gnu-social/plugins/Mapstraction/js/mxn.js

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2009-11-18 13:23:13 +09:00
// Auto-load scripts
//
// specify which map providers to load by using
// <script src="mxn.js?(provider1,provider2,[module1,module2])" ...
// in your HTML
//
// for each provider mxn.provider.module.js and mxn.module.js will be loaded
// module 'core' is always loaded
//
// NOTE: if you call without providers
// <script src="mxn.js" ...
// no scripts will be loaded at all and it is then up to you to load the scripts independently
(function() {
var providers = null;
var modules = 'core';
var scriptBase;
var scripts = document.getElementsByTagName('script');
// Determine which scripts we need to load
for (var i = 0; i < scripts.length; i++) {
var match = scripts[i].src.replace(/%20/g , '').match(/^(.*?)mxn\.js(\?\(\[?(.*?)\]?\))?$/);
if (match != null) {
scriptBase = match[1];
if (match[3]) {
var settings = match[3].split(',[');
providers = settings[0].replace(']' , '');
if (settings[1]) modules += ',' + settings[1];
}
break;
}
}
if (providers == null || providers == 'none') return; // Bail out if no auto-load has been found
providers = providers.replace(/ /g, '').split(',');
modules = modules.replace(/ /g, '').split(',');
// Actually load the scripts
for (i = 0; i < modules.length; i++) {
document.write("<script type='text/javascript' src='" + scriptBase + 'mxn.' + modules[i] + '.js' + "'></script>");
for (var j = 0; j < providers.length; j++) document.write("<script type='text/javascript' src='" + scriptBase + 'mxn.' + providers[j] + '.' + modules[i] + '.js' + "'></script>");
}
})();
(function(){
// holds all our implementing functions
var apis = {};
// Our special private methods
/**
* Calls the API specific implementation of a particular method.
* @private
*/
var invoke = function(sApiId, sObjName, sFnName, oScope, args){
if(!hasImplementation(sApiId, sObjName, sFnName)) {
throw 'Method ' + sFnName + ' of object ' + sObjName + ' is not supported by API ' + sApiId + '. Are you missing a script tag?';
}
return apis[sApiId][sObjName][sFnName].apply(oScope, args);
};
/**
* Determines whether the specified API provides an implementation for the
* specified object and function name.
* @private
*/
var hasImplementation = function(sApiId, sObjName, sFnName){
if(typeof(apis[sApiId]) == 'undefined') {
throw 'API ' + sApiId + ' not loaded. Are you missing a script tag?';
}
if(typeof(apis[sApiId][sObjName]) == 'undefined') {
throw 'Object definition ' + sObjName + ' in API ' + sApiId + ' not loaded. Are you missing a script tag?';
}
return typeof(apis[sApiId][sObjName][sFnName]) == 'function';
};
/**
* @name mxn
* @namespace
*/
var mxn = window.mxn = /** @lends mxn */ {
/**
* Registers a set of provider specific implementation functions.
* @function
* @param {String} sApiId The API ID to register implementing functions for.
* @param {Object} oApiImpl An object containing the API implementation.
*/
register: function(sApiId, oApiImpl){
if(!apis.hasOwnProperty(sApiId)){
apis[sApiId] = {};
}
mxn.util.merge(apis[sApiId], oApiImpl);
},
/**
* Adds a list of named proxy methods to the prototype of a
* specified constructor function.
* @function
* @param {Function} func Constructor function to add methods to
* @param {Array} aryMethods Array of method names to create
* @param {Boolean} bWithApiArg Optional. Whether the proxy methods will use an API argument
*/
addProxyMethods: function(func, aryMethods, bWithApiArg){
for(var i = 0; i < aryMethods.length; i++) {
var sMethodName = aryMethods[i];
if(bWithApiArg){
func.prototype[sMethodName] = new Function('return this.invoker.go(\'' + sMethodName + '\', arguments, { overrideApi: true } );');
}
else {
func.prototype[sMethodName] = new Function('return this.invoker.go(\'' + sMethodName + '\', arguments);');
}
}
},
/*
checkLoad: function(funcDetails){
if(this.loaded[this.api] === false) {
var scope = this;
this.onload[this.api].push( function() { funcDetails.callee.apply(scope, funcDetails); } );
return true;
}
return false;
},
*/
/**
* Bulk add some named events to an object.
* @function
* @param {Object} oEvtSrc The event source object.
* @param {String[]} aEvtNames Event names to add.
*/
addEvents: function(oEvtSrc, aEvtNames){
for(var i = 0; i < aEvtNames.length; i++){
var sEvtName = aEvtNames[i];
if(sEvtName in oEvtSrc){
throw 'Event or method ' + sEvtName + ' already declared.';
}
oEvtSrc[sEvtName] = new mxn.Event(sEvtName, oEvtSrc);
}
}
};
/**
* Instantiates a new Event
* @constructor
* @param {String} sEvtName The name of the event.
* @param {Object} oEvtSource The source object of the event.
*/
mxn.Event = function(sEvtName, oEvtSource){
var handlers = [];
if(!sEvtName){
throw 'Event name must be provided';
}
/**
* Add a handler to the Event.
* @param {Function} fn The handler function.
* @param {Object} ctx The context of the handler function.
*/
this.addHandler = function(fn, ctx){
handlers.push({context: ctx, handler: fn});
};
/**
* Remove a handler from the Event.
* @param {Function} fn The handler function.
* @param {Object} ctx The context of the handler function.
*/
this.removeHandler = function(fn, ctx){
for(var i = 0; i < handlers.length; i++){
if(handlers[i].handler == fn && handlers[i].context == ctx){
handlers.splice(i, 1);
}
}
};
/**
* Remove all handlers from the Event.
*/
this.removeAllHandlers = function(){
handlers = [];
};
/**
* Fires the Event.
* @param {Object} oEvtArgs Event arguments object to be passed to the handlers.
*/
this.fire = function(oEvtArgs){
var args = [sEvtName, oEvtSource, oEvtArgs];
for(var i = 0; i < handlers.length; i++){
handlers[i].handler.apply(handlers[i].context, args);
}
};
};
/**
* Creates a new Invoker, a class which helps with on-the-fly
* invocation of the correct API methods.
* @constructor
* @param {Object} aobj The core object whose methods will make cals to go()
* @param {String} asClassName The name of the Mapstraction class to be invoked, normally the same name as aobj's constructor function
* @param {Function} afnApiIdGetter The function on object aobj which will return the active API ID
*/
mxn.Invoker = function(aobj, asClassName, afnApiIdGetter){
var obj = aobj;
var sClassName = asClassName;
var fnApiIdGetter = afnApiIdGetter;
var defOpts = {
overrideApi: false, // {Boolean} API ID is overridden by value in first argument
context: null, // {Object} Local vars can be passed from the body of the method to the API method within this object
fallback: null // {Function} If an API implementation doesn't exist this function is run instead
};
/**
* Invoke the API implementation of a specific method.
* @param {String} sMethodName The method name to invoke
* @param {Array} args Arguments to pass on
* @param {Object} oOptions Optional. Extra options for invocation
* @param {Boolean} oOptions.overrideApi When true the first argument is used as the API ID.
* @param {Object} oOptions.context A context object for passing extra information on to the provider implementation.
* @param {Function} oOptions.fallback A fallback function to run if the provider implementation is missing.
*/
this.go = function(sMethodName, args, oOptions){
if(typeof(oOptions) == 'undefined'){
oOptions = defOpts;
}
var sApiId = oOptions.overrideApi ? args[0] : fnApiIdGetter.apply(obj);
if(typeof(sApiId) != 'string'){
throw 'API ID not available.';
}
if(typeof(oOptions.context) != 'undefined' && oOptions.context !== null){
// make sure args is an array
args = Array.prototype.slice.apply(args);
args.push(oOptions.context);
}
if(typeof(oOptions.fallback) == 'function' && !hasImplementation(sApiId, sClassName, sMethodName)){
// we've got no implementation but have got a fallback function
return oOptions.fallback.apply(obj, args);
}
else {
return invoke(sApiId, sClassName, sMethodName, obj, args);
}
};
};
/**
* @namespace
*/
mxn.util = {
/**
* Merges properties of one object into another recursively.
* @param {Object} oRecv The object receiveing properties
* @param {Object} oGive The object donating properties
*/
merge: function(oRecv, oGive){
for (var sPropName in oGive){
if (oGive.hasOwnProperty(sPropName)) {
if(!oRecv.hasOwnProperty(sPropName)){
oRecv[sPropName] = oGive[sPropName];
}
else {
mxn.util.merge(oRecv[sPropName], oGive[sPropName]);
}
}
}
},
/**
* $m, the dollar function, elegantising getElementById()
* @return An HTML element or array of HTML elements
*/
$m: function() {
var elements = [];
for (var i = 0; i < arguments.length; i++) {
var element = arguments[i];
if (typeof(element) == 'string') {
element = document.getElementById(element);
}
if (arguments.length == 1) {
return element;
}
elements.push(element);
}
return elements;
},
/**
* loadScript is a JSON data fetcher
* @param {String} src URL to JSON file
* @param {Function} callback Callback function
*/
loadScript: function(src, callback) {
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = src;
if (callback) {
if(script.addEventListener){
script.addEventListener('load', callback, true);
}
else if(script.attachEvent){
var done = false;
script.attachEvent("onreadystatechange",function(){
if ( !done && document.readyState === "complete" ) {
done = true;
callback();
}
});
}
}
var h = document.getElementsByTagName('head')[0];
h.appendChild( script );
return;
},
/**
*
* @param {Object} point
* @param {Object} level
*/
convertLatLonXY_Yahoo: function(point, level) { //Mercator
var size = 1 << (26 - level);
var pixel_per_degree = size / 360.0;
var pixel_per_radian = size / (2 * Math.PI);
var origin = new YCoordPoint(size / 2 , size / 2);
var answer = new YCoordPoint();
answer.x = Math.floor(origin.x + point.lon * pixel_per_degree);
var sin = Math.sin(point.lat * Math.PI / 180.0);
answer.y = Math.floor(origin.y + 0.5 * Math.log((1 + sin) / (1 - sin)) * -pixel_per_radian);
return answer;
},
/**
* Load a stylesheet from a remote file.
* @param {String} href URL to the CSS file
*/
loadStyle: function(href) {
var link = document.createElement('link');
link.type = 'text/css';
link.rel = 'stylesheet';
link.href = href;
document.getElementsByTagName('head')[0].appendChild(link);
return;
},
/**
* getStyle provides cross-browser access to css
* @param {Object} el HTML Element
* @param {String} prop Style property name
*/
getStyle: function(el, prop) {
var y;
if (el.currentStyle) {
y = el.currentStyle[prop];
}
else if (window.getComputedStyle) {
y = window.getComputedStyle( el, '').getPropertyValue(prop);
}
return y;
},
/**
* Convert longitude to metres
* http://www.uwgb.edu/dutchs/UsefulData/UTMFormulas.HTM
* "A degree of longitude at the equator is 111.2km... For other latitudes,
* multiply by cos(lat)"
* assumes the earth is a sphere but good enough for our purposes
* @param {Float} lon
* @param {Float} lat
*/
lonToMetres: function(lon, lat) {
return lon * (111200 * Math.cos(lat * (Math.PI / 180)));
},
/**
* Convert metres to longitude
* @param {Object} m
* @param {Object} lat
*/
metresToLon: function(m, lat) {
return m / (111200 * Math.cos(lat * (Math.PI / 180)));
},
/**
* Convert kilometres to miles
* @param {Float} km
* @returns {Float} miles
*/
KMToMiles: function(km) {
return km / 1.609344;
},
/**
* Convert miles to kilometres
* @param {Float} miles
* @returns {Float} km
*/
milesToKM: function(miles) {
return miles * 1.609344;
},
// stuff to convert google zoom levels to/from degrees
// assumes zoom 0 = 256 pixels = 360 degrees
// zoom 1 = 256 pixels = 180 degrees
// etc.
/**
*
* @param {Object} pixels
* @param {Object} zoom
*/
getDegreesFromGoogleZoomLevel: function(pixels, zoom) {
return (360 * pixels) / (Math.pow(2, zoom + 8));
},
/**
*
* @param {Object} pixels
* @param {Object} degrees
*/
getGoogleZoomLevelFromDegrees: function(pixels, degrees) {
return mxn.util.logN((360 * pixels) / degrees, 2) - 8;
},
/**
*
* @param {Object} number
* @param {Object} base
*/
logN: function(number, base) {
return Math.log(number) / Math.log(base);
},
/**
* Returns array of loaded provider apis
* @returns {Array} providers
*/
getAvailableProviders : function () {
var providers = [];
for (var propertyName in apis){
if (apis.hasOwnProperty(propertyName)) {
providers.push(propertyName);
}
}
return providers;
}
};
/**
* Class for converting between HTML and RGB integer color formats.
* Accepts either a HTML color string argument or three integers for R, G and B.
* @constructor
*/
mxn.util.Color = function() {
if(arguments.length == 3) {
this.red = arguments[0];
this.green = arguments[1];
this.blue = arguments[2];
}
else if(arguments.length == 1) {
this.setHexColor(arguments[0]);
}
};
mxn.util.Color.prototype.reHex = /^#?([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$/;
/**
* Set the color from the supplied HTML hex string.
* @param {String} strHexColor A HTML hex color string e.g. '#00FF88'.
*/
mxn.util.Color.prototype.setHexColor = function(strHexColor) {
var match = strHexColor.match(this.reHex);
if(match) {
strHexColor = match[1];
}
else {
throw 'Invalid HEX color format, expected #000, 000, #000000 or 000000';
}
if(strHexColor.length == 3) {
strHexColor = strHexColor.replace(/\w/g, function(str){return str.concat(str);});
}
this.red = parseInt(strHexColor.substr(0,2), 16);
this.green = parseInt(strHexColor.substr(2,2), 16);
this.blue = parseInt(strHexColor.substr(4,2), 16);
};
/**
* Retrieve the color value as an HTML hex string.
* @returns {String} Format '00FF88' - note no preceding #.
*/
mxn.util.Color.prototype.getHexColor = function() {
var vals = [this.red.toString(16), this.green.toString(16), this.blue.toString(16)];
for(var i = 0; i < vals.length; i++) {
vals[i] = (vals[i].length == 1) ? '0' + vals[i] : vals[i];
vals[i] = vals[i].toUpperCase();
}
return vals.join('');
};
})();