浅念
131 lines
3.5 KiB
JavaScript
131 lines
3.5 KiB
JavaScript
var LatLng = require('./LatLng');
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/*****************************************************************************
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* LatLngBounds Class
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*****************************************************************************/
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var LatLngBounds = function () {
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Object.defineProperty(this, 'type', {
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value: 'LatLngBounds',
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writable: false
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});
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var args = [];
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if (arguments.length === 1 &&
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typeof arguments[0] === 'object' &&
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'push' in arguments[0]) {
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args = arguments[0];
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} else {
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args = Array.prototype.slice.call(arguments, 0);
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}
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for (var i = 0; i < args.length; i++) {
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if (args[i] && 'lat' in args[i] && 'lng' in args[i]) {
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this.extend(args[i]);
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}
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}
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};
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LatLngBounds.prototype.northeast = null;
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LatLngBounds.prototype.southwest = null;
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LatLngBounds.prototype.toString = function () {
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return '{"southwest":' + this.southwest.toString() + ', "northeast":' + this.northeast.toString() + '}';
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};
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LatLngBounds.prototype.toUrlValue = function (precision) {
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precision = precision || 6;
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return '[' + this.southwest.toUrlValue(precision) + ',' + this.northeast.toUrlValue(precision) + ']';
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};
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LatLngBounds.prototype.extend = function (latLng) {
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if (latLng && 'lat' in latLng && 'lng' in latLng) {
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if (!this.southwest && !this.northeast) {
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this.southwest = latLng;
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this.northeast = latLng;
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} else {
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var south = Math.min(latLng.lat, this.southwest.lat);
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var north = Math.max(latLng.lat, this.northeast.lat);
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var west = this.southwest.lng,
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east = this.northeast.lng;
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if (west > 0 && east < 0) {
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if (latLng.lng > 0) {
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west = Math.min(latLng.lng, west);
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} else {
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east = Math.max(latLng.lng, east);
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}
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} else {
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west = Math.min(latLng.lng, this.southwest.lng);
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east = Math.max(latLng.lng, this.northeast.lng);
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}
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delete this.southwest;
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delete this.northeast;
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this.southwest = new LatLng(south, west);
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this.northeast = new LatLng(north, east);
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}
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}
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};
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LatLngBounds.prototype.getCenter = function () {
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var centerLat = (this.southwest.lat + this.northeast.lat) / 2;
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var swLng = this.southwest.lng;
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var neLng = this.northeast.lng;
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var sumLng = swLng + neLng;
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var centerLng = sumLng / 2;
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if ((swLng > 0 && neLng < 0 && sumLng < 180)) {
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centerLng += sumLng > 0 ? -180 : 180;
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}
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return new LatLng(centerLat, centerLng);
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};
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LatLngBounds.prototype.contains = function (latLng) {
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if (!latLng || !('lat' in latLng) || !('lng' in latLng)) {
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return false;
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}
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var y = latLng.lat,
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x = latLng.lng;
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var y90 = y + 90;
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var south = this.southwest.lat,
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north = this.northeast.lat,
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west = this.southwest.lng,
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east = this.northeast.lng;
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var south90 = south + 90,
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north90 = north + 90;
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var containX = false,
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containY = false;
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if (west <= 0 && east <= 0 && west <= east) {
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if (x > 0) {
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containX = false;
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} else {
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containX = (west <= x && x <= east);
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}
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} else if (east <= 0 && west > 0 && east <= west) {
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if (x > 0) {
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containX = (x >= west && x <= 180);
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} else {
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containX = (-180 <= x && x <= west);
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}
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} else if (west <= 0 && east > 0 && west <= east) {
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if (x < 0) {
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containX = (west <= x && x <= 0);
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} else {
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containX = (x >= 0 && x <= east);
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}
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} else {
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containX = (west <= x && x <= east);
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}
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containY = (south90 <= y90 && y90 <= north90) || //#a
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(south >= 0 && north <= 0 && ((south <= y && y <= 90) || (y >= -90 && y <= north))); // #d
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return containX && containY;
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};
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module.exports = LatLngBounds;
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