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<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<title>Rectangle Overlay</title>
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<style type="text/css">
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#map {
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width: 1200px;
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height: 800px;
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margin: 5px;
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}
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h2 {
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margin: 2px;
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}
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ul {
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margin: 2px;
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}
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body {
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font-size: 12pt;
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font-family: Arial, sans-serif;
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}
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</style>
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<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
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<script type="text/javascript">
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// Global variables
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var map;
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var marker1;
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var marker2;
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var rectangle;
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/**
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* Called on the initial page load.
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*/
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function init() {
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//window.alert("Init called");
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var qs = GetQueryString();
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//qs = decodeURIComponent(qs);
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//Set map width if specified
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if (!(typeof qs.width === "undefined")) {
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document.getElementById('map').style.width=qs.width[0].concat("px");
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//window.alert("width");
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}
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//Set map height if specified
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if (!(typeof qs.height === "undefined")) {
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document.getElementById('map').style.height=qs.height[0].concat("px");
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//window.alert("height");
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}
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//Display help if expected parameters are not specified
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if ( typeof qs.s === "undefined" || typeof qs.w === "undefined" || typeof qs.n === "undefined" || typeof qs.e === "undefined") {
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document.getElementById('help').innerHTML='Pass the URI parameters as follow: \
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<ul>\
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<li>\'s\' for southernmost latitude.</li>\
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<li>\'n\' for northernmost latitude.</li>\
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<li>\'e\' for easternmost longitude.</li>\
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<li>\'w\' for westernmost longitude.</li>\
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<li>\'c\' Specify a <a href="http://www.w3schools.com/cssref/css_colornames.asp">color name</a> or value (use %23FFFFFF for white) for your rectangles.</li>\
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<li>\'a\' Specify alpha opacity of your rectangle fill, it should be between 1 and 0. For instance 0.5 makes it half transparent.</li>\
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<li>\'width\' Map width in pixels, default is 1200.</li>\
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<li>\'height\' Map heigh in pixels, default is 800.</li>\
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</ul>\
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You can specify any number of rectangles.<br />\
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Map will be centered on the first rectangle.<br />\
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Click <a href="rectangle-overlay-params.html?w=8.619000&n=50.134350&e=8.714110&s=50.091180&w=8.657227&n=50.119630&e=8.673706&s=50.108644&w=8.652547&n=50.109318&e=8.658400&s=50.105320&c=black&c=%23FF0000&c=green&a=0.3&a=0.75&c=0.5">here</a> for an example.';
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//Still display the map
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map = new google.maps.Map(document.getElementById('map'), {
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'zoom': 3,
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'center': new google.maps.LatLng(45,0),
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'mapTypeId': google.maps.MapTypeId.ROADMAP
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});
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return;
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}
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var latLngBounds = new google.maps.LatLngBounds(
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new google.maps.LatLng(qs.s[0], qs.w[0]),
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new google.maps.LatLng(qs.n[0], qs.e[0])
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);
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map = new google.maps.Map(document.getElementById('map'), {
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'zoom': 12,
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'center': new google.maps.LatLng(latLngBounds.getCenter().lat(),latLngBounds.getCenter().lng()),
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'mapTypeId': google.maps.MapTypeId.ROADMAP
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});
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//window.alert(qs.s.length);
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//Create all our rectangles
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rectangles = []; //Create rectangles array
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for (var i = 0; i < qs.s.length; i++) {
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rectangles.push(new google.maps.Rectangle({ map: map,
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fillColor: (typeof qs.c === "undefined" || typeof qs.c[i] === "undefined"?'#666666':decodeURIComponent(qs.c[i])),
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fillOpacity: (typeof qs.a === "undefined" || typeof qs.a[i] === "undefined"?'0.2':decodeURIComponent(qs.a[i])),
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strokeColor: (typeof qs.c === "undefined" || typeof qs.c[i] === "undefined"?'#666666':decodeURIComponent(qs.c[i])),
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strokeOpacity: 1.0,
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strokeWeight: 1
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}));
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//window.alert(decodeURIComponent(qs.c[i]));
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}
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redraw();
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}
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/**
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* Updates the Rectangle's bounds to resize its dimensions.
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*/
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function redraw() {
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var qs = GetQueryString();
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for (var i = 0; i < qs.s.length; i++) {
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var latLngBounds = new google.maps.LatLngBounds(
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new google.maps.LatLng(qs.s[i], qs.w[i]),
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new google.maps.LatLng(qs.n[i], qs.e[i])
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);
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rectangles[i].setBounds(latLngBounds);
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}
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}
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/**
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* This function is anonymous, is executed immediately and
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* the return value is assigned to QueryString!
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*/
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function GetQueryString() {
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var query_string = {};
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var query = window.location.search.substring(1);
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var vars = query.split("&");
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//window.alert("URL param count: " + vars.length);
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for (var i=0;i<vars.length;i++) {
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var pair = vars[i].split("=");
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// If first entry with this name
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if ((typeof query_string[pair[0]] === "undefined") ) {
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//Instantiate an array for that parameter
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var arr = [ pair[1] ];
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query_string[pair[0]] = arr;
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//window.alert("Create param '" + pair[0] + "' with value: " + pair[1]);
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} else {
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//Add a value to our existing parameter array
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//window.alert("Add param '" + pair[0] + "' with value: " + pair[1]);
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query_string[pair[0]].push(pair[1]);
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}
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}
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return query_string;
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}
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// Register an event listener to fire when the page finishes loading.
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google.maps.event.addDomListener(window, 'load', init);
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</script>
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</head>
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<body>
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<h2>Google maps rectangle overlay</h2>
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<div id="help"><a href='rectangle-overlay-params.html'>help</a></div>
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<div id="map"></div>
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</body>
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</html>
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