Garden Gnome Software

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<script src="js/custom.js"></script>

Code: Select all

function checkdistance() {    
	// On success execute readXML function
    navigator.geolocation.getCurrentPosition(readXML, errorPosition);
};

function readXML(position) {
	var xhttp = new XMLHttpRequest();
	xhttp.onreadystatechange = function() {
	   if (this.readyState == 4 && this.status == 200) {
		   initXML(this, position);
	   }
	};
	xhttp.open("GET", "pano.xml", true);
	xhttp.send();
};

function initXML(xml, position) {
    var panorama, panoramaid, i, xmlDoc, panolongitude, panolatitude, userlongitude, userlatitude, panodistance=[];
    xmlDoc = xml.responseXML;
    panolongitude	 = "";
	panolatitude	 = "";

	userlongitude = position.coords.longitude;
	userlatitude =  position.coords.latitude;
    panorama = xmlDoc.getElementsByTagName('panorama');
    for (i = 0; i < panorama.length; i++) { 
		userdata = xmlDoc.getElementsByTagName('userdata');
		panoramaid = panorama[i].getAttribute('id');
		panolongitude = parseFloat(userdata[i].getAttribute('longitude'));
		panolatitude = parseFloat(userdata[i].getAttribute('latitude'));
		panodistance.push([panoramaid, distance(panolongitude, panolatitude, userlongitude, userlatitude)]);
    }
	var sortedpanos = panodistance.sort(compareDistances);
	var closestpanoid = sortedpanos[0][0];
	var closestpanodistance = sortedpanos[0][1];
	pano.openNext("{" + closestpanoid + "}")
	alert("This panorama is " + Math.round(closestpanodistance * 100) / 100 + " kilometers away from you."); 
}

function compareDistances(a, b) {
    if (a[1] === b[1]) {
        return 0;
    }
    else {
        return (a[1] < b[1]) ? -1 : 1;
    }
}

if (navigator.geolocation) {    
    // Browser supports it, we're good to go!     
    } else {    
    alert('Sorry your browser doesn\'t support the Geolocation API');    
    }

function errorPosition() {                  
    alert('Sorry couldn\'t find your location');                 
    pretext.show();         
}

function distance(lon1, lat1, lon2, lat2) {
  var R = 6371; // Radius of the earth in km
  var dLat = (lat2-lat1).toRad();  // Javascript functions in radians
  var dLon = (lon2-lon1).toRad(); 
  var a = Math.sin(dLat/2) * Math.sin(dLat/2) + Math.cos(lat1.toRad()) * Math.cos(lat2.toRad()) * Math.sin(dLon/2) * Math.sin(dLon/2); 
  var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
  var d = R * c; // Distance in km
  return d;
}

/** Converts numeric degrees to radians */
if (typeof(Number.prototype.toRad) === "undefined") {
  Number.prototype.toRad = function() {
    return this * Math.PI / 180;
  }
}