73 lines
1.8 KiB
JavaScript
73 lines
1.8 KiB
JavaScript
goog.provide('ol.tilegrid.Zoomify');
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goog.require('goog.math');
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goog.require('ol.TileCoord');
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goog.require('ol.tilecoord');
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goog.require('ol.tilegrid.TileGrid');
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/**
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* @classdesc
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* Set the grid pattern for sources accessing Zoomify tiled-image servers.
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*
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* @constructor
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* @extends {ol.tilegrid.TileGrid}
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* @param {olx.tilegrid.ZoomifyOptions=} opt_options Options.
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* @api
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*/
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ol.tilegrid.Zoomify = function(opt_options) {
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var options = goog.isDef(opt_options) ? opt_options : options;
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/** @type {Array.<ol.TileRange>} */
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var tileRangeByZ = goog.isDef(options.extent) ? [] : null;
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/**
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* @param {ol.TileCoord} tileCoord Tile coordinate.
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* @param {ol.TileCoord=} opt_tileCoord Destination tile coordinate.
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* @return {ol.TileCoord} Tile coordinate.
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*/
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function transformTileCoord(tileCoord, opt_tileCoord) {
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var z = tileCoord[0];
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if (z < minZ || maxZ < z) {
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return null;
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}
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var n = Math.pow(2, z);
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var x = tileCoord[1];
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if (x < 0 || n <= x) {
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return null;
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}
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var y = tileCoord[2];
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if (y < -n || -1 < y) {
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return null;
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}
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if (!goog.isNull(tileRangeByZ)) {
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if (!tileRangeByZ[z].containsXY(x, -y - 1)) {
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return null;
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}
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}
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return ol.tilecoord.createOrUpdate(z, x, -y - 1, opt_tileCoord);
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}
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goog.base(this, {
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origin: [0, 0],
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resolutions: options.resolutions,
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transformTileCoord: transformTileCoord
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});
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if (goog.isDef(options.extent)) {
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var minZ = this.minZoom;
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var maxZ = this.maxZoom;
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tileRangeByZ = [];
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var z;
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for (z = 0; z <= maxZ; ++z) {
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if (z < minZ) {
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tileRangeByZ[z] = null;
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} else {
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tileRangeByZ[z] = this.getTileRangeForExtentAndZ(options.extent, z);
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}
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}
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}
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};
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goog.inherits(ol.tilegrid.Zoomify, ol.tilegrid.TileGrid);
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