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Calculate scale in export

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This commit is contained in:
John Firebaugh 2012-10-12 15:14:06 -07:00
parent 800f014486
commit d5841403c4
1 changed files with 11 additions and 1 deletions
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12
app/assets/javascripts/index/export.js
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@ -61,6 +61,16 @@ $(document).ready(function () {
L.latLng($("#maxlat").val(), $("#maxlon").val()));
}
function getScale() {
var bounds = map.getBounds(),
centerLat = bounds.getCenter().lat,
halfWorldMeters = 6378137 * Math.PI * Math.cos(centerLat * Math.PI / 180),
meters = halfWorldMeters * (bounds.getNorthEast().lng - bounds.getSouthWest().lng) / 180,
pixelsPerMeter = map.getSize().x / meters,
metersPerPixel = 1 / (92 * 39.3701);
return Math.round(1 / (pixelsPerMeter * metersPerPixel));
}
function getMercatorBounds() {
var bounds = getBounds();
return L.bounds(L.CRS.EPSG3857.project(bounds.getSouthWest()),
@ -241,7 +251,7 @@ $(document).ready(function () {
}
if ($("#format_mapnik").prop("checked")) {
// $("#mapnik_scale").val(roundScale(map.getScale()));
$("#mapnik_scale").val(getScale());
$("#export_mapnik").show();
mapnikSizeChanged();