OpenLayers.Tile.Image

destroy: function()

nullify references to prevent circular references and memory leaks

draw: function()

Check that a tile should be drawn, and draw it.

Returns

{Boolean} Was a tile drawn?  Or null if a beforedraw listener returned false.

renderTile: function()

Internal function to actually initialize the image tile, position it correctly, and set its url.

positionTile: function()

Using the properties currenty set on the layer, position the tile correctly.  This method is used both by the async and non-async versions of the Tile.Image code.

clear: function()

Remove the tile from the DOM, clear it of any image related data so that it can be reused in a new location.

getImage: function()

Returns or creates and returns the tile image.

setImage: function( img )

Sets the image element for this tile.  This method should only be called from beforeload listeners.

Parameters img - {HTMLImageElement} The image to use for this tile.

initImage: function()

Creates the content for the frame on the tile.

setImgSrc: function( url )

Sets the source for the tile image

Parameters

getTile: function()

Get the tile’s markup.

Returns

{DOMElement} The tile’s markup

createBackBuffer: function()

Create a backbuffer for this tile.  A backbuffer isn’t exactly a clone of the tile’s markup, because we want to avoid the reloading of the image.  So we clone the frame, and steal the image from the tile.

Returns

{DOMElement} The markup, or undefined if the tile has no image or if it’s currently loading.

onImageLoad: function()

Handler for the image onload event

onImageError: function()

Handler for the image onerror event

stopLoading: function()

Stops a loading sequence so onImageLoad won’t be executed.

getCanvasContext: function()

Returns a canvas context associated with the tile image (with the image drawn on it).  Returns undefined if the browser does not support canvas, if the tile has no image or if it’s currently loading.

The function returns a canvas context instance but the underlying canvas is still available in the ‘canvas’ property:

var context = tile.getCanvasContext();
if (context) {
    var data = context.canvas.toDataURL('image/jpeg');
}

Returns

{Boolean}