127 lines
No EOL
3.9 KiB
JavaScript
127 lines
No EOL
3.9 KiB
JavaScript
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/*****************************************
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FUNCTIONS
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******************************************/
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exports.rad = function (x) {
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return x * Math.PI / 180;
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};
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/*
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@param p1: {lat:X,lng:Y}
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@param p2: {lat:X,lng:Y}
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*/
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exports.get_distance = function (p1, p2) {
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var R = 6378137; // Earth’s mean radius in meter
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var dLat = exports.rad(p2.lat - p1.lat);
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var dLong = exports.rad(p2.lng - p1.lng);
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var a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
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Math.cos(exports.rad(p1.lat)) * Math.cos(exports.rad(p2.lat)) *
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Math.sin(dLong / 2) * Math.sin(dLong / 2);
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var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
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var d = R * c;
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return d; // returns the distance in meter
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};
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exports.send = function (socket, msg) {
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socket.write(msg);
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};
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exports.parse_data = function (data) {
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data = data.replace(/(\r\n|\n|\r)/gm, ''); //Remove 3 type of break lines
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var cmd_start = data.indexOf('B'); //al the incomming messages has a cmd starting with 'B'
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if (cmd_start > 13)throw 'Device ID is longer than 12 chars!';
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var parts = {
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'start': data.substr(0, 1),
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'device_id': data.substring(1, cmd_start),
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'cmd': data.substr(cmd_start, 4),
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'data': data.substring(cmd_start + 4, data.length - 1),
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'finish': data.substr(data.length - 1, 1)
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};
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return parts;
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};
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exports.parse_gps_data = function (str) {
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var data = {
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'date': str.substr(0, 6),
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'availability': str.substr(6, 1),
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'latitude': gps_minute_to_decimal(parseFloat(str.substr(7, 9))),
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'latitude_i': str.substr(16, 1),
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'longitude': gps_minute_to_decimal(parseFloat(str.substr(17, 9))),
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'longitude_i': str.substr(27, 1),
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'speed': str.substr(28, 5),
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'time': str.substr(33, 6),
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'orientation': str.substr(39, 6),
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'io_state': str.substr(45, 8),
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'mile_post': str.substr(53, 1),
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'mile_data': parseInt(str.substr(54, 8), 16)
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};
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return data;
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};
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exports.send_to = function (socket, cmd, data) {
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if (typeof(socket.device_id) == 'undefined')throw 'The socket is not paired with a device_id yet';
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var str = gps_format.start;
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str += socket.device_id + gps_format.separator + cmd;
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if (typeof(data) != 'undefined') str += gps_format.separator + data;
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str += gps_format.end;
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send(socket, str);
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//Example: (<DEVICE_ID>|<CMD>|<DATA>) - separator: | ,start: (, end: )
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};
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exports.minute_to_decimal = function (pos, pos_i) {
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if (typeof(pos_i) === 'undefined') pos_i = 'N';
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var dg = parseInt(pos / 100);
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var minutes = pos - (dg * 100);
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var res = (minutes / 60) + dg;
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return (pos_i.toUpperCase() === 'S' || pos_i.toUpperCase() === 'W') ? res * -1 : res;
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};
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// Send a message to all clients
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exports.broadcast = function (message, sender) {
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clients.forEach(function (client) {
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if (client === sender) return;
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client.write(message);
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});
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process.stdout.write(message + '\n');
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};
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exports.data_to_hex_array = function (data) {
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var arr = [];
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for (var i = 0; i < data.length; i++)arr.push(data[i].toString(16));
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return arr;
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};
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/* RETRUN AN INTEGER FROM A HEX CHAR OR integer */
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exports.hex_to_int = function (hex_char) {
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return parseInt(hex_char, 16);
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};
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exports.sum_hex_array = function (hex_array) {
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var sum = 0;
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for (var i in hex_array)sum += exports.hex_to_int(hex_array[i]);
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return sum;
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};
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exports.hex_array_to_hex_str = function (hex_array) {
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var str = '';
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for (var i in hex_array) {
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var char;
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if (typeof(hex_array[i]) === 'number') char = hex_array[i].toString(16);
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else char = hex_array[i].toString();
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str += exports.str_pad(char, 2, '0');
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}
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return str;
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};
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exports.str_pad = function (input, length, string) {
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string = string || '0';
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input = input + '';
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return input.length >= length ? input : new Array(length - input.length + 1).join(string) + input;
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};
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exports.crc_itu_get_verification = function (hex_data) {
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var crc16 = require('crc-itu').crc16;
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if (typeof(hex_data) === 'String') str = hex_data;
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else str = exports.hex_array_to_hex_str(hex_data);
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return crc16(str, 'hex');
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}; |