ÿþ/*

* convert lat/long in degrees to radians, for handling input values

*

*   this is very flexible on formats, allowing signed decimal degrees (numeric or text), or

*   deg-min-sec suffixed by compass direction (NSEW). A variety of separators are accepted 

*   (eg 3º 37' 09"W) or fixed-width format without separators (eg 0033709W). Seconds and minutes

*   may be omitted. Minimal validation is done.

*/

LatLong.llToRad = function (brng) {

    if (!isNaN(brng)) return brng * Math.PI / 180;  // signed decimal degrees without NSEW



    brng = brng.replace(/[\s]*$/, '');               // strip trailing whitespace

    var dir = brng.slice(-1).toUpperCase();         // compass dir'n

    if (!/[NSEW]/.test(dir)) return NaN;            // check for correct compass direction

    brng = brng.slice(0, -1);                        // and lose it off the end

    var dms = brng.split(/[\s:,°º2 \'3 \"]/)          // check for separators indicating d/m/s

    switch (dms.length) {                           // convert to decimal degrees...

        case 3:                                       // interpret 3-part result as d/m/s

            var deg = dms[0] / 1 + dms[1] / 60 + dms[2] / 3600; break;

        case 2:                                       // interpret 2-part result as d/m

            var deg = dms[0] / 1 + dms[1] / 60; break;

        case 1:                                       // non-separated format dddmmss

            if (/[NS]/.test(dir)) brng = '0' + brng;    // - normalise N/S to 3-digit degrees

            var deg = brng.slice(0, 3) / 1 + brng.slice(3, 5) / 60 + brng.slice(5) / 3600; break;

        default: return NaN;

    }

    if (/[WS]/.test(dir)) deg = -deg;               // take west and south as -ve

    return deg * Math.PI / 180;                     // then convert to radians

}







/*

* LatLong constructor:

*/

function LatLong(degLat, degLong) {

    this.lat = LatLong.llToRad(degLat);

    this.lon = LatLong.llToRad(degLong);

}





/*

* Calculate distance (in km) between two points specified by latitude/longitude with Haversine formula

*

*/

function distancebetween(p1, p2) {

    var R = 6371; // earth's mean radius in km

    var dLat = p2.lat - p1.lat;

    var dLong = p2.lon - p1.lon;



    var a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +

          Math.cos(p1.lat) * Math.cos(p2.lat) * Math.sin(dLong / 2) * Math.sin(dLong / 2);

    var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));

    var d = R * c;



    return d;

}





var map;        // added 



function createMapNoMarkers(dblLatitude, dblLongitude, lngZoom, dlat, dlong) {

    // creates a map with no markers 

    if (GBrowserIsCompatible()) {

        map = new GMap2(document.getElementById("map"));

        map.addControl(new GSmallMapControl());

        map.addControl(new GMapTypeControl());

        map.addControl(new GScaleControl());

        map.setCenter(new GLatLng(dblLatitude, dblLongitude), lngZoom);

        var hpos = new LatLong(dlat, dlong)

    }

    else {

        alert("Sorry, your browser is not compatible")

    }

}



// Creates a marker at the given point with the given number label

function createMarker(point, text, lat, lng, dlat, dlong) {

    var marker = new GMarker(point);

    GEvent.addListener(marker, "click", function () {

        var thispos = new LatLong(lat, lng)

        var hpos = new LatLong(dlat, dlong)

        var db = distancebetween(thispos, hpos)

        var dbmiles = db * 0.621371192

        var km = Math.round(db * 10) / 10

        var miles = Math.round(dbmiles * 10) / 10

        document.getElementById("HMousePos").innerHTML = text

        if (db > 0) {

            //document.getElementById("MousePos").innerHTML+= " (" + miles + " mi/" + km + " km from property)"

        }

    });

    GEvent.addListener(marker, "mouseover", function () {

        var thispos = new LatLong(lat, lng)

        var hpos = new LatLong(dlat, dlong)

        var db = distancebetween(thispos, hpos)

        var dbmiles = db * 0.621371192

        var km = Math.round(db * 10) / 10

        var miles = Math.round(dbmiles * 10) / 10

        document.getElementById("HMousePos").innerHTML = text

        if (db > 0) {

            //document.getElementById("MousePos").innerHTML+= " (" + miles + " mi/" + km + " km from property)"

        }

    });

    GEvent.addListener(marker, "mouseout", function () {

        document.getElementById("HMousePos").innerHTML = dest

    });

    return marker;

}





function createMainMarker(dblLatitude, dblLongitude) {

    // creates a marker on a previously created map 

    var point = new GLatLng(dblLatitude, dblLongitude);

    map.addOverlay(createMarker(point, "", dblLatitude, dblLongitude));

}



function landmark(dlat, dlong) {

    var sel = document.getElementById("landmarks")

    var lmark = sel.options[sel.selectedIndex].value



    if (lmark != "") {

        var lsplit = lmark.split("|")

        var co = lsplit[1]

        var csplit = co.split(",")

        createNewMarker(csplit[0], csplit[1], lsplit[0], dlat, dlong)

        //document.getElementById("HMousePos").innerHTML="Landmark located - hover or click to see distance from property"

    }

}



function createNewMarker(dblLatitude, dblLongitude, title, dlat, dlong) {

    // creates a marker on a previously created map 

    var point = new GLatLng(dblLatitude, dblLongitude);

    map.addOverlay(createMarker(point, title, dblLatitude, dblLongitude, dlat, dlong));

    map.setCenter(point, 14);



}