[76] | 1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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| 2 | * full list of contributors). Published under the Clear BSD license. |
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| 3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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| 4 | * full text of the license. */ |
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| 5 | |
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| 6 | /* |
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| 7 | * Development supported by a R&D grant DC08P02OUK006 - Old Maps Online |
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| 8 | * (www.oldmapsonline.org) from Ministry of Culture of the Czech Republic. |
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| 9 | */ |
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| 10 | |
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| 11 | |
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| 12 | /** |
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| 13 | * @requires OpenLayers/Layer/Grid.js |
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| 14 | */ |
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| 15 | |
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| 16 | /** |
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| 17 | * Class: OpenLayers.Layer.Zoomify |
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| 18 | * |
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| 19 | * Inherits from: |
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| 20 | * - <OpenLayers.Layer.Grid> |
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| 21 | */ |
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| 22 | OpenLayers.Layer.Zoomify = OpenLayers.Class(OpenLayers.Layer.Grid, { |
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| 23 | |
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| 24 | /** |
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| 25 | * Property: url |
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| 26 | * {String} URL for root directory with TileGroupX subdirectories. |
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| 27 | */ |
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| 28 | url: null, |
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| 29 | |
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| 30 | /** |
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| 31 | * Property: size |
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| 32 | * {<OpenLayers.Size>} The Zoomify image size in pixels. |
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| 33 | */ |
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| 34 | size: null, |
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| 35 | |
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| 36 | /** |
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| 37 | * APIProperty: isBaseLayer |
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| 38 | * {Boolean} |
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| 39 | */ |
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| 40 | isBaseLayer: true, |
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| 41 | |
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| 42 | /** |
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| 43 | * Property: standardTileSize |
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| 44 | * {Integer} The size of a standard (non-border) square tile in pixels. |
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| 45 | */ |
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| 46 | standardTileSize: 256, |
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| 47 | |
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| 48 | /** |
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| 49 | * Property: numberOfTiers |
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| 50 | * {Integer} Depth of the Zoomify pyramid, number of tiers (zoom levels) |
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| 51 | * - filled during Zoomify pyramid initialization. |
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| 52 | */ |
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| 53 | numberOfTiers: 0, |
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| 54 | |
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| 55 | /** |
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| 56 | * Property: tileCountUpToTier |
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| 57 | * {Array(Integer)} Number of tiles up to the given tier of pyramid. |
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| 58 | * - filled during Zoomify pyramid initialization. |
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| 59 | */ |
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| 60 | tileCountUpToTier: new Array(), |
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| 61 | |
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| 62 | /** |
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| 63 | * Property: tierSizeInTiles |
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| 64 | * {Array(<OpenLayers.Size>)} Size (in tiles) for each tier of pyramid. |
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| 65 | * - filled during Zoomify pyramid initialization. |
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| 66 | */ |
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| 67 | tierSizeInTiles: new Array(), |
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| 68 | |
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| 69 | /** |
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| 70 | * Property: tierImageSize |
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| 71 | * {Array(<OpenLayers.Size>)} Image size in pixels for each pyramid tier. |
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| 72 | * - filled during Zoomify pyramid initialization. |
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| 73 | */ |
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| 74 | tierImageSize: new Array(), |
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| 75 | |
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| 76 | /** |
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| 77 | * Constructor: OpenLayers.Layer.Zoomify |
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| 78 | * |
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| 79 | * Parameters: |
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| 80 | * name - {String} A name for the layer. |
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| 81 | * url - {String} - Relative or absolute path to the image or more |
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| 82 | * precisly to the TileGroup[X] directories root. |
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| 83 | * Flash plugin use the variable name "zoomifyImagePath" for this. |
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| 84 | * size - {<OpenLayers.Size>} The size (in pixels) of the image. |
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| 85 | * options - {Object} Hashtable of extra options to tag onto the layer |
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| 86 | */ |
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| 87 | initialize: function(name, url, size, options) { |
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| 88 | |
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| 89 | // initilize the Zoomify pyramid for given size |
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| 90 | this.initializeZoomify( size ); |
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| 91 | |
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| 92 | var newArguments = []; |
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| 93 | newArguments.push(name, url, size, {}, options); |
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| 94 | |
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| 95 | OpenLayers.Layer.Grid.prototype.initialize.apply(this, newArguments); |
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| 96 | }, |
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| 97 | |
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| 98 | /** |
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| 99 | * Method: initializeZoomify |
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| 100 | * It generates constants for all tiers of the Zoomify pyramid |
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| 101 | * |
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| 102 | * Parameters: |
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| 103 | * size - {<OpenLayers.Size>} The size of the image in pixels |
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| 104 | * |
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| 105 | */ |
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| 106 | initializeZoomify: function( size ) { |
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| 107 | |
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| 108 | var imageSize = size.clone() |
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| 109 | var tiles = new OpenLayers.Size( |
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| 110 | Math.ceil( imageSize.w / this.standardTileSize ), |
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| 111 | Math.ceil( imageSize.h / this.standardTileSize ) |
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| 112 | ); |
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| 113 | |
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| 114 | this.tierSizeInTiles.push( tiles ); |
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| 115 | this.tierImageSize.push( imageSize ); |
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| 116 | |
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| 117 | while (imageSize.w > this.standardTileSize || |
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| 118 | imageSize.h > this.standardTileSize ) { |
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| 119 | |
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| 120 | imageSize = new OpenLayers.Size( |
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| 121 | Math.floor( imageSize.w / 2 ), |
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| 122 | Math.floor( imageSize.h / 2 ) |
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| 123 | ); |
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| 124 | tiles = new OpenLayers.Size( |
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| 125 | Math.ceil( imageSize.w / this.standardTileSize ), |
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| 126 | Math.ceil( imageSize.h / this.standardTileSize ) |
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| 127 | ); |
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| 128 | this.tierSizeInTiles.push( tiles ); |
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| 129 | this.tierImageSize.push( imageSize ); |
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| 130 | } |
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| 131 | |
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| 132 | this.tierSizeInTiles.reverse(); |
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| 133 | this.tierImageSize.reverse(); |
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| 134 | |
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| 135 | this.numberOfTiers = this.tierSizeInTiles.length; |
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| 136 | |
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| 137 | this.tileCountUpToTier[0] = 0; |
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| 138 | for (var i = 1; i < this.numberOfTiers; i++) { |
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| 139 | this.tileCountUpToTier.push( |
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| 140 | this.tierSizeInTiles[i-1].w * this.tierSizeInTiles[i-1].h + |
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| 141 | this.tileCountUpToTier[i-1] |
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| 142 | ); |
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| 143 | } |
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| 144 | }, |
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| 145 | |
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| 146 | /** |
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| 147 | * APIMethod:destroy |
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| 148 | */ |
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| 149 | destroy: function() { |
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| 150 | // for now, nothing special to do here. |
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| 151 | OpenLayers.Layer.Grid.prototype.destroy.apply(this, arguments); |
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| 152 | |
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| 153 | // Remove from memory the Zoomify pyramid - is that enough? |
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| 154 | this.tileCountUpToTier.length = 0 |
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| 155 | this.tierSizeInTiles.length = 0 |
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| 156 | this.tierImageSize.length = 0 |
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| 157 | |
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| 158 | }, |
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| 159 | |
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| 160 | /** |
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| 161 | * APIMethod: clone |
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| 162 | * |
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| 163 | * Parameters: |
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| 164 | * obj - {Object} |
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| 165 | * |
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| 166 | * Returns: |
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| 167 | * {<OpenLayers.Layer.Zoomify>} An exact clone of this <OpenLayers.Layer.Zoomify> |
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| 168 | */ |
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| 169 | clone: function (obj) { |
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| 170 | |
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| 171 | if (obj == null) { |
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| 172 | obj = new OpenLayers.Layer.Zoomify(this.name, |
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| 173 | this.url, |
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| 174 | this.size, |
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| 175 | this.options); |
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| 176 | } |
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| 177 | |
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| 178 | //get all additions from superclasses |
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| 179 | obj = OpenLayers.Layer.Grid.prototype.clone.apply(this, [obj]); |
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| 180 | |
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| 181 | // copy/set any non-init, non-simple values here |
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| 182 | |
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| 183 | return obj; |
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| 184 | }, |
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| 185 | |
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| 186 | /** |
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| 187 | * Method: getURL |
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| 188 | * |
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| 189 | * Parameters: |
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| 190 | * bounds - {<OpenLayers.Bounds>} |
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| 191 | * |
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| 192 | * Returns: |
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| 193 | * {String} A string with the layer's url and parameters and also the |
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| 194 | * passed-in bounds and appropriate tile size specified as |
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| 195 | * parameters |
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| 196 | */ |
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| 197 | getURL: function (bounds) { |
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| 198 | bounds = this.adjustBounds(bounds); |
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| 199 | var res = this.map.getResolution(); |
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| 200 | var x = Math.round((bounds.left - this.tileOrigin.lon) / (res * this.tileSize.w)); |
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| 201 | var y = Math.round((this.tileOrigin.lat - bounds.top) / (res * this.tileSize.h)); |
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| 202 | var z = this.map.getZoom(); |
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| 203 | |
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| 204 | var tileIndex = x + y * this.tierSizeInTiles[z].w + this.tileCountUpToTier[z]; |
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| 205 | var path = "TileGroup" + Math.floor( (tileIndex) / 256 ) + |
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| 206 | "/" + z + "-" + x + "-" + y + ".jpg"; |
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| 207 | var url = this.url; |
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| 208 | if (url instanceof Array) { |
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| 209 | url = this.selectUrl(path, url); |
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| 210 | } |
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| 211 | return url + path; |
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| 212 | }, |
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| 213 | |
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| 214 | /** |
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| 215 | * Method: getImageSize |
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| 216 | * getImageSize returns size for a particular tile. If bounds are given as |
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| 217 | * first argument, size is calculated (bottom-right tiles are non square). |
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| 218 | * |
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| 219 | */ |
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| 220 | getImageSize: function() { |
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| 221 | if (arguments.length > 0) { |
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| 222 | bounds = this.adjustBounds(arguments[0]); |
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| 223 | var res = this.map.getResolution(); |
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| 224 | var x = Math.round((bounds.left - this.tileOrigin.lon) / (res * this.tileSize.w)); |
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| 225 | var y = Math.round((this.tileOrigin.lat - bounds.top) / (res * this.tileSize.h)); |
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| 226 | var z = this.map.getZoom(); |
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| 227 | var w = this.standardTileSize; |
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| 228 | var h = this.standardTileSize; |
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| 229 | if (x == this.tierSizeInTiles[z].w -1 ) { |
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| 230 | var w = this.tierImageSize[z].w % this.standardTileSize; |
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| 231 | }; |
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| 232 | if (y == this.tierSizeInTiles[z].h -1 ) { |
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| 233 | var h = this.tierImageSize[z].h % this.standardTileSize; |
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| 234 | }; |
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| 235 | return (new OpenLayers.Size(w, h)); |
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| 236 | } else { |
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| 237 | return this.tileSize; |
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| 238 | } |
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| 239 | }, |
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| 240 | |
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| 241 | /** |
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| 242 | * Method: addTile |
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| 243 | * addTile creates a tile, initializes it, and adds it to the layer div. |
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| 244 | * |
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| 245 | * Parameters: |
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| 246 | * bounds - {<OpenLayers.Bounds>} |
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| 247 | * position - {<OpenLayers.Pixel>} |
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| 248 | * |
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| 249 | * Returns: |
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| 250 | * {<OpenLayers.Tile.Image>} The added OpenLayers.Tile.Image |
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| 251 | */ |
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| 252 | addTile:function(bounds,position) { |
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| 253 | return new OpenLayers.Tile.Image(this, position, bounds, |
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| 254 | null, this.tileSize); |
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| 255 | }, |
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| 256 | |
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| 257 | /** |
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| 258 | * APIMethod: setMap |
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| 259 | * When the layer is added to a map, then we can fetch our origin |
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| 260 | * (if we don't have one.) |
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| 261 | * |
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| 262 | * Parameters: |
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| 263 | * map - {<OpenLayers.Map>} |
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| 264 | */ |
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| 265 | setMap: function(map) { |
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| 266 | OpenLayers.Layer.Grid.prototype.setMap.apply(this, arguments); |
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| 267 | this.tileOrigin = new OpenLayers.LonLat(this.map.maxExtent.left, |
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| 268 | this.map.maxExtent.top); |
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| 269 | }, |
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| 270 | |
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| 271 | /** |
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| 272 | * Method: calculateGridLayout |
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| 273 | * Generate parameters for the grid layout. This |
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| 274 | * |
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| 275 | * Parameters: |
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| 276 | * bounds - {<OpenLayers.Bound>} |
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| 277 | * extent - {<OpenLayers.Bounds>} |
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| 278 | * resolution - {Number} |
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| 279 | * |
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| 280 | * Returns: |
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| 281 | * Object containing properties tilelon, tilelat, tileoffsetlat, |
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| 282 | * tileoffsetlat, tileoffsetx, tileoffsety |
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| 283 | */ |
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| 284 | calculateGridLayout: function(bounds, extent, resolution) { |
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| 285 | var tilelon = resolution * this.tileSize.w; |
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| 286 | var tilelat = resolution * this.tileSize.h; |
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| 287 | |
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| 288 | var offsetlon = bounds.left - extent.left; |
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| 289 | var tilecol = Math.floor(offsetlon/tilelon) - this.buffer; |
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| 290 | var tilecolremain = offsetlon/tilelon - tilecol; |
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| 291 | var tileoffsetx = -tilecolremain * this.tileSize.w; |
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| 292 | var tileoffsetlon = extent.left + tilecol * tilelon; |
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| 293 | |
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| 294 | var offsetlat = extent.top - bounds.top + tilelat; |
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| 295 | var tilerow = Math.floor(offsetlat/tilelat) - this.buffer; |
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| 296 | var tilerowremain = tilerow - offsetlat/tilelat; |
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| 297 | var tileoffsety = tilerowremain * this.tileSize.h; |
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| 298 | var tileoffsetlat = extent.top - tilelat*tilerow; |
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| 299 | |
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| 300 | return { |
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| 301 | tilelon: tilelon, tilelat: tilelat, |
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| 302 | tileoffsetlon: tileoffsetlon, tileoffsetlat: tileoffsetlat, |
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| 303 | tileoffsetx: tileoffsetx, tileoffsety: tileoffsety |
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| 304 | }; |
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| 305 | }, |
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| 306 | |
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| 307 | CLASS_NAME: "OpenLayers.Layer.Zoomify" |
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| 308 | }); |
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