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| var map; | |
| map = L.map('map', { | |
| center: [0, 0], | |
| crs: L.CRS.Simple, | |
| zoom: 0 | |
| }); | |
| var handle = document.getElementById('handle'), | |
| start = false, | |
| startTop; | |
| var overlay; | |
| $.getJSON('http://dms-data.stanford.edu/data/manifests/Stanford/qc810zp6213/manifest.json', function(data) { | |
| var mainImage = data.sequences[0].canvases[0].images[0].resource.default['@id'].replace('full/full/0/default.jpg', 'info.json'); | |
| var overlayImage = data.sequences[0].canvases[0].images[0].resource.item[0]['@id'].replace('full/full/0/default.jpg', 'info.json'); | |
| var main = L.tileLayer.iiif(mainImage).addTo(map); | |
| overlay = L.tileLayer.iiif(overlayImage, { | |
| opacity: 0.7, | |
| }); | |
| main.on('load', function() { | |
| overlay.addTo(map); | |
| }); | |
| overlay.on('load', function(){ | |
| overlay.bringToFront(); | |
| }); | |
| // Via https://www.mapbox.com/mapbox.js/example/v1.0.0/opacity/ | |
| document.onmousemove = function(e) { | |
| if (!start) return; | |
| // Adjust control. | |
| handle.style.top = Math.max(-5, Math.min(195, startTop + parseInt(e.clientY, 10) - start)) + 'px'; | |
| // Adjust opacity. | |
| overlay.setOpacity(1 - (handle.offsetTop / 200)); | |
| }; | |
| handle.onmousedown = function(e) { | |
| // Record initial positions. | |
| start = parseInt(e.clientY, 10); | |
| startTop = handle.offsetTop - 5; | |
| return false; | |
| }; | |
| document.onmouseup = function(e) { | |
| start = null; | |
| }; | |
| }); |
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| <!DOCTYPE html> | |
| <head> | |
| <link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.3/dist/leaflet.css" /> | |
| <link rel="stylesheet" href="styles.css"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" /> | |
| <script src="https://unpkg.com/leaflet@1.3.3/dist/leaflet.js"></script> | |
| <script src="//ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> | |
| <script src="https://cdn.rawgit.com/mejackreed/Leaflet-IIIF/v2.0.1/leaflet-iiif.js"></script> | |
| </head> | |
| <body> | |
| <div id="map"></div> | |
| <div id='control' class='ui-opacity'> | |
| <div id='handle' class='handle'></div> | |
| </div> | |
| <script src="app.js"></script> | |
| </body> | |
| </html> |
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| html, body, #map{ | |
| height: 100%; | |
| margin: 0; | |
| } | |
| .ui-opacity { | |
| background:#FFF; | |
| position:absolute; | |
| left:10px; | |
| top:70px; | |
| height:200px; | |
| width:28px; | |
| border:1px solid rgba(0,0,0,0.4); | |
| border-radius:3px; | |
| z-index:1000; | |
| } | |
| .ui-opacity .handle { | |
| position:absolute; | |
| background:#404040; | |
| left:0; | |
| top:60px; | |
| width:26px; | |
| height:10px; | |
| border-radius:1px; | |
| cursor:pointer; | |
| cursor:ns-resize; | |
| } | |
| .ui-opacity .handle:hover { | |
| background:#303030; | |
| } |
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