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Positions demo: save geographic coordinates.

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Don Cross
2019-05-15 21:10:27 -04:00
parent b80bb78db5
commit dc0bb07fbb
1 changed files with 73 additions and 24 deletions
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97
demo/browser/positions.html
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@@ -17,20 +17,20 @@
</tr>
<tr>
<td>Latitude:</td>
<td><input type="text" id="EditLatitude" value="29.0" pattern="[\-\+]?\d+(\.\d*)?"></td>
<td><input type="text" id="EditLatitude" pattern="[\-\+]?\d+(\.\d*)?"></td>
</tr>
<tr>
<td>Longitude:</td>
<td><input type="text" id="EditLongitude" value="-81.0" pattern="[\-\+]?\d+(\.\d*)?"></td>
<td><input type="text" id="EditLongitude" pattern="[\-\+]?\d+(\.\d*)?"></td>
</tr>
<tr>
<td>Elevation (m):</td>
<td><input type="text" id="EditElevation" value="0" pattern="[\-\+]?\d+(\.\d*)?"></td>
<td><input type="text" id="EditElevation" pattern="[\-\+]?\d+(\.\d*)?"></td>
</tr>
</table>
<h2>Calculations</h2>
<table cellpadding="5" cellspacing="0">
<table cellpadding="5" cellspacing="0" id="CalcTable">
<tr>
<td>body</td>
<td class="NumHeader">RA</td>
@@ -124,6 +124,42 @@
<script src="../../source/js/astronomy.js"></script>
<script>
window.onload = function() {
const StorageKey = 'AstroDemo.Positions.Options';
var Options;
function IsValidNumber(s) {
return typeof s === 'string' && /^[\-\+]?\d+(\.\d*)?$/.test(s);
}
function LoadOptions() {
let options;
try {
options = JSON.parse(window.localStorage.getItem(StorageKey));
} catch (e) {
}
if (!options) options = {};
if (!IsValidNumber(options.latitude)) options.latitude = '30';
if (!IsValidNumber(options.longitude)) options.longitude = '-90';
if (!IsValidNumber(options.elevation)) options.elevation = '0';
return options;
}
function SaveOptions() {
try {
window.localStorage.setItem(StorageKey, JSON.stringify(Options));
} catch (e) {
}
}
function Init() {
let options = LoadOptions();
document.getElementById('EditLatitude').value = options.latitude;
document.getElementById('EditLongitude').value = options.longitude;
document.getElementById('EditElevation').value = options.elevation;
return options;
}
function Pad(s, w) {
s = s.toFixed(0);
while (s.length < w) {
@@ -143,36 +179,49 @@
}
function FormatCoord(x) {
let s = x.toFixed(2);
while (s.length < 6) {
s = ' ' + s;
}
return s;
return x.toFixed(2);
}
function UpdateScreen() {
let date = new Date();
document.getElementById('DateTimeBox').innerText = FormatDate(date);
let latitude = parseFloat(document.getElementById('EditLatitude').value);
let longitude = parseFloat(document.getElementById('EditLongitude').value);
let elevation = parseFloat(document.getElementById('EditElevation').value);
let observer = Astronomy.MakeObserver(latitude, longitude, elevation);
let text_latitude = document.getElementById('EditLatitude').value;
let text_longitude = document.getElementById('EditLongitude').value;
let text_elevation = document.getElementById('EditElevation').value;
if (!IsValidNumber(text_latitude) || !IsValidNumber(text_longitude) || !IsValidNumber(text_elevation)) {
// Bail out until user corrects problems in the observer coordinates.
// Gray out the whole table so the user knows there is something wrong.
document.getElementById('CalcTable').style.display = 'none';
} else {
let date = new Date();
document.getElementById('DateTimeBox').innerText = FormatDate(date);
document.getElementById('CalcTable').style.display = '';
for (let body of Astronomy.Bodies) {
if (body !== 'Earth') {
let gv = Astronomy.GeoVector(body, date);
let sky = Astronomy.SkyPos(gv, observer);
let hor = Astronomy.Horizon(date, observer, sky.ofdate.ra, sky.ofdate.dec);
document.getElementById(`${body}_ra`).innerText = FormatCoord(sky.j2000.ra);
document.getElementById(`${body}_dec`).innerText = FormatCoord(sky.j2000.dec);
document.getElementById(`${body}_az`).innerText = FormatCoord(hor.azimuth);
document.getElementById(`${body}_alt`).innerText = FormatCoord(hor.altitude);
let latitude = parseFloat(text_latitude);
let longitude = parseFloat(text_longitude);
let elevation = parseFloat(text_elevation);
if (latitude !== Options.latitude || longitude !== Options.longitude || elevation !== Options.elevation) {
Options = { latitude:text_latitude, longitude:text_longitude, elevation:text_elevation };
SaveOptions();
}
let observer = Astronomy.MakeObserver(latitude, longitude, elevation);
for (let body of Astronomy.Bodies) {
if (body !== 'Earth') {
let gv = Astronomy.GeoVector(body, date);
let sky = Astronomy.SkyPos(gv, observer);
let hor = Astronomy.Horizon(date, observer, sky.ofdate.ra, sky.ofdate.dec);
document.getElementById(`${body}_ra`).innerText = FormatCoord(sky.j2000.ra);
document.getElementById(`${body}_dec`).innerText = FormatCoord(sky.j2000.dec);
document.getElementById(`${body}_az`).innerText = FormatCoord(hor.azimuth);
document.getElementById(`${body}_alt`).innerText = FormatCoord(hor.altitude);
}
}
}
setTimeout(UpdateScreen, 1000);
}
Options = Init();
UpdateScreen();
}
</script>