385 lines
12 KiB
JavaScript
385 lines
12 KiB
JavaScript
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module.exports = Geometry;
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var Types = require('./types');
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var Point = require('./point');
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var LineString = require('./linestring');
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var Polygon = require('./polygon');
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var MultiPoint = require('./multipoint');
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var MultiLineString = require('./multilinestring');
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var MultiPolygon = require('./multipolygon');
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var GeometryCollection = require('./geometrycollection');
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var BinaryReader = require('./binaryreader');
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var BinaryWriter = require('./binarywriter');
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var WktParser = require('./wktparser');
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var ZigZag = require('./zigzag.js');
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function Geometry() {
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this.srid = undefined;
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this.hasZ = false;
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this.hasM = false;
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}
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Geometry.parse = function (value, options) {
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var valueType = typeof value;
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if (valueType === 'string' || value instanceof WktParser)
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return Geometry._parseWkt(value);
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else if (Buffer.isBuffer(value) || value instanceof BinaryReader)
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return Geometry._parseWkb(value, options);
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else
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throw new Error('first argument must be a string or Buffer');
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};
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Geometry._parseWkt = function (value) {
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var wktParser,
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srid;
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if (value instanceof WktParser)
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wktParser = value;
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else
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wktParser = new WktParser(value);
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var match = wktParser.matchRegex([/^SRID=(\d+);/]);
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if (match)
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srid = parseInt(match[1], 10);
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var geometryType = wktParser.matchType();
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var dimension = wktParser.matchDimension();
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var options = {
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srid: srid,
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hasZ: dimension.hasZ,
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hasM: dimension.hasM
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};
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switch (geometryType) {
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case Types.wkt.Point:
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return Point._parseWkt(wktParser, options);
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case Types.wkt.LineString:
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return LineString._parseWkt(wktParser, options);
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case Types.wkt.Polygon:
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return Polygon._parseWkt(wktParser, options);
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case Types.wkt.MultiPoint:
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return MultiPoint._parseWkt(wktParser, options);
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case Types.wkt.MultiLineString:
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return MultiLineString._parseWkt(wktParser, options);
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case Types.wkt.MultiPolygon:
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return MultiPolygon._parseWkt(wktParser, options);
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case Types.wkt.GeometryCollection:
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return GeometryCollection._parseWkt(wktParser, options);
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}
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};
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Geometry._parseWkb = function (value, parentOptions) {
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var binaryReader,
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wkbType,
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geometryType,
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options = {};
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if (value instanceof BinaryReader)
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binaryReader = value;
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else
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binaryReader = new BinaryReader(value);
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binaryReader.isBigEndian = !binaryReader.readInt8();
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wkbType = binaryReader.readUInt32();
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options.hasSrid = (wkbType & 0x20000000) === 0x20000000;
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options.isEwkb = (wkbType & 0x20000000) || (wkbType & 0x40000000) || (wkbType & 0x80000000);
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if (options.hasSrid)
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options.srid = binaryReader.readUInt32();
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options.hasZ = false;
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options.hasM = false;
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if (!options.isEwkb && (!parentOptions || !parentOptions.isEwkb)) {
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if (wkbType >= 1000 && wkbType < 2000) {
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options.hasZ = true;
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geometryType = wkbType - 1000;
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}
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else if (wkbType >= 2000 && wkbType < 3000) {
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options.hasM = true;
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geometryType = wkbType - 2000;
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}
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else if (wkbType >= 3000 && wkbType < 4000) {
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options.hasZ = true;
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options.hasM = true;
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geometryType = wkbType - 3000;
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}
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else {
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geometryType = wkbType;
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}
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}
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else {
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if (wkbType & 0x80000000)
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options.hasZ = true;
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if (wkbType & 0x40000000)
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options.hasM = true;
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geometryType = wkbType & 0xF;
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}
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switch (geometryType) {
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case Types.wkb.Point:
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return Point._parseWkb(binaryReader, options);
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case Types.wkb.LineString:
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return LineString._parseWkb(binaryReader, options);
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case Types.wkb.Polygon:
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return Polygon._parseWkb(binaryReader, options);
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case Types.wkb.MultiPoint:
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return MultiPoint._parseWkb(binaryReader, options);
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case Types.wkb.MultiLineString:
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return MultiLineString._parseWkb(binaryReader, options);
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case Types.wkb.MultiPolygon:
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return MultiPolygon._parseWkb(binaryReader, options);
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case Types.wkb.GeometryCollection:
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return GeometryCollection._parseWkb(binaryReader, options);
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default:
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throw new Error('GeometryType ' + geometryType + ' not supported');
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}
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};
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Geometry.parseTwkb = function (value) {
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var binaryReader,
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options = {};
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if (value instanceof BinaryReader)
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binaryReader = value;
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else
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binaryReader = new BinaryReader(value);
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var type = binaryReader.readUInt8();
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var metadataHeader = binaryReader.readUInt8();
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var geometryType = type & 0x0F;
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options.precision = ZigZag.decode(type >> 4);
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options.precisionFactor = Math.pow(10, options.precision);
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options.hasBoundingBox = metadataHeader >> 0 & 1;
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options.hasSizeAttribute = metadataHeader >> 1 & 1;
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options.hasIdList = metadataHeader >> 2 & 1;
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options.hasExtendedPrecision = metadataHeader >> 3 & 1;
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options.isEmpty = metadataHeader >> 4 & 1;
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if (options.hasExtendedPrecision) {
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var extendedPrecision = binaryReader.readUInt8();
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options.hasZ = (extendedPrecision & 0x01) === 0x01;
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options.hasM = (extendedPrecision & 0x02) === 0x02;
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options.zPrecision = ZigZag.decode((extendedPrecision & 0x1C) >> 2);
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options.zPrecisionFactor = Math.pow(10, options.zPrecision);
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options.mPrecision = ZigZag.decode((extendedPrecision & 0xE0) >> 5);
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options.mPrecisionFactor = Math.pow(10, options.mPrecision);
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}
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else {
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options.hasZ = false;
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options.hasM = false;
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}
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if (options.hasSizeAttribute)
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binaryReader.readVarInt();
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if (options.hasBoundingBox) {
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var dimensions = 2;
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if (options.hasZ)
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dimensions++;
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if (options.hasM)
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dimensions++;
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for (var i = 0; i < dimensions; i++) {
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binaryReader.readVarInt();
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binaryReader.readVarInt();
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}
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}
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switch (geometryType) {
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case Types.wkb.Point:
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return Point._parseTwkb(binaryReader, options);
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case Types.wkb.LineString:
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return LineString._parseTwkb(binaryReader, options);
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case Types.wkb.Polygon:
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return Polygon._parseTwkb(binaryReader, options);
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case Types.wkb.MultiPoint:
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return MultiPoint._parseTwkb(binaryReader, options);
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case Types.wkb.MultiLineString:
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return MultiLineString._parseTwkb(binaryReader, options);
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case Types.wkb.MultiPolygon:
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return MultiPolygon._parseTwkb(binaryReader, options);
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case Types.wkb.GeometryCollection:
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return GeometryCollection._parseTwkb(binaryReader, options);
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default:
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throw new Error('GeometryType ' + geometryType + ' not supported');
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}
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};
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Geometry.parseGeoJSON = function (value) {
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return Geometry._parseGeoJSON(value);
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};
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Geometry._parseGeoJSON = function (value, isSubGeometry) {
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var geometry;
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switch (value.type) {
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case Types.geoJSON.Point:
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geometry = Point._parseGeoJSON(value); break;
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case Types.geoJSON.LineString:
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geometry = LineString._parseGeoJSON(value); break;
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case Types.geoJSON.Polygon:
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geometry = Polygon._parseGeoJSON(value); break;
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case Types.geoJSON.MultiPoint:
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geometry = MultiPoint._parseGeoJSON(value); break;
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case Types.geoJSON.MultiLineString:
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geometry = MultiLineString._parseGeoJSON(value); break;
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case Types.geoJSON.MultiPolygon:
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geometry = MultiPolygon._parseGeoJSON(value); break;
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case Types.geoJSON.GeometryCollection:
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geometry = GeometryCollection._parseGeoJSON(value); break;
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default:
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throw new Error('GeometryType ' + value.type + ' not supported');
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}
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if (value.crs && value.crs.type && value.crs.type === 'name' && value.crs.properties && value.crs.properties.name) {
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var crs = value.crs.properties.name;
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if (crs.indexOf('EPSG:') === 0)
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geometry.srid = parseInt(crs.substring(5));
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else if (crs.indexOf('urn:ogc:def:crs:EPSG::') === 0)
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geometry.srid = parseInt(crs.substring(22));
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else
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throw new Error('Unsupported crs: ' + crs);
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}
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else if (!isSubGeometry) {
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geometry.srid = 4326;
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}
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return geometry;
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};
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Geometry.prototype.toEwkt = function () {
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return 'SRID=' + this.srid + ';' + this.toWkt();
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};
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Geometry.prototype.toEwkb = function () {
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var ewkb = new BinaryWriter(this._getWkbSize() + 4);
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var wkb = this.toWkb();
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ewkb.writeInt8(1);
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ewkb.writeUInt32LE((wkb.slice(1, 5).readUInt32LE(0) | 0x20000000) >>> 0, true);
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ewkb.writeUInt32LE(this.srid);
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ewkb.writeBuffer(wkb.slice(5));
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return ewkb.buffer;
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};
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Geometry.prototype._getWktType = function (wktType, isEmpty) {
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var wkt = wktType;
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if (this.hasZ && this.hasM)
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wkt += ' ZM ';
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else if (this.hasZ)
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wkt += ' Z ';
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else if (this.hasM)
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wkt += ' M ';
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if (isEmpty && !this.hasZ && !this.hasM)
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wkt += ' ';
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if (isEmpty)
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wkt += 'EMPTY';
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return wkt;
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};
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Geometry.prototype._getWktCoordinate = function (point) {
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var coordinates = point.x + ' ' + point.y;
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if (this.hasZ)
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coordinates += ' ' + point.z;
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if (this.hasM)
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coordinates += ' ' + point.m;
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return coordinates;
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};
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Geometry.prototype._writeWkbType = function (wkb, geometryType, parentOptions) {
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var dimensionType = 0;
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if (typeof this.srid === 'undefined' && (!parentOptions || typeof parentOptions.srid === 'undefined')) {
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if (this.hasZ && this.hasM)
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dimensionType += 3000;
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else if (this.hasZ)
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dimensionType += 1000;
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else if (this.hasM)
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dimensionType += 2000;
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}
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else {
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if (this.hasZ)
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dimensionType |= 0x80000000;
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if (this.hasM)
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dimensionType |= 0x40000000;
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}
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wkb.writeUInt32LE((dimensionType + geometryType) >>> 0, true);
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};
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Geometry.getTwkbPrecision = function (xyPrecision, zPrecision, mPrecision) {
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return {
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xy: xyPrecision,
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z: zPrecision,
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m: mPrecision,
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xyFactor: Math.pow(10, xyPrecision),
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zFactor: Math.pow(10, zPrecision),
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mFactor: Math.pow(10, mPrecision)
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};
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};
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Geometry.prototype._writeTwkbHeader = function (twkb, geometryType, precision, isEmpty) {
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var type = (ZigZag.encode(precision.xy) << 4) + geometryType;
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var metadataHeader = (this.hasZ || this.hasM) << 3;
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metadataHeader += isEmpty << 4;
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twkb.writeUInt8(type);
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twkb.writeUInt8(metadataHeader);
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if (this.hasZ || this.hasM) {
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var extendedPrecision = 0;
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if (this.hasZ)
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extendedPrecision |= 0x1;
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if (this.hasM)
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extendedPrecision |= 0x2;
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twkb.writeUInt8(extendedPrecision);
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}
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};
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Geometry.prototype.toGeoJSON = function (options) {
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var geoJSON = {};
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if (this.srid) {
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if (options) {
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if (options.shortCrs) {
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geoJSON.crs = {
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type: 'name',
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properties: {
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name: 'EPSG:' + this.srid
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}
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};
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}
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else if (options.longCrs) {
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geoJSON.crs = {
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type: 'name',
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properties: {
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name: 'urn:ogc:def:crs:EPSG::' + this.srid
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}
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};
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}
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}
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}
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return geoJSON;
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};
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