87 lines
2.7 KiB
JavaScript
87 lines
2.7 KiB
JavaScript
// FIXME add minZoom support
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goog.provide('ol.source.TiledWMS');
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goog.require('goog.array');
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goog.require('goog.math');
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goog.require('ol.Extent');
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goog.require('ol.TileCoord');
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goog.require('ol.TileUrlFunction');
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goog.require('ol.source.ImageTileSource');
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goog.require('ol.source.wms');
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/**
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* @constructor
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* @extends {ol.source.ImageTileSource}
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* @param {ol.source.TiledWMSOptions} options Tiled WMS options.
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*/
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ol.source.TiledWMS = function(options) {
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var tileGrid;
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if (goog.isDef(options.tileGrid)) {
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tileGrid = options.tileGrid;
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}
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var tileUrlFunction = ol.TileUrlFunction.nullTileUrlFunction;
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var urls = options.urls;
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if (!goog.isDef(urls) && goog.isDef(options.url)) {
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urls = ol.TileUrlFunction.expandUrl(options.url);
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}
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if (goog.isDef(urls)) {
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var tileUrlFunctions = goog.array.map(
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urls, function(url) {
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return ol.TileUrlFunction.createFromParamsFunction(
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url, options.params, ol.source.wms.getUrl);
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});
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tileUrlFunction = ol.TileUrlFunction.createFromTileUrlFunctions(
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tileUrlFunctions);
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}
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var transparent = goog.isDef(options.params['TRANSPARENT']) ?
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options.params['TRANSPARENT'] : true;
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var extent = options.extent;
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var tileCoordTransform = function(tileCoord, projection) {
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var tileGrid = this.getTileGrid();
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if (goog.isNull(tileGrid)) {
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tileGrid = ol.tilegrid.getForProjection(projection);
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}
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if (tileGrid.getResolutions().length <= tileCoord.z) {
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return null;
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}
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var x = tileCoord.x;
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var tileExtent = tileGrid.getTileCoordExtent(tileCoord);
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var projectionExtent = projection.getExtent();
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extent = goog.isDef(extent) ? extent : projectionExtent;
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if (!goog.isNull(extent) && projection.isGlobal() &&
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extent.minX === projectionExtent.minX &&
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extent.maxX === projectionExtent.maxX) {
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var numCols = Math.ceil(
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(extent.maxX - extent.minX) / (tileExtent.maxX - tileExtent.minX));
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x = goog.math.modulo(x, numCols);
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tileExtent = tileGrid.getTileCoordExtent(
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new ol.TileCoord(tileCoord.z, x, tileCoord.y));
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}
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// FIXME We shouldn't need a typecast here.
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if (!tileExtent.intersects(/** @type {ol.Extent} */ (extent))) {
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return null;
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}
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return new ol.TileCoord(tileCoord.z, x, tileCoord.y);
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};
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goog.base(this, {
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attributions: options.attributions,
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crossOrigin: options.crossOrigin,
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extent: extent,
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tileGrid: options.tileGrid,
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opaque: !transparent,
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projection: options.projection,
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tileUrlFunction: ol.TileUrlFunction.withTileCoordTransform(
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tileCoordTransform, tileUrlFunction)
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});
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};
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goog.inherits(ol.source.TiledWMS, ol.source.ImageTileSource);
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