An example of using Leaflet AreaSelect to provide IIIF cropping.
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February 12, 2024 12:16
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Leaflet-IIIF Cropping
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var baseUrl = 'https://stacks.stanford.edu/image/iiif/hg676jb4964%2F0380_796-44'; | |
var map = L.map('map', { | |
center: [0, 0], | |
crs: L.CRS.Simple, | |
zoom: 0, | |
}); | |
var iiifLayer = L.tileLayer.iiif(baseUrl + '/info.json', { | |
tileSize: 512 | |
}).addTo(map); | |
var areaSelect = L.areaSelect({ | |
width:100, height:100 | |
}); | |
areaSelect.addTo(map); | |
$('#urlArea').html(baseUrl) | |
areaSelect.on('change', function() { | |
var bounds = this.getBounds(); | |
var zoom = map.getZoom(); | |
var min = map.project(bounds.getSouthWest(), zoom); | |
var max = map.project(bounds.getNorthEast(), zoom); | |
var imageSize = iiifLayer._imageSizes[zoom]; | |
var xRatio = iiifLayer.x / imageSize.x; | |
var yRatio = iiifLayer.y / imageSize.y; | |
var region = [ | |
Math.floor(min.x * xRatio), | |
Math.floor(max.y * yRatio), | |
Math.floor((max.x - min.x) * xRatio), | |
Math.floor((min.y - max.y) * yRatio) | |
]; | |
var url = baseUrl + '/' + region.join(',') + '/full/0/default.jpg'; | |
$('#urlArea').html( | |
'<a href="' + url + '" target=_blank>' + url + '</a>' | |
) | |
}); |
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<!DOCTYPE html> | |
<head> | |
<meta charset="utf-8"> | |
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" /> | |
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.1/dist/leaflet.css" /> | |
<link rel="stylesheet" href="https://rawgit.com/heyman/leaflet-areaselect/master/src/leaflet-areaselect.css" /> | |
<link rel="stylesheet" href="styles.css"> | |
<script src="https://unpkg.com/leaflet@1.3.1/dist/leaflet.js"></script> | |
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> | |
<script src="https://cdn.rawgit.com/mejackreed/Leaflet-IIIF/v1.2.2/leaflet-iiif.js"></script> | |
<script src="https://cdn.rawgit.com/heyman/leaflet-areaselect/da8905695db78354ddd5b5d9de6ef13699b9d7a7/src/leaflet-areaselect.js"></script> | |
</head> | |
<body> | |
<div id="map"></div> | |
<div id="urlArea"></div> | |
<script src="app.js"></script> | |
</body> | |
</html> |
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MIT License | |
Copyright (c) 2016 Jack Reed | |
Permission is hereby granted, free of charge, to any person obtaining a copy | |
of this software and associated documentation files (the "Software"), to deal | |
in the Software without restriction, including without limitation the rights | |
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
copies of the Software, and to permit persons to whom the Software is | |
furnished to do so, subject to the following conditions: | |
The above copyright notice and this permission notice shall be included in all | |
copies or substantial portions of the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
SOFTWARE. |
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html, body, #map{ | |
height: 100%; | |
margin: 0; | |
} | |
.leaflet-areaselect-container { | |
position:absolute; | |
width:100%; | |
height:100%; | |
} | |
#urlArea { | |
background-color: rgba(255, 255, 255, 0.5); | |
font-family: sans-serif; | |
position: absolute; | |
top: 0px; | |
left: 50%; | |
z-index: 100000; | |
} |
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