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index.html
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index.html
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<!-- original example from https://developers.google.com/maps/documentation/javascript/examples/layer-data-dragndrop -->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<title>Drag and Drop GeoJSON</title>
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0; overflow: hidden; }
#map-canvas { height: 100% }
#drop-container {
display: none;
height: 100%;
width: 100%;
position: absolute;
z-index: 1;
top: 0px;
left: 0px;
padding: 20px;
background-color: rgba(100, 100, 100, 0.5);
}
#drop-silhouette {
color: white;
border: white dashed 8px;
height: calc(100% - 56px);
width: calc(100% - 56px);
background-image: url('data:image/png;base64,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');
background-repeat: no-repeat;
background-position: center;
}
</style>
<script src="https://maps.googleapis.com/maps/api/js?key=<insert API key here>&v=3.exp"></script>
<script type="text/javascript">
var map;
var bounds;
function initMap() {
// set up the map
map = new google.maps.Map(document.getElementById('map-canvas'), {
center: new google.maps.LatLng(0, 0),
zoom: 2
});
// set up the bounds
bounds = new google.maps.LatLngBounds();
}
/**
* converts arrays (of arrays (of arrays)) of coordinate pairs to LatLng objects.
* also updates the bounds for map auto-fit
**/
function coord2LatLng(arr, depth) {
if (depth === 0) {
// for Point
var p = new google.maps.LatLng(arr[1], arr[0]);
bounds.extend(p);
return p;
}
if (depth === 1) {
// for LineString
return arr.map(function (c) {
var p = new google.maps.LatLng(c[1], c[0]);
bounds.extend(p);
return p;
});
}
if (depth === 2) {
// for MultiLineString, Polygon
var paths = [];
arr.forEach(function (path) {
paths.push(path.map(function (coords) {
var p = new google.maps.LatLng(coords[1], coords[0]);
bounds.extend(p);
return p;
}));
});
return paths;
}
}
var colors = ['#1f77b4', '#ff7f0e','#2ca02c','#d62728','#9467bd','#8c564b','#e377c2','#7f7f7f','#bcbd22','#17becf']
var counter = 0;
function getNextColor() {
return color = colors[counter++ % colors.length];
}
/**
* load GeoJSON string or object and render shape on map
**/
function loadGeoJson(geo, color) {
if (typeof geo === 'string') {
geo = JSON.parse(geo);
}
if (geo.type.toLowerCase() === 'polygon') {
var polygon = new google.maps.Polygon({
map: map,
paths: coord2LatLng(geo.coordinates, 2),
strokeColor: color,
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: color,
fillOpacity: 0.30,
geodesic: true,
draggable: true
});
} else if (geo.type.toLowerCase() === 'linestring') {
var polyline = new google.maps.Polyline({
map: map,
path: coord2LatLng(geo.coordinates, 1),
strokeColor: color,
strokeOpacity: 0.8,
strokeWeight: 2,
geodesic: true
});
} else if (geo.type.toLowerCase() === 'point') {
var marker = new google.maps.Marker({
map: map,
position: coord2LatLng(geo.coordinates, 0)
});
} else if (geo.type.toLowerCase() === 'multipoint') {
var points = coord2LatLng(geo.coordinates, 1);
points.forEach(function (point) {
var marker = new google.maps.Marker({
map: map,
position: point
});
});
} else if (geo.type.toLowerCase() === 'geometrycollection') {
geo.geometries.forEach(loadGeoJson, color);
}
}
/**
* DOM (drag/drop) functions
**/
function initEvents() {
// set up the drag & drop events
var mapContainer = document.getElementById('map-canvas');
var dropContainer = document.getElementById('drop-container');
// first on common events
[mapContainer, dropContainer].forEach(function(container) {
container.addEventListener('drop', handleDrop, false);
container.addEventListener('dragover', showPanel, false);
});
// then map-specific events
mapContainer.addEventListener('dragstart', showPanel, false);
mapContainer.addEventListener('dragenter', showPanel, false);
// then the overlay specific events (since it only appears once drag starts)
dropContainer.addEventListener('dragend', hidePanel, false);
dropContainer.addEventListener('dragleave', hidePanel, false);
}
function showPanel(e) {
e.stopPropagation();
e.preventDefault();
document.getElementById('drop-container').style.display = 'block';
return false;
}
function hidePanel(e) {
document.getElementById('drop-container').style.display = 'none';
}
function handleDrop(e) {
e.preventDefault();
e.stopPropagation();
hidePanel(e);
var color = getNextColor();
var files = e.dataTransfer.files;
if (files.length) {
// process file(s) being dropped
// grab the file data from each file
for (var i = 0, file; file = files[i]; i++) {
var reader = new FileReader();
reader.onload = function(e) {
loadGeoJson(e.target.result, color);
map.fitBounds(bounds);
};
reader.onerror = function(e) {
console.error('reading failed');
};
reader.readAsText(file);
}
} else {
// process non-file (e.g. text or html) content being dropped
// grab the plain text version of the data
var plainText = e.dataTransfer.getData('text/plain');
if (plainText) {
loadGeoJson(plainText, color);
map.fitBounds(bounds);
}
}
// prevent drag event from bubbling further
return false;
}
google.maps.event.addDomListener(window, 'load', function() {
initMap();
initEvents();
});
</script>
</head>
<body>
<div id="map-canvas"></div>
<div id="drop-container"><div id="drop-silhouette"></div></div>
</body>
</html>