mirror of
https://github.com/openseadragon/openseadragon.git
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98 lines
2.9 KiB
JavaScript
98 lines
2.9 KiB
JavaScript
(function( $ ){
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/**
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* A tilesource implementation for Tiled Map Services (TMS). Adopted from Rainer Simon
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* project http://github.com/rsimon/seajax-utils. TMS tile
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* scheme ( [ as supported by OpenLayers ] is described here
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* ( http://openlayers.org/dev/examples/tms.html ) )
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*
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* @class
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* @extends OpenSeadragon.TileSource
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* @param {Number|Object} width - the pixel width of the image or the idiomatic
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* options object which is used instead of positional arguments.
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* @param {Number} height
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* @param {Number} tileSize
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* @param {Number} tileOverlap
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* @param {String} tilesUrl
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*/
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$.TmsTileSource = function( width, height, tileSize, tileOverlap, tilesUrl ) {
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var options;
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if( $.isPlainObject( width ) ){
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options = width;
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}else{
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options = {
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width: arguments[0],
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height: arguments[1],
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tileSize: arguments[2],
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tileOverlap: arguments[3],
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tilesUrl: arguments[4]
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};
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}
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// TMS has integer multiples of 256 for width/height and adds buffer
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// if necessary -> account for this!
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var bufferedWidth = Math.ceil(options.width / 256) * 256,
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bufferedHeight = Math.ceil(options.height / 256) * 256,
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max;
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// Compute number of zoomlevels in this tileset
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if (bufferedWidth > bufferedHeight) {
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max = bufferedWidth / 256;
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} else {
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max = bufferedHeight / 256;
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}
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options.maxLevel = Math.ceil(Math.log(max)/Math.log(2)) - 1;
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options.tileSize = 256;
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options.width = bufferedWidth;
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options.height = bufferedHeight;
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$.TileSource.apply( this, [ options ] );
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};
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$.extend( $.TmsTileSource.prototype, $.TileSource.prototype, {
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/**
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* Determine if the data and/or url imply the image service is supported by
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* this tile source.
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* @function
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* @name OpenSeadragon.TmsTileSource.prototype.supports
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* @param {Object|Array} data
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* @param {String} optional - url
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*/
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supports: function( data, url ){
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return ( data.type && "tiledmapservice" == data.type );
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},
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/**
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*
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* @function
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* @name OpenSeadragon.TmsTileSource.prototype.configure
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* @param {Object} data - the raw configuration
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* @param {String} url - the url the data was retreived from if any.
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* @return {Object} options - A dictionary of keyword arguments sufficient
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* to configure this tile sources constructor.
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*/
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configure: function( data, url ){
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return data;
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},
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/**
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* @function
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* @name OpenSeadragon.TmsTileSource.prototype.getTileUrl
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* @param {Number} level
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* @param {Number} x
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* @param {Number} y
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*/
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getTileUrl: function( level, x, y ) {
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// Convert from Deep Zoom definition to TMS zoom definition
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var yTiles = this.getNumTiles( level ).y - 1;
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return this.tilesUrl + level + "/" + x + "/" + (yTiles - y) + ".png";
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}
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});
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}( OpenSeadragon )); |