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qwen/nodejs/node_modules/wkx/lib/polygon.js

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+module.exports = Polygon;
+
+var util = require('util');
+
+var Geometry = require('./geometry');
+var Types = require('./types');
+var Point = require('./point');
+var BinaryWriter = require('./binarywriter');
+
+function Polygon(exteriorRing, interiorRings, srid) {
+    Geometry.call(this);
+
+    this.exteriorRing = exteriorRing || [];
+    this.interiorRings = interiorRings || [];
+	this.srid = srid;
+
+    if (this.exteriorRing.length > 0) {
+        this.hasZ = this.exteriorRing[0].hasZ;
+        this.hasM = this.exteriorRing[0].hasM;
+    }
+}
+
+util.inherits(Polygon, Geometry);
+
+Polygon.Z = function (exteriorRing, interiorRings, srid) {
+    var polygon = new Polygon(exteriorRing, interiorRings, srid);
+    polygon.hasZ = true;
+    return polygon;
+};
+
+Polygon.M = function (exteriorRing, interiorRings, srid) {
+    var polygon = new Polygon(exteriorRing, interiorRings, srid);
+    polygon.hasM = true;
+    return polygon;
+};
+
+Polygon.ZM = function (exteriorRing, interiorRings, srid) {
+    var polygon = new Polygon(exteriorRing, interiorRings, srid);
+    polygon.hasZ = true;
+    polygon.hasM = true;
+    return polygon;
+};
+
+Polygon._parseWkt = function (value, options) {
+    var polygon = new Polygon();
+    polygon.srid = options.srid;
+    polygon.hasZ = options.hasZ;
+    polygon.hasM = options.hasM;
+
+    if (value.isMatch(['EMPTY']))
+        return polygon;
+
+    value.expectGroupStart();
+
+    value.expectGroupStart();
+    polygon.exteriorRing.push.apply(polygon.exteriorRing, value.matchCoordinates(options));
+    value.expectGroupEnd();
+
+    while (value.isMatch([','])) {
+        value.expectGroupStart();
+        polygon.interiorRings.push(value.matchCoordinates(options));
+        value.expectGroupEnd();
+    }
+
+    value.expectGroupEnd();
+
+    return polygon;
+};
+
+Polygon._parseWkb = function (value, options) {
+    var polygon = new Polygon();
+    polygon.srid = options.srid;
+    polygon.hasZ = options.hasZ;
+    polygon.hasM = options.hasM;
+
+    var ringCount = value.readUInt32();
+
+    if (ringCount > 0) {
+        var exteriorRingCount = value.readUInt32();
+
+        for (var i = 0; i < exteriorRingCount; i++)
+            polygon.exteriorRing.push(Point._readWkbPoint(value, options));
+
+        for (i = 1; i < ringCount; i++) {
+            var interiorRing = [];
+
+            var interiorRingCount = value.readUInt32();
+
+            for (var j = 0; j < interiorRingCount; j++)
+                interiorRing.push(Point._readWkbPoint(value, options));
+
+            polygon.interiorRings.push(interiorRing);
+        }
+    }
+
+    return polygon;
+};
+
+Polygon._parseTwkb = function (value, options) {
+    var polygon = new Polygon();
+    polygon.hasZ = options.hasZ;
+    polygon.hasM = options.hasM;
+
+    if (options.isEmpty)
+        return polygon;
+
+    var previousPoint = new Point(0, 0, options.hasZ ? 0 : undefined, options.hasM ? 0 : undefined);
+    var ringCount = value.readVarInt();
+    var exteriorRingCount = value.readVarInt();
+
+    for (var i = 0; i < exteriorRingCount; i++)
+        polygon.exteriorRing.push(Point._readTwkbPoint(value, options, previousPoint));
+
+    for (i = 1; i < ringCount; i++) {
+        var interiorRing = [];
+
+        var interiorRingCount = value.readVarInt();
+
+        for (var j = 0; j < interiorRingCount; j++)
+            interiorRing.push(Point._readTwkbPoint(value, options, previousPoint));
+
+        polygon.interiorRings.push(interiorRing);
+    }
+
+    return polygon;
+};
+
+Polygon._parseGeoJSON = function (value) {
+    var polygon = new Polygon();
+
+    if (value.coordinates.length > 0 && value.coordinates[0].length > 0)
+        polygon.hasZ = value.coordinates[0][0].length > 2;
+
+    for (var i = 0; i < value.coordinates.length; i++) {
+        if (i > 0)
+            polygon.interiorRings.push([]);
+
+        for (var j = 0; j  < value.coordinates[i].length; j++) {
+            if (i === 0)
+                polygon.exteriorRing.push(Point._readGeoJSONPoint(value.coordinates[i][j]));
+            else
+                polygon.interiorRings[i - 1].push(Point._readGeoJSONPoint(value.coordinates[i][j]));
+        }
+    }
+
+    return polygon;
+};
+
+Polygon.prototype.toWkt = function () {
+    if (this.exteriorRing.length === 0)
+        return this._getWktType(Types.wkt.Polygon, true);
+
+    return this._getWktType(Types.wkt.Polygon, false) + this._toInnerWkt();
+};
+
+Polygon.prototype._toInnerWkt = function () {
+    var innerWkt = '((';
+
+    for (var i = 0; i < this.exteriorRing.length; i++)
+        innerWkt += this._getWktCoordinate(this.exteriorRing[i]) + ',';
+
+    innerWkt = innerWkt.slice(0, -1);
+    innerWkt += ')';
+
+    for (i = 0; i < this.interiorRings.length; i++) {
+        innerWkt += ',(';
+
+        for (var j = 0; j < this.interiorRings[i].length; j++) {
+            innerWkt += this._getWktCoordinate(this.interiorRings[i][j]) + ',';
+        }
+
+        innerWkt = innerWkt.slice(0, -1);
+        innerWkt += ')';
+    }
+
+    innerWkt += ')';
+
+    return innerWkt;
+};
+
+Polygon.prototype.toWkb = function (parentOptions) {
+    var wkb = new BinaryWriter(this._getWkbSize());
+
+    wkb.writeInt8(1);
+
+    this._writeWkbType(wkb, Types.wkb.Polygon, parentOptions);
+
+    if (this.exteriorRing.length > 0) {
+        wkb.writeUInt32LE(1 + this.interiorRings.length);
+        wkb.writeUInt32LE(this.exteriorRing.length);
+    }
+    else {
+        wkb.writeUInt32LE(0);
+    }
+
+    for (var i = 0; i < this.exteriorRing.length; i++)
+        this.exteriorRing[i]._writeWkbPoint(wkb);
+
+    for (i = 0; i < this.interiorRings.length; i++) {
+        wkb.writeUInt32LE(this.interiorRings[i].length);
+
+        for (var j = 0; j < this.interiorRings[i].length; j++)
+            this.interiorRings[i][j]._writeWkbPoint(wkb);
+    }
+
+    return wkb.buffer;
+};
+
+Polygon.prototype.toTwkb = function () {
+    var twkb = new BinaryWriter(0, true);
+
+    var precision = Geometry.getTwkbPrecision(5, 0, 0);
+    var isEmpty = this.exteriorRing.length === 0;
+
+    this._writeTwkbHeader(twkb, Types.wkb.Polygon, precision, isEmpty);
+
+    if (this.exteriorRing.length > 0) {
+        twkb.writeVarInt(1 + this.interiorRings.length);
+
+        twkb.writeVarInt(this.exteriorRing.length);
+
+        var previousPoint = new Point(0, 0, 0, 0);
+        for (var i = 0; i < this.exteriorRing.length; i++)
+            this.exteriorRing[i]._writeTwkbPoint(twkb, precision, previousPoint);
+
+        for (i = 0; i < this.interiorRings.length; i++) {
+            twkb.writeVarInt(this.interiorRings[i].length);
+
+            for (var j = 0; j < this.interiorRings[i].length; j++)
+                this.interiorRings[i][j]._writeTwkbPoint(twkb, precision, previousPoint);
+        }
+    }
+
+    return twkb.buffer;
+};
+
+Polygon.prototype._getWkbSize = function () {
+    var coordinateSize = 16;
+
+    if (this.hasZ)
+        coordinateSize += 8;
+    if (this.hasM)
+        coordinateSize += 8;
+
+    var size = 1 + 4 + 4;
+
+    if (this.exteriorRing.length > 0)
+        size += 4 + (this.exteriorRing.length * coordinateSize);
+
+    for (var i = 0; i < this.interiorRings.length; i++)
+        size += 4 + (this.interiorRings[i].length * coordinateSize);
+
+    return size;
+};
+
+Polygon.prototype.toGeoJSON = function (options) {
+    var geoJSON = Geometry.prototype.toGeoJSON.call(this, options);
+    geoJSON.type = Types.geoJSON.Polygon;
+    geoJSON.coordinates = [];
+
+    if (this.exteriorRing.length > 0) {
+        var exteriorRing = [];
+
+        for (var i = 0; i < this.exteriorRing.length; i++) {
+            if (this.hasZ)
+                exteriorRing.push([this.exteriorRing[i].x, this.exteriorRing[i].y, this.exteriorRing[i].z]);
+            else
+                exteriorRing.push([this.exteriorRing[i].x, this.exteriorRing[i].y]);
+        }
+
+        geoJSON.coordinates.push(exteriorRing);
+    }
+
+    for (var j = 0; j < this.interiorRings.length; j++) {
+        var interiorRing = [];
+
+        for (var k = 0; k < this.interiorRings[j].length; k++) {
+            if (this.hasZ)
+                interiorRing.push([this.interiorRings[j][k].x, this.interiorRings[j][k].y, this.interiorRings[j][k].z]);
+            else
+                interiorRing.push([this.interiorRings[j][k].x, this.interiorRings[j][k].y]);
+        }
+
+        geoJSON.coordinates.push(interiorRing);
+    }
+
+    return geoJSON;
+};