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mxn.core.js
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mxn.core.js
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(function(){
/**
* @exports mxn.util.$m as $m
*/
var $m = mxn.util.$m;
/**
* Initialise our provider. This function should only be called
* from within mapstraction code, not exposed as part of the API.
* @private
*/
var init = function() {
this.invoker.go('init', [ this.currentElement, this.api ]);
this.applyOptions();
};
/**
* Mapstraction instantiates a map with some API choice into the HTML element given
* @name mxn.Mapstraction
* @constructor
* @param {String} element The HTML element to replace with a map
* @param {String} api The API to use, one of 'google', 'googlev3', 'yahoo', 'microsoft', 'openstreetmap', 'multimap', 'map24', 'openlayers', 'mapquest'. If omitted, first loaded provider implementation is used.
* @param {Bool} debug optional parameter to turn on debug support - this uses alert panels for unsupported actions
* @exports Mapstraction as mxn.Mapstraction
*/
var Mapstraction = mxn.Mapstraction = function(element, api, debug) {
if (!api){
api = mxn.util.getAvailableProviders()[0];
}
/**
* The name of the active API.
* @name mxn.Mapstraction#api
* @type {String}
*/
this.api = api;
this.maps = {};
/**
* The DOM element containing the map.
* @name mxn.Mapstraction#currentElement
* @property
* @type {DOMElement}
*/
this.currentElement = $m(element);
this.eventListeners = [];
/**
* The array of all layers that have been added to the map.
*/
this.tileLayers = [];
/**
* The markers currently loaded.
* @name mxn.Mapstraction#markers
* @property
* @type {Array}
*/
this.markers = [];
/**
* The polylines currently loaded.
* @name mxn.Mapstraction#polylines
* @property
* @type {Array}
*/
this.polylines = [];
this.images = [];
this.controls = [];
this.loaded = {};
this.onload = {};
//this.loaded[api] = true; // FIXME does this need to be true? -ajturner
this.onload[api] = [];
/**
* The original element value passed to the constructor.
* @name mxn.Mapstraction#element
* @property
* @type {String|DOMElement}
*/
this.element = element;
/**
* Options defaults.
* @name mxn.Mapstraction#options
* @property {Object}
*/
this.options = {
enableScrollWheelZoom: false,
enableDragging: true
};
this.addControlsArgs = {};
// set up our invoker for calling API methods
this.invoker = new mxn.Invoker(this, 'Mapstraction', function(){ return this.api; });
// Adding our events
mxn.addEvents(this, [
/**
* Map has loaded
* @name mxn.Mapstraction#load
* @event
*/
'load',
/**
* Map is clicked {location: LatLonPoint}
* @name mxn.Mapstraction#click
* @event
*/
'click',
/**
* Map is panned
* @name mxn.Mapstraction#endPan
* @event
*/
'endPan',
/**
* Zoom is changed
* @name mxn.Mapstraction#changeZoom
* @event
*/
'changeZoom',
/**
* Marker is added {marker: Marker}
* @name mxn.Mapstraction#markerAdded
* @event
*/
'markerAdded',
/**
* Marker is removed {marker: Marker}
* @name mxn.Mapstraction#markerRemoved
* @event
*/
'markerRemoved',
/**
* Polyline is added {polyline: Polyline}
* @name mxn.Mapstraction#polylineAdded
* @event
*/
'polylineAdded',
/**
* Polyline is removed {polyline: Polyline}
* @name mxn.Mapstraction#polylineRemoved
* @event
*/
'polylineRemoved'
]);
// finally initialize our proper API map
init.apply(this);
};
// Map type constants
Mapstraction.ROAD = 1;
Mapstraction.SATELLITE = 2;
Mapstraction.HYBRID = 3;
Mapstraction.PHYSICAL = 4;
// methods that have no implementation in mapstraction core
mxn.addProxyMethods(Mapstraction, [
/**
* Adds a large map panning control and zoom buttons to the map
* @name mxn.Mapstraction#addLargeControls
* @function
*/
'addLargeControls',
/**
* Adds a map type control to the map (streets, aerial imagery etc)
* @name mxn.Mapstraction#addMapTypeControls
* @function
*/
'addMapTypeControls',
/**
* Adds a GeoRSS or KML overlay to the map
* some flavors of GeoRSS and KML are not supported by some of the Map providers
* @name mxn.Mapstraction#addOverlay
* @function
* @param {String} url GeoRSS or KML feed URL
* @param {Boolean} autoCenterAndZoom Set true to auto center and zoom after the feed is loaded
*/
'addOverlay',
/**
* Adds a small map panning control and zoom buttons to the map
* @name mxn.Mapstraction#addSmallControls
* @function
*/
'addSmallControls',
/**
* Applies the current option settings
* @name mxn.Mapstraction#applyOptions
* @function
*/
'applyOptions',
/**
* Gets the BoundingBox of the map
* @name mxn.Mapstraction#getBounds
* @function
* @returns {BoundingBox} The bounding box for the current map state
*/
'getBounds',
/**
* Gets the central point of the map
* @name mxn.Mapstraction#getCenter
* @function
* @returns {LatLonPoint} The center point of the map
*/
'getCenter',
/**
* Gets the imagery type for the map.
* The type can be one of:
* mxn.Mapstraction.ROAD
* mxn.Mapstraction.SATELLITE
* mxn.Mapstraction.HYBRID
* mxn.Mapstraction.PHYSICAL
* @name mxn.Mapstraction#getMapType
* @function
* @returns {Number}
*/
'getMapType',
/**
* Returns a ratio to turn distance into pixels based on current projection
* @name mxn.Mapstraction#getPixelRatio
* @function
* @returns {Float} ratio
*/
'getPixelRatio',
/**
* Returns the zoom level of the map
* @name mxn.Mapstraction#getZoom
* @function
* @returns {Integer} The zoom level of the map
*/
'getZoom',
/**
* Returns the best zoom level for bounds given
* @name mxn.Mapstraction#getZoomLevelForBoundingBox
* @function
* @param {BoundingBox} bbox The bounds to fit
* @returns {Integer} The closest zoom level that contains the bounding box
*/
'getZoomLevelForBoundingBox',
/**
* Displays the coordinates of the cursor in the HTML element
* @name mxn.Mapstraction#mousePosition
* @function
* @param {String} element ID of the HTML element to display the coordinates in
*/
'mousePosition',
/**
* Resize the current map to the specified width and height
* (since it is actually on a child div of the mapElement passed
* as argument to the Mapstraction constructor, the resizing of this
* mapElement may have no effect on the size of the actual map)
* @name mxn.Mapstraction#resizeTo
* @function
* @param {Integer} width The width the map should be.
* @param {Integer} height The width the map should be.
*/
'resizeTo',
/**
* Sets the map to the appropriate location and zoom for a given BoundingBox
* @name mxn.Mapstraction#setBounds
* @function
* @param {BoundingBox} bounds The bounding box you want the map to show
*/
'setBounds',
/**
* setCenter sets the central point of the map
* @name mxn.Mapstraction#setCenter
* @function
* @param {LatLonPoint} point The point at which to center the map
* @param {Object} options Optional parameters
* @param {Boolean} options.pan Whether the map should move to the locations using a pan or just jump straight there
*/
'setCenter',
/**
* Centers the map to some place and zoom level
* @name mxn.Mapstraction#setCenterAndZoom
* @function
* @param {LatLonPoint} point Where the center of the map should be
* @param {Integer} zoom The zoom level where 0 is all the way out.
*/
'setCenterAndZoom',
/**
* Sets the imagery type for the map
* The type can be one of:
* mxn.Mapstraction.ROAD
* mxn.Mapstraction.SATELLITE
* mxn.Mapstraction.HYBRID
* mxn.Mapstraction.PHYSICAL
* @name mxn.Mapstraction#setMapType
* @function
* @param {Number} type
*/
'setMapType',
/**
* Sets the zoom level for the map
* MS doesn't seem to do zoom=0, and Gg's sat goes closer than it's maps, and MS's sat goes closer than Y!'s
* TODO: Mapstraction.prototype.getZoomLevels or something.
* @name mxn.Mapstraction#setZoom
* @function
* @param {Number} zoom The (native to the map) level zoom the map to.
*/
'setZoom',
/**
* Turns a Tile Layer on or off
* @name mxn.Mapstraction#toggleTileLayer
* @function
* @param {tile_url} url of the tile layer that was created.
*/
'toggleTileLayer'
]);
/**
* Sets the current options to those specified in oOpts and applies them
* @param {Object} oOpts Hash of options to set
*/
Mapstraction.prototype.setOptions = function(oOpts){
mxn.util.merge(this.options, oOpts);
this.applyOptions();
};
/**
* Sets an option and applies it.
* @param {String} sOptName Option name
* @param vVal Option value
*/
Mapstraction.prototype.setOption = function(sOptName, vVal){
this.options[sOptName] = vVal;
this.applyOptions();
};
/**
* Enable scroll wheel zooming
* @deprecated Use setOption instead.
*/
Mapstraction.prototype.enableScrollWheelZoom = function() {
this.setOption('enableScrollWheelZoom', true);
};
/**
* Enable/disable dragging of the map
* @param {Boolean} on
* @deprecated Use setOption instead.
*/
Mapstraction.prototype.dragging = function(on) {
this.setOption('enableDragging', on);
};
/**
* Change the current api on the fly
* @param {String} api The API to swap to
* @param element
*/
Mapstraction.prototype.swap = function(element,api) {
if (this.api === api) {
return;
}
var center = this.getCenter();
var zoom = this.getZoom();
this.currentElement.style.visibility = 'hidden';
this.currentElement.style.display = 'none';
this.currentElement = $m(element);
this.currentElement.style.visibility = 'visible';
this.currentElement.style.display = 'block';
this.api = api;
this.onload[api] = [];
if (this.maps[this.api] === undefined) {
init.apply(this);
for (var i = 0; i < this.markers.length; i++) {
this.addMarker(this.markers[i], true);
}
for (var j = 0; j < this.polylines.length; j++) {
this.addPolyline( this.polylines[j], true);
}
this.setCenterAndZoom(center,zoom);
}
else {
//sync the view
this.setCenterAndZoom(center,zoom);
//TODO synchronize the markers and polylines too
// (any overlays created after api instantiation are not sync'd)
}
this.addControls(this.addControlsArgs);
};
/**
* Returns the loaded state of a Map Provider
* @param {String} api Optional API to query for. If not specified, returns state of the originally created API
*/
Mapstraction.prototype.isLoaded = function(api){
if (api === null) {
api = this.api;
}
return this.loaded[api];
};
/**
* Set the debugging on or off - shows alert panels for functions that don't exist in Mapstraction
* @param {Boolean} debug true to turn on debugging, false to turn it off
*/
Mapstraction.prototype.setDebug = function(debug){
if(debug !== null) {
this.debug = debug;
}
return this.debug;
};
/**
* Set the api call deferment on or off - When it's on, mxn.invoke will queue up provider API calls until
* runDeferred is called, at which time everything in the queue will be run in the order it was added.
* @param {Boolean} set deferred to true to turn on deferment
*/
Mapstraction.prototype.setDefer = function(deferred){
this.loaded[this.api] = !deferred;
};
/**
* Run any queued provider API calls for the methods defined in the provider's implementation.
* For example, if defferable in mxn.[provider].core.js is set to {getCenter: true, setCenter: true}
* then any calls to map.setCenter or map.getCenter will be queued up in this.onload. When the provider's
* implementation loads the map, it calls this.runDeferred and any queued calls will be run.
*/
Mapstraction.prototype.runDeferred = function(){
while(this.onload[this.api].length > 0) {
this.onload[this.api].shift().apply(this); //run deferred calls
}
};
/////////////////////////
//
// Event Handling
//
// FIXME need to consolidate some of these handlers...
//
///////////////////////////
// Click handler attached to native API
Mapstraction.prototype.clickHandler = function(lat, lon, me) {
this.callEventListeners('click', {
location: new LatLonPoint(lat, lon)
});
};
// Move and zoom handler attached to native API
Mapstraction.prototype.moveendHandler = function(me) {
this.callEventListeners('moveend', {});
};
/**
* Add a listener for an event.
* @param {String} type Event type to attach listener to
* @param {Function} func Callback function
* @param {Object} caller Callback object
*/
Mapstraction.prototype.addEventListener = function() {
var listener = {};
listener.event_type = arguments[0];
listener.callback_function = arguments[1];
// added the calling object so we can retain scope of callback function
if(arguments.length == 3) {
listener.back_compat_mode = false;
listener.callback_object = arguments[2];
}
else {
listener.back_compat_mode = true;
listener.callback_object = null;
}
this.eventListeners.push(listener);
};
/**
* Call listeners for a particular event.
* @param {String} sEventType Call listeners of this event type
* @param {Object} oEventArgs Event args object to pass back to the callback
*/
Mapstraction.prototype.callEventListeners = function(sEventType, oEventArgs) {
oEventArgs.source = this;
for(var i = 0; i < this.eventListeners.length; i++) {
var evLi = this.eventListeners[i];
if(evLi.event_type == sEventType) {
// only two cases for this, click and move
if(evLi.back_compat_mode) {
if(evLi.event_type == 'click') {
evLi.callback_function(oEventArgs.location);
}
else {
evLi.callback_function();
}
}
else {
var scope = evLi.callback_object || this;
evLi.callback_function.call(scope, oEventArgs);
}
}
}
};
////////////////////
//
// map manipulation
//
/////////////////////
/**
* addControls adds controls to the map. You specify which controls to add in
* the associative array that is the only argument.
* addControls can be called multiple time, with different args, to dynamically change controls.
*
* args = {
* pan: true,
* zoom: 'large' || 'small',
* overview: true,
* scale: true,
* map_type: true,
* }
* @param {array} args Which controls to switch on
*/
Mapstraction.prototype.addControls = function( args ) {
this.addControlsArgs = args;
this.invoker.go('addControls', arguments);
};
/**
* Adds a marker pin to the map
* @param {Marker} marker The marker to add
* @param {Boolean} old If true, doesn't add this marker to the markers array. Used by the "swap" method
*/
Mapstraction.prototype.addMarker = function(marker, old) {
marker.mapstraction = this;
marker.api = this.api;
marker.location.api = this.api;
marker.map = this.maps[this.api];
var propMarker = this.invoker.go('addMarker', arguments);
marker.setChild(propMarker);
if (!old) {
this.markers.push(marker);
}
this.markerAdded.fire({'marker': marker});
};
/**
* addMarkerWithData will addData to the marker, then add it to the map
* @param {Marker} marker The marker to add
* @param {Object} data A data has to add
*/
Mapstraction.prototype.addMarkerWithData = function(marker, data) {
marker.addData(data);
this.addMarker(marker);
};
/**
* addPolylineWithData will addData to the polyline, then add it to the map
* @param {Polyline} polyline The polyline to add
* @param {Object} data A data has to add
*/
Mapstraction.prototype.addPolylineWithData = function(polyline, data) {
polyline.addData(data);
this.addPolyline(polyline);
};
/**
* removeMarker removes a Marker from the map
* @param {Marker} marker The marker to remove
*/
Mapstraction.prototype.removeMarker = function(marker) {
var current_marker;
for(var i = 0; i < this.markers.length; i++){
current_marker = this.markers[i];
if(marker == current_marker) {
this.invoker.go('removeMarker', arguments);
marker.onmap = false;
this.markers.splice(i, 1);
this.markerRemoved.fire({'marker': marker});
break;
}
}
};
/**
* removeAllMarkers removes all the Markers on a map
*/
Mapstraction.prototype.removeAllMarkers = function() {
var current_marker;
while(this.markers.length > 0) {
current_marker = this.markers.pop();
this.invoker.go('removeMarker', [current_marker]);
}
};
/**
* Declutter the markers on the map, group together overlapping markers.
* @param {Object} opts Declutter options
*/
Mapstraction.prototype.declutterMarkers = function(opts) {
if(this.loaded[this.api] === false) {
var me = this;
this.onload[this.api].push( function() {
me.declutterMarkers(opts);
} );
return;
}
var map = this.maps[this.api];
switch(this.api)
{
// case 'yahoo':
//
// break;
// case 'google':
//
// break;
// case 'openstreetmap':
//
// break;
// case 'microsoft':
//
// break;
// case 'openlayers':
//
// break;
case 'multimap':
/*
* Multimap supports quite a lot of decluttering options such as whether
* to use an accurate of fast declutter algorithm and what icon to use to
* represent a cluster. Using all this would mean abstracting all the enums
* etc so we're only implementing the group name function at the moment.
*/
map.declutterGroup(opts.groupName);
break;
// case 'mapquest':
//
// break;
// case 'map24':
//
// break;
case ' dummy':
break;
default:
if(this.debug) {
alert(this.api + ' not supported by Mapstraction.declutterMarkers');
}
}
};
/**
* Add a polyline to the map
* @param {Polyline} polyline The Polyline to add to the map
* @param {Boolean} old If true replaces an existing Polyline
*/
Mapstraction.prototype.addPolyline = function(polyline, old) {
polyline.api = this.api;
polyline.map = this.maps[this.api];
var propPoly = this.invoker.go('addPolyline', arguments);
polyline.setChild(propPoly);
if(!old) {
this.polylines.push(polyline);
}
this.polylineAdded.fire({'polyline': polyline});
};
// Private remove implementation
var removePolylineImpl = function(polyline) {
this.invoker.go('removePolyline', arguments);
polyline.onmap = false;
this.polylineRemoved.fire({'polyline': polyline});
};
/**
* Remove the polyline from the map
* @param {Polyline} polyline The Polyline to remove from the map
*/
Mapstraction.prototype.removePolyline = function(polyline) {
var current_polyline;
for(var i = 0; i < this.polylines.length; i++){
current_polyline = this.polylines[i];
if(polyline == current_polyline) {
this.polylines.splice(i, 1);
removePolylineImpl.call(this, polyline);
break;
}
}
};
/**
* Removes all polylines from the map
*/
Mapstraction.prototype.removeAllPolylines = function() {
var current_polyline;
while(this.polylines.length > 0) {
current_polyline = this.polylines.pop();
removePolylineImpl.call(this, current_polyline);
}
};
var collectPoints = function(bMarkers, bPolylines, predicate) {
var points = [];
if (bMarkers) {
for (var i = 0; i < this.markers.length; i++) {
var mark = this.markers[i];
if (!predicate || predicate(mark)) {
points.push(mark.location);
}
}
}
if (bPolylines) {
for(i = 0; i < this.polylines.length; i++) {
var poly = this.polylines[i];
if (!predicate || predicate(poly)) {
for (var j = 0; j < poly.points.length; j++) {
points.push(poly.points[j]);
}
}
}
}
return points;
};
/**
* Sets the center and zoom of the map to the smallest bounding box
* containing all markers and polylines
*/
Mapstraction.prototype.autoCenterAndZoom = function() {
var points = collectPoints.call(this, true, true);
this.centerAndZoomOnPoints(points);
};
/**
* centerAndZoomOnPoints sets the center and zoom of the map from an array of points
*
* This is useful if you don't want to have to add markers to the map
*/
Mapstraction.prototype.centerAndZoomOnPoints = function(points) {
var bounds = new BoundingBox(90, 180, -90, -180);
for (var i = 0, len = points.length; i < len; i++) {
bounds.extend(points[i]);
}
console.log(bounds)
this.setBounds(bounds);
};
/**
* Sets the center and zoom of the map to the smallest bounding box
* containing all visible markers and polylines
* will only include markers and polylines with an attribute of "visible"
*/
Mapstraction.prototype.visibleCenterAndZoom = function() {
var predicate = function(obj) {
return obj.getAttribute("visible");
};
var points = collectPoints.call(this, true, true, predicate);
this.centerAndZoomOnPoints(points);
};
/**
* Automatically sets center and zoom level to show all polylines
* @param {Number} padding Optional number of kilometers to pad around polyline
*/
Mapstraction.prototype.polylineCenterAndZoom = function(padding) {
padding = padding || 0;
var points = collectPoints.call(this, false, true);
if (padding > 0) {
var padPoints = [];
for (var i = 0; i < points.length; i++) {
var point = points[i];
var kmInOneDegreeLat = point.latConv();
var kmInOneDegreeLon = point.lonConv();
var latPad = padding / kmInOneDegreeLat;
var lonPad = padding / kmInOneDegreeLon;
var ne = new LatLonPoint(point.lat + latPad, point.lon + lonPad);
var sw = new LatLonPoint(point.lat - latPad, point.lon - lonPad);
padPoints.push(ne, sw);
}
points = points.concat(padPoints);
}
this.centerAndZoomOnPoints(points);
};
/**
* addImageOverlay layers an georeferenced image over the map
* @param {id} unique DOM identifier
* @param {src} url of image
* @param {opacity} opacity 0-100
* @param {west} west boundary
* @param {south} south boundary
* @param {east} east boundary
* @param {north} north boundary
*/
Mapstraction.prototype.addImageOverlay = function(id, src, opacity, west, south, east, north) {
var b = document.createElement("img");
b.style.display = 'block';
b.setAttribute('id',id);
b.setAttribute('src',src);
b.style.position = 'absolute';
b.style.zIndex = 1;
b.setAttribute('west',west);
b.setAttribute('south',south);
b.setAttribute('east',east);
b.setAttribute('north',north);
var oContext = {
imgElm: b
};
this.invoker.go('addImageOverlay', arguments, { context: oContext });
};
Mapstraction.prototype.setImageOpacity = function(id, opacity) {
if (opacity < 0) {
opacity = 0;
}
if (opacity >= 100) {
opacity = 100;
}
var c = opacity / 100;
var d = document.getElementById(id);
if(typeof(d.style.filter)=='string'){
d.style.filter='alpha(opacity:'+opacity+')';
}
if(typeof(d.style.KHTMLOpacity)=='string'){
d.style.KHTMLOpacity=c;
}
if(typeof(d.style.MozOpacity)=='string'){
d.style.MozOpacity=c;
}
if(typeof(d.style.opacity)=='string'){
d.style.opacity=c;
}
};
Mapstraction.prototype.setImagePosition = function(id) {
var imgElement = document.getElementById(id);
var oContext = {
latLng: {
top: imgElement.getAttribute('north'),
left: imgElement.getAttribute('west'),
bottom: imgElement.getAttribute('south'),
right: imgElement.getAttribute('east')
},
pixels: { top: 0, right: 0, bottom: 0, left: 0 }
};
this.invoker.go('setImagePosition', arguments, { context: oContext });
imgElement.style.top = oContext.pixels.top.toString() + 'px';
imgElement.style.left = oContext.pixels.left.toString() + 'px';
imgElement.style.width = (oContext.pixels.right - oContext.pixels.left).toString() + 'px';
imgElement.style.height = (oContext.pixels.bottom - oContext.pixels.top).toString() + 'px';
};
Mapstraction.prototype.addJSON = function(json) {
var features;
if (typeof(json) == "string") {
features = eval('(' + json + ')');
} else {
features = json;
}
features = features.features;
var map = this.maps[this.api];
var html = "";
var item;
var polyline;
var marker;
var markers = [];
if(features.type == "FeatureCollection") {
this.addJSON(features.features);
}
for (var i = 0; i < features.length; i++) {
item = features[i];
switch(item.geometry.type) {
case "Point":
html = "<strong>" + item.title + "</strong><p>" + item.description + "</p>";
marker = new Marker(new LatLonPoint(item.geometry.coordinates[1],item.geometry.coordinates[0]));
markers.push(marker);
this.addMarkerWithData(marker,{
infoBubble : html,
label : item.title,
date : "new Date(\""+item.date+"\")",
iconShadow : item.icon_shadow,
marker : item.id,
iconShadowSize : item.icon_shadow_size,
icon : item.icon,
iconSize : item.icon_size,
category : item.source_id,
draggable : false,
hover : false
});
break;
case "Polygon":
var points = [];
polyline = new Polyline(points);
mapstraction.addPolylineWithData(polyline,{
fillColor : item.poly_color,
date : "new Date(\""+item.date+"\")",
category : item.source_id,
width : item.line_width,
opacity : item.line_opacity,
color : item.line_color,
polygon : true
});
markers.push(polyline);
break;
default:
// console.log("Geometry: " + features.items[i].geometry.type);
}
}
return markers;
};
/**
* Adds a Tile Layer to the map
*
* Requires providing a parameterized tile url. Use {Z}, {X}, and {Y} to specify where the parameters
* should go in the URL.
*
* For example, the OpenStreetMap tiles are:
* m.addTileLayer("http://tile.openstreetmap.org/{Z}/{X}/{Y}.png", 1.0, "OSM", 1, 19, true);
*
* @param {tile_url} template url of the tiles.
* @param {opacity} opacity of the tile layer - 0 is transparent, 1 is opaque. (default=0.6)
* @param {copyright_text} copyright text to use for the tile layer. (default=Mapstraction)
* @param {min_zoom} Minimum (furtherest out) zoom level that tiles are available (default=1)
* @param {max_zoom} Maximum (closest) zoom level that the tiles are available (default=18)
* @param {map_type} Should the tile layer be a selectable map type in the layers palette (default=false)
*/
Mapstraction.prototype.addTileLayer = function(tile_url, opacity, copyright_text, min_zoom, max_zoom, map_type) {
if(!tile_url) {
return;
}
opacity = opacity || 0.6;
copyright_text = copyright_text || "Mapstraction";
min_zoom = min_zoom || 1;
max_zoom = max_zoom || 18;
map_type = map_type || false;