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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 | <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Snapping</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"> .olControlEditingToolbar .olControlModifyFeatureItemInactive { background-position: -1px 0px ; } .olControlEditingToolbar .olControlModifyFeatureItemActive { background-position: -1px -23px ; } 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"} ); 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 = $("snapping"); check.checked = true; check.onclick = function() { if(check.checked) { snap.activate(); } else { snap.deactivate(); } }; var sel = $("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 = $(i + "_" + type); tog.checked = target[type]; tog.onclick = (function(tog, type, target) { return function() {target[type] = tog.checked;} })(tog, type, target); tol = $(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="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> |