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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</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;
+ }
+ table {
+ padding: 1em 0 1em;
+ }
+ td {
+ padding: 0.5em 1em;
+ border: 1px solid #ddd;
+ }
+ 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, point, line, poly;
+ 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: "#3333aa"
+ },
+ "Line": {
+ strokeWidth: 3,
+ strokeOpacity: 1,
+ strokeColor: "#6666aa"
+ },
+ "Polygon": {
+ strokeWidth: 1,
+ strokeOpacity: 1,
+ fillColor: "#9999aa",
+ strokeColor: "#6666aa"
+ }
+ }
+ })
+ ]
+ }),
+ "select": new OpenLayers.Style(null, {
+ rules: [
+ new OpenLayers.Rule({
+ symbolizer: {
+ "Point": {
+ pointRadius: 5,
+ graphicName: "square",
+ fillColor: "white",
+ fillOpacity: 0.25,
+ strokeWidth: 2,
+ strokeOpacity: 1,
+ strokeColor: "#0000ff"
+ },
+ "Line": {
+ strokeWidth: 3,
+ strokeOpacity: 1,
+ strokeColor: "#0000ff"
+ },
+ "Polygon": {
+ strokeWidth: 2,
+ strokeOpacity: 1,
+ fillColor: "#0000ff",
+ strokeColor: "#0000ff"
+ }
+ }
+ })
+ ]
+ }),
+ "temporary": new OpenLayers.Style(null, {
+ rules: [
+ new OpenLayers.Rule({
+ symbolizer: {
+ "Point": {
+ graphicName: "square",
+ pointRadius: 5,
+ fillColor: "white",
+ fillOpacity: 0.25,
+ strokeWidth: 2,
+ strokeColor: "#0000ff"
+ },
+ "Line": {
+ strokeWidth: 3,
+ strokeOpacity: 1,
+ strokeColor: "#0000ff"
+ },
+ "Polygon": {
+ strokeWidth: 2,
+ strokeOpacity: 1,
+ strokeColor: "#0000ff",
+ fillColor: "#0000ff"
+ }
+ }
+ })
+ ]
+ })
+ });
+
+ // create three vector layers
+ poly = new OpenLayers.Layer.Vector("polygons", {
+ strategies: [new OpenLayers.Strategy.Fixed()],
+ protocol: new OpenLayers.Protocol.HTTP({
+ url: "data/poly.json",
+ format: new OpenLayers.Format.GeoJSON()
+ }),
+ styleMap: styles,
+ isBaseLayer: true
+ });
+ line = new OpenLayers.Layer.Vector("lines", {
+ strategies: [new OpenLayers.Strategy.Fixed()],
+ protocol: new OpenLayers.Protocol.HTTP({
+ url: "data/line.json",
+ format: new OpenLayers.Format.GeoJSON()
+ }),
+ styleMap: styles
+ });
+ point = new OpenLayers.Layer.Vector("points", {
+ strategies: [new OpenLayers.Strategy.Fixed()],
+ protocol: new OpenLayers.Protocol.HTTP({
+ url: "data/point.json",
+ format: new OpenLayers.Format.GeoJSON()
+ }),
+ styleMap: styles
+ });
+ map.addLayers([poly, line, point]);
+
+ // configure the snapping agent
+ snap = new OpenLayers.Control.Snapping({
+ layer: poly,
+ targets: [point, line, poly],
+ greedy: false
+ });
+ snap.activate();
+
+ // add some editing tools to a panel
+ var panel = new OpenLayers.Control.Panel({
+ displayClass: "olControlEditingToolbar"
+ });
+ draw = new OpenLayers.Control.DrawFeature(
+ poly, OpenLayers.Handler.Polygon,
+ {displayClass: "olControlDrawFeaturePoint", title: "Draw Features", handlerOptions: {holeModifier: "altKey"}}
+ );
+ modify = new OpenLayers.Control.ModifyFeature(
+ poly, {displayClass: "olControlModifyFeature", title: "Modify Features"}
+ );
+ panel.addControls([
+ new OpenLayers.Control.Navigation({title: "Navigate"}),
+ draw, modify
+ ]);
+ map.addControl(panel);
+
+ // give the map a location
+ map.setCenter(new OpenLayers.LonLat(0, 0), 1);
+ }
+
+ /**
+ * 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() {
+ var check = document.getElementById("snapping");
+ check.checked = true;
+ check.onclick = function() {
+ if(check.checked) {
+ snap.activate();
+ } else {
+ snap.deactivate();
+ }
+ };
+
+ var sel = document.getElementById("editable");
+ sel.value = "poly";
+ sel.onchange = function() {
+ updateEditable(sel.value);
+ };
+
+ var target, type, tog, tol;
+ var types = ["node", "vertex", "edge"];
+ for(var i=0; i<snap.targets.length; ++i) {
+ target = snap.targets[i];
+ for(var j=0; j<types.length; ++j) {
+ type = types[j];
+ tog = document.getElementById(i + "_" + type);
+ tog.checked = target[type];
+ tog.onclick = (function(tog, type, target) {
+ return function() {target[type] = tog.checked;}
+ })(tog, type, target);
+ tol = document.getElementById(i + "_" + 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);
+ }
+ }
+
+ }
+
+ // this function allows the editable layer to be changed
+ // for the snapping control, this amounts to calling setLayer
+ function updateEditable(name) {
+
+ layer = window[name];
+
+ // update the editable layer for the snapping control (nice)
+ snap.setLayer(layer);
+
+ // update the editable layer for the modify control (ugly)
+ var modActive = modify.active;
+ if(modActive) {
+ modify.deactivate();
+ }
+ modify.layer = layer;
+ modify.selectControl.layer = layer;
+ modify.selectControl.handlers.feature.layer = layer;
+ modify.dragControl.layer = layer;
+ modify.dragControl.handlers.drag.layer = layer;
+ modify.dragControl.handlers.feature.layer = layer;
+ if(modActive) {
+ modify.activate();
+ }
+
+ // update the editable layer for the draw control (very ugly)
+ var drawActive = draw.active;
+ if(drawActive) {
+ draw.deactivate();
+ }
+ draw.layer = layer;
+ var handler = ({
+ point: OpenLayers.Handler.Point,
+ line: OpenLayers.Handler.Path,
+ poly: OpenLayers.Handler.Polygon
+ })[name];
+ draw.handler = new handler(draw, draw.callbacks, draw.handlerOptions);
+ if(drawActive) {
+ draw.activate();
+ }
+
+ }
+
+ </script>
+ </head>
+ <body onload="init()">
+ <h1 id="title">Snapping Example</h1>
+ <div id="tags">
+ vector, feature, snapping, stylemap, advanced
+ </div>
+ <div id="shortdesc">A demonstration snapping while editing vector features.</div>
+ <div id="map" class="smallmap"></div>
+ <br>
+ <label for="editable">Editable Layer:</label>
+ <select id="editable" name="editable">
+ <option value="poly">polygons</option>
+ <option value="line">lines</option>
+ <option value="point">points</option>
+ </select>
+ <label for="snapping">Enable Snapping</label>
+ <input type="checkbox" name="snapping" id="snapping" checked="checked" />
+ <table>
+ <tbody>
+ <tr class="head">
+ <td>targets</td><td>node</td><td>vertex</td><td>edge</td>
+ </tr>
+ <tr>
+ <td>points</td>
+ <td><input type="checkbox" id="0_node" /><input id="0_nodeTolerance" type="text" size="3" /></td>
+ <td><input type="checkbox" id="0_vertex" /><input id="0_vertexTolerance" type="text" size="3" /></td>
+ <td><input type="checkbox" id="0_edge" /><input id="0_edgeTolerance" type="text" size="3" /></td>
+ </tr>
+ <tr>
+ <td>lines</td>
+ <td><input type="checkbox" id="1_node" /><input id="1_nodeTolerance" type="text" size="3" /></td>
+ <td><input type="checkbox" id="1_vertex" /><input id="1_vertexTolerance" type="text" size="3" /></td>
+ <td><input type="checkbox" id="1_edge" /><input id="1_edgeTolerance" type="text" size="3" /></td>
+ </tr>
+ <tr>
+ <td>polygons</td>
+ <td><input type="checkbox" id="2_node" /><input id="2_nodeTolerance" type="text" size="3" /></td>
+ <td><input type="checkbox" id="2_vertex" /><input id="2_vertexTolerance" type="text" size="3" /></td>
+ <td><input type="checkbox" id="2_edge" /><input id="2_edgeTolerance" type="text" size="3" /></td>
+ </tr>
+ </tbody>
+ </table>
+ <p>Though all snapping types are shown here for all target layers, not all are sensible.
+ Points don't have edges, for example.</p>
+ </body>
+</html>
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-22 19:25:48 +0000