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/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
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* text of the license. */
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/*
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* @class
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*
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* This is a class designed to designate a single tile, however
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* it is explicitly designed to do relatively little. Tiles store information
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* about themselves -- such as the URL that they are related to, and their
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* size - but do not add themselves to the layer div automatically, for
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* example.
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*/
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OpenLayers.Tile = Class.create();
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OpenLayers.Tile.prototype = {
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/** @type String */
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id: null,
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/** @type OpenLayers.Layer */
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layer: null,
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/** @type String url of the request */
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url:null,
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/** @type OpenLayers.Bounds */
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bounds:null,
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/** @type OpenLayers.Size */
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size:null,
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/** Top Left pixel of the tile
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* @type OpenLayers.Pixel */
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position:null,
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/** @type Boolean */
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drawn: false,
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/**
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* @constructor
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*
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* @param {OpenLayers.Layer} layer
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* @param {OpenLayers.Pixel} position
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* @param {OpenLayers.Bounds} bounds
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* @param {String} url
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* @param {OpenLayers.Size} size
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*/
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initialize: function(layer, position, bounds, url, size) {
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if (arguments.length > 0) {
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this.layer = layer;
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this.position = position;
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this.bounds = bounds;
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this.url = url;
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this.size = size;
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//give the tile a unique id based on its BBOX.
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this.id = OpenLayers.Util.createUniqueID("Tile_");
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}
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},
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/** nullify references to prevent circular references and memory leaks
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*/
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destroy:function() {
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this.layer = null;
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this.bounds = null;
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this.size = null;
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this.position = null;
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},
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/**
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*/
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draw:function() {
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this.drawn = true;
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},
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/**
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* @param {OpenLayers.Bounds}
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* @param {OpenLayers.pixel} position
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* @param {Boolean} redraw Redraw tile after moving?
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* Default is true
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*/
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moveTo: function (bounds, position, redraw) {
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if (redraw == null) {
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redraw = true;
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}
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this.clear();
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this.bounds = bounds.clone();
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this.position = position.clone();
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if (redraw) {
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this.draw();
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}
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},
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/** Clear the tile of any bounds/position-related data so that it can
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* be reused in a new location.
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*/
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clear: function() {
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this.drawn = false;
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},
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/** @final @type String */
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CLASS_NAME: "OpenLayers.Tile"
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};
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