L.Class powers the OOP facilities of Leaflet and is used to create almost all of the Leaflet classes documented.
Instantiates an image overlay object given the URL of the image and the geographical bounds it is tied to.
Adds the overlay to the map.
Brings the layer to the bottom of all overlays.
Brings the layer to the top of all overlays.
Should contain code that creates DOM elements for the overlay, adds them to map panes where they should belong and puts listeners on relevant map events. Called on map.addLayer(layer).
Should contain all clean up code that removes the overlay's elements from the DOM and removes listeners previously added in onAdd. Called on map.removeLayer(layer).
Sets the opacity of the overlay.