mirror of https://github.com/espruino/BangleApps
gpsservice and two watch faces for gps and grid reference info
hughbarney
parent
04dad49e6f
commit
8af4646340
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# GPS Service
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A configurable GPS widget that runs in the background.
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## Goals
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The goals of this project were to develop a GPS widget that could be
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ran in low power mode in the background and could be used to display
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a OS grid reference in a watch face.
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* Using an App that turns on the GPS and constantly displays the
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screen will use around 75mA, the battery will last between 3-4
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hours.
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* Using the GPS in a Widget in Super-E Power Saving Mode (PSM) with
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the screen off (most of the time) will consume around 35mA and you
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might get 10hrs before a recharge.
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* Using the GPS in Power Saving Mode On/Off (PSMOO) with suitable
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settings can reduce the average consumption to around 15mA.
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## Settings
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The Settings App enables you set the following options for the GPS Service.
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* GPS - On/Off. When this value is changed the GPS Service will be
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powered on or off and the GPS Widget will be displayed.
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* Power Mode:
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** PSM-Super-E - the factory default setup for the GPS. The
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recommended power saving mode.
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** PSMOO - On/Off power saving mode. Configured by interval and
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search time. Choose this mode if you are happy to get a GPS
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position update less often (say every 1 or 2 minutes). The longer
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the interval the more time the GPS will spend sleeping in low
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power mode (7mA) between obtaining fixes (35mA). For walking in
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open country an update once every 60 seconds is adequate to put
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you within a 6 digit grid refernce sqaure.
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Bangle.loadWidgets();
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Bangle.drawWidgets();
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const SETTINGS_FILE = "gpsservice.settings.json";
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const POWER_OPTIONS = ['SuperE', 'PSMOO'];
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let settings = require("Storage").readJSON(SETTINGS_FILE,1)||{};
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function updateSettings() {
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require("Storage").write(SETTINGS_FILE, settings);
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}
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function reloadWidget() {
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if (WIDGETS.gpsservice)
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WIDGETS.gpsservice.reload();
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}
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function showMainMenu() {
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const mainmenu = {
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'': { 'title': 'GPS Service' },
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'< Exit': ()=>{load();},
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'GPS': {
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value: !!settings.service,
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format: v =>v?'On':'Off',
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onchange: v => {
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settings.service = v;
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updateSettings();
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reloadWidget(); // only when we change On/Off status
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},
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},
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'Period (s)': {
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value: settings.period,
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min: 1,
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max: 1800,
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step: 1,
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onchange: v => {
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settings.period =v;
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updateSettings();
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}
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},
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'Ontime (s)': {
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value: settings.ontime,
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min: 1,
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max: 65,
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step: 1,
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onchange: v => {
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settings.ontime = v;
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updateSettings();
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}
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},
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'Rate (s)': {
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value: settings.period,
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min: 1,
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max: 60,
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step: 1,
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onchange: v => {
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settings.rate = v;
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updateSettings();
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}
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},
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'< Back': ()=>{load();}
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};
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return E.showMenu(mainmenu);
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}
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showMainMenu();
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require("heatshrink").decompress(atob("mEwghC/AH4AKg9wC6t3u4uVC6wWBI6t3uJeVuMQCqcBLisAi4XLxAABFxAXKgc4DBAuBRhQXEDAq7MmYXEwBHEXZYXFGAOqAAKDMmczC4mIC62CC50PC4JIBkQABiIvRmURAAUSjQXSFwMoxGKC6CRFwUSVYgXLPIgXXwMYegoXLJAYXCGBnzGA0hPQIwMgYwGC6gwCC4ZIMC4gYBC604C4ZISmcRVgapQAAMhC6GIJIwXCMBcIxGDDBAuLC4IwGAARGMAAQWGmAXPJQoWMC4pwCCpoXJAB4XXAH4A/ABQA="))
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Binary file not shown.
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After Width: | Height: | Size: 1.5 KiB |
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(function(back) {
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// just go right to our app
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load("gpsservice.app.js");
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})();
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/*
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test bed for working out lowest power consumption, with workable GPS
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Load into IDE and upload code to RAM when connected to watch
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*/
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Bangle.on('GPS-raw',function (d) {
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if (d[0]=="$") return;
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if (d.startsWith("\xB5\x62\x05\x01")) print("GPS ACK");
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else if (d.startsWith("\xB5\x62\x05\x00")) print("GPS NACK");
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// 181,98 sync chars
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else print("GPS",E.toUint8Array(d).join(","));
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});
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function writeGPScmd(cmd) {
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var d = [0xB5,0x62]; // sync chars
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d = d.concat(cmd);
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var a=0,b=0;
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for (var i=2;i<d.length;i++) {
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a += d[i];
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b += a;
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}
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d.push(a&255,b&255);
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console.log(d);
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Serial1.write(d);
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}
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// quick hack
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function wait(ms){
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var start = new Date().getTime();
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var end = start;
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while(end < start + ms) {
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end = new Date().getTime();
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}
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}
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/*
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* gps_disable_nmea_output
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*
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* disables all NMEA messages to be output from the GPS.
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* even though the parser can cope with NMEA messages and ignores them, it
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* may save power to disable them completely.
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*
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*
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* DO NOT USE
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* HB: This is a bad idea on a Bangle JS
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* You wont get any fixes if you call this function
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*
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*
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*/
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function UBX_CFG_DISABLE_NMEA() {
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writeGPScmd([0x06, 0x00, /* UBX-CFG-PRT */
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20, 0x00,
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0x01, 0x00, 0x00, 0x00, /* UART1, reserved, no TX ready */
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0xe0, 0x08, 0x00, 0x00, /* UART mode (8N1) */
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0x80, 0x25, 0x00, 0x00, /* UART baud rate (9600) */
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0x01, 0x00, /* input protocols (uBx only) */
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0x01, 0x00, /* output protocols (uBx only) */
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0x00, 0x00, /* flags */
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0x00, 0x00]); /* reserved */
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}
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/*
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* gps_disable_nmea_output
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*
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* disables all NMEA messages to be output from the GPS.
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* even though the parser can cope with NMEA messages and ignores them, it
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* may save power to disable them completely.
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*
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* Can use this to switch NMEA back on if you call
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* UBX_CFG_DISABLE_NMEA()
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*
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*/
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function UBX_CFG_RESTORE_NMEA() {
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writeGPScmd([0x06, 0x00, /* UBX-CFG-PRT */
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20, 0x00,
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0x01, 0x00, 0x00, 0x00, /* UART1, reserved, no TX ready */
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0xe0, 0x08, 0x00, 0x00, /* UART mode (8N1) */
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0x80, 0x25, 0x00, 0x00, /* UART baud rate (9600) */
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0x03, 0x00, /* input protocols (uBx only) */
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0x03, 0x00, /* output protocols (uBx only) */
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0x00, 0x00, /* flags */
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0x00, 0x00]); /* reserved */
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}
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function UBX_CFG_PMS() {
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// UBX-CFG-PMS - enable power management - Super-E
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writeGPScmd([0x06,0x86, // msg class + type
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8,0,//length
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0x00,0x03, 0,0, 0,0, 0,0]);
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}
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function UBX_CFG_INTERVAL(period, ontime) {
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writeGPScmd([0x06,0x86, // msg class + type
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8,0, //length
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//v0, interval period ontime reserved
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0x00, 0x02, period, 0, ontime, 0, 0, 0 ]);
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// the values are little endian, least significant byte first
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}
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/*
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* set update baud rate
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*
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* the setting is in milliseconds in 2 bytes, max 65 seconds
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* we are passing in a value in seconds
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* we set the most significant byte only
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* 8 seconds ~ 8192ms 0x2000, 0x20 = 32 = 4*8
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*
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*/
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function UBX_CFG_RATE(rate) {
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rate = (rate * 4) % 256;
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//console.log("rate=" + rate);
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writeGPScmd([0x06,0x08, // class, id
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0x06, 0, // length
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0x00, rate, // b0: 8192ms 0x2000, 0x00FF (~65sec)
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0x01, 0x00, // b2:
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0x01, 0x00]); // b4: timeref GPS
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}
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/*
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* Save configuration otherwise it will reset when the GPS wakes up
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*
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*/
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function UBX_CFG_SAVE() {
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writeGPScmd([0x06, 0x09, // class id
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0x0D, 0x00, // length
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0x00, 0x00, 0x00, 0x00, // clear mask
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0xFF, 0xFF, 0x00, 0x00, // save mask
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0x00, 0x00, 0x00, 0x00, // load mask
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0x07]); // b2=eeprom b1=flash b0=bat backed ram
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// code on github had 7 - all 3 set ?
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}
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/*
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* Reset to factory settings using clear mask in UBX_CFG_CFG
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* https://portal.u-blox.com/s/question/0D52p0000925T00CAE/ublox-max-m8q-getting-stuck-when-sleeping-with-extint-pin-control
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*/
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function UBX_CFG_RESET() {
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writeGPScmd([0x06, 0x09, // class id
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0x0D, 0x00,
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0xFF, 0xFB, 0x00, 0x00, // clear mask
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0x00, 0x00, 0x00, 0x00, // save mask
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0xFF, 0xFF, 0x00, 0x00, // load mask
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0x17]);
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}
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// convert an integer to an array of bytes
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function int_2_bytes( x ){
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var bytes = [];
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var i = 4;
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do {
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bytes[--i] = x & (255);
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x = x>>8;
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} while (i);
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return bytes;
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}
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/*
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* Extended Power Management
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* update and search are in seconds
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*
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* https://github.com/thasti/utrak/blob/master/gps.c
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*/
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function UBX_CFG_PM2(update,search) {
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var u = int_2_bytes(update*1000);
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var s = int_2_bytes(search*1000);
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writeGPScmd([0x06, 0x3B, /* class id */
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44, 0, /* length */
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0x01, 0x00, 0x00, 0x00, /* v1, reserved 1..3 */
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0x00, 0x10, 0x00, 0x00, /* on/off-mode, update ephemeris */
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// little endian, lsb first
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//0x30, 0x75, 0x00, 0x00, /* update period, ms, 120s=00 01 D4 C0, 30s= 00 00 75 30 */
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//0x88, 0x13, 0x00, 0x00, /* search period, ms, 120s, 20s = 00 00 4E 20, 5s = 13 88 */
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u[3], u[2], u[1], u[0], /* update period, ms, 120s=00 01 D4 C0, 30s= 00 00 75 30 */
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s[3], s[2], s[1], s[0], /* search period, ms, 120s, 20s = 00 00 4E 20, 5s = 13 88 */
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0x00, 0x00, 0x00, 0x00, /* grid offset */
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0x00, 0x00, /* on-time after first fix */
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0x01, 0x00, /* minimum acquisition time */
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0x00, 0x00, 0x00, 0x00, /* reserved 4,5 */
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0x00, 0x00, 0x00, 0x00, /* reserved 6 */
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0x00, 0x00, 0x00, 0x00, /* reserved 7 */
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0x00, 0x00, 0x00, 0x00, /* reserved 8,9,10 */
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0x00, 0x00, 0x00, 0x00]); /* reserved 11 */
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}
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// enable power saving mode, after configured with PM2
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function UBX_CFG_RXM() {
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writeGPScmd([0x06, 0x11, /* UBX-CFG-RXM */
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2, 0, /* length */
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0x08, 0x01]); /* reserved, enable power save mode */
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}
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function onGPS(fix) {
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console.log(fix);
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}
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function setupGPS() {
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Bangle.setGPSPower(1);
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UBX_CFG_RESET();
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wait(100);
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//UBX_CFG_RESTORE_NMEA();
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//wait(20);
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UBX_CFG_PM2(120,5);
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wait(20);
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UBX_CFG_RXM();
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wait(20);
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UBX_CFG_SAVE();
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wait(20);
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Bangle.on('GPS',onGPS);
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}
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@ -0,0 +1,233 @@
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(() => {
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var settings = {};
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var fixToggle = false; // toggles once for each reading
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var have_fix = false;
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var last_fix = {
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fix: 0,
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alt: 0,
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lat: 0,
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lon: 0,
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speed: 0,
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time: 0,
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satellites: 0
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};
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function gps_get_fix() { return last_fix; }
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function gps_get_status() { return WIDGETS.gpsservice.width === 24 ? true : false;}
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function gps_get_version() { return "0.2"; }
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// Called by the GPS widget settings to reload settings and decide what to do
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function reload() {
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settings = require("Storage").readJSON("gpsservice.settings.json",1)||{};
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settings.period = settings.period||12;
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settings.ontime = settings.ontime||5;
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//settings.rate = settings.rate||10;
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console.log(settings);
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Bangle.removeListener('GPS',onGPS);
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if (settings.service) {
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gps_power_on();
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} else {
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gps_power_off();
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}
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}
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function gps_power_on() {
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have_fix = false;
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fixToggle = false;
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setupGPS();
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WIDGETS.gpsservice.width = 24;
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}
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function gps_power_off() {
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Bangle.setGPSPower(0);
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have_fix = false;
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fixToggle = false;
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last_fix.fix = 0;
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WIDGETS.gpsservice.width = 0;
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}
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// quick hack
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function wait(ms){
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var start = new Date().getTime();
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var end = start;
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while(end < start + ms) {
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end = new Date().getTime();
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}
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}
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function setupGPS() {
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Bangle.setGPSPower(1);
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UBX_CFG_RESET();
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wait(100);
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UBX_CFG_PM2(settings.period, settings.ontime);
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wait(20);
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UBX_CFG_RXM();
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wait(20);
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UBX_CFG_SAVE();
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wait(20);
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Bangle.on('GPS',onGPS);
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}
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function writeGPScmd(cmd) {
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var d = [0xB5,0x62]; // sync chars
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d = d.concat(cmd);
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var a=0,b=0;
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for (var i=2;i<d.length;i++) {
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a += d[i];
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b += a;
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}
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d.push(a&255,b&255);
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Serial1.write(d);
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}
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// UBX-CFG-PMS - enable power management - Super-E
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function UBX_CFG_PMS() {
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writeGPScmd([0x06,0x86, // msg class + type
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8,0,//length
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0x00,0x03, 0,0, 0,0, 0,0]);
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}
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// convert an integer to an array of bytes
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function int_2_bytes( x ){
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var bytes = [];
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var i = 4;
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do {
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bytes[--i] = x & (255);
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x = x>>8;
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} while (i);
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return bytes;
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}
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/*
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* Extended Power Management
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* update and search are in milli seconds
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* settings are loaded little endian, lsb first
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*
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* https://github.com/thasti/utrak/blob/master/gps.c
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*/
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function UBX_CFG_PM2(update,search) {
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var u = int_2_bytes(update*1000);
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var s = int_2_bytes(search*1000);
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writeGPScmd([0x06, 0x3B, /* class id */
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44, 0, /* length */
|
||||
0x01, 0x00, 0x00, 0x00, /* v1, reserved 1..3 */
|
||||
0x00, 0x10, 0x00, 0x00, /* on/off-mode, update ephemeris */
|
||||
u[3], u[2], u[1], u[0], /* update period, ms, 120s=00 01 D4 C0, 30s= 00 00 75 30 */
|
||||
s[3], s[2], s[1], s[0], /* search period, ms, 120s, 20s = 00 00 4E 20, 5s = 13 88 */
|
||||
0x00, 0x00, 0x00, 0x00, /* grid offset */
|
||||
0x00, 0x00, /* on-time after first fix */
|
||||
0x01, 0x00, /* minimum acquisition time */
|
||||
0x00, 0x00, 0x00, 0x00, /* reserved 4,5 */
|
||||
0x00, 0x00, 0x00, 0x00, /* reserved 6 */
|
||||
0x00, 0x00, 0x00, 0x00, /* reserved 7 */
|
||||
0x00, 0x00, 0x00, 0x00, /* reserved 8,9,10 */
|
||||
0x00, 0x00, 0x00, 0x00]); /* reserved 11 */
|
||||
}
|
||||
|
||||
// enable power saving mode, after configured with PM2
|
||||
function UBX_CFG_RXM() {
|
||||
writeGPScmd([0x06, 0x11, /* UBX-CFG-RXM */
|
||||
2, 0, /* length */
|
||||
0x08, 0x01]); /* reserved, enable power save mode */
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Save configuration otherwise it will reset when the GPS wakes up
|
||||
*
|
||||
*/
|
||||
function UBX_CFG_SAVE() {
|
||||
writeGPScmd([0x06, 0x09, // class id
|
||||
0x0D, 0x00, // length
|
||||
0x00, 0x00, 0x00, 0x00, // clear mask
|
||||
0xFF, 0xFF, 0x00, 0x00, // save mask
|
||||
0x00, 0x00, 0x00, 0x00, // load mask
|
||||
0x07]); // b2=eeprom b1=flash b0=bat backed ram
|
||||
}
|
||||
|
||||
/*
|
||||
* Reset to factory settings using clear mask in UBX_CFG_CFG
|
||||
* https://portal.u-blox.com/s/question/0D52p0000925T00CAE/ublox-max-m8q-getting-stuck-when-sleeping-with-extint-pin-control
|
||||
*/
|
||||
function UBX_CFG_RESET() {
|
||||
writeGPScmd([0x06, 0x09, // class id
|
||||
0x0D, 0x00,
|
||||
0xFF, 0xFB, 0x00, 0x00, // clear mask
|
||||
0x00, 0x00, 0x00, 0x00, // save mask
|
||||
0xFF, 0xFF, 0x00, 0x00, // load mask
|
||||
0x17]);
|
||||
}
|
||||
|
||||
// draw the widget
|
||||
function draw() {
|
||||
g.reset();
|
||||
g.drawImage(atob("GBgCAAAAAAAAAAQAAAAAAD8AAAAAAP/AAAAAAP/wAAAAAH/8C9AAAB/8L/QAAAfwv/wAAAHS//wAAAAL//gAAAAf/+AAAAAf/4AAAAL//gAAAAD/+DwAAAB/Uf8AAAAfA//AAAACAf/wAAAAAH/0AAAAAB/wAAAAAAfAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"),this.x,this.y);
|
||||
if (gps_get_status() === true && have_fix) {
|
||||
g.setColor("#00FF00");
|
||||
g.drawImage(fixToggle ? atob("CgoCAAAAA0AAOAAD5AAPwAAAAAAAAAAAAAAAAA==") : atob("CgoCAAABw0AcOAHj5A8PwHwAAvgAB/wABUAAAA=="),this.x,this.y+14);
|
||||
} else {
|
||||
g.setColor("#0000FF");
|
||||
if (fixToggle) g.setFont("6x8").drawString("?",this.x,this.y+14);
|
||||
}
|
||||
}
|
||||
|
||||
function onGPS(fix) {
|
||||
fixToggle = !fixToggle;
|
||||
WIDGETS.gpsservice.draw();
|
||||
|
||||
last_fix.satellites = fix.satellites;
|
||||
|
||||
/*
|
||||
* If we have a fix record it, we will get another soon. Apps
|
||||
* will see the timestamp of the last fix and be able to work out
|
||||
* if it is stale. This means an App will always have the last
|
||||
* known fix, and we avoid saying no fix all the time.
|
||||
*
|
||||
*/
|
||||
if (fix.fix) {
|
||||
last_fix.fix = fix.fix;
|
||||
last_fix.alt = fix.alt;
|
||||
last_fix.lat = fix.lat;
|
||||
last_fix.lon = fix.lon;
|
||||
last_fix.speed = fix.speed;
|
||||
last_fix.time = fix.time;
|
||||
}
|
||||
}
|
||||
|
||||
// redraw when the LCD turns on
|
||||
Bangle.on('lcdPower', function(on) {
|
||||
if (on) WIDGETS.gpsservice.draw();
|
||||
});
|
||||
|
||||
// add the widget
|
||||
WIDGETS["gpsservice"]={
|
||||
area:"tl",
|
||||
width:24,
|
||||
draw:draw,
|
||||
gps_power_on:gps_power_on,
|
||||
gps_power_off:gps_power_off,
|
||||
gps_get_status:gps_get_status,
|
||||
gps_get_fix:gps_get_fix,
|
||||
gps_get_version:gps_get_version,
|
||||
reload:function() {
|
||||
reload();
|
||||
Bangle.drawWidgets(); // relayout all widgets
|
||||
}};
|
||||
|
||||
// load settings, set correct widget width
|
||||
reload();
|
||||
|
||||
})();
|
||||
|
||||
|
|
@ -0,0 +1,95 @@
|
|||
(() => {
|
||||
|
||||
function getFace(){
|
||||
|
||||
//var img = require("heatshrink").decompress(atob("mEwghC/AH4AKg9wC6t3u4uVC6wWBI6t3uJeVuMQCqcBLisAi4XLxAABFxAXKgc4DBAuBRhQXEDAq7MmYXEwBHEXZYXFGAOqAAKDMmczC4mIC62CC50PC4JIBkQABiIvRmURAAUSjQXSFwMoxGKC6CRFwUSVYgXLPIgXXwMYegoXLJAYXCGBnzGA0hPQIwMgYwGC6gwCC4ZIMC4gYBC604C4ZISmcRVgapQAAMhC6GIJIwXCMBcIxGDDBAuLC4IwGAARGMAAQWGmAXPJQoWMC4pwCCpoXJAB4XXAH4A/ABQA="));
|
||||
var nofix = 0;
|
||||
|
||||
function formatTime(now) {
|
||||
var fd = now.toUTCString().split(" ");
|
||||
return fd[4];
|
||||
}
|
||||
|
||||
|
||||
function timeSince(t) {
|
||||
var hms = t.split(":");
|
||||
var now = new Date();
|
||||
|
||||
var sn = 3600*(now.getHours()) + 60*(now.getMinutes()) + 1*(now.getSeconds());
|
||||
var st = 3600*(hms[0]) + 60*(hms[1]) + 1*(hms[2]);
|
||||
|
||||
return (sn - st);
|
||||
}
|
||||
|
||||
function draw() {
|
||||
var gps_on = false;
|
||||
|
||||
var fix = {
|
||||
fix: 0,
|
||||
alt: 0,
|
||||
lat: 0,
|
||||
lon: 0,
|
||||
speed: 0,
|
||||
time: 0,
|
||||
satellites: 0
|
||||
};
|
||||
|
||||
var y_line = 26;
|
||||
var y_start = 46;
|
||||
var x_start = 10;
|
||||
|
||||
// only attempt to get gps fix if gpsservuce is loaded
|
||||
if (WIDGETS.gpsservice !== undefined) {
|
||||
fix = WIDGETS.gpsservice.gps_get_fix();
|
||||
gps_on = WIDGETS.gpsservice.gps_get_status();
|
||||
}
|
||||
|
||||
g.reset();
|
||||
g.clearRect(0,24,239,239);
|
||||
|
||||
if (fix.fix) {
|
||||
var time = formatTime(fix.time);
|
||||
var age = timeSince(time);
|
||||
|
||||
g.setFontAlign(-1, -1);
|
||||
g.setFont("6x8");
|
||||
g.setFontVector(22);
|
||||
g.drawString("Alt: " + fix.alt +" m", x_start, y_start, true);
|
||||
g.drawString("Lat: "+ fix.lat, x_start, y_start + y_line, true);
|
||||
g.drawString("Lon: " + fix.lon, x_start, y_start + 2*y_line, true);
|
||||
g.drawString("Time: " + time, x_start, y_start + 3*y_line, true);
|
||||
g.drawString("Age(s): " + age, x_start, y_start + 4*y_line, true);
|
||||
g.drawString("Satellites: " + fix.satellites, x_start, y_start + 5*y_line, true);
|
||||
|
||||
} else if (gps_on) {
|
||||
|
||||
g.setFontAlign(0, 1);
|
||||
g.setFont("6x8", 2);
|
||||
g.drawString("GPS Watch", 120, 60);
|
||||
g.drawString("Waiting for GPS", 120, 80);
|
||||
nofix = (nofix+1) % 4;
|
||||
g.drawString(".".repeat(nofix) + " ".repeat(4-nofix), 120, 120);
|
||||
g.setFontAlign(0,0);
|
||||
g.drawString(fix.satellites + " satellites", 120, 100);
|
||||
|
||||
} else if (!gps_on) {
|
||||
|
||||
g.setFontAlign(0, 0);
|
||||
g.setFont("6x8", 3);
|
||||
g.drawString("GPS Watch", 120, 80);
|
||||
g.drawString("GPS is off",120, 160);
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
function onSecond(){
|
||||
var t = new Date();
|
||||
if ((t.getSeconds() % 5) === 0) draw();
|
||||
}
|
||||
|
||||
return {init:draw, tick:onSecond};
|
||||
}
|
||||
|
||||
return getFace;
|
||||
|
||||
})();
|
||||
|
|
@ -0,0 +1,202 @@
|
|||
(() => {
|
||||
|
||||
function getFace(){
|
||||
var nofix = 0;
|
||||
|
||||
function formatTime(now) {
|
||||
var fd = now.toUTCString().split(" ");
|
||||
return fd[4];
|
||||
}
|
||||
|
||||
function timeSince(t) {
|
||||
var hms = t.split(":");
|
||||
var now = new Date();
|
||||
|
||||
var sn = 3600*(now.getHours()) + 60*(now.getMinutes()) + 1*(now.getSeconds());
|
||||
var st = 3600*(hms[0]) + 60*(hms[1]) + 1*(hms[2]);
|
||||
|
||||
return (sn - st);
|
||||
}
|
||||
|
||||
|
||||
Number.prototype.toRad = function() { return this*Math.PI/180; };
|
||||
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
|
||||
/* Ordnance Survey Grid Reference functions (c) Chris Veness 2005-2014 */
|
||||
/* - www.movable-type.co.uk/scripts/gridref.js */
|
||||
/* - www.movable-type.co.uk/scripts/latlon-gridref.html */
|
||||
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
|
||||
function OsGridRef(easting, northing) {
|
||||
this.easting = 0|easting;
|
||||
this.northing = 0|northing;
|
||||
}
|
||||
OsGridRef.latLongToOsGrid = function(point) {
|
||||
var lat = point.lat.toRad();
|
||||
var lon = point.lon.toRad();
|
||||
|
||||
var a = 6377563.396, b = 6356256.909; // Airy 1830 major & minor semi-axes
|
||||
var F0 = 0.9996012717; // NatGrid scale factor on central meridian
|
||||
var lat0 = (49).toRad(), lon0 = (-2).toRad(); // NatGrid true origin is 49�N,2�W
|
||||
var N0 = -100000, E0 = 400000; // northing & easting of true origin, metres
|
||||
var e2 = 1 - (b*b)/(a*a); // eccentricity squared
|
||||
var n = (a-b)/(a+b), n2 = n*n, n3 = n*n*n;
|
||||
|
||||
var cosLat = Math.cos(lat), sinLat = Math.sin(lat);
|
||||
var nu = a*F0/Math.sqrt(1-e2*sinLat*sinLat); // transverse radius of curvature
|
||||
var rho = a*F0*(1-e2)/Math.pow(1-e2*sinLat*sinLat, 1.5); // meridional radius of curvature
|
||||
var eta2 = nu/rho-1;
|
||||
|
||||
var Ma = (1 + n + (5/4)*n2 + (5/4)*n3) * (lat-lat0);
|
||||
var Mb = (3*n + 3*n*n + (21/8)*n3) * Math.sin(lat-lat0) * Math.cos(lat+lat0);
|
||||
var Mc = ((15/8)*n2 + (15/8)*n3) * Math.sin(2*(lat-lat0)) * Math.cos(2*(lat+lat0));
|
||||
var Md = (35/24)*n3 * Math.sin(3*(lat-lat0)) * Math.cos(3*(lat+lat0));
|
||||
var M = b * F0 * (Ma - Mb + Mc - Md); // meridional arc
|
||||
|
||||
var cos3lat = cosLat*cosLat*cosLat;
|
||||
var cos5lat = cos3lat*cosLat*cosLat;
|
||||
var tan2lat = Math.tan(lat)*Math.tan(lat);
|
||||
var tan4lat = tan2lat*tan2lat;
|
||||
|
||||
var I = M + N0;
|
||||
var II = (nu/2)*sinLat*cosLat;
|
||||
var III = (nu/24)*sinLat*cos3lat*(5-tan2lat+9*eta2);
|
||||
var IIIA = (nu/720)*sinLat*cos5lat*(61-58*tan2lat+tan4lat);
|
||||
var IV = nu*cosLat;
|
||||
var V = (nu/6)*cos3lat*(nu/rho-tan2lat);
|
||||
var VI = (nu/120) * cos5lat * (5 - 18*tan2lat + tan4lat + 14*eta2 - 58*tan2lat*eta2);
|
||||
|
||||
var dLon = lon-lon0;
|
||||
var dLon2 = dLon*dLon, dLon3 = dLon2*dLon, dLon4 = dLon3*dLon, dLon5 = dLon4*dLon, dLon6 = dLon5*dLon;
|
||||
|
||||
var N = I + II*dLon2 + III*dLon4 + IIIA*dLon6;
|
||||
var E = E0 + IV*dLon + V*dLon3 + VI*dLon5;
|
||||
|
||||
return new OsGridRef(E, N);
|
||||
};
|
||||
|
||||
|
||||
/*
|
||||
* converts northing, easting to standard OS grid reference.
|
||||
*
|
||||
* [digits=10] - precision (10 digits = metres)
|
||||
* to_map_ref(8, 651409, 313177); => 'TG 5140 1317'
|
||||
* to_map_ref(0, 651409, 313177); => '651409,313177'
|
||||
*
|
||||
*/
|
||||
function to_map_ref(digits, easting, northing) {
|
||||
if (![ 0,2,4,6,8,10,12,14,16 ].includes(Number(digits))) throw new RangeError(`invalid precision '${digits}'`); // eslint-disable-line comma-spacing
|
||||
|
||||
let e = easting;
|
||||
let n = northing;
|
||||
|
||||
// use digits = 0 to return numeric format (in metres) - note northing may be >= 1e7
|
||||
if (digits == 0) {
|
||||
const format = { useGrouping: false, minimumIntegerDigits: 6, maximumFractionDigits: 3 };
|
||||
const ePad = e.toLocaleString('en', format);
|
||||
const nPad = n.toLocaleString('en', format);
|
||||
return `${ePad},${nPad}`;
|
||||
}
|
||||
|
||||
// get the 100km-grid indices
|
||||
const e100km = Math.floor(e / 100000), n100km = Math.floor(n / 100000);
|
||||
|
||||
// translate those into numeric equivalents of the grid letters
|
||||
let l1 = (19 - n100km) - (19 - n100km) % 5 + Math.floor((e100km + 10) / 5);
|
||||
let l2 = (19 - n100km) * 5 % 25 + e100km % 5;
|
||||
|
||||
// compensate for skipped 'I' and build grid letter-pairs
|
||||
if (l1 > 7) l1++;
|
||||
if (l2 > 7) l2++;
|
||||
const letterPair = String.fromCharCode(l1 + 'A'.charCodeAt(0), l2 + 'A'.charCodeAt(0));
|
||||
|
||||
// strip 100km-grid indices from easting & northing, and reduce precision
|
||||
e = Math.floor((e % 100000) / Math.pow(10, 5 - digits / 2));
|
||||
n = Math.floor((n % 100000) / Math.pow(10, 5 - digits / 2));
|
||||
|
||||
// pad eastings & northings with leading zeros
|
||||
e = e.toString().padStart(digits/2, '0');
|
||||
n = n.toString().padStart(digits/2, '0');
|
||||
|
||||
return `${letterPair} ${e} ${n}`;
|
||||
}
|
||||
|
||||
function draw() {
|
||||
var gps_on = false;
|
||||
|
||||
var fix = {
|
||||
fix: 0,
|
||||
alt: 0,
|
||||
lat: 0,
|
||||
lon: 0,
|
||||
speed: 0,
|
||||
time: 0,
|
||||
satellites: 0
|
||||
};
|
||||
|
||||
var y_line = 26;
|
||||
var y_start = 46;
|
||||
var x_start = 10;
|
||||
|
||||
// only attempt to get gps fix if gpsservuce is loaded
|
||||
if (WIDGETS.gpsservice !== undefined) {
|
||||
fix = WIDGETS.gpsservice.gps_get_fix();
|
||||
gps_on = WIDGETS.gpsservice.gps_get_status();
|
||||
}
|
||||
|
||||
g.reset();
|
||||
g.clearRect(0,24,239,239);
|
||||
|
||||
if (fix.fix) {
|
||||
var time = formatTime(fix.time);
|
||||
var age = timeSince(time);
|
||||
var os = OsGridRef.latLongToOsGrid(fix);
|
||||
var ref = to_map_ref(6, os.easting, os.northing);
|
||||
age = age >=0 ? age : 0; // avoid -1 etc
|
||||
|
||||
g.reset();
|
||||
g.clearRect(0,24,239,239);
|
||||
g.setFontAlign(0,0);
|
||||
g.setFont("Vector");
|
||||
g.setColor(1,1,1);
|
||||
g.setFontVector(40);
|
||||
g.drawString(time, 120, 80);
|
||||
|
||||
g.setFontVector(40);
|
||||
g.setColor(0xFFC0);
|
||||
g.drawString(ref, 120,140, true);
|
||||
|
||||
g.setFont("6x8",2);
|
||||
g.setColor(1,1,1);
|
||||
g.drawString(age, 120, 194);
|
||||
|
||||
} else if (gps_on) {
|
||||
|
||||
g.setFontAlign(0, 1);
|
||||
g.setFont("6x8", 2);
|
||||
g.drawString("Gridref Watch", 120, 60);
|
||||
g.drawString("Waiting for GPS", 120, 80);
|
||||
nofix = (nofix+1) % 4;
|
||||
g.drawString(".".repeat(nofix) + " ".repeat(4-nofix), 120, 120);
|
||||
g.setFontAlign(0,0);
|
||||
g.drawString(fix.satellites + " satellites", 120, 100);
|
||||
|
||||
} else if (!gps_on) {
|
||||
|
||||
g.setFontAlign(0, 0);
|
||||
g.setFont("6x8", 3);
|
||||
g.drawString("Gridref Watch", 120, 80);
|
||||
g.drawString("GPS is off", 120, 160);
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
function onSecond(){
|
||||
var t = new Date();
|
||||
if ((t.getSeconds() % 5) === 0) draw();
|
||||
}
|
||||
|
||||
return {init:draw, tick:onSecond};
|
||||
}
|
||||
|
||||
return getFace;
|
||||
|
||||
})();
|
||||
Loading…
Reference in New Issue