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LayerAnnotation.js.html
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<!DOCTYPE html>
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<title>OpenLIMEs Source: LayerAnnotation.js</title>
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Fired when the layout is ready for rendering.
This occurs when:
- Tile descriptors are loaded from annotation file
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Fired when the layout size changes and scene extension needs updating.
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<h1 class="page-title">Source: LayerAnnotation.js</h1>
<section>
<article>
<pre
class="sunlight-highlight-javascript linenums">import { Annotation } from './Annotation.js';
import { Layer } from './Layer.js'
import { addSignals } from './Signals.js';
/**
* @typedef {Object} LayerAnnotationOptions
* @property {string} [style] - CSS styles for annotation rendering
* @property {string|Annotation[]} [annotations=[]] - URL of JSON annotation data or array of annotations
* @property {boolean} [overlay=true] - Whether annotations render as overlay
* @property {Set<string>} [selected=new Set()] - Set of selected annotation IDs
* @property {Object} [annotationsListEntry=null] - UI entry for annotations list
* @extends LayerOptions
*/
/**
* LayerAnnotation provides functionality for displaying and managing annotations overlaid on other layers.
* It supports both local and remote annotation data, selection management, and UI integration.
*
* Features:
* - Display of text, graphics, and glyph annotations
* - Remote annotation loading via JSON/HTTP
* - Selection management
* - Visibility toggling per annotation
* - UI integration with annotation list
* - Annotation event handling
*
* The layer automatically handles:
* - Annotation data loading and parsing
* - UI synchronization
* - Visibility states
* - Selection states
* - Event propagation
*
* @extends Layer
* @fires LayerAnnotation#selected - Fired when annotation selection changes, with selected annotation as parameter
* @fires LayerAnnotation#loaded - Fired when annotations are loaded
* @fires Layer#update - Inherited from Layer, fired when redraw needed
* @fires Layer#ready - Inherited from Layer, fired when layer is ready
*
* @example
* ```javascript
* // Create annotation layer from remote JSON
* const annoLayer = new OpenLIME.LayerAnnotation({
* annotations: 'https://example.com/annotations.json',
* style: '.annotation { color: red; }',
* overlay: true
* });
*
* // Listen for selection changes
* annoLayer.addEvent('selected', (annotation) => {
* console.log('Selected annotation:', annotation.label);
* });
*
* // Add to viewer
* viewer.addLayer('annotations', annoLayer);
* ```
*/
class LayerAnnotation extends Layer { //FIXME CustomData Object template {name: { label: defaultValue: type:number,enum,string,boolean min: max: enum:[] }}
/**
* Instantiates a LayerAnnotation object.
* @param {Object} [options] An object literal with options that inherits from {@link Layer}.
* @param {string} options.style Properties to style annotations.
* @param {(string|Array)} options.annotations The URL of the annotation data (JSON file or HTTP GET Request to an annotation server) or an array of annotations.
*/
constructor(options) {
options = Object.assign({
// geometry: null, //unused, might want to store here the quads/shapes for opengl rendering
style: null, //straightforward for svg annotations, to be defined or opengl rendering
annotations: [],
selected: new Set,
overlay: true,
annotationsListEntry: null, //TODO: horrible name for the interface list of annotations
}, options);
super(options);
if (typeof (this.annotations) == "string") { //assumes it is an URL
(async () => { await this.loadAnnotations(this.annotations); })();
}
}
/**
* Loads annotations from a URL
* @param {string} url - URL to fetch annotations from (JSON format)
* @fires LayerAnnotation#loaded
* @fires Layer#update
* @fires Layer#ready
* @private
* @async
*/
async loadAnnotations(url) {
const headers = new Headers();
headers.append('pragma', 'no-cache');
headers.append('cache-control', 'no-cache');
var response = await fetch(url, {
method: 'GET',
headers: headers,
});
if (!response.ok) {
this.status = "Failed loading " + this.url + ": " + response.statusText;
return;
}
this.annotations = await response.json();
if (this.annotations.status == 'error') {
alert("Failed to load annotations: " + this.annotations.msg);
return;
}
//this.annotations = this.annotations.map(a => '@context' in a ? Annotation.fromJsonLd(a): a);
this.annotations = this.annotations.map(a => new Annotation(a));
for (let a of this.annotations)
if (a.publish != 1)
a.visible = false;
//this.annotations.sort((a, b) => a.label.localeCompare(b.label));
if (this.annotationsListEntry)
this.createAnnotationsList();
this.emit('update');
this.status = 'ready';
this.emit('ready');
this.emit('loaded');
}
/**
* Creates a new annotation and adds it to the layer
* @param {Annotation} [annotation] - Optional pre-configured annotation
* @returns {Annotation} The newly created annotation
* @private
*/
newAnnotation(annotation) {
if (!annotation)
annotation = new Annotation();
this.annotations.push(annotation);
let html = this.createAnnotationEntry(annotation);
let template = document.createElement('template');
template.innerHTML = html.trim();
let list = this.annotationsListEntry.element.parentElement.querySelector('.openlime-list');
list.appendChild(template.content.firstChild);
this.clearSelected();
//this.setSelected(annotation);
return annotation;
}
/**
* Creates the UI entry for the annotations list
* @returns {Object} Configuration object for annotations list UI
* @private
*/
annotationsEntry() {
return this.annotationsListEntry = {
html: '',
list: [], //will be filled later.
classes: 'openlime-annotations',
status: () => 'active',
oncreate: () => {
if (Array.isArray(this.annotations))
this.createAnnotationsList();
}
}
}
/**
* Creates the complete annotations list UI
* @private
*/
createAnnotationsList() {
let html = '';
for (let a of this.annotations) {
html += this.createAnnotationEntry(a);
}
let list = this.annotationsListEntry.element.parentElement.querySelector('.openlime-list');
list.innerHTML = html;
list.addEventListener('click', (e) => {
let svg = e.srcElement.closest('svg');
if (svg) {
let entry = svg.closest('[data-annotation]')
entry.classList.toggle('hidden');
let id = entry.getAttribute('data-annotation');
let anno = this.getAnnotationById(id);
anno.visible = !anno.visible;
anno.needsUpdate = true;
this.emit('update');
}
let id = e.srcElement.getAttribute('data-annotation');
if (id) {
this.clearSelected();
let anno = this.getAnnotationById(id);
this.setSelected(anno, true);
}
});
}
/**
* Creates a single annotation entry for the UI
* @param {Annotation} annotation - The annotation to create an entry for
* @returns {string} HTML string for the annotation entry
* @private
*/
createAnnotationEntry(a) {
return `<a href="#" data-annotation="${a.id}" class="openlime-entry ${a.visible == 0 ? 'hidden' : ''}">${a.label || ''}
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="openlime-eye"><path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z"></path><circle cx="12" cy="12" r="3"></circle></svg>
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="openlime-eye-off"><path d="M17.94 17.94A10.07 10.07 0 0 1 12 20c-7 0-11-8-11-8a18.45 18.45 0 0 1 5.06-5.94M9.9 4.24A9.12 9.12 0 0 1 12 4c7 0 11 8 11 8a18.5 18.5 0 0 1-2.16 3.19m-6.72-1.07a3 3 0 1 1-4.24-4.24"></path><line x1="1" y1="1" x2="23" y2="23"></line></svg>
</a>`;
}
/**
* Retrieves an annotation by its ID
* @param {string} id - Annotation identifier
* @returns {Annotation|null} The found annotation or null if not found
*/
getAnnotationById(id) {
for (const anno of this.annotations)
if (anno.id == id)
return anno;
return null;
}
/**
* Clears all annotation selections
* @private
*/
clearSelected() {
this.annotationsListEntry.element.parentElement.querySelectorAll(`[data-annotation]`).forEach((e) => e.classList.remove('selected'));
this.selected.clear();
}
/**
* Sets the selection state of an annotation
* @param {Annotation} anno - The annotation to select/deselect
* @param {boolean} [on=true] - Whether to select (true) or deselect (false)
* @fires LayerAnnotation#selected
*/
setSelected(anno, on = true) {
this.annotationsListEntry.element.parentElement.querySelector(`[data-annotation="${anno.id}"]`).classList.toggle('selected', on);
if (on)
this.selected.add(anno.id);
else
this.selected.delete(anno.id);
this.emit('selected', anno);
}
}
addSignals(LayerAnnotation, 'selected', 'loaded');
export { LayerAnnotation }
</pre>
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$( ".tutorial-section pre, .readme-section pre, pre.prettyprint.source" ).each( function () {
var $this = $( this );
var example = $this.find( "code" );
exampleText = example.html();
var lang = /{@lang (.*?)}/.exec( exampleText );
if ( lang && lang[1] ) {
exampleText = exampleText.replace( lang[0], "" );
example.html( exampleText );
lang = lang[1];
} else {
var langClassMatch = example.parent()[0].className.match(/lang\-(\S+)/);
lang = langClassMatch ? langClassMatch[1] : "javascript";
}
if ( lang ) {
$this
.addClass( "sunlight-highlight-" + lang )
.addClass( "linenums" )
.html( example.html() );
}
} );
Sunlight.highlightAll( {
lineNumbers : true,
showMenu : true,
enableDoclinks : true
} );
$.catchAnchorLinks( {
navbarOffset: 10
} );
$( "#toc" ).toc( {
anchorName : function ( i, heading, prefix ) {
return $( heading ).attr( "id" ) || ( prefix + i );
},
selectors : "#toc-content h1,#toc-content h2,#toc-content h3,#toc-content h4",
showAndHide : false,
smoothScrolling: true
} );
$( "#main span[id^='toc']" ).addClass( "toc-shim" );
$( '.dropdown-toggle' ).dropdown();
$( "table" ).each( function () {
var $this = $( this );
$this.addClass('table');
} );
} );
</script>
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