+page.replace_html :sidebar_title, 'Export'
+page.replace_html :sidebar_content, :partial => 'start'
+page << <<EOJ
+ var vectors;
+ var box;
+
+ function startExport() {
+ vectors = new OpenLayers.Layer.Vector("Vector Layer", {
+ displayInLayerSwitcher: false
+ });
+ map.addLayer(vectors);
+
+ box = new OpenLayers.Control.DrawFeature(vectors, OpenLayers.Handler.RegularPolygon, {
+ handlerOptions: {
+ keyMask: OpenLayers.Handler.MOD_CTRL,
+ sides: 4,
+ snapAngle: 90,
+ irregular: true,
+ persist: true,
+ callbacks: { done: boxComplete }
+ }
+ });
+ map.addControl(box);
+
+ box.activate();
+
+ map.events.register("moveend", map, mapMoved);
+
+ openSidebar({ onclose: stopExport });
+
+ updateRegion(map.getExtent());
+
+ if (map.baseLayer.name == "Mapnik") {
+ $("format_mapnik").checked = true;
+ } else if (map.baseLayer.name == "Osmarender") {
+ $("format_osmarender").checked = true;
+ }
+
+ formatChanged();
+
+ $("viewanchor").className = "";
+ $("exportanchor").className = "active";
+ }
+
+ function stopExport() {
+ $("viewanchor").className = "active";
+ $("exportanchor").className = "";
+
+ map.events.unregister("moveend", map, mapMoved);
+ box.handler.clear();
+ map.removeLayer(vectors);
+ }
+
+ function formatChanged() {
+ if ($("format_osm").checked) {
+ $("export_osm").style.display = "inline";
+ } else {
+ $("export_osm").style.display = "none";
+ }
+
+ if ($("format_mapnik").checked) {
+ $("mapnik_scale").value = roundScale(map.getScale());
+ $("export_mapnik").style.display = "inline";
+ } else {
+ $("export_mapnik").style.display = "none";
+ }
+
+ if ($("format_osmarender").checked) {
+ var zoom = Math.min(map.getZoom(), maxOsmarenderZoom());
+
+ $("osmarender_zoom").options.selectedIndex = zoom - 4;
+ $("export_osmarender").style.display = "inline";
+ } else {
+ $("export_osmarender").style.display = "none";
+ }
+ }
+
+ $("format_osm").onclick = formatChanged;
+ $("format_mapnik").onclick = formatChanged;
+ $("format_osmarender").onclick = formatChanged;
+
+ function boundsChanged() {
+ var epsg4326 = new OpenLayers.Projection("EPSG:4326");
+ var bounds = new OpenLayers.Bounds($("minlon").value,
+ $("minlat").value,
+ $("maxlon").value,
+ $("maxlat").value);
+
+ bounds.transform(epsg4326, map.getProjectionObject());
+
+ map.events.unregister("moveend", map, mapMoved);
+ map.zoomToExtent(bounds);
+
+ box.handler.clear();
+ box.handler.feature = new OpenLayers.Feature.Vector(bounds.toGeometry());
+ box.handler.layer.addFeatures([box.handler.feature], [box.handler.style]);
+ box.handler.layer.drawFeature(box.handler.feature, box.handler.style);
+ }
+
+ $("maxlat").onchange = boundsChanged;
+ $("minlon").onchange = boundsChanged;
+ $("maxlon").onchange = boundsChanged;
+ $("minlat").onchange = boundsChanged;
+
+ function mapMoved() {
+ updateRegion(map.getExtent());
+ }
+
+ function boxComplete(box) {
+ map.events.unregister("moveend", map, mapMoved);
+ updateRegion(box.getBounds());
+ }
+
+ function updateRegion(bounds) {
+ var epsg4326 = new OpenLayers.Projection("EPSG:4326");
+ var decimals = Math.pow(10, Math.floor(map.getZoom() / 3));
+
+ bounds.transform(map.getProjectionObject(), epsg4326);
+
+ $("minlon").value = Math.round(bounds.left * decimals) / decimals;
+ $("minlat").value = Math.round(bounds.bottom * decimals) / decimals;
+ $("maxlon").value = Math.round(bounds.right * decimals) / decimals;
+ $("maxlat").value = Math.round(bounds.top * decimals) / decimals;
+
+ if (bounds.getWidth() * bounds.getHeight() > 0.25) {
+ $("format_osm").disabled = true;
+ $("format_osm").checked = false;
+
+ formatChanged();
+ } else {
+ $("format_osm").disabled = false;
+ }
+
+ var max_zoom = maxOsmarenderZoom();
+ var max_scale = maxMapnikScale();
+
+ $("max_scale").innerHTML = roundScale(max_scale);
+
+ for (var o = 0; o < $("osmarender_zoom").options.length; o++) {
+ var option = $("osmarender_zoom").options[o];
+
+ if (option.value > max_zoom) {
+ option.disabled = true;
+ } else {
+ option.disabled = false;
+ }
+ }
+
+ if ($("osmarender_zoom").options.selectedIndex + 4 > max_zoom) {
+ $("osmarender_zoom").options.selectedIndex = max_zoom - 4;
+ }
+ }
+
+ function maxMapnikScale() {
+ var bounds = new OpenLayers.Bounds($("minlon").value, $("minlat").value, $("maxlon").value, $("maxlat").value);
+ var epsg4326 = new OpenLayers.Projection("EPSG:4326");
+ var epsg900913 = new OpenLayers.Projection("EPSG:900913");
+
+ bounds.transform(epsg4326, epsg900913);
+
+ return Math.floor(Math.sqrt(bounds.getWidth() * bounds.getHeight() / 0.3136));
+ }
+
+ function maxOsmarenderZoom() {
+ var bounds = new OpenLayers.Bounds($("minlon").value, $("minlat").value, $("maxlon").value, $("maxlat").value);
+ var xzoom = Math.LOG2E * Math.log(2000 * 1.40625 / bounds.getWidth());
+ var ymin = bounds.bottom * Math.PI / 180;
+ var ymax = bounds.top * Math.PI / 180;
+ var yzoom = Math.LOG2E * (Math.log(2000 * 2 * Math.PI) - Math.log(Math.log((Math.tan(ymax) + 1 / Math.cos(ymax)) / (Math.tan(ymin) + 1 / Math.cos(ymin)))))
+
+ return Math.floor(Math.min(xzoom, yzoom));
+ }
+
+ function roundScale(scale) {
+ var precision = 5 * Math.pow(10, Math.floor(Math.LOG10E * Math.log(scale)) - 2);
+
+ return precision * Math.ceil(scale / precision);
+ }
+
+ function validateScale() {
+ if ($("mapnik_scale").value < maxMapnikScale()) {
+ $("export_commit").disabled = true;
+ } else {
+ $("export_commit").disabled = false;
+ }
+ }
+
+ $("mapnik_scale").onchange = validateScale;
+
+ startExport();
+EOJ
projects / rails.git / commitdiff