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<!DOCTYPE html>
<html>
<head>
<title>Get Bounding Box</title>
<script type="text/javascript" src="../../modestmaps.js"></script>
<script type="text/javascript">
function BoundingBox(map) {
this.map = map;
var theBox = this;
this.getMousePoint = function(e) {
// start with just the mouse (x, y)
var point = new com.modestmaps.Point(e.clientX, e.clientY);
// correct for scrolled document
point.x += document.body.scrollLeft + document.documentElement.scrollLeft;
point.y += document.body.scrollTop + document.documentElement.scrollTop;
// correct for nested offsets in DOM
for(var node = this.map.parent; node; node = node.offsetParent) {
point.x -= node.offsetLeft;
point.y -= node.offsetTop;
}
return point;
};
var boxDiv = document.createElement('div');
boxDiv.id = map.parent.id+'-boundingBox';
boxDiv.width = map.dimensions.x;
boxDiv.height = map.dimensions.y;
boxDiv.style.margin = '0';
boxDiv.style.padding = '0';
boxDiv.style.position = 'absolute';
boxDiv.style.top = '0px';
boxDiv.style.left = '0px';
boxDiv.style.width = map.dimensions.x+'px';
boxDiv.style.height = map.dimensions.y+'px';
map.parent.appendChild(boxDiv);
var box = document.createElement('div');
box.id = map.parent.id+'-boundingBox-box';
box.width = map.dimensions.x;
box.height = map.dimensions.y;
box.style.margin = '0';
box.style.padding = '0';
box.style.outlineWidth = '1000px';
box.style.outlineColor = 'rgba(0,0,0,0.2)';
box.style.outlineStyle = 'solid';
box.style.position = 'absolute';
box.style.display = 'none';
box.style.top = '0px';
box.style.left = '0px';
box.style.width = '0px';
box.style.height = '0px';
boxDiv.appendChild(box);
// TODO: respond to resize
var mouseDownPoint = null;
this.mouseDown = function(e) {
if (e.shiftKey) {
mouseDownPoint = theBox.getMousePoint(e);
box.style.width = '0px';
box.style.height = '0px';
box.style.left = mouseDownPoint.x + 'px';
box.style.top = mouseDownPoint.y + 'px';
com.modestmaps.addEvent(map.parent, 'mousemove', theBox.mouseMove);
com.modestmaps.addEvent(map.parent, 'mouseup', theBox.mouseUp);
map.parent.style.cursor = 'crosshair';
return com.modestmaps.cancelEvent(e);
}
};
this.mouseMove = function(e) {
var point = theBox.getMousePoint(e);
box.style.display = 'block';
if (point.x < mouseDownPoint.x) {
box.style.left = point.x + 'px';
}
else {
box.style.left = mouseDownPoint.x + 'px';
}
box.style.width = Math.abs(point.x - mouseDownPoint.x) + 'px';
if (point.y < mouseDownPoint.y) {
box.style.top = point.y + 'px';
}
else {
box.style.top = mouseDownPoint.y + 'px';
}
box.style.height = Math.abs(point.y - mouseDownPoint.y) + 'px';
theBox.updateInfo();
return com.modestmaps.cancelEvent(e);
};
this.updateInfo = function() {
if (box.style.display != 'none') {
var p1 = new com.modestmaps.Point(box.offsetLeft, box.offsetTop);
var p2 = new com.modestmaps.Point(box.offsetLeft+box.offsetWidth, box.offsetTop+box.offsetHeight);
//window.console.log(p1,p2);
var l1 = map.pointLocation(p1);
var l2 = map.pointLocation(p2);
//window.console.log(l1,l2);
var northWest = new com.modestmaps.Location(Math.max(l1.lat,l2.lat), Math.min(l1.lon, l2.lon));
var southEast = new com.modestmaps.Location(Math.min(l1.lat,l2.lat), Math.max(l1.lon, l2.lon));
document.getElementById('info').innerHTML = "N,W,S,E: <tt>" + [ northWest.lat.toFixed(6), northWest.lon.toFixed(6), southEast.lat.toFixed(6), southEast.lon.toFixed(6) ].join(', ') + "</tt>";
document.getElementById('info').innerHTML += "<br>S,W,N,E: <tt>" + [ southEast.lat.toFixed(6), northWest.lon.toFixed(6), northWest.lat.toFixed(6), southEast.lon.toFixed(6) ].join(', ') + "</tt>";
}
};
this.mouseUp = function(e) {
theBox.updateInfo();
com.modestmaps.removeEvent(map.parent, 'mousemove', theBox.mouseMove);
com.modestmaps.removeEvent(map.parent, 'mouseup', theBox.mouseUp);
map.parent.style.cursor = 'auto';
return com.modestmaps.cancelEvent(e);
};
com.modestmaps.addEvent(boxDiv, 'mousedown', this.mouseDown);
}
var map, boundingBox;
function initMap() {
var container = document.getElementById('container');
map = new com.modestmaps.Map('map',
new com.modestmaps.TemplatedLayer('http://tile.openstreetmap.org/{Z}/{X}/{Y}.png'),
new com.modestmaps.Point(container.offsetWidth, container.offsetHeight));
map.setCenterZoom(new com.modestmaps.Location(0, 0), 1);
boundingBox = new BoundingBox(map);
window.onresize = function() {
map.setSize(container.offsetWidth, container.offsetHeight);
};
function onMapChange() {
boundingBox.updateInfo();
}
map.addCallback('panned', onMapChange);
map.addCallback('resized', onMapChange);
map.addCallback('zoomed', onMapChange);
map.addCallback('extentset', onMapChange);
map.addCallback('centered', onMapChange);
}
</script>
<style type="text/css">
body {
background: #fff;
color: #000;
font-family: sans-serif;
margin: 0;
padding: 20px;
border: 0;
}
div#container {
width: 100%;
height: 512px;
}
p#credit {
font-size: 80%;
color: #444;
text-align: center;
margin-top: 30px;
}
</style>
</head>
<body onload="initMap()">
<h1>Get Bounding Box</h1>
<p id="info">Shift-click and drag to draw a bounding box.<br> </p>
<div id="container">
<div id="map">
</div>
</div>
<p>Click and drag to pan, mouse-wheel to zoom. Shift-click and drag to draw a bounding box.</p>
<p id="credit">Powered by <a href="http://modestmaps.com">Modest Maps JS</a>. Map imagery <a href="http://wiki.openstreetmap.org/wiki/Licence">CC-BY-SA OpenStreetMap.org contributors</a>, used with reference to the <a href="http://wiki.openstreetmap.org/wiki/Tile_usage_policy">OSM tile usage policy</a>.</p>
</body>
</html>
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