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 | /** |
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8 | * @requires OpenLayers/Layer/Grid.js |
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9 | */ |
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10 | |
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11 | /** |
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12 | * Class: OpenLayers.Layer.KaMap |
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13 | * |
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14 | * Inherits from: |
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15 | * - <OpenLayers.Layer.Grid> |
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16 | */ |
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17 | OpenLayers.Layer.KaMap = OpenLayers.Class(OpenLayers.Layer.Grid, { |
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18 | |
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19 | /** |
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20 | * APIProperty: isBaseLayer |
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21 | * {Boolean} KaMap Layer is always a base layer |
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22 | */ |
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23 | isBaseLayer: true, |
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24 | |
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25 | /** |
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26 | * APIProperty: units |
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27 | * {?} |
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28 | */ |
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29 | units: null, |
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30 | |
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31 | /** |
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32 | * APIProperty: resolution |
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33 | * {Float} |
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34 | */ |
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35 | resolution: OpenLayers.DOTS_PER_INCH, |
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36 | |
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37 | /** |
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38 | * Constant: DEFAULT_PARAMS |
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39 | * {Object} parameters set by default. The default parameters set |
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40 | * the format via the 'i' parameter to 'jpeg'. |
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41 | */ |
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42 | DEFAULT_PARAMS: { |
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43 | i: 'jpeg', |
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44 | map: '' |
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45 | }, |
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46 | |
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47 | /** |
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48 | * Constructor: OpenLayers.Layer.KaMap |
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49 | * |
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50 | * Parameters: |
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51 | * name - {String} |
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52 | * url - {String} |
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53 | * params - {Object} Parameters to be sent to the HTTP server in the |
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54 | * query string for the tile. The format can be set via the 'i' |
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55 | * parameter (defaults to jpg) , and the map should be set via |
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56 | * the 'map' parameter. It has been reported that ka-Map may behave |
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57 | * inconsistently if your format parameter does not match the format |
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58 | * parameter configured in your config.php. (See ticket #327 for more |
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59 | * information.) |
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60 | * options - {Object} Additional options for the layer. Any of the |
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61 | * APIProperties listed on this layer, and any layer types it |
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62 | * extends, can be overridden through the options parameter. |
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63 | */ |
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64 | initialize: function(name, url, params, options) { |
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65 | var newArguments = []; |
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66 | newArguments.push(name, url, params, options); |
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67 | OpenLayers.Layer.Grid.prototype.initialize.apply(this, newArguments); |
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68 | this.params = OpenLayers.Util.applyDefaults( |
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69 | this.params, this.DEFAULT_PARAMS |
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70 | ); |
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71 | }, |
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72 | |
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73 | /** |
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74 | * Method: getURL |
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75 | * |
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76 | * Parameters: |
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77 | * bounds - {<OpenLayers.Bounds>} |
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78 | * |
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79 | * Returns: |
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80 | * {String} A string with the layer's url and parameters and also the |
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81 | * passed-in bounds and appropriate tile size specified as |
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82 | * parameters |
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83 | */ |
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84 | getURL: function (bounds) { |
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85 | bounds = this.adjustBounds(bounds); |
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86 | var mapRes = this.map.getResolution(); |
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87 | var scale = Math.round((this.map.getScale() * 10000)) / 10000; |
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88 | var pX = Math.round(bounds.left / mapRes); |
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89 | var pY = -Math.round(bounds.top / mapRes); |
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90 | return this.getFullRequestString( |
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91 | { t: pY, |
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92 | l: pX, |
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93 | s: scale |
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94 | }); |
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95 | }, |
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96 | |
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97 | /** |
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98 | * Method: addTile |
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99 | * |
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100 | * Parameters: |
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101 | * bounds - {<OpenLayers.Bounds>} |
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102 | * position - {<OpenLayers.Pixel>} |
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103 | * |
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104 | * Returns: |
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105 | * {<OpenLayers.Tile.Image>} |
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106 | */ |
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107 | addTile:function(bounds,position) { |
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108 | var url = this.getURL(bounds); |
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109 | return new OpenLayers.Tile.Image(this, position, bounds, |
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110 | url, this.tileSize); |
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111 | }, |
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112 | |
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113 | /** |
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114 | * Method: calculateGridLayout |
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115 | * ka-Map uses the center point of the map as an origin for |
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116 | * its tiles. Override calculateGridLayout to center tiles |
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117 | * correctly for this case. |
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118 | * |
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119 | * Parameters: |
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120 | * bounds - {<OpenLayers.Bound>} |
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121 | * extent - {<OpenLayers.Bounds>} |
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122 | * resolution - {Number} |
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123 | * |
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124 | * Returns: |
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125 | * Object containing properties tilelon, tilelat, tileoffsetlat, |
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126 | * tileoffsetlat, tileoffsetx, tileoffsety |
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127 | */ |
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128 | calculateGridLayout: function(bounds, extent, resolution) { |
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129 | var tilelon = resolution*this.tileSize.w; |
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130 | var tilelat = resolution*this.tileSize.h; |
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131 | |
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132 | var offsetlon = bounds.left; |
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133 | var tilecol = Math.floor(offsetlon/tilelon) - this.buffer; |
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134 | var tilecolremain = offsetlon/tilelon - tilecol; |
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135 | var tileoffsetx = -tilecolremain * this.tileSize.w; |
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136 | var tileoffsetlon = tilecol * tilelon; |
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137 | |
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138 | var offsetlat = bounds.top; |
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139 | var tilerow = Math.ceil(offsetlat/tilelat) + this.buffer; |
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140 | var tilerowremain = tilerow - offsetlat/tilelat; |
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141 | var tileoffsety = -(tilerowremain+1) * this.tileSize.h; |
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142 | var tileoffsetlat = tilerow * tilelat; |
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143 | |
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144 | return { |
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145 | tilelon: tilelon, tilelat: tilelat, |
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146 | tileoffsetlon: tileoffsetlon, tileoffsetlat: tileoffsetlat, |
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147 | tileoffsetx: tileoffsetx, tileoffsety: tileoffsety |
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148 | }; |
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149 | }, |
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150 | |
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151 | /** |
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152 | * APIMethod: clone |
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153 | * |
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154 | * Parameters: |
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155 | * obj - {Object} |
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156 | * |
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157 | * Returns: |
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158 | * {<OpenLayers.Layer.Kamap>} An exact clone of this OpenLayers.Layer.KaMap |
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159 | */ |
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160 | clone: function (obj) { |
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161 | |
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162 | if (obj == null) { |
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163 | obj = new OpenLayers.Layer.KaMap(this.name, |
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164 | this.url, |
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165 | this.params, |
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166 | this.getOptions()); |
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167 | } |
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168 | |
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169 | //get all additions from superclasses |
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170 | obj = OpenLayers.Layer.Grid.prototype.clone.apply(this, [obj]); |
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171 | |
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172 | // copy/set any non-init, non-simple values here |
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173 | if (this.tileSize != null) { |
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174 | obj.tileSize = this.tileSize.clone(); |
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175 | } |
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176 | |
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177 | // we do not want to copy reference to grid, so we make a new array |
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178 | obj.grid = []; |
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179 | |
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180 | return obj; |
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181 | }, |
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182 | |
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183 | /** |
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184 | * APIMethod: getTileBounds |
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185 | * Returns The tile bounds for a layer given a pixel location. |
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186 | * |
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187 | * Parameters: |
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188 | * viewPortPx - {<OpenLayers.Pixel>} The location in the viewport. |
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189 | * |
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190 | * Returns: |
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191 | * {<OpenLayers.Bounds>} Bounds of the tile at the given pixel location. |
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192 | */ |
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193 | getTileBounds: function(viewPortPx) { |
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194 | var resolution = this.getResolution(); |
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195 | var tileMapWidth = resolution * this.tileSize.w; |
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196 | var tileMapHeight = resolution * this.tileSize.h; |
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197 | var mapPoint = this.getLonLatFromViewPortPx(viewPortPx); |
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198 | var tileLeft = tileMapWidth * Math.floor(mapPoint.lon / tileMapWidth); |
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199 | var tileBottom = tileMapHeight * Math.floor(mapPoint.lat / tileMapHeight); |
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200 | return new OpenLayers.Bounds(tileLeft, tileBottom, |
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201 | tileLeft + tileMapWidth, |
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202 | tileBottom + tileMapHeight); |
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203 | }, |
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204 | |
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205 | CLASS_NAME: "OpenLayers.Layer.KaMap" |
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206 | }); |
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