app/assets/javascripts/index/export.js

   1 function initializeExport(map) {
   2   if (window.location.pathname == "/export") {
   3     startExport();
   4   }
   5
   6   function startExport() {
   7     var locationFilter = new L.LocationFilter({
   8       enableButton: false,
   9       adjustButton: false
  10     }).addTo(map);
  11
  12     update();
  13
  14     locationFilter.on("change", update);
  15
  16     map.on("moveend", update);
  17
  18     $("#maxlat,#minlon,#maxlon,#minlat").change(boundsChanged);
  19
  20     $("#drag_box").click(enableFilter);
  21
  22     setBounds(map.getBounds());
  23
  24     $("#sidebar").one("closed", function () {
  25       map.removeLayer(locationFilter);
  26       map.off("moveend", update);
  27       locationFilter.off("change", update);
  28     });
  29
  30     function getBounds() {
  31       return L.latLngBounds(L.latLng($("#minlat").val(), $("#minlon").val()),
  32                             L.latLng($("#maxlat").val(), $("#maxlon").val()));
  33     }
  34
  35     function boundsChanged() {
  36       var bounds = getBounds();
  37
  38       map.fitBounds(bounds);
  39       locationFilter.setBounds(bounds);
  40
  41       enableFilter();
  42       validateControls();
  43     }
  44
  45     function enableFilter() {
  46       if (!locationFilter.getBounds().isValid()) {
  47         locationFilter.setBounds(map.getBounds().pad(-0.2));
  48       }
  49
  50       $("#drag_box").hide();
  51       locationFilter.enable();
  52     }
  53
  54     function update() {
  55       setBounds(locationFilter.isEnabled() ? locationFilter.getBounds() : map.getBounds());
  56       validateControls();
  57     }
  58
  59     function setBounds(bounds) {
  60       var precision = zoomPrecision(map.getZoom());
  61       $("#minlon").val(bounds.getWest().toFixed(precision));
  62       $("#minlat").val(bounds.getSouth().toFixed(precision));
  63       $("#maxlon").val(bounds.getEast().toFixed(precision));
  64       $("#maxlat").val(bounds.getNorth().toFixed(precision));
  65     }
  66
  67     function validateControls() {
  68       $("#export_osm_too_large").toggle(getBounds().getSize() > OSM.MAX_REQUEST_AREA);
  69     }
  70   }
  71 }