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geonetkml.js
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geonetkml.js
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/*
* Timemap.js Copyright 2010 Nick Rabinowitz.
* Licensed under the MIT License (see LICENSE.txt)
*/
/**
* @fileOverview
* KML Loader
*
* @author Nick Rabinowitz (www.nickrabinowitz.com)
*/
/*globals GXml, TimeMap */
/**
* @class
* KML loader: load KML files.
*
* <p>This is a loader class for KML files. Currently supports all geometry
* types (point, polyline, polygon, and overlay) and multiple geometries. Supports loading
* <a href="http://code.google.com/apis/kml/documentation/extendeddata.html">ExtendedData</a>
* through the extendedData parameter.
* </p>
*
* @augments TimeMap.loaders.xml
* @requires loaders/xml.js
* @requires param.js
* @borrows TimeMap.loaders.kml.parse as #parse
*
* @example
TimeMap.init({
datasets: [
{
title: "KML Dataset",
type: "kml",
options: {
url: "mydata.kml" // Must be local
}
}
],
// etc...
});
* @see <a href="../../examples/kenya.html">KML Example</a>
* @see <a href="../../examples/kml_extendeddata.html">KML ExtendedData Example</a>
*
* @param {Object} options All options for the loader
* @param {String} options.url URL of KML file to load (NB: must be local address)
* @param {String[]} [options.extendedData] Array of names for ExtendedData data elements
* @param {mixed} [options[...]] Other options (see {@link TimeMap.loaders.xml})
* @return {TimeMap.loaders.xml} Loader configured for KML
*/
TimeMap.loaders.geonetkml = function(options) {
var loader = new TimeMap.loaders.xml(options),
tagMap = options.tagMap || {},
extendedData = options.extendedData || [],
tagName, x;
// Add ExtendedData parameters to extra params
for (x=0; x < extendedData.length; x++) {
tagName = extendedData[x];
loader.extraParams.push(
new TimeMap.params.ExtendedDataParam(tagMap[tagName] || tagName, tagName)
);
}
// set custom parser
loader.parse = TimeMap.loaders.geonetkml.parse;
return loader;
};
/**
* Static function to parse KML with time data.
*
* @param {XML string} kml KML to be parsed
* @return {TimeMapItem Array} Array of TimeMapItems
*/
TimeMap.loaders.geonetkml.parse = function(kml) {
var items = [], data, kmlnode, placemarks, pm, i, j;
kmlnode = GXml.parse(kml);
// get TimeMap utilty functions
// assigning to variables should compress better
var util = TimeMap.util,
getTagValue = util.getTagValue,
getNodeList = util.getNodeList,
makePoint = util.makePoint,
makePoly = util.makePoly,
formatDate = util.formatDate;
// recursive time data search
var findNodeTime = function(n, data) {
var check = false;
// look for instant timestamp
var nList = getNodeList(n, "TimeStamp");
if (nList.length > 0) {
data.start = getTagValue(nList[0], "when");
check = true;
}
// otherwise look for span
else {
nList = getNodeList(n, "TimeSpan");
if (nList.length > 0) {
data.start = getTagValue(nList[0], "begin");
data.end = getTagValue(nList[0], "end") ||
// unbounded spans end at the present time
formatDate(new Date());
check = true;
}
}
// try looking recursively at parent nodes
if (!check) {
var pn = n.parentNode;
if (pn.nodeName == "Folder" || pn.nodeName=="Document") {
findNodeTime(pn, data);
}
pn = null;
}
};
// look for placemarks
placemarks = getNodeList(kmlnode, "Placemark");
for (i=0; i<placemarks.length; i++) {
pm = placemarks[i];
data = { options: {} };
// get title & description
data.title = getTagValue(pm, "name");
data.options.description = getTagValue(pm, "description");
// get time information
findNodeTime(pm, data);
// find placemark(s)
var nList, coords, pmobj;
data.placemarks = [];
// look for marker
nList = getNodeList(pm, "Point");
for (j=0; j<nList.length; j++) {
pmobj = { point: {} };
// get lat/lon
coords = getTagValue(nList[j], "coordinates");
pmobj.point = makePoint(coords, 1);
data.placemarks.push(pmobj);
}
// look for polylines
nList = getNodeList(pm, "LineString");
for (j=0; j<nList.length; j++) {
pmobj = { polyline: [] };
// get lat/lon
coords = getTagValue(nList[j], "coordinates");
pmobj.polyline = makePoly(coords, 1);
data.placemarks.push(pmobj);
}
// look for polygons
nList = getNodeList(pm, "Polygon");
for (j=0; j<nList.length; j++) {
pmobj = { polygon: [] };
// get lat/lon
coords = getTagValue(nList[j], "coordinates");
pmobj.polygon = makePoly(coords, 1);
// XXX: worth closing unclosed polygons?
data.placemarks.push(pmobj);
}
// look for any extra tags and/or ExtendedData specified
this.parseExtra(data, pm);
// set theme based on style
switch (Math.floor(data.options.mag)) {
case 7:
data.options.theme = 'red';
break;
case 6:
data.options.theme = 'orange';
break;
case 5:
data.options.theme = 'yellow';
break;
case 4:
data.options.theme = 'green';
break;
case 3:
data.options.theme = 'blue';
break;
default:
data.options.theme = 'ltblue';
break;
}
items.push(data);
}
// look for ground overlays
placemarks = getNodeList(kmlnode, "GroundOverlay");
for (i=0; i<placemarks.length; i++) {
pm = placemarks[i];
data = { options: {}, overlay: {} };
// get title & description
data.title = getTagValue(pm, "name");
data.options.description = getTagValue(pm, "description");
// get time information
findNodeTime(pm, data);
// get image
nList = getNodeList(pm, "Icon");
data.overlay.image = getTagValue(nList[0], "href");
// get coordinates
nList = getNodeList(pm, "LatLonBox");
data.overlay.north = getTagValue(nList[0], "north");
data.overlay.south = getTagValue(nList[0], "south");
data.overlay.east = getTagValue(nList[0], "east");
data.overlay.west = getTagValue(nList[0], "west");
// look for any extra tags and/or ExtendedData specified
this.parseExtra(data, pm);
items.push(data);
}
// clean up
kmlnode = placemarks = pm = nList = null;
return items;
};
/**
* @class
* Class for parameters loaded from KML ExtendedData elements
*
* @augments TimeMap.params.OptionParam
*
* @constructor
* @param {String} paramName String name of the parameter
* @param {String} [tagName] Tag name, if different
*/
TimeMap.params.ExtendedDataParam = function(paramName, tagName) {
return new TimeMap.params.OptionParam(paramName, {
/**
* Set a config object based on an ExtendedData element
* @name TimeMap.params.ExtendedDataParam#setConfigKML
* @function
*
* @param {Object} config Config object to modify
* @param {XML NodeList} node Parent node to look for tags in
*/
setConfigXML: function(config, node) {
var util = TimeMap.util,
nList = util.getNodeList(node, "Data"),
i;
for (i=0; i<nList.length; i++) {
if (nList[i].getAttribute("name") == tagName) {
this.setConfig(config, util.getTagValue(nList[i], "value"))
}
}
node = nList = null;
},
sourceName: tagName
});
};