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-/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
- * full list of contributors). Published under the 2-clause BSD license.
- * See license.txt in the OpenLayers distribution or repository for the
- * full text of the license. */
-
-/**
- * @requires OpenLayers/Format/JSON.js
- * @requires OpenLayers/Feature/Vector.js
- * @requires OpenLayers/Geometry/Point.js
- * @requires OpenLayers/Geometry/MultiPoint.js
- * @requires OpenLayers/Geometry/LineString.js
- * @requires OpenLayers/Geometry/MultiLineString.js
- * @requires OpenLayers/Geometry/Polygon.js
- * @requires OpenLayers/Geometry/MultiPolygon.js
- * @requires OpenLayers/Console.js
- */
-
-/**
- * Class: OpenLayers.Format.GeoJSON
- * Read and write GeoJSON. Create a new parser with the
- * <OpenLayers.Format.GeoJSON> constructor.
- *
- * Inherits from:
- * - <OpenLayers.Format.JSON>
- */
-OpenLayers.Format.GeoJSON = OpenLayers.Class(OpenLayers.Format.JSON, {
-
- /**
- * APIProperty: ignoreExtraDims
- * {Boolean} Ignore dimensions higher than 2 when reading geometry
- * coordinates.
- */
- ignoreExtraDims: false,
-
- /**
- * Constructor: OpenLayers.Format.GeoJSON
- * Create a new parser for GeoJSON.
- *
- * Parameters:
- * options - {Object} An optional object whose properties will be set on
- * this instance.
- */
-
- /**
- * APIMethod: read
- * Deserialize a GeoJSON string.
- *
- * Parameters:
- * json - {String} A GeoJSON string
- * type - {String} Optional string that determines the structure of
- * the output. Supported values are "Geometry", "Feature", and
- * "FeatureCollection". If absent or null, a default of
- * "FeatureCollection" is assumed.
- * filter - {Function} A function which will be called for every key and
- * value at every level of the final result. Each value will be
- * replaced by the result of the filter function. This can be used to
- * reform generic objects into instances of classes, or to transform
- * date strings into Date objects.
- *
- * Returns:
- * {Object} The return depends on the value of the type argument. If type
- * is "FeatureCollection" (the default), the return will be an array
- * of <OpenLayers.Feature.Vector>. If type is "Geometry", the input json
- * must represent a single geometry, and the return will be an
- * <OpenLayers.Geometry>. If type is "Feature", the input json must
- * represent a single feature, and the return will be an
- * <OpenLayers.Feature.Vector>.
- */
- read: function(json, type, filter) {
- type = (type) ? type : "FeatureCollection";
- var results = null;
- var obj = null;
- if (typeof json == "string") {
- obj = OpenLayers.Format.JSON.prototype.read.apply(this,
- [json, filter]);
- } else {
- obj = json;
- }
- if(!obj) {
- OpenLayers.Console.error("Bad JSON: " + json);
- } else if(typeof(obj.type) != "string") {
- OpenLayers.Console.error("Bad GeoJSON - no type: " + json);
- } else if(this.isValidType(obj, type)) {
- switch(type) {
- case "Geometry":
- try {
- results = this.parseGeometry(obj);
- } catch(err) {
- OpenLayers.Console.error(err);
- }
- break;
- case "Feature":
- try {
- results = this.parseFeature(obj);
- results.type = "Feature";
- } catch(err) {
- OpenLayers.Console.error(err);
- }
- break;
- case "FeatureCollection":
- // for type FeatureCollection, we allow input to be any type
- results = [];
- switch(obj.type) {
- case "Feature":
- try {
- results.push(this.parseFeature(obj));
- } catch(err) {
- results = null;
- OpenLayers.Console.error(err);
- }
- break;
- case "FeatureCollection":
- for(var i=0, len=obj.features.length; i<len; ++i) {
- try {
- results.push(this.parseFeature(obj.features[i]));
- } catch(err) {
- results = null;
- OpenLayers.Console.error(err);
- }
- }
- break;
- default:
- try {
- var geom = this.parseGeometry(obj);
- results.push(new OpenLayers.Feature.Vector(geom));
- } catch(err) {
- results = null;
- OpenLayers.Console.error(err);
- }
- }
- break;
- }
- }
- return results;
- },
-
- /**
- * Method: isValidType
- * Check if a GeoJSON object is a valid representative of the given type.
- *
- * Returns:
- * {Boolean} The object is valid GeoJSON object of the given type.
- */
- isValidType: function(obj, type) {
- var valid = false;
- switch(type) {
- case "Geometry":
- if(OpenLayers.Util.indexOf(
- ["Point", "MultiPoint", "LineString", "MultiLineString",
- "Polygon", "MultiPolygon", "Box", "GeometryCollection"],
- obj.type) == -1) {
- // unsupported geometry type
- OpenLayers.Console.error("Unsupported geometry type: " +
- obj.type);
- } else {
- valid = true;
- }
- break;
- case "FeatureCollection":
- // allow for any type to be converted to a feature collection
- valid = true;
- break;
- default:
- // for Feature types must match
- if(obj.type == type) {
- valid = true;
- } else {
- OpenLayers.Console.error("Cannot convert types from " +
- obj.type + " to " + type);
- }
- }
- return valid;
- },
-
- /**
- * Method: parseFeature
- * Convert a feature object from GeoJSON into an
- * <OpenLayers.Feature.Vector>.
- *
- * Parameters:
- * obj - {Object} An object created from a GeoJSON object
- *
- * Returns:
- * {<OpenLayers.Feature.Vector>} A feature.
- */
- parseFeature: function(obj) {
- var feature, geometry, attributes, bbox;
- attributes = (obj.properties) ? obj.properties : {};
- bbox = (obj.geometry && obj.geometry.bbox) || obj.bbox;
- try {
- geometry = this.parseGeometry(obj.geometry);
- } catch(err) {
- // deal with bad geometries
- throw err;
- }
- feature = new OpenLayers.Feature.Vector(geometry, attributes);
- if(bbox) {
- feature.bounds = OpenLayers.Bounds.fromArray(bbox);
- }
- if(obj.id) {
- feature.fid = obj.id;
- }
- return feature;
- },
-
- /**
- * Method: parseGeometry
- * Convert a geometry object from GeoJSON into an <OpenLayers.Geometry>.
- *
- * Parameters:
- * obj - {Object} An object created from a GeoJSON object
- *
- * Returns:
- * {<OpenLayers.Geometry>} A geometry.
- */
- parseGeometry: function(obj) {
- if (obj == null) {
- return null;
- }
- var geometry, collection = false;
- if(obj.type == "GeometryCollection") {
- if(!(OpenLayers.Util.isArray(obj.geometries))) {
- throw "GeometryCollection must have geometries array: " + obj;
- }
- var numGeom = obj.geometries.length;
- var components = new Array(numGeom);
- for(var i=0; i<numGeom; ++i) {
- components[i] = this.parseGeometry.apply(
- this, [obj.geometries[i]]
- );
- }
- geometry = new OpenLayers.Geometry.Collection(components);
- collection = true;
- } else {
- if(!(OpenLayers.Util.isArray(obj.coordinates))) {
- throw "Geometry must have coordinates array: " + obj;
- }
- if(!this.parseCoords[obj.type.toLowerCase()]) {
- throw "Unsupported geometry type: " + obj.type;
- }
- try {
- geometry = this.parseCoords[obj.type.toLowerCase()].apply(
- this, [obj.coordinates]
- );
- } catch(err) {
- // deal with bad coordinates
- throw err;
- }
- }
- // We don't reproject collections because the children are reprojected
- // for us when they are created.
- if (this.internalProjection && this.externalProjection && !collection) {
- geometry.transform(this.externalProjection,
- this.internalProjection);
- }
- return geometry;
- },
-
- /**
- * Property: parseCoords
- * Object with properties corresponding to the GeoJSON geometry types.
- * Property values are functions that do the actual parsing.
- */
- parseCoords: {
- /**
- * Method: parseCoords.point
- * Convert a coordinate array from GeoJSON into an
- * <OpenLayers.Geometry>.
- *
- * Parameters:
- * array - {Object} The coordinates array from the GeoJSON fragment.
- *
- * Returns:
- * {<OpenLayers.Geometry>} A geometry.
- */
- "point": function(array) {
- if (this.ignoreExtraDims == false &&
- array.length != 2) {
- throw "Only 2D points are supported: " + array;
- }
- return new OpenLayers.Geometry.Point(array[0], array[1]);
- },
-
- /**
- * Method: parseCoords.multipoint
- * Convert a coordinate array from GeoJSON into an
- * <OpenLayers.Geometry>.
- *
- * Parameters:
- * array - {Object} The coordinates array from the GeoJSON fragment.
- *
- * Returns:
- * {<OpenLayers.Geometry>} A geometry.
- */
- "multipoint": function(array) {
- var points = [];
- var p = null;
- for(var i=0, len=array.length; i<len; ++i) {
- try {
- p = this.parseCoords["point"].apply(this, [array[i]]);
- } catch(err) {
- throw err;
- }
- points.push(p);
- }
- return new OpenLayers.Geometry.MultiPoint(points);
- },
-
- /**
- * Method: parseCoords.linestring
- * Convert a coordinate array from GeoJSON into an
- * <OpenLayers.Geometry>.
- *
- * Parameters:
- * array - {Object} The coordinates array from the GeoJSON fragment.
- *
- * Returns:
- * {<OpenLayers.Geometry>} A geometry.
- */
- "linestring": function(array) {
- var points = [];
- var p = null;
- for(var i=0, len=array.length; i<len; ++i) {
- try {
- p = this.parseCoords["point"].apply(this, [array[i]]);
- } catch(err) {
- throw err;
- }
- points.push(p);
- }
- return new OpenLayers.Geometry.LineString(points);
- },
-
- /**
- * Method: parseCoords.multilinestring
- * Convert a coordinate array from GeoJSON into an
- * <OpenLayers.Geometry>.
- *
- * Parameters:
- * array - {Object} The coordinates array from the GeoJSON fragment.
- *
- * Returns:
- * {<OpenLayers.Geometry>} A geometry.
- */
- "multilinestring": function(array) {
- var lines = [];
- var l = null;
- for(var i=0, len=array.length; i<len; ++i) {
- try {
- l = this.parseCoords["linestring"].apply(this, [array[i]]);
- } catch(err) {
- throw err;
- }
- lines.push(l);
- }
- return new OpenLayers.Geometry.MultiLineString(lines);
- },
-
- /**
- * Method: parseCoords.polygon
- * Convert a coordinate array from GeoJSON into an
- * <OpenLayers.Geometry>.
- *
- * Returns:
- * {<OpenLayers.Geometry>} A geometry.
- */
- "polygon": function(array) {
- var rings = [];
- var r, l;
- for(var i=0, len=array.length; i<len; ++i) {
- try {
- l = this.parseCoords["linestring"].apply(this, [array[i]]);
- } catch(err) {
- throw err;
- }
- r = new OpenLayers.Geometry.LinearRing(l.components);
- rings.push(r);
- }
- return new OpenLayers.Geometry.Polygon(rings);
- },
-
- /**
- * Method: parseCoords.multipolygon
- * Convert a coordinate array from GeoJSON into an
- * <OpenLayers.Geometry>.
- *
- * Parameters:
- * array - {Object} The coordinates array from the GeoJSON fragment.
- *
- * Returns:
- * {<OpenLayers.Geometry>} A geometry.
- */
- "multipolygon": function(array) {
- var polys = [];
- var p = null;
- for(var i=0, len=array.length; i<len; ++i) {
- try {
- p = this.parseCoords["polygon"].apply(this, [array[i]]);
- } catch(err) {
- throw err;
- }
- polys.push(p);
- }
- return new OpenLayers.Geometry.MultiPolygon(polys);
- },
-
- /**
- * Method: parseCoords.box
- * Convert a coordinate array from GeoJSON into an
- * <OpenLayers.Geometry>.
- *
- * Parameters:
- * array - {Object} The coordinates array from the GeoJSON fragment.
- *
- * Returns:
- * {<OpenLayers.Geometry>} A geometry.
- */
- "box": function(array) {
- if(array.length != 2) {
- throw "GeoJSON box coordinates must have 2 elements";
- }
- return new OpenLayers.Geometry.Polygon([
- new OpenLayers.Geometry.LinearRing([
- new OpenLayers.Geometry.Point(array[0][0], array[0][1]),
- new OpenLayers.Geometry.Point(array[1][0], array[0][1]),
- new OpenLayers.Geometry.Point(array[1][0], array[1][1]),
- new OpenLayers.Geometry.Point(array[0][0], array[1][1]),
- new OpenLayers.Geometry.Point(array[0][0], array[0][1])
- ])
- ]);
- }
-
- },
-
- /**
- * APIMethod: write
- * Serialize a feature, geometry, array of features into a GeoJSON string.
- *
- * Parameters:
- * obj - {Object} An <OpenLayers.Feature.Vector>, <OpenLayers.Geometry>,
- * or an array of features.
- * pretty - {Boolean} Structure the output with newlines and indentation.
- * Default is false.
- *
- * Returns:
- * {String} The GeoJSON string representation of the input geometry,
- * features, or array of features.
- */
- write: function(obj, pretty) {
- var geojson = {
- "type": null
- };
- if(OpenLayers.Util.isArray(obj)) {
- geojson.type = "FeatureCollection";
- var numFeatures = obj.length;
- geojson.features = new Array(numFeatures);
- for(var i=0; i<numFeatures; ++i) {
- var element = obj[i];
- if(!element instanceof OpenLayers.Feature.Vector) {
- var msg = "FeatureCollection only supports collections " +
- "of features: " + element;
- throw msg;
- }
- geojson.features[i] = this.extract.feature.apply(
- this, [element]
- );
- }
- } else if (obj.CLASS_NAME.indexOf("OpenLayers.Geometry") == 0) {
- geojson = this.extract.geometry.apply(this, [obj]);
- } else if (obj instanceof OpenLayers.Feature.Vector) {
- geojson = this.extract.feature.apply(this, [obj]);
- if(obj.layer && obj.layer.projection) {
- geojson.crs = this.createCRSObject(obj);
- }
- }
- return OpenLayers.Format.JSON.prototype.write.apply(this,
- [geojson, pretty]);
- },
-
- /**
- * Method: createCRSObject
- * Create the CRS object for an object.
- *
- * Parameters:
- * object - {<OpenLayers.Feature.Vector>}
- *
- * Returns:
- * {Object} An object which can be assigned to the crs property
- * of a GeoJSON object.
- */
- createCRSObject: function(object) {
- var proj = object.layer.projection.toString();
- var crs = {};
- if (proj.match(/epsg:/i)) {
- var code = parseInt(proj.substring(proj.indexOf(":") + 1));
- if (code == 4326) {
- crs = {
- "type": "name",
- "properties": {
- "name": "urn:ogc:def:crs:OGC:1.3:CRS84"
- }
- };
- } else {
- crs = {
- "type": "name",
- "properties": {
- "name": "EPSG:" + code
- }
- };
- }
- }
- return crs;
- },
-
- /**
- * Property: extract
- * Object with properties corresponding to the GeoJSON types.
- * Property values are functions that do the actual value extraction.
- */
- extract: {
- /**
- * Method: extract.feature
- * Return a partial GeoJSON object representing a single feature.
- *
- * Parameters:
- * feature - {<OpenLayers.Feature.Vector>}
- *
- * Returns:
- * {Object} An object representing the point.
- */
- 'feature': function(feature) {
- var geom = this.extract.geometry.apply(this, [feature.geometry]);
- var json = {
- "type": "Feature",
- "properties": feature.attributes,
- "geometry": geom
- };
- if (feature.fid != null) {
- json.id = feature.fid;
- }
- return json;
- },
-
- /**
- * Method: extract.geometry
- * Return a GeoJSON object representing a single geometry.
- *
- * Parameters:
- * geometry - {<OpenLayers.Geometry>}
- *
- * Returns:
- * {Object} An object representing the geometry.
- */
- 'geometry': function(geometry) {
- if (geometry == null) {
- return null;
- }
- if (this.internalProjection && this.externalProjection) {
- geometry = geometry.clone();
- geometry.transform(this.internalProjection,
- this.externalProjection);
- }
- var geometryType = geometry.CLASS_NAME.split('.')[2];
- var data = this.extract[geometryType.toLowerCase()].apply(this, [geometry]);
- var json;
- if(geometryType == "Collection") {
- json = {
- "type": "GeometryCollection",
- "geometries": data
- };
- } else {
- json = {
- "type": geometryType,
- "coordinates": data
- };
- }
-
- return json;
- },
-
- /**
- * Method: extract.point
- * Return an array of coordinates from a point.
- *
- * Parameters:
- * point - {<OpenLayers.Geometry.Point>}
- *
- * Returns:
- * {Array} An array of coordinates representing the point.
- */
- 'point': function(point) {
- return [point.x, point.y];
- },
-
- /**
- * Method: extract.multipoint
- * Return an array of point coordinates from a multipoint.
- *
- * Parameters:
- * multipoint - {<OpenLayers.Geometry.MultiPoint>}
- *
- * Returns:
- * {Array} An array of point coordinate arrays representing
- * the multipoint.
- */
- 'multipoint': function(multipoint) {
- var array = [];
- for(var i=0, len=multipoint.components.length; i<len; ++i) {
- array.push(this.extract.point.apply(this, [multipoint.components[i]]));
- }
- return array;
- },
-
- /**
- * Method: extract.linestring
- * Return an array of coordinate arrays from a linestring.
- *
- * Parameters:
- * linestring - {<OpenLayers.Geometry.LineString>}
- *
- * Returns:
- * {Array} An array of coordinate arrays representing
- * the linestring.
- */
- 'linestring': function(linestring) {
- var array = [];
- for(var i=0, len=linestring.components.length; i<len; ++i) {
- array.push(this.extract.point.apply(this, [linestring.components[i]]));
- }
- return array;
- },
-
- /**
- * Method: extract.multilinestring
- * Return an array of linestring arrays from a linestring.
- *
- * Parameters:
- * multilinestring - {<OpenLayers.Geometry.MultiLineString>}
- *
- * Returns:
- * {Array} An array of linestring arrays representing
- * the multilinestring.
- */
- 'multilinestring': function(multilinestring) {
- var array = [];
- for(var i=0, len=multilinestring.components.length; i<len; ++i) {
- array.push(this.extract.linestring.apply(this, [multilinestring.components[i]]));
- }
- return array;
- },
-
- /**
- * Method: extract.polygon
- * Return an array of linear ring arrays from a polygon.
- *
- * Parameters:
- * polygon - {<OpenLayers.Geometry.Polygon>}
- *
- * Returns:
- * {Array} An array of linear ring arrays representing the polygon.
- */
- 'polygon': function(polygon) {
- var array = [];
- for(var i=0, len=polygon.components.length; i<len; ++i) {
- array.push(this.extract.linestring.apply(this, [polygon.components[i]]));
- }
- return array;
- },
-
- /**
- * Method: extract.multipolygon
- * Return an array of polygon arrays from a multipolygon.
- *
- * Parameters:
- * multipolygon - {<OpenLayers.Geometry.MultiPolygon>}
- *
- * Returns:
- * {Array} An array of polygon arrays representing
- * the multipolygon
- */
- 'multipolygon': function(multipolygon) {
- var array = [];
- for(var i=0, len=multipolygon.components.length; i<len; ++i) {
- array.push(this.extract.polygon.apply(this, [multipolygon.components[i]]));
- }
- return array;
- },
-
- /**
- * Method: extract.collection
- * Return an array of geometries from a geometry collection.
- *
- * Parameters:
- * collection - {<OpenLayers.Geometry.Collection>}
- *
- * Returns:
- * {Array} An array of geometry objects representing the geometry
- * collection.
- */
- 'collection': function(collection) {
- var len = collection.components.length;
- var array = new Array(len);
- for(var i=0; i<len; ++i) {
- array[i] = this.extract.geometry.apply(
- this, [collection.components[i]]
- );
- }
- return array;
- }
-
-
- },
-
- CLASS_NAME: "OpenLayers.Format.GeoJSON"
-
-});
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-22 19:19:19 +0000