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<!DOCTYPE html>
<!--
This program records a device's location with human-readable lines
Normally the file should be hosted in https://vps.hcc.io/l.html
Copyright (C) 2020-2022 Eric Li 李宵逸
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
-->
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width; initial-scale=1.0;
maximum-scale=1.0; user-scalable=no">
<title>LocationTrackerWeb</title>
<style>
* {
box-sizing: border-box;
}
html, body {
height: 100%;
}
body {
margin: 0px;
padding: 8px;
overflow: hidden; /* disable scroll */
}
body.flex {
display: flex;
flex-direction: column;
}
div.page {
flex-grow: 1;
display: flex;
flex-direction: column;
}
.row {
display: flex;
flex-direction: row;
}
.col-2 {
flex-grow: 1;
float: left;
overflow: hidden;
}
.col-4 {
flex-grow: 2;
float: left;
overflow: hidden;
}
textarea {
width: 100%;
flex-grow: 1;
white-space: pre;
overflow-wrap: normal;
overflow-x: scroll;
}
.big {
font-size: 1.5em;
}
.gray {
color: gray;
}
span.border {
border: 1px solid gray;
/* white-space: nowrap; */
}
</style>
</head>
<body class="flex">
<div id="upper_btns" class="row">
<button class="col-2" onclick="watchLocation();">追踪</button>
<button class="col-2" onclick="unwatchLocation();">停止</button>
<button class="col-2" onclick="toggleConfig();">设置</button>
<button class="col-2" onclick="answer_scroll();">滚动</button>
<button class="col-4" onclick="swap_info();">交换</button>
</div>
<div id="main_page" class="page">
<div id="info_table">
<div class="row big">
<div class="col-4">
<div class="row"><span class="col-4 border" id="lo">经度</span></div>
<div class="row"><span class="col-4 border" id="la">纬度</span></div>
</div>
<div class="col-2">
<div class="row">
<span class="col-2 border"><span id="al">高度米</span> m</span>
</div>
<div class="row">
<span class="col-2 border"><span id="ft">高度英尺</span> ft</span>
</div>
</div>
</div>
<div class="row">
<span class="col-4 border big"><span id="he">朝向</span> deg</span>
<span class="col-2 border gray"><span id="ac">精确度</span> m</span>
<span class="col-4 border big"><span id="sp">速度</span> m/s</span>
<span class="col-2 border gray"><span id="aa">高度精确度</span> m</span>
</div>
<div class="row big">
<span class="col-4 border"><span id="kts">速度节</span> kts</span>
<span class="col-4 border"><span id="mph">速度迈</span> mph</span>
<span class="col-4 border"><span id="kmh">速度千米时</span> km/h</span>
</div>
</div>
<textarea id="answer2" autocomplete="off"></textarea>
<textarea id="answer" autocomplete="off"></textarea>
</div>
<div id="config_page" class="page" style="display: none;">
<div class="row">
<div class="col-4">
<input id="accurate_chk" type="checkbox" name="accurate" value="high"
autocomplete="off" onclick="accurate_clicked(event);">
<label for="accurate" onclick="accurate_clicked(event);">非精确</label>
</div>
<div class="col-4">
<input id="line_lim_chk" type="checkbox" name="line_lim"
autocomplete="off" onclick="line_lim_clicked(event);">
<label for="line_lim" onclick="line_lim_clicked(event);">
不限制文本为10行
</label>
</div>
<div class="col-4">
<input id="local_save_chk" type="checkbox" name="local_save"
autocomplete="off" onclick="local_save_clicked();">
<label for="local_save" onclick="local_save_clicked();">
禁用本地储存
</label>
</div>
</div>
<div class="row">
<button class="col-4" onclick="show_storage();">显示本地储存</button>
<button class="col-2" onclick="show_storage_range();">分段显示本地储存</button>
<button class="col-2" onclick="clear_storage();">清除本地储存</button>
<button class="col-4" onclick="clear_storage_text();">清除文本</button>
</div>
<textarea id="answer3" autocomplete="off"></textarea>
</div>
<div id="lower_btns" class="row"></div>
<script type="text/javascript">
// Initialize
lower_btns.innerHTML = upper_btns.innerHTML;
// Definitions
const LABELS = ['la', 'lo', 'al', 'ac', 'aa', 'he', 'sp'];
const EXTRACT_DATA = (x) => [
x.latitude, x.longitude, x.altitude, x.accuracy, x.altitudeAccuracy,
x.heading, x.speed];
const DISPLAY_ACCURACY = [0, 0, 1000, 1000, 1000, 1000, 10];
// Helper functions
function gebi(id) {
return document.getElementById(id)
}
function unit_convert(value, multiplier) {
// Convert value (e.g. speed in m/s) to a different unit (e.g. mph, kts)
if (value === null) {
return "null";
} else {
return Math.round(value * multiplier * 10) / 10;
}
}
function format_degree(raw_data) {
// 123.101 -> "123°06'03''.599" (similar to "%02d°%02d'%02d''%.3f")
let sgn = raw_data < 0 ? '-' : '';
let rem = raw_data < 0 ? -raw_data : raw_data;
let deg = Math.trunc(rem);
rem = (rem - deg) * 60.0;
let min = Math.trunc(rem);
rem = (rem - min) * 60.0;
let sec = Math.trunc(rem);
rem = (rem - sec) * 1000.0;
let point = Math.trunc(rem);
return (sgn + deg + '°' + min.toString().padStart(2, '0')
+ "'" + sec.toString().padStart(2, '0')
+ "''." + point.toString().padStart(3, '0'))
}
function data2str(time, data) {
// Convert data to string (for the user to copy)
let ans = 't:' + time;
for (let i = 0; i < LABELS.length; i += 1) {
let str = 'null';
let display_str = 'null';
const label = LABELS[i];
const value = data[i];
if (!isNaN(value) && value != null) {
str = value.toString();
}
ans += ',' + label + ':' + str;
}
ans += '\n';
return ans;
}
function display_data(data) {
// Display a data
for (let i = 0; i < LABELS.length; i += 1) {
let display_str = 'null';
const label = LABELS[i];
const value = data[i];
const round = DISPLAY_ACCURACY[i];
if (!isNaN(value) && value != null) {
if (round != 0) {
display_str = Math.round(value * round) / round;
} else {
display_str = value.toString();
}
}
gebi(label).innerText = display_str;
}
gebi('la').innerText = format_degree(data[0]);
gebi('lo').innerText = format_degree(data[1]);
gebi('ft').innerText = unit_convert(data[2], 3.2808399);
gebi('kts').innerText = unit_convert(data[6], 1.94384449);
gebi('mph').innerText = unit_convert(data[6], 2.23693629);
gebi('kmh').innerText = unit_convert(data[6], 3.6);
}
function data2bytes(data) {
// Convert data (a list of doubles) to bytes
const f64arr = new Float64Array(data);
const i16arr = new Int16Array(f64arr.buffer);
let isnan = 0;
for (let i = 0; i < data.length; i++) {
isnan <<= 1;
if (isNaN(data[i]) || data[i] == null) {
isnan |= 1;
}
}
bytes = String.fromCharCode(isnan);
for (let i = 0; i < i16arr.length; i++) {
bytes += String.fromCharCode(i16arr[i]);
}
return bytes;
}
function bytes2data(bytes) {
// Convert bytes to data (a list of doubles)
let isnan = bytes.charCodeAt(0);
let i16 = [];
for (let i = 1; i < bytes.length; i++) {
i16[i16.length] = bytes.charCodeAt(i);
}
const i16arr = new Int16Array(i16);
const f64arr = new Float64Array(i16arr.buffer);
let data = Array.from(f64arr);
for (let i = data.length - 1; i >= 0; i--) {
if (isnan & 1) {
data[i] = NaN;
}
isnan >>= 1;
}
return data;
}
// Handle UI change functions
let accurate = true;
function accurate_clicked(event) {
gebi("accurate_chk").checked = accurate;
accurate = !accurate;
}
let line_lim = true;
function line_lim_clicked() {
gebi("line_lim_chk").checked = line_lim;
line_lim = !line_lim;
}
let local_save = true;
function local_save_clicked() {
gebi("local_save_chk").checked = local_save;
local_save = !local_save;
}
function toggleConfig() {
const config = gebi('config_page').style['display'] == 'none';
const cv = config ? '' : 'none';
const mv = config ? 'none' : '';
gebi('config_page').style.setProperty('display', cv);
gebi('main_page').style.setProperty('display', mv);
}
function answer_scroll() {
if (answer2.scrollTop != 0) {
answer2.scrollTop = 0;
} else {
answer2.scrollTop = answer2.scrollHeight;
}
if (answer3.scrollTop != 0) {
answer3.scrollTop = 0;
} else {
answer3.scrollTop = answer3.scrollHeight;
}
}
function swap_info() {
answer2.value += answer.value;
answer.value = '';
}
function clear_storage_text() {
answer3.value = '';
}
// Handle local storage
const LOCAL_KEY_PREFIX = 'LocationTracker:';
const LOCAL_KEY_LEN = LOCAL_KEY_PREFIX.length;
function store_local_data(t, s, i) {
if (!local_save)
return;
try {
window.localStorage.setItem(LOCAL_KEY_PREFIX + t + '|' + i, s);
} catch (error) {
answer3.value += 'Error storing to local storage at ' + t + '\n';
}
}
function collect_storage() {
// Collect relevant data in local storage
let values = [];
for (let i = 0; i < window.localStorage.length; i++) {
const key = window.localStorage.key(i);
if (key.startsWith(LOCAL_KEY_PREFIX)) {
const [time, index] = key.substr(LOCAL_KEY_LEN).split('|');
const data = bytes2data(window.localStorage.getItem(key));
values[values.length] = [
parseInt(time), parseInt(index), data2str(time, data)];
}
}
function cmp(first, second) {
if (first[0] < second[0]) return -1;
else if (first[0] > second[0]) return 1;
else if (first[1] < second[1]) return -1;
else if (first[1] > second[1]) return 1;
else return 0;
}
values.sort(cmp);
return values;
}
function show_storage() {
const values = collect_storage();
answer3.value += (
'# Begin of local storage (' + values.length + ' lines)\n');
for (let i = 0; i < values.length; i++) {
answer3.value += values[i][2];
}
answer3.value += (
'# End of local storage (' + values.length + ' lines)\n');
}
function show_storage_range() {
const command = answer3.value.trim();
matched = command.match(/^(\d+)-(\d+)$/)
if (matched != null) {
const begin = parseInt(matched[1]);
const end = parseInt(matched[2]);
const values = collect_storage();
answer3.value = '# #lines before slice: ' + values.length + '\n';
answer3.value += (
'# Begin of local storage (start at line ' + begin + ')\n');
for (let i = 0; i < values.length; i++) {
if (begin <= i && i < end) {
answer3.value += values[i][2];
}
}
answer3.value += (
'# End of local storage (end at line ' + end + ')\n');
} else if (command == 'len') {
answer3.value = 'Length: ' + collect_storage().length + '\n';
} else {
answer3.value = 'Enter command in this input box:\n';
answer3.value += ' len:\tshow total number of lines (current '
answer3.value += 'implementation is inefficient)\n';
answer3.value += ' 0-100:\tshow first 100 lines\n';
answer3.value += ' 100-200:\tshow second 100 lines\n';
answer3.value += ' ...\n';
}
}
function clear_storage() {
if (confirm('Are you sure to clear local storage?')) {
// window.localStorage.clear();
let keys = [];
for (let i = 0; i < window.localStorage.length; i++) {
const key = window.localStorage.key(i);
if (key.startsWith('LocationTracker:')) {
keys[keys.length] = key;
}
}
for (let i = 0; i < keys.length; i++) {
window.localStorage.removeItem(keys[i]);
}
answer3.value += '# Done (removed ' + keys.length + ' lines)\n';
}
}
// Fetch and display location data
let watchLocation_id = undefined;
let record_index = 0;
function showPosition(position) {
const coords = position.coords;
const time = Date.now().toString();
const data = EXTRACT_DATA(coords);
const str = data2str(time, data);
display_data(data);
answer.value += str;
// Save data to localStorage
store_local_data(time, data2bytes(data), record_index);
record_index++;
// Limit text length
if (line_lim) {
const arr = answer.value.split("\n")
answer.value = arr.slice(Math.max(arr.length - 10, 0)).join("\n");
}
}
function exit_refrain() {
window.onbeforeunload = function () {
return "Are you sure to close the window?";
};
}
function getPositionOptions() {
// https://developer.mozilla.org/zh-CN/docs/Web/API/PositionOptions
return { enableHighAccuracy: accurate };
}
function watchLocation() {
exit_refrain();
if (watchLocation_id !== undefined) {
alert('即将取消上一次追踪，并重新请求追踪');
navigator.geolocation.clearWatch(watchLocation_id);
watchLocation_id = undefined;
}
if (navigator.geolocation) {
watchLocation_id = (
navigator.geolocation.watchPosition(showPosition, showError,
getPositionOptions()));
}
}
function unwatchLocation() {
if (watchLocation_id !== undefined) {
navigator.geolocation.clearWatch(watchLocation_id);
watchLocation_id = undefined;
alert('已取消上一次追踪');
}
}
function showError(error) {
var error_type = 'UNDEFINED';
switch(error.code) {
case error.PERMISSION_DENIED:
error_type = 'PERMISSION_DENIED';
case error.POSITION_UNAVAILABLE:
error_type = 'POSITION_UNAVAILABLE';
case error.TIMEOUT:
error_type = 'TIMEOUT';
case error.UNKNOWN_ERROR:
error_type = 'UNKNOWN_ERROR';
}
answer.value += '## watchPosition(): ' + error_type + '\n';
}
</script>
</body>