goog.provide('ol.format.TopoJSON');
goog.require('goog.asserts');
goog.require('goog.object');
goog.require('ol.Feature');
goog.require('ol.format.Feature');
goog.require('ol.format.JSONFeature');
goog.require('ol.geom.LineString');
goog.require('ol.geom.MultiLineString');
goog.require('ol.geom.MultiPoint');
goog.require('ol.geom.MultiPolygon');
goog.require('ol.geom.Point');
goog.require('ol.geom.Polygon');
goog.require('ol.proj');
/**
* @classdesc
* Feature format for reading and writing data in the TopoJSON format.
*
* @constructor
* @extends {ol.format.JSONFeature}
* @param {olx.format.TopoJSONOptions=} opt_options Options.
* @api stable
*/
ol.format.TopoJSON = function(opt_options) {
var options = goog.isDef(opt_options) ? opt_options : {};
goog.base(this);
/**
* @inheritDoc
*/
this.defaultDataProjection = ol.proj.get(
goog.isDefAndNotNull(options.defaultDataProjection) ?
options.defaultDataProjection : 'EPSG:4326');
};
goog.inherits(ol.format.TopoJSON, ol.format.JSONFeature);
/**
* @const {Array.<string>}
* @private
*/
ol.format.TopoJSON.EXTENSIONS_ = ['.topojson'];
/**
* Concatenate arcs into a coordinate array.
* @param {Array.<number>} indices Indices of arcs to concatenate. Negative
* values indicate arcs need to be reversed.
* @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs (already
* transformed).
* @return {Array.<ol.Coordinate>} Coordinates array.
* @private
*/
ol.format.TopoJSON.concatenateArcs_ = function(indices, arcs) {
/** @type {Array.<ol.Coordinate>} */
var coordinates = [];
var index, arc;
var i, ii;
var j, jj;
for (i = 0, ii = indices.length; i < ii; ++i) {
index = indices[i];
if (i > 0) {
// splicing together arcs, discard last point
coordinates.pop();
}
if (index >= 0) {
// forward arc
arc = arcs[index];
} else {
// reverse arc
arc = arcs[~index].slice().reverse();
}
coordinates.push.apply(coordinates, arc);
}
// provide fresh copies of coordinate arrays
for (j = 0, jj = coordinates.length; j < jj; ++j) {
coordinates[j] = coordinates[j].slice();
}
return coordinates;
};
/**
* Create a point from a TopoJSON geometry object.
*
* @param {TopoJSONGeometry} object TopoJSON object.
* @param {Array.<number>} scale Scale for each dimension.
* @param {Array.<number>} translate Translation for each dimension.
* @return {ol.geom.Point} Geometry.
* @private
*/
ol.format.TopoJSON.readPointGeometry_ = function(object, scale, translate) {
var coordinates = object.coordinates;
if (!goog.isNull(scale) && !goog.isNull(translate)) {
ol.format.TopoJSON.transformVertex_(coordinates, scale, translate);
}
return new ol.geom.Point(coordinates);
};
/**
* Create a multi-point from a TopoJSON geometry object.
*
* @param {TopoJSONGeometry} object TopoJSON object.
* @param {Array.<number>} scale Scale for each dimension.
* @param {Array.<number>} translate Translation for each dimension.
* @return {ol.geom.MultiPoint} Geometry.
* @private
*/
ol.format.TopoJSON.readMultiPointGeometry_ = function(object, scale,
translate) {
var coordinates = object.coordinates;
var i, ii;
if (!goog.isNull(scale) && !goog.isNull(translate)) {
for (i = 0, ii = coordinates.length; i < ii; ++i) {
ol.format.TopoJSON.transformVertex_(coordinates[i], scale, translate);
}
}
return new ol.geom.MultiPoint(coordinates);
};
/**
* Create a linestring from a TopoJSON geometry object.
*
* @param {TopoJSONGeometry} object TopoJSON object.
* @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
* @return {ol.geom.LineString} Geometry.
* @private
*/
ol.format.TopoJSON.readLineStringGeometry_ = function(object, arcs) {
var coordinates = ol.format.TopoJSON.concatenateArcs_(object.arcs, arcs);
return new ol.geom.LineString(coordinates);
};
/**
* Create a multi-linestring from a TopoJSON geometry object.
*
* @param {TopoJSONGeometry} object TopoJSON object.
* @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
* @return {ol.geom.MultiLineString} Geometry.
* @private
*/
ol.format.TopoJSON.readMultiLineStringGeometry_ = function(object, arcs) {
var coordinates = [];
var i, ii;
for (i = 0, ii = object.arcs.length; i < ii; ++i) {
coordinates[i] = ol.format.TopoJSON.concatenateArcs_(object.arcs[i], arcs);
}
return new ol.geom.MultiLineString(coordinates);
};
/**
* Create a polygon from a TopoJSON geometry object.
*
* @param {TopoJSONGeometry} object TopoJSON object.
* @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
* @return {ol.geom.Polygon} Geometry.
* @private
*/
ol.format.TopoJSON.readPolygonGeometry_ = function(object, arcs) {
var coordinates = [];
var i, ii;
for (i = 0, ii = object.arcs.length; i < ii; ++i) {
coordinates[i] = ol.format.TopoJSON.concatenateArcs_(object.arcs[i], arcs);
}
return new ol.geom.Polygon(coordinates);
};
/**
* Create a multi-polygon from a TopoJSON geometry object.
*
* @param {TopoJSONGeometry} object TopoJSON object.
* @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
* @return {ol.geom.MultiPolygon} Geometry.
* @private
*/
ol.format.TopoJSON.readMultiPolygonGeometry_ = function(object, arcs) {
var coordinates = [];
var polyArray, ringCoords, j, jj;
var i, ii;
for (i = 0, ii = object.arcs.length; i < ii; ++i) {
// for each polygon
polyArray = object.arcs[i];
ringCoords = [];
for (j = 0, jj = polyArray.length; j < jj; ++j) {
// for each ring
ringCoords[j] = ol.format.TopoJSON.concatenateArcs_(polyArray[j], arcs);
}
coordinates[i] = ringCoords;
}
return new ol.geom.MultiPolygon(coordinates);
};
/**
* @inheritDoc
*/
ol.format.TopoJSON.prototype.getExtensions = function() {
return ol.format.TopoJSON.EXTENSIONS_;
};
/**
* Create features from a TopoJSON GeometryCollection object.
*
* @param {TopoJSONGeometryCollection} collection TopoJSON Geometry
* object.
* @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
* @param {Array.<number>} scale Scale for each dimension.
* @param {Array.<number>} translate Translation for each dimension.
* @param {olx.format.ReadOptions=} opt_options Read options.
* @return {Array.<ol.Feature>} Array of features.
* @private
*/
ol.format.TopoJSON.readFeaturesFromGeometryCollection_ = function(
collection, arcs, scale, translate, opt_options) {
var geometries = collection.geometries;
var features = [];
var i, ii;
for (i = 0, ii = geometries.length; i < ii; ++i) {
features[i] = ol.format.TopoJSON.readFeatureFromGeometry_(
geometries[i], arcs, scale, translate, opt_options);
}
return features;
};
/**
* Create a feature from a TopoJSON geometry object.
*
* @param {TopoJSONGeometry} object TopoJSON geometry object.
* @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
* @param {Array.<number>} scale Scale for each dimension.
* @param {Array.<number>} translate Translation for each dimension.
* @param {olx.format.ReadOptions=} opt_options Read options.
* @return {ol.Feature} Feature.
* @private
*/
ol.format.TopoJSON.readFeatureFromGeometry_ = function(object, arcs,
scale, translate, opt_options) {
var geometry;
var type = object.type;
var geometryReader = ol.format.TopoJSON.GEOMETRY_READERS_[type];
goog.asserts.assert(goog.isDef(geometryReader));
if ((type === 'Point') || (type === 'MultiPoint')) {
geometry = geometryReader(object, scale, translate);
} else {
geometry = geometryReader(object, arcs);
}
var feature = new ol.Feature();
feature.setGeometry(/** @type {ol.geom.Geometry} */ (
ol.format.Feature.transformWithOptions(geometry, false, opt_options)));
if (goog.isDef(object.id)) {
feature.setId(object.id);
}
if (goog.isDef(object.properties)) {
feature.setProperties(object.properties);
}
return feature;
};
/**
* Read all features from a TopoJSON source.
*
* @function
* @param {ArrayBuffer|Document|Node|Object|string} source Source.
* @return {Array.<ol.Feature>} Features.
* @api stable
*/
ol.format.TopoJSON.prototype.readFeatures;
/**
* @inheritDoc
*/
ol.format.TopoJSON.prototype.readFeaturesFromObject = function(
object, opt_options) {
if (object.type == 'Topology') {
var topoJSONTopology = /** @type {TopoJSONTopology} */ (object);
var transform, scale = null, translate = null;
if (goog.isDef(topoJSONTopology.transform)) {
transform = /** @type {TopoJSONTransform} */
(topoJSONTopology.transform);
scale = transform.scale;
translate = transform.translate;
}
var arcs = topoJSONTopology.arcs;
if (goog.isDef(transform)) {
ol.format.TopoJSON.transformArcs_(arcs, scale, translate);
}
/** @type {Array.<ol.Feature>} */
var features = [];
var topoJSONFeatures = goog.object.getValues(topoJSONTopology.objects);
var i, ii;
var feature;
for (i = 0, ii = topoJSONFeatures.length; i < ii; ++i) {
if (topoJSONFeatures[i].type === 'GeometryCollection') {
feature = /** @type {TopoJSONGeometryCollection} */
(topoJSONFeatures[i]);
features.push.apply(features,
ol.format.TopoJSON.readFeaturesFromGeometryCollection_(
feature, arcs, scale, translate, opt_options));
} else {
feature = /** @type {TopoJSONGeometry} */
(topoJSONFeatures[i]);
features.push(ol.format.TopoJSON.readFeatureFromGeometry_(
feature, arcs, scale, translate, opt_options));
}
}
return features;
} else {
return [];
}
};
/**
* Apply a linear transform to array of arcs. The provided array of arcs is
* modified in place.
*
* @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
* @param {Array.<number>} scale Scale for each dimension.
* @param {Array.<number>} translate Translation for each dimension.
* @private
*/
ol.format.TopoJSON.transformArcs_ = function(arcs, scale, translate) {
var i, ii;
for (i = 0, ii = arcs.length; i < ii; ++i) {
ol.format.TopoJSON.transformArc_(arcs[i], scale, translate);
}
};
/**
* Apply a linear transform to an arc. The provided arc is modified in place.
*
* @param {Array.<ol.Coordinate>} arc Arc.
* @param {Array.<number>} scale Scale for each dimension.
* @param {Array.<number>} translate Translation for each dimension.
* @private
*/
ol.format.TopoJSON.transformArc_ = function(arc, scale, translate) {
var x = 0;
var y = 0;
var vertex;
var i, ii;
for (i = 0, ii = arc.length; i < ii; ++i) {
vertex = arc[i];
x += vertex[0];
y += vertex[1];
vertex[0] = x;
vertex[1] = y;
ol.format.TopoJSON.transformVertex_(vertex, scale, translate);
}
};
/**
* Apply a linear transform to a vertex. The provided vertex is modified in
* place.
*
* @param {ol.Coordinate} vertex Vertex.
* @param {Array.<number>} scale Scale for each dimension.
* @param {Array.<number>} translate Translation for each dimension.
* @private
*/
ol.format.TopoJSON.transformVertex_ = function(vertex, scale, translate) {
vertex[0] = vertex[0] * scale[0] + translate[0];
vertex[1] = vertex[1] * scale[1] + translate[1];
};
/**
* Read the projection from a TopoJSON source.
*
* @function
* @param {ArrayBuffer|Document|Node|Object|string} object Source.
* @return {ol.proj.Projection} Projection.
* @api stable
*/
ol.format.TopoJSON.prototype.readProjection = function(object) {
return this.defaultDataProjection;
};
/**
* @const
* @private
* @type {Object.<string, function(TopoJSONGeometry, Array, ...[Array]): ol.geom.Geometry>}
*/
ol.format.TopoJSON.GEOMETRY_READERS_ = {
'Point': ol.format.TopoJSON.readPointGeometry_,
'LineString': ol.format.TopoJSON.readLineStringGeometry_,
'Polygon': ol.format.TopoJSON.readPolygonGeometry_,
'MultiPoint': ol.format.TopoJSON.readMultiPointGeometry_,
'MultiLineString': ol.format.TopoJSON.readMultiLineStringGeometry_,
'MultiPolygon': ol.format.TopoJSON.readMultiPolygonGeometry_
};
OpenLayers 3