oxjs/build/js/ox.geo.js
2010-01-07 21:21:07 +01:00

110 lines
No EOL
3.1 KiB
JavaScript

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