, advanced
</div>
<div id="shortdesc">A demonstration snapping and splitting while editing vector features.</div>
<div id="map" class="smallmap"></div>
<br>
<input type="checkbox" id="snap_toggle" />
<label for="snap_toggle" class="head">Enable Snapping</label>
<table id="snap_options">
<tbody>
<tr class="head">
<td>target</td><td>node</td><td>vertex</td><td>edge</td>
</tr>
<tr>
<td>roads</td>
<td><input type="checkbox" id="target_node" /><input id="target_nodeTolerance" type="text" size="3" /></td>
<td><input type="checkbox" id="target_vertex" /><input id="target_vertexTolerance" type="text" size="3" /></td>
<td><input type="checkbox" id="target_edge" /><input id="target_edgeTolerance" type="text" size="3" /></td>
</tr>
</tbody>
</table>
<br>
<input type="checkbox" id="split_toggle" />
<label for="split_toggle" class="head">Enable Splitting</label>
<table id="split_options">
<tbody>
<tr>
<td><label for="edge_toggle">edges split</label></td>
<td><input type="checkbox" id="edge_toggle" /></td>
</tr>
</tbody>
</table>
<br>
<button id="clear">clear</button> Clear all features.
</body>
</html>