419abc8b4a
git-svn-id: http://svn.openlayers.org/tags/openlayers/release-2.4@3198 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
140 lines
4.1 KiB
JavaScript
140 lines
4.1 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/release-license.txt
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* for the full text of the license. */
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/*
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* @class
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* @requires OpenLayers/Util.js
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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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* TBD 3.0 - remove reference to url in above paragraph
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*
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*/
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OpenLayers.Tile = OpenLayers.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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/** TBD 3.0
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* @deprecated The base tile class does not need an url. This should be
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* handled in subclasses. Does not belong here.
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*
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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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/** TBD 3.0 -- remove 'url' from the list of parameters to the constructor.
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* there is no need for the base tile class to have a url.
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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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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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/** 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.clear();
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return ((this.layer.displayOutsideMaxExtent
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|| (this.layer.maxExtent
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&& this.bounds.intersectsBounds(this.layer.maxExtent, false)))
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&& !(this.layer.buffer == 0
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&& !this.bounds.intersectsBounds(this.layer.map.getExtent(), false)));
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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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getBoundsFromBaseLayer: function(position) {
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var topLeft = this.layer.map.getLonLatFromLayerPx(position);
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var bottomRightPx = position.clone();
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bottomRightPx.x += this.size.w;
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bottomRightPx.y += this.size.h;
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var bottomRight = this.layer.map.getLonLatFromLayerPx(bottomRightPx);
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// Handle the case where the base layer wraps around the date line.
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// Google does this, and it breaks WMS servers to request bounds in that fashion.
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if (topLeft.lon > bottomRight.lon) {
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if (topLeft.lon < 0) {
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topLeft.lon = -180 - (topLeft.lon+180);
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} else {
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bottomRight.lon = 180+bottomRight.lon+180;
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}
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}
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bounds = new OpenLayers.Bounds(topLeft.lon, bottomRight.lat, bottomRight.lon, topLeft.lat);
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return bounds;
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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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