[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.WorldWind |
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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.WorldWind = OpenLayers.Class(OpenLayers.Layer.Grid, { |
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| 18 | |
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| 19 | DEFAULT_PARAMS: { |
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| 20 | }, |
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| 21 | |
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| 22 | /** |
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| 23 | * APIProperty: isBaseLayer |
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| 24 | * WorldWind layer is a base layer by default. |
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| 25 | */ |
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| 26 | isBaseLayer: true, |
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| 27 | |
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| 28 | |
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| 29 | /** |
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| 30 | * APIProperty: lzd |
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| 31 | * LevelZeroTileSizeDegrees |
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| 32 | */ |
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| 33 | lzd: null, |
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| 34 | |
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| 35 | /** |
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| 36 | * APIProperty: zoomLevels |
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| 37 | * Number of zoom levels. |
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| 38 | */ |
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| 39 | zoomLevels: null, |
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| 40 | |
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| 41 | /** |
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| 42 | * Constructor: OpenLayers.Layer.WorldWind |
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| 43 | * |
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| 44 | * Parameters: |
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| 45 | * name - {String} Name of Layer |
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| 46 | * url - {String} Base URL |
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| 47 | * lzd - {Float} Level zero tile size degrees |
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| 48 | * zoomLevels - {Int} number of zoom levels |
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| 49 | * params - {Object} additional parameters |
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| 50 | * options - {Object} additional options |
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| 51 | */ |
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| 52 | initialize: function(name, url, lzd, zoomLevels, params, options) { |
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| 53 | this.lzd = lzd; |
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| 54 | this.zoomLevels = zoomLevels; |
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| 55 | var newArguments = []; |
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| 56 | newArguments.push(name, url, params, options); |
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| 57 | OpenLayers.Layer.Grid.prototype.initialize.apply(this, newArguments); |
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| 58 | this.params = OpenLayers.Util.applyDefaults( |
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| 59 | this.params, this.DEFAULT_PARAMS |
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| 60 | ); |
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| 61 | }, |
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| 62 | /** |
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| 63 | * Method: addTile |
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| 64 | * |
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| 65 | * Parameters: |
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| 66 | * bounds - {<OpenLayers.Bounds>} |
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| 67 | * position - {<OpenLayers.Pixel>} |
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| 68 | * |
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| 69 | * Returns: |
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| 70 | * {<OpenLayers.Tile.Image>} The added OpenLayers.Tile.Image |
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| 71 | */ |
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| 72 | addTile:function(bounds,position) { |
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| 73 | return new OpenLayers.Tile.Image(this, position, bounds, |
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| 74 | null, this.tileSize); |
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| 75 | }, |
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| 76 | |
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| 77 | /** |
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| 78 | * Method: getZoom |
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| 79 | * Convert map zoom to WW zoom. |
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| 80 | */ |
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| 81 | getZoom: function () { |
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| 82 | var zoom = this.map.getZoom(); |
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| 83 | var extent = this.map.getMaxExtent(); |
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| 84 | zoom = zoom - Math.log(this.maxResolution / (this.lzd/512))/Math.log(2); |
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| 85 | return zoom; |
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| 86 | }, |
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| 87 | |
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| 88 | /** |
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| 89 | * Method: getURL |
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| 90 | * |
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| 91 | * Parameters: |
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| 92 | * bounds - {<OpenLayers.Bounds>} |
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| 93 | * |
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| 94 | * Returns: |
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| 95 | * {String} A string with the layer's url and parameters and also the |
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| 96 | * passed-in bounds and appropriate tile size specified as |
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| 97 | * parameters |
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| 98 | */ |
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| 99 | getURL: function (bounds) { |
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| 100 | bounds = this.adjustBounds(bounds); |
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| 101 | var zoom = this.getZoom(); |
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| 102 | var extent = this.map.getMaxExtent(); |
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| 103 | var deg = this.lzd/Math.pow(2,this.getZoom()); |
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| 104 | var x = Math.floor((bounds.left - extent.left)/deg); |
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| 105 | var y = Math.floor((bounds.bottom - extent.bottom)/deg); |
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| 106 | if (this.map.getResolution() <= (this.lzd/512) |
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| 107 | && this.getZoom() <= this.zoomLevels) { |
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| 108 | return this.getFullRequestString( |
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| 109 | { L: zoom, |
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| 110 | X: x, |
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| 111 | Y: y |
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| 112 | }); |
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| 113 | } else { |
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| 114 | return OpenLayers.Util.getImagesLocation() + "blank.gif"; |
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| 115 | } |
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| 116 | |
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| 117 | }, |
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| 118 | |
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| 119 | CLASS_NAME: "OpenLayers.Layer.WorldWind" |
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| 120 | }); |
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