[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 | /** |
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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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