Adding a snapping agent for snapping geometry components to existing components while editing. r=ahocevar (closes #954)
git-svn-id: http://svn.openlayers.org/trunk/openlayers@8951 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
Tim Schaub
226
examples/snapping.html
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226
examples/snapping.html
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>Snapping</title>
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<link rel="stylesheet" href="../theme/default/style.css" type="text/css" />
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<link rel="stylesheet" href="style.css" type="text/css" />
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<style type="text/css">
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.olControlEditingToolbar .olControlModifyFeatureItemInactive {
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background-position: -1px 0px ;
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}
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.olControlEditingToolbar .olControlModifyFeatureItemActive {
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background-position: -1px -23px ;
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}
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table {
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padding: 1em 0 1em;
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}
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td {
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padding: 0.5em 1em;
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border: 1px solid #ddd;
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}
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tr.head td {
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text-align: center;
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font-weight: bold;
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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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OpenLayers.Feature.Vector.style['default']['strokeWidth'] = '2';
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function init() {
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initMap();
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initUI();
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}
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var map, draw, modify, snap, point, line, poly;
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function initMap() {
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map = new OpenLayers.Map('map');
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// create three vector layers
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poly = new OpenLayers.Layer.Vector("polygons", {
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strategies: [new OpenLayers.Strategy.Fixed()],
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protocol: new OpenLayers.Protocol.HTTP({
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url: "data/poly.json",
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format: new OpenLayers.Format.GeoJSON()
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}),
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isBaseLayer: true
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});
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line = new OpenLayers.Layer.Vector("lines", {
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strategies: [new OpenLayers.Strategy.Fixed()],
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protocol: new OpenLayers.Protocol.HTTP({
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url: "data/line.json",
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format: new OpenLayers.Format.GeoJSON()
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})
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});
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point = new OpenLayers.Layer.Vector("points", {
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strategies: [new OpenLayers.Strategy.Fixed()],
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protocol: new OpenLayers.Protocol.HTTP({
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url: "data/point.json",
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format: new OpenLayers.Format.GeoJSON()
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})
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});
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map.addLayers([poly, line, point]);
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// configure the snapping agent
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snap = new OpenLayers.Control.Snapping({
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layer: poly,
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targets: [point, line, poly],
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greedy: false
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});
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snap.activate();
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// add some editing tools to a panel
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var panel = new OpenLayers.Control.Panel({
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displayClass: "olControlEditingToolbar"
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});
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draw = new OpenLayers.Control.DrawFeature(
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poly, OpenLayers.Handler.Polygon,
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{displayClass: "olControlDrawFeaturePoint"}
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);
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modify = new OpenLayers.Control.ModifyFeature(
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poly, {displayClass: "olControlModifyFeature"}
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);
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panel.addControls([
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new OpenLayers.Control.Navigation(),
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draw, modify
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]);
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map.addControl(panel);
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// give the map a location
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map.setCenter(new OpenLayers.LonLat(0, 0), 1);
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}
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/**
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* Add behavior to page elements. This basically lets us set snapping
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* target properties with the checkboxes and text inputs. The checkboxes
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* toggle the target node, vertex, or edge (boolean) values. The
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* text inputs set the nodeTolerance, vertexTolerance, or edgeTolerance
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* property values.
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*/
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function initUI() {
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var check = $("snapping");
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check.checked = true;
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check.onclick = function() {
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if(check.checked) {
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snap.activate();
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} else {
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snap.deactivate();
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}
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};
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var sel = $("editable");
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sel.value = "poly";
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sel.onchange = function() {
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updateEditable(sel.value);
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}
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var target, type, tog, tol;
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var types = ["node", "vertex", "edge"];
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for(var i=0; i<snap.targets.length; ++i) {
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target = snap.targets[i];
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for(var j=0; j<types.length; ++j) {
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type = types[j];
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tog = $(i + "_" + type);
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tog.checked = target[type];
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tog.onclick = (function(tog, type, target) {
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return function() {target[type] = tog.checked;}
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})(tog, type, target);
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tol = $(i + "_" + type + "Tolerance");
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tol.value = target[type + "Tolerance"];
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tol.onchange = (function(tol, type, target) {
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return function() {
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target[type + "Tolerance"] = Number(tol.value) || 0;
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}
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})(tol, type, target);
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}
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}
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}
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// this function allows the editable layer to be changed
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// for the snapping control, this amounts to calling setLayer
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function updateEditable(name) {
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layer = window[name];
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// update the editable layer for the snapping control (nice)
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snap.setLayer(layer);
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// update the editable layer for the modify control (ugly)
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var modActive = modify.active;
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if(modActive) {
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modify.deactivate();
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}
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modify.layer = layer;
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modify.selectControl.layer = layer;
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modify.selectControl.handlers.feature.layer = layer;
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modify.dragControl.layer = layer;
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modify.dragControl.handlers.drag.layer = layer;
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modify.dragControl.handlers.feature.layer = layer;
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if(modActive) {
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modify.activate();
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}
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// update the editable layer for the draw control (very ugly)
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var drawActive = draw.active;
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if(drawActive) {
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draw.deactivate();
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}
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draw.layer = layer;
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var handler = ({
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point: OpenLayers.Handler.Point,
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line: OpenLayers.Handler.Path,
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poly: OpenLayers.Handler.Polygon
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})[name];
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draw.handler = new handler(draw, draw.callbacks, draw.handlerOptions);
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if(drawActive) {
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draw.activate();
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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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<h1 id="title">Snapping Example</h1>
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<div id="shortdesc">A demonstration snapping while editing vector features.</div>
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<div id="map" class="smallmap"></div>
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<br/>
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<label for="editable">Editable Layer:</label>
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<select id="editable" name="editable">
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<option value="poly">polygons</option>
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<option value="line">lines</option>
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<option value="point">points</option>
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</select>
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<label for="snapping">Enable Snapping</label>
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<input type="checkbox" name="snapping" id="snapping" checked="checked" />
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<table>
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<tbody>
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<tr class="head">
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<td>targets</td><td>node</td><td>vertex</td><td>edge</td>
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</tr>
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<tr>
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<td>points</td>
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<td><input type="checkbox" id="0_node" /><input id="0_nodeTolerance" type="text" size="3" /></td>
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<td><input type="checkbox" id="0_vertex" /><input id="0_vertexTolerance" type="text" size="3" /></td>
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<td><input type="checkbox" id="0_edge" /><input id="0_edgeTolerance" type="text" size="3" /></td>
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</tr>
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<tr>
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<td>lines</td>
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<td><input type="checkbox" id="1_node" /><input id="1_nodeTolerance" type="text" size="3" /></td>
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<td><input type="checkbox" id="1_vertex" /><input id="1_vertexTolerance" type="text" size="3" /></td>
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<td><input type="checkbox" id="1_edge" /><input id="1_edgeTolerance" type="text" size="3" /></td>
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</tr>
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<tr>
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<td>polygons</td>
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<td><input type="checkbox" id="2_node" /><input id="2_nodeTolerance" type="text" size="3" /></td>
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<td><input type="checkbox" id="2_vertex" /><input id="2_vertexTolerance" type="text" size="3" /></td>
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<td><input type="checkbox" id="2_edge" /><input id="2_edgeTolerance" type="text" size="3" /></td>
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</tr>
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</tbody>
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</table>
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<p>Though all snapping types are shown here for all target layers, not all are sensible.
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Points don't have edges, for example.</p>
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</body>
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</html>
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