1 page.replace_html :sidebar_title, 'Export'
2 page.replace_html :sidebar_content, :partial => 'start'
7 function startExport() {
8 vectors = new OpenLayers.Layer.Vector("Vector Layer", {
9 displayInLayerSwitcher: false
11 map.addLayer(vectors);
13 box = new OpenLayers.Control.DrawFeature(vectors, OpenLayers.Handler.RegularPolygon, {
15 keyMask: OpenLayers.Handler.MOD_CTRL,
20 callbacks: { done: boxComplete }
27 map.events.register("moveend", map, mapMoved);
29 openSidebar({ onclose: stopExport });
31 updateRegion(map.getExtent());
33 if (map.baseLayer.name == "Mapnik") {
34 $("format_mapnik").checked = true;
35 } else if (map.baseLayer.name == "Osmarender") {
36 $("format_osmarender").checked = true;
41 $("viewanchor").className = "";
42 $("exportanchor").className = "active";
45 function stopExport() {
46 $("viewanchor").className = "active";
47 $("exportanchor").className = "";
49 map.events.unregister("moveend", map, mapMoved);
51 map.removeLayer(vectors);
54 function formatChanged() {
55 if ($("format_osm").checked) {
56 $("export_osm").style.display = "inline";
58 $("export_osm").style.display = "none";
61 if ($("format_mapnik").checked) {
62 $("mapnik_scale").value = roundScale(map.getScale());
63 $("export_mapnik").style.display = "inline";
65 $("export_mapnik").style.display = "none";
68 if ($("format_osmarender").checked) {
69 var zoom = Math.min(map.getZoom(), maxOsmarenderZoom());
71 $("osmarender_zoom").options.selectedIndex = zoom - 4;
72 $("export_osmarender").style.display = "inline";
74 $("export_osmarender").style.display = "none";
78 $("format_osm").onclick = formatChanged;
79 $("format_mapnik").onclick = formatChanged;
80 $("format_osmarender").onclick = formatChanged;
82 function boundsChanged() {
83 var epsg4326 = new OpenLayers.Projection("EPSG:4326");
84 var bounds = new OpenLayers.Bounds($("minlon").value,
89 bounds.transform(epsg4326, map.getProjectionObject());
91 map.events.unregister("moveend", map, mapMoved);
92 map.zoomToExtent(bounds);
95 box.handler.feature = new OpenLayers.Feature.Vector(bounds.toGeometry());
96 box.handler.layer.addFeatures([box.handler.feature], [box.handler.style]);
97 box.handler.layer.drawFeature(box.handler.feature, box.handler.style);
100 $("maxlat").onchange = boundsChanged;
101 $("minlon").onchange = boundsChanged;
102 $("maxlon").onchange = boundsChanged;
103 $("minlat").onchange = boundsChanged;
105 function mapMoved() {
106 updateRegion(map.getExtent());
109 function boxComplete(box) {
110 map.events.unregister("moveend", map, mapMoved);
111 updateRegion(box.getBounds());
114 function updateRegion(bounds) {
115 var epsg4326 = new OpenLayers.Projection("EPSG:4326");
116 var decimals = Math.pow(10, Math.floor(map.getZoom() / 3));
118 bounds.transform(map.getProjectionObject(), epsg4326);
120 $("minlon").value = Math.round(bounds.left * decimals) / decimals;
121 $("minlat").value = Math.round(bounds.bottom * decimals) / decimals;
122 $("maxlon").value = Math.round(bounds.right * decimals) / decimals;
123 $("maxlat").value = Math.round(bounds.top * decimals) / decimals;
125 if (bounds.getWidth() * bounds.getHeight() > 0.25) {
126 $("format_osm").disabled = true;
127 $("format_osm").checked = false;
131 $("format_osm").disabled = false;
134 var max_zoom = maxOsmarenderZoom();
135 var max_scale = maxMapnikScale();
137 $("max_scale").innerHTML = roundScale(max_scale);
139 for (var o = 0; o < $("osmarender_zoom").options.length; o++) {
140 var option = $("osmarender_zoom").options[o];
142 if (option.value > max_zoom) {
143 option.disabled = true;
145 option.disabled = false;
149 if ($("osmarender_zoom").options.selectedIndex + 4 > max_zoom) {
150 $("osmarender_zoom").options.selectedIndex = max_zoom - 4;
154 function maxMapnikScale() {
155 var bounds = new OpenLayers.Bounds($("minlon").value, $("minlat").value, $("maxlon").value, $("maxlat").value);
156 var epsg4326 = new OpenLayers.Projection("EPSG:4326");
157 var epsg900913 = new OpenLayers.Projection("EPSG:900913");
159 bounds.transform(epsg4326, epsg900913);
161 return Math.floor(Math.sqrt(bounds.getWidth() * bounds.getHeight() / 0.3136));
164 function maxOsmarenderZoom() {
165 var bounds = new OpenLayers.Bounds($("minlon").value, $("minlat").value, $("maxlon").value, $("maxlat").value);
166 var xzoom = Math.LOG2E * Math.log(2000 * 1.40625 / bounds.getWidth());
167 var ymin = bounds.bottom * Math.PI / 180;
168 var ymax = bounds.top * Math.PI / 180;
169 var yzoom = Math.LOG2E * (Math.log(2000 * 2 * Math.PI) - Math.log(Math.log((Math.tan(ymax) + 1 / Math.cos(ymax)) / (Math.tan(ymin) + 1 / Math.cos(ymin)))))
171 return Math.floor(Math.min(xzoom, yzoom));
174 function roundScale(scale) {
175 var precision = 5 * Math.pow(10, Math.floor(Math.LOG10E * Math.log(scale)) - 2);
177 return precision * Math.ceil(scale / precision);
180 function validateScale() {
181 if ($("mapnik_scale").value < maxMapnikScale()) {
182 $("export_commit").disabled = true;
184 $("export_commit").disabled = false;
188 $("mapnik_scale").onchange = validateScale;