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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