Code coverage report for src/layer/ImageOverlay.js

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All files » src/layer/ » ImageOverlay.js
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/*
 * L.ImageOverlay is used to overlay images over the map (to specific geographical bounds).
 */
 
L.ImageOverlay = L.Class.extend({
	includes: L.Mixin.Events,
 
	options: {
		opacity: 1
	},
 
	initialize: function (url, bounds, options) { // (String, LatLngBounds, Object)
		this._url = url;
		this._bounds = L.latLngBounds(bounds);
 
		L.setOptions(this, options);
	},
 
	onAdd: function (map) {
		this._map = map;
 
		if (!this._image) {
			this._initImage();
		}
 
		map._panes.overlayPane.appendChild(this._image);
 
		map.on('viewreset', this._reset, this);
 
		if (map.options.zoomAnimation && L.Browser.any3d) {
			map.on('zoomanim', this._animateZoom, this);
		}
 
		this._reset();
	},
 
	onRemove: function (map) {
		map.getPanes().overlayPane.removeChild(this._image);
 
		map.off('viewreset', this._reset, this);
 
		if (map.options.zoomAnimation) {
			map.off('zoomanim', this._animateZoom, this);
		}
	},
 
	addTo: function (map) {
		map.addLayer(this);
		return this;
	},
 
	setOpacity: function (opacity) {
		this.options.opacity = opacity;
		this._updateOpacity();
		return this;
	},
 
	// TODO remove bringToFront/bringToBack duplication from TileLayer/Path
	bringToFront: function () {
		if (this._image) {
			this._map._panes.overlayPane.appendChild(this._image);
		}
		return this;
	},
 
	bringToBack: function () {
		var pane = this._map._panes.overlayPane;
		if (this._image) {
			pane.insertBefore(this._image, pane.firstChild);
		}
		return this;
	},
 
	_initImage: function () {
		this._image = L.DomUtil.create('img', 'leaflet-image-layer');
 
		if (this._map.options.zoomAnimation && L.Browser.any3d) {
			L.DomUtil.addClass(this._image, 'leaflet-zoom-animated');
		} else {
			L.DomUtil.addClass(this._image, 'leaflet-zoom-hide');
		}
 
		this._updateOpacity();
 
		//TODO createImage util method to remove duplication
		L.extend(this._image, {
			galleryimg: 'no',
			onselectstart: L.Util.falseFn,
			onmousemove: L.Util.falseFn,
			onload: L.bind(this._onImageLoad, this),
			src: this._url
		});
	},
 
	_animateZoom: function (e) {
		var map = this._map,
		    image = this._image,
		    scale = map.getZoomScale(e.zoom),
		    nw = this._bounds.getNorthWest(),
		    se = this._bounds.getSouthEast(),
 
		    topLeft = map._latLngToNewLayerPoint(nw, e.zoom, e.center),
		    size = map._latLngToNewLayerPoint(se, e.zoom, e.center)._subtract(topLeft),
		    origin = topLeft._add(size._multiplyBy((1 / 2) * (1 - 1 / scale)));
 
		image.style[L.DomUtil.TRANSFORM] =
		        L.DomUtil.getTranslateString(origin) + ' scale(' + scale + ') ';
	},
 
	_reset: function () {
		var image   = this._image,
		    topLeft = this._map.latLngToLayerPoint(this._bounds.getNorthWest()),
		    size = this._map.latLngToLayerPoint(this._bounds.getSouthEast())._subtract(topLeft);
 
		L.DomUtil.setPosition(image, topLeft);
 
		image.style.width  = size.x + 'px';
		image.style.height = size.y + 'px';
	},
 
	_onImageLoad: function () {
		this.fire('load');
	},
 
	_updateOpacity: function () {
		L.DomUtil.setOpacity(this._image, this.options.opacity);
	}
});
 
L.imageOverlay = function (url, bounds, options) {
	return new L.ImageOverlay(url, bounds, options);
};