110 lines
3.1 KiB
JavaScript
110 lines
3.1 KiB
JavaScript
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/*
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################################################################################
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ox.geo.js
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requires
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jquery.js
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ox.js
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################################################################################
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*/
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(function() {
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var earthRadius = 6378137,
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earthCircumference = 2 * Math.PI * earthRadius
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latMax = Ox.deg(Math.atan(Ox.sinh(Math.PI))),
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latMin = -latMax;
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/*
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map = {
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width: window.innerWidth,
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height: window.innerHeight,
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margin: 16
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};
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*/
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Ox.getLatLng = (function() {
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/*
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returns {lat, lng} for a given (x, y)
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*/
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function getLatLng(xy) {
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return (xy - 0.5) * 2 * Math.PI;
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}
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return function(x, y) {
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return {
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lat: -Ox.deg(Math.atan(Ox.sinh(getLatLng(y)))),
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lng: Ox.deg(getLatLng(x))
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};
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};
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})();
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Ox.getPlacemarks = (function() {
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/*
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Ox.getPlacemarks(name, callback)
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Ox.getPlacemarks(lat, lng, callback)
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*/
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var cache = {};
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return function() {
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// $.getScript("http://maps.google.com/maps/api/js?sensor=false", function() {
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// getPlacemarks(args);
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// });
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// var args = arguments;
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var reverse = typeof arguments[0] == "number",
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query = $.extend({
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language: "en"
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}, !reverse ? {
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address: arguments[0]
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} : {
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latLng: new google.maps.LatLng(arguments[0], arguments[1])
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}),
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id = JSON.stringify(query),
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callback = arguments[arguments.length - 1],
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geocoder = new google.maps.Geocoder();
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if (cache[id]) {
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callback(cache[id]);
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} else {
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geocoder.geocode(query, function(results, status) {
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var data = {
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results: results,
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status: status
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};
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cache[id] = data;
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callback(data);
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});
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}
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};
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})();
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Ox.getXY = (function() {
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/*
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returns {x, y} for a given (lat, lng), between 0 and 1
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*/
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function getXY(xy) {
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return (xy / (2 * Math.PI) + 0.5);
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}
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return function(lat, lng) {
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return {
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x: getXY(Ox.rad(lng)),
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y: getXY(Ox.asinh(Math.tan(Ox.rad(-lat))))
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};
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};
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})();
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/*
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Ox.getZ = function(placemark, map) {
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// returns zoom level at which placemark is fully included
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map.width -= 2 * map.margin;
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map.height -= 2 * map.margin;
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var northEast = getXY(placemark.northEast),
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southWest = getXY(placemark.southWest),
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width = (northEast.x - southWest.x),
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height = (northEast.y - southWest.y),
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return parseInt(Ox.log(width / height > map.width / map.height ?
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map.width / width : map.height / height, 2));
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};
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*/
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})();
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