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| Viewing file: Select action/file-type: /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the Clear BSD license.
* See http://svn.openlayers.org/trunk/openlayers/license.txt for the
* full text of the license. */
/**
* @requires OpenLayers/Layer/Grid.js
* @requires OpenLayers/Tile/Image.js
*/
/**
* Class: OpenLayers.Layer.WMTS
* Instances of the WMTS class allow viewing of tiles from a service that
* implements the OGC WMTS specification version 1.0.0.
*
* Inherits from:
* - <OpenLayers.Layer.Grid>
*/
OpenLayers.Layer.WMTS = OpenLayers.Class(OpenLayers.Layer.Grid, {
/**
* APIProperty: isBaseLayer
* {Boolean} The layer will be considered a base layer. Default is true.
*/
isBaseLayer: true,
/**
* Property: version
* {String} WMTS version. Default is "1.0.0".
*/
version: "1.0.0",
/**
* APIProperty: requestEncoding
* {String} Request encoding. Can be "REST" or "KVP". Default is "KVP".
*/
requestEncoding: "KVP",
/**
* APIProperty: url
* {String} The base URL for the WMTS service. Must be provided.
*/
url: null,
/**
* APIProperty: layer
* {String} The layer identifier advertised by the WMTS service. Must be
* provided.
*/
layer: null,
/**
* APIProperty: matrixSet
* {String} One of the advertised matrix set identifiers. Must be provided.
*/
matrixSet: null,
/**
* APIProperty: style
* {String} One of the advertised layer styles. Must be provided.
*/
style: null,
/**
* APIProperty: format
* {String} The image MIME type. Default is "image/jpeg".
*/
format: "image/jpeg",
/**
* APIProperty: tileOrigin
* {<OpenLayers.LonLat>} The top-left corner of the tile matrix in map
* units. If the tile origin for each matrix in a set is different,
* the <matrixIds> should include a topLeftCorner property. If
* not provided, the tile origin will default to the top left corner
* of the layer <maxExtent>.
*/
tileOrigin: null,
/**
* APIProperty: tileFullExtent
* {<OpenLayers.Bounds>} The full extent of the tile set. If not supplied,
* the layer's <maxExtent> property will be used.
*/
tileFullExtent: null,
/**
* APIProperty: formatSuffix
* {String} For REST request encoding, an image format suffix must be
* included in the request. If not provided, the suffix will be derived
* from the <format> property.
*/
formatSuffix: null,
/**
* APIProperty: matrixIds
* {Array} A list of tile matrix identifiers. If not provided, the matrix
* identifiers will be assumed to be integers corresponding to the
* map zoom level. If a list of strings is provided, each item should
* be the matrix identifier that corresponds to the map zoom level.
* Additionally, a list of objects can be provided. Each object should
* describe the matrix as presented in the WMTS capabilities. These
* objects should have the propertes shown below.
*
* Matrix properties:
* identifier - {String} The matrix identifier (required).
* topLeftCorner - {<OpenLayers.LonLat>} The top left corner of the
* matrix. Must be provided if different than the layer <tileOrigin>.
* tileWidth - {Number} The tile width for the matrix. Must be provided
* if different than the width given in the layer <tileSize>.
* tileHeight - {Number} The tile height for the matrix. Must be provided
* if different than the height given in the layer <tileSize>.
*/
matrixIds: null,
/**
* APIProperty: dimensions
* {Array} For RESTful request encoding, extra dimensions may be specified.
* Items in this list should be property names in the <params> object.
* Values of extra dimensions will be determined from the corresponding
* values in the <params> object.
*/
dimensions: null,
/**
* APIProperty: params
* {Object} Extra parameters to include in tile requests. For KVP
* <requestEncoding>, these properties will be encoded in the request
* query string. For REST <requestEncoding>, these properties will
* become part of the request path, with order determined by the
* <dimensions> list.
*/
params: null,
/**
* APIProperty: zoomOffset
* {Number} If your cache has more levels than you want to provide
* access to with this layer, supply a zoomOffset. This zoom offset
* is added to the current map zoom level to determine the level
* for a requested tile. For example, if you supply a zoomOffset
* of 3, when the map is at the zoom 0, tiles will be requested from
* level 3 of your cache. Default is 0 (assumes cache level and map
* zoom are equivalent). Additionally, if this layer is to be used
* as an overlay and the cache has fewer zoom levels than the base
* layer, you can supply a negative zoomOffset. For example, if a
* map zoom level of 1 corresponds to your cache level zero, you would
* supply a -1 zoomOffset (and set the maxResolution of the layer
* appropriately). The zoomOffset value has no effect if complete
* matrix definitions (including scaleDenominator) are supplied in
* the <matrixIds> property. Defaults to 0 (no zoom offset).
*/
zoomOffset: 0,
/**
* Property: formatSuffixMap
* {Object} a map between WMTS 'format' request parameter and tile image file suffix
*/
formatSuffixMap: {
"image/png": "png",
"image/png8": "png",
"image/png24": "png",
"image/png32": "png",
"png": "png",
"image/jpeg": "jpg",
"image/jpg": "jpg",
"jpeg": "jpg",
"jpg": "jpg"
},
/**
* Property: matrix
* {Object} Matrix definition for the current map resolution. Updated by
* the <updateMatrixProperties> method.
*/
matrix: null,
/**
* Constructor: OpenLayers.Layer.WMTS
* Create a new WMTS layer.
*
* Example:
* (code)
* var wmts = new OpenLayers.Layer.WMTS({
* name: "My WMTS Layer",
* url: "http://example.com/wmts",
* layer: "layer_id",
* style: "default",
* matrixSet: "matrix_id"
* });
* (end)
*
* Parameters:
* config - {Object} Configuration properties for the layer.
*
* Required configuration properties:
* url - {String} The base url for the service. See the <url> property.
* layer - {String} The layer identifier. See the <layer> property.
* style - {String} The layer style identifier. See the <style> property.
* matrixSet - {String} The tile matrix set identifier. See the <matrixSet>
* property.
*
* Any other documented layer properties can be provided in the config object.
*/
initialize: function(config) {
// confirm required properties are supplied
var required = {
url: true,
layer: true,
style: true,
matrixSet: true
};
for (var prop in required) {
if (!(prop in config)) {
throw new Error("Missing property '" + prop + "' in layer configuration.");
}
}
config.params = OpenLayers.Util.upperCaseObject(config.params);
var args = [config.name, config.url, config.params, config];
OpenLayers.Layer.Grid.prototype.initialize.apply(this, args);
// determine format suffix (for REST)
if (!this.formatSuffix) {
this.formatSuffix = this.formatSuffixMap[this.format] || this.format.split("/").pop();
}
// expand matrixIds (may be array of string or array of object)
if (this.matrixIds) {
var len = this.matrixIds.length;
if (len && typeof this.matrixIds[0] === "string") {
var ids = this.matrixIds;
this.matrixIds = new Array(len);
for (var i=0; i<len; ++i) {
this.matrixIds[i] = {identifier: ids[i]};
}
}
}
},
/**
* Method: setMap
*/
setMap: function() {
OpenLayers.Layer.Grid.prototype.setMap.apply(this, arguments);
this.updateMatrixProperties();
},
/**
* Method: updateMatrixProperties
* Called when map resolution changes to update matrix related properties.
*/
updateMatrixProperties: function() {
this.matrix = this.getMatrix();
if (this.matrix) {
if (this.matrix.topLeftCorner) {
this.tileOrigin = this.matrix.topLeftCorner;
}
if (this.matrix.tileWidth && this.matrix.tileHeight) {
this.tileSize = new OpenLayers.Size(
this.matrix.tileWidth, this.matrix.tileHeight
);
}
if (!this.tileOrigin) {
this.tileOrigin = new OpenLayers.LonLat(
this.maxExtent.left, this.maxExtent.top
);
}
if (!this.tileFullExtent) {
this.tileFullExtent = this.maxExtent;
}
}
},
/**
* Method: moveTo
*
* Parameters:
* bound - {<OpenLayers.Bounds>}
* zoomChanged - {Boolean} Tells when zoom has changed, as layers have to
* do some init work in that case.
* dragging - {Boolean}
*/
moveTo:function(bounds, zoomChanged, dragging) {
if (zoomChanged || !this.matrix) {
this.updateMatrixProperties();
}
return OpenLayers.Layer.Grid.prototype.moveTo.apply(this, arguments);
},
/**
* APIMethod: clone
*
* Parameters:
* obj - {Object}
*
* Returns:
* {<OpenLayers.Layer.WMTS>} An exact clone of this <OpenLayers.Layer.WMTS>
*/
clone: function(obj) {
if (obj == null) {
obj = new OpenLayers.Layer.WMTS(this.options);
}
//get all additions from superclasses
obj = OpenLayers.Layer.Grid.prototype.clone.apply(this, [obj]);
// copy/set any non-init, non-simple values here
return obj;
},
/**
* Method: getMatrix
* Get the appropriate matrix definition for the current map resolution.
*/
getMatrix: function() {
var matrix;
if (!this.matrixIds || this.matrixIds.length === 0) {
matrix = {identifier: this.map.getZoom() + this.zoomOffset};
} else {
// get appropriate matrix given the map scale if possible
if ("scaleDenominator" in this.matrixIds[0]) {
// scale denominator calculation based on WMTS spec
var denom =
OpenLayers.METERS_PER_INCH *
OpenLayers.INCHES_PER_UNIT[this.units] *
this.map.getResolution() / 0.28E-3;
var diff = Number.POSITIVE_INFINITY;
var delta;
for (var i=0, ii=this.matrixIds.length; i<ii; ++i) {
delta = Math.abs(1 - (this.matrixIds[i].scaleDenominator / denom));
if (delta < diff) {
diff = delta;
matrix = this.matrixIds[i];
}
}
} else {
// fall back on zoom as index
matrix = this.matrixIds[this.map.getZoom() + this.zoomOffset];
}
}
return matrix;
},
/**
* Method: getTileInfo
* Get tile information for a given location at the current map resolution.
*
* Parameters:
* loc - {<OpenLayers.LonLat} A location in map coordinates.
*
* Returns:
* {Object} An object with "col", "row", "i", and "j" properties. The col
* and row values are zero based tile indexes from the top left. The
* i and j values are the number of pixels to the left and top
* (respectively) of the given location within the target tile.
*/
getTileInfo: function(loc) {
var res = this.map.getResolution();
var fx = (loc.lon - this.tileOrigin.lon) / (res * this.tileSize.w);
var fy = (this.tileOrigin.lat - loc.lat) / (res * this.tileSize.h);
var col = Math.floor(fx);
var row = Math.floor(fy);
return {
col: col,
row: row,
i: Math.floor((fx - col) * this.tileSize.w),
j: Math.floor((fy - row) * this.tileSize.h)
};
},
/**
* Method: getURL
*
* Parameters:
* bounds - {<OpenLayers.Bounds>}
*
* Returns:
* {String} A URL for the tile corresponding to the given bounds.
*/
getURL: function(bounds) {
bounds = this.adjustBounds(bounds);
var url = "";
if (!this.tileFullExtent || this.tileFullExtent.intersectsBounds(bounds)) {
var center = bounds.getCenterLonLat();
var info = this.getTileInfo(center);
var matrixId = this.matrix.identifier;
if (this.requestEncoding.toUpperCase() === "REST") {
// include 'version', 'layer' and 'style' in tile resource url
var path = this.version + "/" + this.layer + "/" + this.style + "/";
// append optional dimension path elements
if (this.dimensions) {
for (var i=0; i<this.dimensions.length; i++) {
if (this.params[this.dimensions[i]]) {
path = path + this.params[this.dimensions[i]] + "/";
}
}
}
// append other required path elements
path = path + this.matrixSet + "/" + this.matrix.identifier +
"/" + info.row + "/" + info.col + "." + this.formatSuffix;
if (this.url instanceof Array) {
url = this.selectUrl(path, this.url);
} else {
url = this.url;
}
if (!url.match(/\/$/)) {
url = url + "/";
}
url = url + path;
} else if (this.requestEncoding.toUpperCase() === "KVP") {
// assemble all required parameters
var params = {
SERVICE: "WMTS",
REQUEST: "GetTile",
VERSION: this.version,
LAYER: this.layer,
STYLE: this.style,
TILEMATRIXSET: this.matrixSet,
TILEMATRIX: this.matrix.identifier,
TILEROW: info.row,
TILECOL: info.col,
FORMAT: this.format
};
url = OpenLayers.Layer.Grid.prototype.getFullRequestString.apply(this, [params]);
}
}
return url;
},
/**
* APIMethod: mergeNewParams
* Extend the existing layer <params> with new properties. Tiles will be
* reloaded with updated params in the request.
*
* Parameters:
* newParams - {Object} Properties to extend to existing <params>.
*/
mergeNewParams: function(newParams) {
if (this.requestEncoding.toUpperCase() === "KVP") {
return OpenLayers.Layer.Grid.prototype.mergeNewParams.apply(
this, [OpenLayers.Util.upperCaseObject(newParams)]
);
}
},
/**
* Method: addTile
* Create a tile, initialize it, and add it to the layer div.
*
* Parameters:
* bounds - {<OpenLayers.Bounds>}
* position - {<OpenLayers.Pixel>}
*
* Returns:
* {<OpenLayers.Tile.Image>} The added OpenLayers.Tile.Image
*/
addTile: function(bounds,position) {
return new OpenLayers.Tile.Image(this, position, bounds,
null, this.tileSize);
},
CLASS_NAME: "OpenLayers.Layer.WMTS"
});
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