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demo.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>OpenSeadragon Fabricjs Overlay Demo</title>
<!-- <script src="openseadragon/openseadragon.js"></script> -->
<script src="openseadragon/osd-3.0.0/openseadragon.min.js"></script>
<script src="openseadragon-fabricjs-overlay.js"></script>
<script src="//code.jquery.com/jquery-3.6.0.min.js"></script>
<!-- <script src="fabric/fabric.adapted.js"></script> -->
<script src="fabric/fabric-4.4.0.min.js"></script>
<style>
html,
body,
.openseadragon1 {
width: 100%;
height: 100%;
margin: 0;
}
</style>
<script>
// ----------
App = {
// ----------
init() {
let self = this;
let tileSource = {
Image: {
xmlns: 'http://schemas.microsoft.com/deepzoom/2008',
Url: 'http://openseadragon.github.io/example-images/highsmith/highsmith_files/',
Format: 'jpg',
Overlap: '2',
TileSize: '256',
Size: {
Height: '9221',
Width: '7026'
}
}
};
let tileSourceIIIF = {
'@context': 'http://iiif.io/api/image/2/context.json',
'@id': 'https://libimages1.princeton.edu/loris/pudl0001%2F4609321%2Fs42%2F00000001.jp2',
height: 7200,
width: 5233,
profile: ['http://iiif.io/api/image/2/level2.json'],
protocol: 'http://iiif.io/api/image',
tiles: [{
scaleFactors: [1, 2, 4, 8, 16, 32],
width: 1024,
}]
};
this.viewer = OpenSeadragon({
id: 'contentDiv',
prefixUrl: 'openseadragon/images/',
tileSources: [{
tileSource,
width: 1,
y: 0,
x: 0,
},
{
tileSource: tileSourceIIIF,
width: 1,
y: 0,
x: 1.1
}],
});
// Initialize overlay
let options = {
scale: 1000
};
let overlay = this.viewer.fabricjsOverlay(options);
// Add fabric rectangle
let rect = new fabric.Rect({
left: 0,
top: 0,
fill: 'red',
width: 200,
height: 200
});
overlay.fabricCanvas().add(rect);
// Add fabric circle
let circle = new fabric.Circle({
left: 1500,
top: 0,
fill: 'green',
radius: 100,
selectable: true,
action: 'gravity'
});
overlay.fabricCanvas().add(circle);
// Create circle falling animation
circle.animate('top', '+=1200', {
onChange: overlay.fabricCanvas().renderAll.bind(overlay.fabricCanvas()),
duration: 2000,
easing: fabric.util.ease.easeOutBounce
});
circle.animate('scaleY', '-=.1', {
onChange: overlay.fabricCanvas().renderAll.bind(overlay.fabricCanvas()),
duration: 1000
});
// Check value
function isRealValue(obj) {
return obj && obj !== 'null' && obj !== 'undefined';
}
/**
* Toggle button on and off
*/
function btnDraw(flag, over, shape, txt) {
// Toggle fabric canvas draw
if (flag) {
// Disable OSD mouse events
self.viewer.setMouseNavEnabled(false);
self.viewer.outerTracker.setTracking(false);
// Activate fabric free-drawing mode
over.fabricCanvas().isDrawingMode = true;
// Button
shape.set('fill', 'lightgreen');
txt.text = 'Draw';
txt.left = 990;
over.fabricCanvas().add(txt);
} else {
// Stop drawing & switch back to zoom
// Add tracking back to OSD
self.viewer.setMouseNavEnabled(true);
self.viewer.outerTracker.setTracking(true);
// Disable free-drawing mode
over.fabricCanvas().isDrawingMode = false;
// Button
shape.set('fill', 'lightgray');
over.fabricCanvas().add(shape);
txt.text = 'Start\n drawing';
txt.left = 950;
over.fabricCanvas().add(txt);
}
}
overlay.fabricCanvas().on('mouse:up', event => {
if (isRealValue(event.target)) {
if (event.target.type === 'path') {
btnDraw(false, overlay, circle2, text);
}
// Animate circle on mouse release (try to drag circle up)
if (event.target.action === 'gravity') {
let delta = overlay.fabricCanvas().height - event.target.top;
if (delta > 0) {
circle.animate('top', `+=${delta + 420}`, {
onChange: overlay.fabricCanvas().renderAll.bind(overlay.fabricCanvas()),
duration: 2000,
easing: fabric.util.ease.easeOutBounce,
});
circle.animate('scaleY', '-=.1', {
onChange: overlay.fabricCanvas().renderAll.bind(overlay.fabricCanvas()),
duration: 1000,
});
}
}
} else {
btnDraw(false, overlay, circle2, text);
}
});
// Add fabric circle with text
let circle2 = new fabric.Circle({
left: 930,
top: 100,
fill: 'lightgray',
radius: 120,
selectable: false,
action: 'button'
});
overlay.fabricCanvas().add(circle2);
let text = new fabric.Text('Start\n drawing', {
left: 950,
top: 150,
fontSize: 50,
fontFamily: 'Helvetica',
textAlign: 'center',
fill: 'black',
selectable: false,
action: 'button'
});
overlay.fabricCanvas().add(text);
overlay.fabricCanvas().freeDrawingBrush.color = 'red';
overlay.fabricCanvas().freeDrawingBrush.width = 30;
// Start free-drawing mode
overlay.fabricCanvas().on('mouse:down', event => {
if (isRealValue(event.target)) {
if (event.target.action === 'button') {
btnDraw(true, overlay, circle2, text);
}
}
});
}
};
// ----------
$(document).ready(() => {
App.init();
});
</script>
</head>
<body>
<div id="contentDiv" class="openseadragon1"></div>
</body>
</html>