0ba7961df4
improvements in the form of reduced memory use and lower element creating costs, hopefully making the OpenLayers code more usable in internet explorer as well as less of a memory hog in Firefox and other browsers. Additionally, a buffer is available around the main map grid which allows tiles to be loaded outside of the viewing area for faster dragging. git-svn-id: http://svn.openlayers.org/trunk/openlayers@1137 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
103 lines
2.5 KiB
JavaScript
103 lines
2.5 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
|
|
* See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
|
|
* text of the license. */
|
|
/*
|
|
* OpenLayers.Tile
|
|
*
|
|
* @class This is a class designed to designate a single tile, however
|
|
* it is explicitly designed to do relatively little. Tiles store information
|
|
* about themselves -- such as the URL that they are related to, and their
|
|
* size - but do not add themselves to the layer div automatically, for
|
|
* example.
|
|
*/
|
|
OpenLayers.Tile = Class.create();
|
|
OpenLayers.Tile.prototype = {
|
|
|
|
/** @type String */
|
|
id: null,
|
|
|
|
/** @type OpenLayers.Layer */
|
|
layer: null,
|
|
|
|
/** @type String url of the request */
|
|
url:null,
|
|
|
|
/** @type OpenLayers.Bounds */
|
|
bounds:null,
|
|
|
|
/** @type OpenLayers.Size */
|
|
size:null,
|
|
|
|
/** Top Left pixel of the tile
|
|
* @type OpenLayers.Pixel */
|
|
position:null,
|
|
|
|
/**
|
|
* @constructor
|
|
*
|
|
* @param {OpenLayers.Layer} layer
|
|
* @param {OpenLayers.Pixel} position
|
|
* @param {OpenLayers.Bounds} bounds
|
|
* @param {String} url
|
|
* @param {OpenLayers.Size} size
|
|
*/
|
|
initialize: function(layer, position, bounds, url, size) {
|
|
if (arguments.length > 0) {
|
|
this.layer = layer;
|
|
this.position = position;
|
|
this.bounds = bounds;
|
|
this.url = url;
|
|
this.size = size;
|
|
|
|
//give the tile a unique id based on its BBOX.
|
|
this.id = OpenLayers.Util.createUniqueID("Tile_");
|
|
}
|
|
},
|
|
|
|
/** nullify references to prevent circular references and memory leaks
|
|
*/
|
|
destroy:function() {
|
|
this.layer = null;
|
|
this.bounds = null;
|
|
this.size = null;
|
|
},
|
|
|
|
/**
|
|
*/
|
|
draw:function() {
|
|
|
|
// HACK HACK - should we make it a standard to put this sort of warning
|
|
// message in functions that are supposed to be overridden?
|
|
//
|
|
// Log.warn(this.CLASS_NAME + ": draw() not implemented");
|
|
|
|
},
|
|
|
|
redraw: function () {
|
|
this.draw();
|
|
},
|
|
|
|
moveTo: function (bounds, position) {
|
|
this.bounds = bounds.clone();
|
|
this.position = position.clone();
|
|
this.redraw();
|
|
},
|
|
|
|
|
|
/** remove this tile from the ds
|
|
*/
|
|
remove:function() {
|
|
},
|
|
|
|
/**
|
|
* @type OpenLayers.Pixel
|
|
*/
|
|
getPosition: function() {
|
|
return this.position;
|
|
},
|
|
|
|
/** @final @type String */
|
|
CLASS_NAME: "OpenLayers.Tile"
|
|
};
|
|
|