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fix: Correct ISS position projection on globe

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- Use actual ISS coordinates with globe rotation instead of fixed lon=0
- Fix orbit trail to use actual longitude offsets from ISS position
- Trail now properly follows behind ISS based on orbital path

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Smittix
2026-01-29 16:48:10 +00:00
parent 765e1384b5
commit 52997b3c78
1 changed files with 16 additions and 9 deletions
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25
static/js/modes/sstv.js
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@@ -498,28 +498,35 @@ const SSTV = (function() {
ctx.stroke();
}
// Draw ISS position - always at center since globe rotates to it
// Draw ISS position
if (issPosition) {
const issLat = issPosition.lat;
// ISS is at center horizontally
const point = projectPoint(issLat, 0, cx, cy, radius, 0);
const issLon = issPosition.lon;
// Project ISS using same rotation as continents
const point = projectPoint(issLat, issLon, cx, cy, radius, globeRotation);
if (point) {
const x = point.x;
const y = point.y;
// ISS orbit trail (behind it)
// ISS orbit trail (where it's been)
// ISS orbit is inclined at 51.6 degrees
ctx.strokeStyle = 'rgba(0, 212, 255, 0.3)';
ctx.lineWidth = 2;
ctx.setLineDash([4, 4]);
ctx.beginPath();
for (let trailLon = -60; trailLon <= 0; trailLon += 3) {
// Approximate orbit inclination of 51.6 degrees
const trailLat = issLat + Math.sin(trailLon * Math.PI / 180) * 10;
const trailPoint = projectPoint(trailLat, trailLon, cx, cy, radius, 0);
let trailStarted = false;
for (let offset = -60; offset <= 0; offset += 3) {
// Calculate trail position accounting for orbital inclination
const trailLon = issLon + offset;
// Approximate latitude change based on orbit inclination (51.6°)
const orbitPhase = (offset / 360) * 2 * Math.PI;
const trailLat = issLat - Math.sin(orbitPhase) * 20;
const trailPoint = projectPoint(trailLat, trailLon, cx, cy, radius, globeRotation);
if (trailPoint) {
if (trailLon === -60) {
if (!trailStarted) {
ctx.moveTo(trailPoint.x, trailPoint.y);
trailStarted = true;
} else {
ctx.lineTo(trailPoint.x, trailPoint.y);
}