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2025-02-26 11:27:10 +01:00
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Senthara Orbit, Rotation & Day/Night Visualization</title>
<script src="https://cdn.jsdelivr.net/npm/phaser@3.60.0/dist/phaser.js"></script>
<style>
body { margin: 0; overflow: hidden; }
canvas { display: block; }
/* Style for the control panel */
#controlPanel {
position: absolute;
bottom: 10px;
right: 10px;
background-color: rgba(0, 0, 0, 0.7);
padding: 10px;
border-radius: 5px;
font-family: Arial, sans-serif;
color: white;
}
#controlPanel button, #controlPanel select {
margin: 5px;
padding: 8px;
border-radius: 4px;
border: 1px solid #ccc;
background-color: #eee;
color: black;
cursor: pointer;
}
#controlPanel button:hover {
background-color: #ddd;
}
#controlPanel select:hover {
background-color: #ddd;
}
</style>
<meta charset="UTF-8">
<title>Senthara Orbit, Rotation, Day/Night & Elliptical Orbits</title>
<script src="https://cdn.jsdelivr.net/npm/phaser@3.60.0/dist/phaser.js"></script>
<style>
body { margin: 0; overflow: hidden; }
canvas { display: block; }
/* Style for the control panel */
#controlPanel {
position: absolute;
bottom: 10px;
right: 10px;
background-color: rgba(0, 0, 0, 0.7);
padding: 10px;
border-radius: 5px;
font-family: Arial, sans-serif;
color: white;
}
#controlPanel button, #controlPanel select {
margin: 5px;
padding: 8px;
border-radius: 4px;
border: 1px solid #ccc;
background-color: #eee;
color: black;
cursor: pointer;
}
#controlPanel button:hover, #controlPanel select:hover {
background-color: #ddd;
}
</style>
</head>
<body>
<div id="controlPanel">
<button id="playPauseButton">Play</button>
<button id="rewindButton">Rewind</button>
<select id="speedSelect">
<option value="1">x1</option>
<option value="2">x2</option>
<option value="5" selected>x5</option>
<option value="10">x10</option>
<option value="100">x100</option>
<option value="1000">x1000</option>
<option value="1000">x1000</option>
<option value="10000">x10000</option>
<option value="100000">x100000</option>
<option value="1000000">x1000000</option>
</select>
</div>
<div id="controlPanel">
<button id="playPauseButton">Play</button>
<button id="rewindButton">Rewind</button>
<select id="speedSelect">
<option value="1">x1</option>
<option value="2">x2</option>
<option value="5" selected>x5</option>
<option value="10">x10</option>
<option value="100">x100</option>
<option value="1000">x1000</option>
<option value="10000">x10000</option>
<option value="100000">x100000</option>
<option value="1000000">x1000000</option>
</select>
</div>
<script>
// Helper: returns {x, y} for an elliptical orbit.
// a = semi-major axis, ecc = eccentricity, so semi-minor axis b = a*sqrt(1 - ecc^2).
// theta is a linear parameter based on simulation time (not the true anomaly, but sufficient for visualization).
function getEllipticalPosition(simTime, period, a, ecc) {
const theta = Phaser.Math.DegToRad((360 * (simTime % period)) / period - 90);
const b = a * Math.sqrt(1 - ecc * ecc);
return { x: a * Math.cos(theta), y: b * Math.sin(theta) };
}
<script>
// Function to calculate the current Senthara date from simulationTime (in days)
function getSentharaDate(simDays) {
const offset = 134;
const X = Math.floor(simDays + offset);
const year = Math.floor(X / 396) + 1;
const dayOfYear = (X % 396) + 1;
const seasonIndex = Math.floor((dayOfYear - 1) / 99);
const dayOfSeason = dayOfYear - seasonIndex * 99;
const seasons = ["Summer", "Autumn", "Winter", "Spring"];
return `Year ${year} - ${seasons[seasonIndex]} ${dayOfSeason}`;
}
// Function to calculate the current Senthara date from simulationTime (in days),
// with an offset so that simulationTime=0 corresponds to "Autumn 36".
function getSentharaDate(simDays) {
const offset = 134;
const X = Math.floor(simDays + offset);
const year = Math.floor(X / 396) + 1;
const dayOfYear = (X % 396) + 1;
const seasonIndex = Math.floor((dayOfYear - 1) / 99);
const dayOfSeason = dayOfYear - seasonIndex * 99;
const seasons = ["Summer", "Autumn", "Winter", "Spring"];
return `Year ${year} - ${seasons[seasonIndex]} ${dayOfSeason}`;
}
// Phaser configuration
const config = {
type: Phaser.AUTO,
width: window.innerWidth,
height: window.innerHeight,
backgroundColor: "#000000",
scene: {
preload: preload,
create: create,
update: update
},
scale: {
mode: Phaser.Scale.RESIZE
}
};
// Phaser configuration (responsive)
const config = {
type: Phaser.AUTO,
width: window.innerWidth,
height: window.innerHeight,
backgroundColor: "#000000",
scene: {
preload: preload,
create: create,
update: update
},
scale: {
mode: Phaser.Scale.RESIZE
}
};
const game = new Phaser.Game(config);
const game = new Phaser.Game(config);
let globalGraphics;
let dateText;
let simulationTime = 0;
let simulationSpeed = 5;
let isPlaying = false;
let isRewinding = false;
let globalGraphics;
let dateText;
let simulationTime = 0; // in days (simulation time)
let simulationSpeed = 5; // speed multiplier
let isPlaying = false; // Start paused
let isRewinding = false; // Control forward/backward
// Orbital parameters (in days and relative units)
const planetPeriod = 396;
const planetRotationPeriod = 1;
const kerielPeriod = 27;
const arkaenPeriod = 82;
const minianPeriod = 98;
// Orbital periods (in days)
const planetPeriod = 396; // Senthara's orbital year around its star
const planetRotationPeriod = 1; // Planet rotates fully in 1 day
const kerielPeriod = 27;
const arkaenPeriod = 82;
const minianPeriod = 98;
// Orbital radii and eccentricities
let planetOrbitRadius, kerielOrbitRadius, arkaenOrbitRadius, minianOrbitRadius;
const planetEccentricity = 0.2; // Example eccentricity for Senthara
const kerielEccentricity = 0.1;
const arkaenEccentricity = 0.15;
const minianEccentricity = 0.05;
// Eccentricity parameters (0 = circle; higher values = more elliptical)
const planetEcc = 0.2; // Planet's orbit eccentricity
const kerielEcc = 0.05; // Moons tend to have near-circular orbits due to tidal locking
const arkaenEcc = 0.05;
const minianEcc = 0.05;
// Angle offsets
let planetAngleOffset;
let kerielAngleOffset;
let arkaenAngleOffset;
let minianAngleOffset;
// Orbital radii (semi-major axes) (computed relative to window size)
let planetOrbitRadius, kerielOrbitRadius, arkaenOrbitRadius, minianOrbitRadius;
// Containers
let planetContainer;
let kerielContainer, arkaenContainer, minianContainer;
// Containers for the planet and the moons.
let planetContainer;
let kerielContainer, arkaenContainer, minianContainer;
function preload() {
// No external assets are needed.
}
function create() {
globalGraphics = this.add.graphics();
dateText = this.add.text(10, game.scale.height - 30, "", { font: "20px Arial", fill: "#ffffff" });
function preload() {
// No external assets are needed.
}
recalcOrbitRadii();
setRandomAngleOffsets();
function create() {
globalGraphics = this.add.graphics();
planetContainer = this.add.container(0, 0);
let planetBody = this.add.graphics();
planetBody.fillStyle(0x00FF00, 1);
planetBody.fillCircle(0, 0, 12);
planetBody.lineStyle(2, 0x000000, 1);
planetBody.beginPath();
planetBody.moveTo(0, 0);
planetBody.lineTo(12, 0);
planetBody.strokePath();
planetContainer.add(planetBody);
dateText = this.add.text(10, game.scale.height - 30, "", {
font: "20px Arial",
fill: "#ffffff"
});
let nightOverlay = this.add.graphics();
nightOverlay.fillStyle(0x000000, 0.5);
nightOverlay.slice(0, 0, 12, 0, Math.PI, false);
nightOverlay.fillPath();
planetContainer.nightOverlay = nightOverlay;
planetContainer.add(nightOverlay);
recalcOrbitRadii();
kerielContainer = createMoonContainer(this, 6, 0xFF0000);
arkaenContainer = createMoonContainer(this, 5, 0x0000FF);
minianContainer = createMoonContainer(this, 5, 0xFFFFFF);
// Create container for Senthara (the planet)
planetContainer = this.add.container(0, 0);
// Planet body (green circle) with a marker line.
let planetBody = this.add.graphics();
planetBody.fillStyle(0x00FF00, 1);
planetBody.fillCircle(0, 0, 12);
planetBody.lineStyle(2, 0x000000, 1);
planetBody.beginPath();
planetBody.moveTo(0, 0);
planetBody.lineTo(12, 0);
planetBody.strokePath();
planetContainer.add(planetBody);
this.scale.on('resize', (gameSize) => {
recalcOrbitRadii();
dateText.setPosition(10, gameSize.height - 30);
});
// Night overlay for day/night cycle (semi-transparent half-circle)
let nightOverlay = this.add.graphics();
nightOverlay.fillStyle(0x000000, 0.5);
nightOverlay.slice(0, 0, 12, 0, Math.PI, false);
nightOverlay.fillPath();
planetContainer.nightOverlay = nightOverlay;
planetContainer.add(nightOverlay);
const playPauseButton = document.getElementById("playPauseButton");
const rewindButton = document.getElementById("rewindButton");
const speedSelect = document.getElementById("speedSelect");
// Create containers for each moon.
kerielContainer = createMoonContainer(this, 6, 0xFF0000); // Keriel: red
arkaenContainer = createMoonContainer(this, 5, 0x0000FF); // Arkaen: blue
minianContainer = createMoonContainer(this, 5, 0xFFFFFF); // Minian: white
playPauseButton.addEventListener("click", () => {
isPlaying = !isPlaying;
playPauseButton.textContent = isPlaying ? "Pause" : "Play";
if (isPlaying) isRewinding = false;
});
// UI Control Handlers
const playPauseButton = document.getElementById("playPauseButton");
const rewindButton = document.getElementById("rewindButton");
const speedSelect = document.getElementById("speedSelect");
rewindButton.addEventListener("click", () => {
isRewinding = !isRewinding;
rewindButton.textContent = isRewinding ? "Forward" : "Rewind";
if (isRewinding) isPlaying = false;
playPauseButton.textContent = "Play";
});
playPauseButton.addEventListener("click", () => {
isPlaying = !isPlaying;
playPauseButton.textContent = isPlaying ? "Pause" : "Play";
if (isPlaying) isRewinding = false;
});
speedSelect.addEventListener("change", () => {
simulationSpeed = parseFloat(speedSelect.value);
});
}
function createMoonContainer(scene, radius, color) {
let moonContainer = scene.add.container(0, 0);
let moonBody = scene.add.graphics();
moonBody.fillStyle(color, 1);
moonBody.fillCircle(0, 0, radius);
moonBody.lineStyle(2, 0x000000, 1);
moonBody.beginPath();
moonBody.moveTo(0, 0);
moonBody.lineTo(radius, 0);
moonBody.strokePath();
moonContainer.add(moonBody);
return moonContainer;
}
rewindButton.addEventListener("click", () => {
isRewinding = !isRewinding;
rewindButton.textContent = isRewinding ? "Forward" : "Rewind";
if(isRewinding) isPlaying = false;
playPauseButton.textContent = "Play";
});
// Recalculate orbital radii based on the current window size.
function recalcOrbitRadii() {
const minDim = Math.min(window.innerWidth, window.innerHeight);
planetOrbitRadius = minDim * 0.3;
kerielOrbitRadius = planetOrbitRadius * 0.25;
arkaenOrbitRadius = planetOrbitRadius * 0.35;
minianOrbitRadius = planetOrbitRadius * 0.45;
}
// Sets random angle offsets.
function setRandomAngleOffsets() {
planetAngleOffset = Phaser.Math.RND.between(0, 360);
kerielAngleOffset = Phaser.Math.RND.between(0, 360);
arkaenAngleOffset = Phaser.Math.RND.between(0, 360);
minianAngleOffset = Phaser.Math.RND.between(0, 360);
}
speedSelect.addEventListener("change", () => {
simulationSpeed = parseFloat(speedSelect.value);
});
// Calculates position on an ellipse.
function calculateEllipsePosition(centerX, centerY, semiMajorAxis, eccentricity, period, time, angleOffset) {
const meanAnomaly = (2 * Math.PI * (time % period)) / period;
// Approximate eccentric anomaly using Newton-Raphson method
let eccentricAnomaly = approximateEccentricAnomaly(meanAnomaly, eccentricity);
this.scale.on('resize', (gameSize) => {
recalcOrbitRadii();
dateText.setPosition(10, gameSize.height - 30);
});
}
// Calculate the true anomaly
const trueAnomaly = 2 * Math.atan2(
Math.sqrt(1 + eccentricity) * Math.sin(eccentricAnomaly / 2),
Math.sqrt(1 - eccentricity) * Math.cos(eccentricAnomaly / 2)
);
// Helper function to create a moon container with a circular body and a marker.
function createMoonContainer(scene, radius, color) {
let moonContainer = scene.add.container(0, 0);
let moonBody = scene.add.graphics();
moonBody.fillStyle(color, 1);
moonBody.fillCircle(0, 0, radius);
moonBody.lineStyle(2, 0x000000, 1);
moonBody.beginPath();
moonBody.moveTo(0, 0);
moonBody.lineTo(radius, 0);
moonBody.strokePath();
moonContainer.add(moonBody);
return moonContainer;
}
// Calculate distance from the center
const distance = semiMajorAxis * (1 - eccentricity * Math.cos(eccentricAnomaly));
// Recalculate orbital radii based on window size.
function recalcOrbitRadii() {
const minDim = Math.min(window.innerWidth, window.innerHeight);
planetOrbitRadius = minDim * 0.3; // semi-major axis for planet orbit
kerielOrbitRadius = planetOrbitRadius * 0.25;
arkaenOrbitRadius = planetOrbitRadius * 0.35;
minianOrbitRadius = planetOrbitRadius * 0.45;
}
// Calculate x and y coordinates, with angle offset
const x = centerX + distance * Math.cos(trueAnomaly + Phaser.Math.DegToRad(angleOffset));
const y = centerY + distance * Math.sin(trueAnomaly + Phaser.Math.DegToRad(angleOffset));
function update(time, delta) {
// Advance or rewind simulation time.
if (isPlaying) {
simulationTime += (delta * simulationSpeed) / 1000;
} else if (isRewinding) {
simulationTime -= (delta * simulationSpeed) / 1000;
}
return { x, y };
}
// Approximates the eccentric anomaly using the Newton-Raphson method.
function approximateEccentricAnomaly(meanAnomaly, eccentricity) {
let E = meanAnomaly; // Initial guess
let delta = 1;
const centerX = game.scale.width / 2;
const centerY = game.scale.height / 2;
// Iterate until the change is small enough (e.g., less than 0.0001)
while (delta > 0.0001) {
let nextE = E - (E - eccentricity * Math.sin(E) - meanAnomaly) / (1 - eccentricity * Math.cos(E));
delta = Math.abs(nextE - E);
E = nextE;
}
return E;
}
globalGraphics.clear();
function update(time, delta) {
if (isPlaying) {
simulationTime += (delta * simulationSpeed) / 1000;
} else if (isRewinding) {
simulationTime -= (delta * simulationSpeed) / 1000;
}
// Draw the central star.
globalGraphics.fillStyle(0xFFFF00, 1);
globalGraphics.fillCircle(centerX, centerY, 20);
const centerX = game.scale.width / 2;
const centerY = game.scale.height / 2;
// Draw the planet's elliptical orbital path around the star.
const bPlanet = planetOrbitRadius * Math.sqrt(1 - planetEcc * planetEcc);
globalGraphics.lineStyle(1, 0x555555, 1);
globalGraphics.strokeEllipse(centerX, centerY, 2 * planetOrbitRadius, 2 * bPlanet);
globalGraphics.clear();
globalGraphics.fillStyle(0xFFFF00, 1);
globalGraphics.fillCircle(centerX, centerY, 20);
// Get planet's position on its elliptical orbit.
const planetPos = getEllipticalPosition(simulationTime, planetPeriod, planetOrbitRadius, planetEcc);
const planetX = centerX + planetPos.x;
const planetY = centerY + planetPos.y;
// Calculate and draw Senthara's elliptical orbit
const planetPos = calculateEllipsePosition(centerX, centerY, planetOrbitRadius, planetEccentricity, planetPeriod, simulationTime, planetAngleOffset);
planetContainer.x = planetPos.x;
planetContainer.y = planetPos.y;
// Update planet container position.
planetContainer.x = planetX;
planetContainer.y = planetY;
// Planet rotates about its own axis with a 1-day period.
const planetRotationAngle = Phaser.Math.DegToRad((360 * (simulationTime % planetRotationPeriod)) / planetRotationPeriod);
planetContainer.rotation = planetRotationAngle;
const planetRotationAngle = Phaser.Math.DegToRad((360 * (simulationTime % planetRotationPeriod)) / planetRotationPeriod);
planetContainer.rotation = planetRotationAngle;
// Update night overlay so that the dark half covers the hemisphere away from the star.
const subsolarAngle = Phaser.Math.Angle.Between(planetX, planetY, centerX, centerY);
planetContainer.nightOverlay.rotation = subsolarAngle + Math.PI / 2 - planetContainer.rotation;
const subsolarAngle = Phaser.Math.Angle.Between(planetPos.x, planetPos.y, centerX, centerY);
planetContainer.nightOverlay.rotation = subsolarAngle + Math.PI / 2 - planetContainer.rotation;
// Draw moon orbital paths (elliptical) around Senthara.
// For each moon, compute semi-minor axis: b = a * sqrt(1 - ecc^2).
const bKeriel = kerielOrbitRadius * Math.sqrt(1 - kerielEcc * kerielEcc);
const bArkaen = arkaenOrbitRadius * Math.sqrt(1 - arkaenEcc * arkaenEcc);
const bMinian = minianOrbitRadius * Math.sqrt(1 - minianEcc * minianEcc);
globalGraphics.lineStyle(1, 0x888888, 1);
globalGraphics.strokeEllipse(planetX, planetY, 2 * kerielOrbitRadius, 2 * bKeriel);
globalGraphics.strokeEllipse(planetX, planetY, 2 * arkaenOrbitRadius, 2 * bArkaen);
globalGraphics.strokeEllipse(planetX, planetY, 2 * minianOrbitRadius, 2 * bMinian);
// Calculate and update moon positions (relative to Senthara, using elliptical orbits)
const kerielPos = calculateEllipsePosition(planetPos.x, planetPos.y, kerielOrbitRadius, kerielEccentricity, kerielPeriod, simulationTime, kerielAngleOffset);
kerielContainer.x = kerielPos.x;
kerielContainer.y = kerielPos.y;
kerielContainer.rotation = Phaser.Math.Angle.Between(kerielPos.x, kerielPos.y, planetPos.x, planetPos.y);
// Calculate and update moon positions relative to Senthara.
// Keriel:
const kerielPos = getEllipticalPosition(simulationTime, kerielPeriod, kerielOrbitRadius, kerielEcc);
const kerielX = planetX + kerielPos.x;
const kerielY = planetY + kerielPos.y;
kerielContainer.x = kerielX;
kerielContainer.y = kerielY;
kerielContainer.rotation = Phaser.Math.Angle.Between(kerielX, kerielY, planetX, planetY);
const arkaenPos = calculateEllipsePosition(planetPos.x, planetPos.y, arkaenOrbitRadius, arkaenEccentricity, arkaenPeriod, simulationTime, arkaenAngleOffset);
arkaenContainer.x = arkaenPos.x;
arkaenContainer.y = arkaenPos.y;
arkaenContainer.rotation = Phaser.Math.Angle.Between(arkaenPos.x, arkaenPos.y, planetPos.x, planetPos.y);
// Arkaen:
const arkaenPos = getEllipticalPosition(simulationTime, arkaenPeriod, arkaenOrbitRadius, arkaenEcc);
const arkaenX = planetX + arkaenPos.x;
const arkaenY = planetY + arkaenPos.y;
arkaenContainer.x = arkaenX;
arkaenContainer.y = arkaenY;
arkaenContainer.rotation = Phaser.Math.Angle.Between(arkaenX, arkaenY, planetX, planetY);
const minianPos = calculateEllipsePosition(planetPos.x, planetPos.y, minianOrbitRadius, minianEccentricity, minianPeriod, simulationTime, minianAngleOffset);
minianContainer.x = minianPos.x;
minianContainer.y = minianPos.y;
minianContainer.rotation = Phaser.Math.Angle.Between(minianPos.x, minianPos.y, planetPos.x, planetPos.y);
// Minian:
const minianPos = getEllipticalPosition(simulationTime, minianPeriod, minianOrbitRadius, minianEcc);
const minianX = planetX + minianPos.x;
const minianY = planetY + minianPos.y;
minianContainer.x = minianX;
minianContainer.y = minianY;
minianContainer.rotation = Phaser.Math.Angle.Between(minianX, minianY, planetX, planetY);
// Draw elliptical orbits (optional, for visualization)
drawEllipticalOrbit(globalGraphics, centerX, centerY, planetOrbitRadius, planetEccentricity, planetAngleOffset);
drawEllipticalOrbit(globalGraphics, planetPos.x, planetPos.y, kerielOrbitRadius, kerielEccentricity, kerielAngleOffset);
drawEllipticalOrbit(globalGraphics, planetPos.x, planetPos.y, arkaenOrbitRadius, arkaenEccentricity, arkaenAngleOffset);
drawEllipticalOrbit(globalGraphics, planetPos.x, planetPos.y, minianOrbitRadius, minianEccentricity, minianAngleOffset);
dateText.setText(getSentharaDate(simulationTime));
}
// Helper function to draw an elliptical orbit using Phaser graphics.
function drawEllipticalOrbit(graphics, centerX, centerY, semiMajorAxis, eccentricity, angleOffset) {
const points = [];
const steps = 100; // Number of points to create a smooth curve
for (let i = 0; i <= steps; i++) {
const meanAnomaly = (2 * Math.PI * i) / steps;
const eccentricAnomaly = approximateEccentricAnomaly(meanAnomaly, eccentricity);
const trueAnomaly = 2 * Math.atan2(
Math.sqrt(1 + eccentricity) * Math.sin(eccentricAnomaly / 2),
Math.sqrt(1 - eccentricity) * Math.cos(eccentricAnomaly / 2)
);
const distance = semiMajorAxis * (1 - eccentricity * Math.cos(eccentricAnomaly));
const x = centerX + distance * Math.cos(trueAnomaly + Phaser.Math.DegToRad(angleOffset));
const y = centerY + distance * Math.sin(trueAnomaly + Phaser.Math.DegToRad(angleOffset));
points.push(new Phaser.Math.Vector2(x, y));
}
graphics.lineStyle(1, 0x888888, 1); // Set orbit line style
graphics.strokePoints(points, true); // Draw the ellipse
}
</script>
// Update the Senthara calendar date text.
dateText.setText(getSentharaDate(simulationTime));
}
</script>
</body>
</html>