Added intercepts

src/calculations/constants.ts

@@ -86,6 +86,28 @@ export const Minmus: Body = {
 	initialMeridianLongitude: 4.014486824
 };
 
+export const Duna: Body = {
+	planetName: "Duna",
+	type: "planet",
+	radius: 320000,
+	gravitationalParameter: 3.0136321e11,
+	rotationPeriod: 65517.859,
+	sphereOfInfluence: 47921949,
+	closestSafeDistance: 50000,
+	initialMeridianLongitude: 0 // TODO: Fill in later
+}
+
+export const Ike: Body = {
+	planetName: "Ike",
+	type: "moon",
+	radius: 130000,
+	gravitationalParameter: 1.8568369e10,
+	rotationPeriod: 65517.852,
+	sphereOfInfluence: 1049598.9,
+	closestSafeDistance: 12900,
+	initialMeridianLongitude: 0 // TODO: Fill in later
+}
+
 export const PlanetList = new Map<string, Body>([
 	[Kerbol.planetName, Kerbol],
 	[Moho.planetName, Moho],
@@ -93,7 +115,9 @@ export const PlanetList = new Map<string, Body>([
 	[Gilly.planetName, Gilly],
 	[Kerbin.planetName, Kerbin],
 	[Mun.planetName, Mun],
-	[Minmus.planetName, Minmus]
+	[Minmus.planetName, Minmus],
+	[Duna.planetName, Duna],
+	[Ike.planetName, Ike]
 ]);
 
 export function getPlanetByName(name: string): Body {

src/calculations/orbit-calculations.ts

@@ -115,7 +115,7 @@ export class LambertSolutions {
 		this.goalVelocity = multiplyMatrixWithScalar(goalSpeed, this.goalLocalVectors.prograde);
 
 		this.extremalGamma = -(this.positionOneMagnitude*this.positionTwoMagnitude - vectorDotProduct(this.positionOne, this.positionTwo)) / vectorDotProduct(this.normalVector, (crossProduct));
-		this.parabolaGamma = Math.sqrt(2*this.positionOneMagnitude*this.positionTwoMagnitude - vectorDotProduct(this.positionOne, this.positionTwo)) / getVectorMagnitude(addVector(this.positionOne, this.positionTwo));
+		this.parabolaGamma = Math.sqrt(2*(this.positionOneMagnitude*this.positionTwoMagnitude - vectorDotProduct(this.positionOne, this.positionTwo))) / getVectorMagnitude(addVector(this.positionOne, this.positionTwo));
 	}
 
 	getTransfer(gamma: number): Transfer {
@@ -334,6 +334,7 @@ export function getOrbitalCoordinates(timeToPeriapsis: number, orbit: Orbit, pla
 }
 
 export function getTimeBetweenTrueAnomalies(startingTrueAnomaly: number, endingTrueAnomaly: number, orbit: Orbit, planet: Body): number {
+	let extraTime = 0;
 	if (Math.abs(orbit.eccentricity - 1) < 0.00001) {
 		// Parabola. Solve using Barker's equation
 		const startingD = Math.tan(startingTrueAnomaly / 2);
@@ -364,6 +365,13 @@ export function getTimeBetweenTrueAnomalies(startingTrueAnomaly: number, endingT
 			while (endingMeanAnomaly < startingMeanAnomaly) {
 				endingMeanAnomaly += 2*Math.PI;
 			}
+
+			// Add extra orbits if necessary
+			if (endingTrueAnomaly > startingTrueAnomaly + 2 * Math.PI) {
+				let orbitalPeriod = 2 * Math.PI * Math.sqrt(orbit.semiLatusRectum**3 / (planet.gravitationalParameter * (1 - orbit.eccentricity**2)**3));
+				let extraOrbits = Math.floor((endingTrueAnomaly - startingTrueAnomaly) / (2 * Math.PI));
+				extraTime = extraOrbits * orbitalPeriod;
+			}
 		} else {
 			const startingEccentricAnomaly = 2*Math.atanh(Math.sqrt((orbit.eccentricity - 1)/(orbit.eccentricity + 1)) * Math.tan(startingTrueAnomaly / 2));
 			const endingEccentricAnomaly = 2*Math.atanh(Math.sqrt((orbit.eccentricity - 1)/(orbit.eccentricity + 1)) * Math.tan(endingTrueAnomaly / 2));
@@ -375,7 +383,7 @@ export function getTimeBetweenTrueAnomalies(startingTrueAnomaly: number, endingT
 		const startingTime = Math.sqrt(orbit.semiLatusRectum**3 / (planet.gravitationalParameter * Math.abs(1 - orbit.eccentricity**2)**3)) * startingMeanAnomaly;
 		const endingTime = Math.sqrt(orbit.semiLatusRectum**3 / (planet.gravitationalParameter * Math.abs(1 - orbit.eccentricity**2)**3)) * endingMeanAnomaly;
 
-		return endingTime - startingTime;
+		return endingTime - startingTime + extraTime;
 	}
 }
 
@@ -524,7 +532,9 @@ export function findCheapestLambertSolution(lambertSolutions: LambertSolutions):
 	return bestTransfer;
 }
 
-export function findCheapestTransfer(startingSituation: OrbitalCoordinates, targetOrbit: Orbit, body: Body, progressCallback?: (anomaliesChecked: number, totalAnomalies: number, currentBestDeltaV: number | null, currentBestTransfer: Transfer | null) => void): Transfer | null {
+export type ProgressCallbackFunction = (transfersChecked: number, totalNumberOfTransfers: number, currentBestDeltaV: number | null, currentBestTransfer: Transfer | null) => void;
+
+export function findCheapestTransfer(startingSituation: OrbitalCoordinates, targetOrbit: Orbit, body: Body, progressCallback?: ProgressCallbackFunction): Transfer | null {
 	// First, create a set of starting true anomalies
 	let startingTrueAnomalies = [];
 
@@ -607,5 +617,167 @@ export function findCheapestTransfer(startingSituation: OrbitalCoordinates, targ
 		})
 	});
 
+	return bestTransfer;
+}
+
+export function findLambertSolutionsWithCorrectTime(lambertSolutions: LambertSolutions, expectedTime: number): Transfer | null{	
+	const step = lambertSolutions.parabolaGamma - lambertSolutions.extremalGamma;
+
+	const getGamma = (steps: number) => {
+		return lambertSolutions.extremalGamma + steps*step;
+	}
+
+	let lowerSteps = 0;
+	let lowerTransfer = lambertSolutions.getTransfer(getGamma(lowerSteps));
+	let lowerTime = 0;
+
+	let upperSteps = 1;
+	let upperTransfer = lambertSolutions.getTransfer(getGamma(upperSteps));
+	let upperTime = upperTransfer.secondManoeuvre.time;
+
+	let foundWindow = false;
+	// Find window that contains transfer
+	for (let windowAttempts = 0; windowAttempts < 100; windowAttempts++) {
+		if (upperTime < 0 || expectedTime < upperTime) {
+			foundWindow = true;
+			break;
+		}
+
+		lowerSteps = upperSteps;
+		lowerTransfer = upperTransfer;
+		lowerTime = upperTime;
+
+		upperSteps += 1;
+		upperTransfer = lambertSolutions.getTransfer(getGamma(upperSteps));
+		upperTime = upperTransfer.secondManoeuvre.time;
+	}
+
+	if (!foundWindow) {
+		return null;
+	}
+
+	const acceptablyClose = 0.5;
+	const numberOfAttempts = 200;
+
+	for (let attempts = 0; attempts < numberOfAttempts; attempts++) {
+		if (Math.abs(lowerTime - expectedTime) < acceptablyClose) {
+			return lowerTransfer;
+		}
+
+		if (Math.abs(upperTime - expectedTime) < acceptablyClose) {
+			return upperTransfer;
+		}
+
+		let middleSteps = (upperSteps + lowerSteps) / 2;
+		let middleTransfer = lambertSolutions.getTransfer(getGamma(middleSteps));
+		let middleTime = middleTransfer.secondManoeuvre.time;
+
+		if (middleTime > 0 && middleTime < expectedTime) {
+			lowerSteps = middleSteps;
+			lowerTransfer = middleTransfer;
+			lowerTime = middleTime;
+		} else {
+			upperSteps = middleSteps;
+			upperTransfer = middleTransfer;
+			upperTime = middleTime;
+		}
+	}
+
+	return null;
+}
+
+export function findCheapestIntercept(startingSituation: OrbitalCoordinates, targetSituation: OrbitalCoordinates, body: Body, extraTrueAnomaly: number, progressCallback?: ProgressCallbackFunction): Transfer | null {
+	// Find acceptable intercept times
+	// First number is intercept time, second number is true anomaly
+	let starts: [number, number][] = [];
+	let intercepts: [number, number][] = [];
+
+	// Check if the starting orbit is stable0
+	let startingOrbitStable = false;
+	if (startingSituation.orbit.eccentricity < 1) {
+		let startingApoapsis = startingSituation.orbit.semiLatusRectum / (1 - startingSituation.orbit.eccentricity);
+		if (startingApoapsis < body.sphereOfInfluence) {
+			startingOrbitStable = true;
+		}
+	}
+
+	// Next, check if intercept orbit is stable
+	let interceptOrbitStable = false;
+	if (targetSituation.orbit.eccentricity < 1) {
+		let targetApoapsis = targetSituation.orbit.semiLatusRectum / (1 - targetSituation.orbit.eccentricity);
+		if (targetApoapsis < body.sphereOfInfluence) {
+			interceptOrbitStable = true;
+		}
+	}
+
+	if (interceptOrbitStable && startingOrbitStable) {
+		// If both orbits are stable, we'll check for three whole orbits of the largest orbit
+		let startingOrbitPeriod = getTimeBetweenTrueAnomalies(0, 2*Math.PI, startingSituation.orbit, body);
+		let targetOrbitPeriod = getTimeBetweenTrueAnomalies(0, 2*Math.PI, targetSituation.orbit, body);
+
+		let maxStartTime = 3 * Math.max(startingOrbitPeriod, targetOrbitPeriod);
+		let maxEndTime = 4 * Math.max(startingOrbitPeriod, targetOrbitPeriod);
+
+		let anomalyCounter = 0;
+		while (true) {
+			let possibleStart = startingSituation.trueAnomaly + anomalyCounter * 2 * Math.PI / 100;
+			let possibleStartTime = getTimeBetweenTrueAnomalies(startingSituation.trueAnomaly, possibleStart, startingSituation.orbit, body);
+			if (possibleStartTime > maxStartTime) {
+				break;
+			}
+
+			starts.push([possibleStartTime, possibleStart]);
+			anomalyCounter += 1;
+		}
+
+		anomalyCounter = 0;
+		while (true) {
+			let possibleEnd = targetSituation.trueAnomaly + anomalyCounter * 2 * Math.PI / 100.0;
+			let possibleEndTime = getTimeBetweenTrueAnomalies(targetSituation.trueAnomaly, possibleEnd, targetSituation.orbit, body);
+			possibleEnd += extraTrueAnomaly;
+
+			if (possibleEndTime > maxEndTime) {
+				break;
+			}
+
+			intercepts.push([possibleEndTime, possibleEnd]);
+			anomalyCounter += 1;
+		}
+	}
+
+	let pairs: [number, number, number, number][] = [];
+	starts.forEach(([startingTime, startingTrueAnomaly]) => {
+		intercepts.forEach(([endingTime, endingTrueAnomaly]) => {
+			if (endingTime > startingTime) {
+				pairs.push([startingTime, startingTrueAnomaly, endingTime, endingTrueAnomaly]);
+			}
+		});
+	});
+
+	let bestDeltaV: number | null = null;
+	let bestTransfer: Transfer | null = null;
+
+	pairs.forEach(([startingTime, startingTrueAnomaly, endingTime, endingTrueAnomaly], index) => {
+		let transferTime = endingTime - startingTime;
+		[true, false].forEach(goBackwards => {
+			let lambertSolutions = new LambertSolutions(startingSituation.orbit, startingTrueAnomaly, targetSituation.orbit, endingTrueAnomaly, body, goBackwards);
+			let transfer = findLambertSolutionsWithCorrectTime(lambertSolutions, transferTime);
+			if (transfer !== null && transfer.closestPointDistance > body.closestSafeDistance && transfer.farthestPointDistance < body.sphereOfInfluence) {
+				let totalDeltaV = transfer.firstManoeuvre.totalDeltaV + transfer.secondManoeuvre.totalDeltaV;
+				if (bestDeltaV == null || totalDeltaV < bestDeltaV) {
+					bestDeltaV = totalDeltaV;
+					bestTransfer = transfer;
+
+					bestTransfer.firstManoeuvre.time += startingTime;
+					bestTransfer.secondManoeuvre.time += startingTime;
+				}
+			}
+		});
+
+		if (progressCallback) {
+			progressCallback(index+1, pairs.length, bestDeltaV, bestTransfer);
+		}
+	});
+	
 	return bestTransfer;
 }

src/gui/intercept.ts

@@ -0,0 +1,270 @@
+import { getOrbitalCoordinates } from "../calculations/orbit-calculations";
+import type { Wrapper } from "../storage";
+import { createDisabledInput, createLabel, createNumberInput, getOrbitFromParameters, type OrbitalParameters } from "./common";
+import { OrbitalParametersGui } from "./orbit";
+import { type Body } from "../calculations/constants";
+import type { FindBestInterceptMessage, FindBestTransferResponse } from "./worker";
+import { TimeGui } from "./time";
+
+export class InterceptTargetGui {
+	listeners: ((newTargetOrbitalParameters: OrbitalParameters, newTargetTimeToPeriapsis: number, newAdditionalTrueAnomaly: number) => void)[];
+
+	startingParameters: Wrapper<OrbitalParameters>;
+	goalParameters: Wrapper<OrbitalParameters>;
+	currentTime: Wrapper<number>;
+	timeToPeriapsis: Wrapper<number>;
+	body: Wrapper<Body>;
+	targetTimeToPeriapsis: number;
+	additionalTrueAnomaly: number;
+
+	orbitGui: OrbitalParametersGui;
+	timeGui: TimeGui;
+	parentDiv: HTMLDivElement;
+
+	progressParagraph: HTMLParagraphElement;
+
+	firstManoeuvreTime: HTMLInputElement;
+	firstManoeuvrePrograde: HTMLInputElement;
+	firstManoeuvreNormal: HTMLInputElement;
+	firstManoeuvreRadial: HTMLInputElement;
+	firstManoeuvreTotal: HTMLInputElement;
+
+	secondManoeuvreTime: HTMLInputElement;
+	secondManoeuvrePrograde: HTMLInputElement;
+	secondManoeuvreNormal: HTMLInputElement;
+	secondManoeuvreRadial: HTMLInputElement;
+	secondManoeuvreTotal: HTMLInputElement;
+
+	worker: Worker | null;
+
+	constructor(startingParameters: Wrapper<OrbitalParameters>, goalParameters: Wrapper<OrbitalParameters>, currentTime: Wrapper<number>, timeToPeriapsis: Wrapper<number>, body: Wrapper<Body>, defaultTargetTimeToPeriapsis?: number, defaultAdditionalTrueAnomaly?: number) {
+		this.listeners = [];
+
+		this.startingParameters = startingParameters;
+		this.goalParameters = goalParameters;
+		this.currentTime = currentTime;
+		this.timeToPeriapsis = timeToPeriapsis;
+		this.body = body;
+
+		this.parentDiv = document.createElement("div");
+		let parametersHeader = document.createElement("h3");
+		parametersHeader.appendChild(document.createTextNode("Target orbit:"));
+		this.parentDiv.appendChild(parametersHeader);
+
+		let orbitalParameterContainerCreator = () => {
+			let orbitalParameterContainer = document.createElement("div");
+			orbitalParameterContainer.classList.add("orbitalParameter");
+			return orbitalParameterContainer;
+		}
+
+		this.orbitGui = new OrbitalParametersGui(this.parentDiv, goalParameters.value, orbitalParameterContainerCreator);
+
+		let targetTimeToPeriapsisHeader = document.createElement("h3");
+		targetTimeToPeriapsisHeader.appendChild(document.createTextNode("Target time to periapsis:"));
+		this.parentDiv.appendChild(targetTimeToPeriapsisHeader);
+
+		if (!defaultTargetTimeToPeriapsis) {
+			defaultTargetTimeToPeriapsis = 0;
+		}
+		this.targetTimeToPeriapsis = defaultTargetTimeToPeriapsis;
+		this.timeGui = new TimeGui(this.parentDiv, false, defaultTargetTimeToPeriapsis);
+
+		this.parentDiv.appendChild(document.createElement("br"));
+
+		let additionalTrueAnomalyId = crypto.randomUUID();
+		let additionalTrueAnomalyLabel = createLabel(additionalTrueAnomalyId, "Additional true anomaly (0 for intercept):");
+		let additionalTrueAnomalyInput = createNumberInput(additionalTrueAnomalyId, -360, 360);
+
+		if (!defaultAdditionalTrueAnomaly) {
+			this.additionalTrueAnomaly = 0;
+		} else {
+			this.additionalTrueAnomaly = defaultAdditionalTrueAnomaly;
+		}
+
+		additionalTrueAnomalyInput.setAttribute("value", (this.additionalTrueAnomaly * 180 / Math.PI).toString());
+
+		this.parentDiv.appendChild(additionalTrueAnomalyLabel);
+		this.parentDiv.appendChild(additionalTrueAnomalyInput);
+		
+		this.parentDiv.appendChild(document.createElement("br"));
+		this.parentDiv.appendChild(document.createElement("br"));
+
+		let searchButton = document.createElement("button");
+		searchButton.appendChild(document.createTextNode("Search for cheapest intercept"));
+		this.parentDiv.appendChild(searchButton);
+
+		let searchHeader = document.createElement("h3");
+		searchHeader.appendChild(document.createTextNode("Manoeuvre search"));
+		this.parentDiv.appendChild(searchHeader);
+
+		this.progressParagraph = document.createElement("p");
+		this.parentDiv.appendChild(this.progressParagraph);
+
+		let manoeuvresContainer = document.createElement("div");
+		manoeuvresContainer.classList.add("flexContainer");
+
+		this.parentDiv.appendChild(manoeuvresContainer)
+
+		let manoeuvreOneContainer = document.createElement("div");
+		let manoeuvreTwoContainer = document.createElement("div");
+
+		manoeuvresContainer.appendChild(manoeuvreOneContainer);
+		manoeuvresContainer.appendChild(manoeuvreTwoContainer);
+
+		let manoeuvreOneHeader = document.createElement("h4");
+		manoeuvreOneHeader.appendChild(document.createTextNode("First manoeuvre:"));
+		manoeuvreOneContainer.appendChild(manoeuvreOneHeader);
+		let manoeuvreTwoHeader = document.createElement("h4");
+		manoeuvreTwoHeader.appendChild(document.createTextNode("Second manoeuvre:"));
+		manoeuvreTwoContainer.appendChild(manoeuvreTwoHeader);
+
+		const addTo = (container: HTMLElement, children: HTMLElement[]) => {
+			children.forEach(child => {
+				container.appendChild(child);
+			})
+			container.appendChild(document.createElement("br"));
+		};
+
+		let firstTimeId = crypto.randomUUID();
+		let firstTimeLabel = createLabel(firstTimeId, "Time:");
+		this.firstManoeuvreTime = createDisabledInput(firstTimeId);
+		addTo(manoeuvreOneContainer, [firstTimeLabel, this.firstManoeuvreTime]);
+
+		let firstProgradeId = crypto.randomUUID();
+		let firstProgradeLabel = createLabel(firstProgradeId, "Prograde delta-v:");
+		this.firstManoeuvrePrograde = createDisabledInput(firstProgradeId);
+		addTo(manoeuvreOneContainer, [firstProgradeLabel, this.firstManoeuvrePrograde]);
+
+		let firstNormalId = crypto.randomUUID();
+		let firstNormalLabel = createLabel(firstNormalId, "Normal delta-v:");
+		this.firstManoeuvreNormal = createDisabledInput(firstNormalId);
+		addTo(manoeuvreOneContainer, [firstNormalLabel, this.firstManoeuvreNormal]);
+
+		let firstRadialId = crypto.randomUUID();
+		let firstRadialLabel = createLabel(firstRadialId, "Radial delta-v:");
+		this.firstManoeuvreRadial = createDisabledInput(firstRadialId);
+		addTo(manoeuvreOneContainer, [firstRadialLabel, this.firstManoeuvreRadial]);
+
+		let firstTotalId = crypto.randomUUID();
+		let firstTotalLabel = createLabel(firstTotalId, "Total delta-v:");
+		this.firstManoeuvreTotal = createDisabledInput(firstTotalId);
+		addTo(manoeuvreOneContainer, [firstTotalLabel, this.firstManoeuvreTotal]);
+
+		let secondTimeId = crypto.randomUUID();
+		let secondTimeLabel = createLabel(secondTimeId, "Time:");
+		this.secondManoeuvreTime = createDisabledInput(secondTimeId);
+		addTo(manoeuvreTwoContainer, [secondTimeLabel, this.secondManoeuvreTime]);
+
+		let secondProgradeId = crypto.randomUUID();
+		let secondProgradeLabel = createLabel(secondProgradeId, "Prograde delta-v:");
+		this.secondManoeuvrePrograde = createDisabledInput(secondProgradeId);
+		addTo(manoeuvreTwoContainer, [secondProgradeLabel, this.secondManoeuvrePrograde]);
+
+		let secondNormalId = crypto.randomUUID();
+		let secondNormalLabel = createLabel(secondNormalId, "Normal delta-v:");
+		this.secondManoeuvreNormal = createDisabledInput(secondNormalId);
+		addTo(manoeuvreTwoContainer, [secondNormalLabel, this.secondManoeuvreNormal]);
+
+		let secondRadialId = crypto.randomUUID();
+		let secondRadialLabel = createLabel(secondRadialId, "Radial delta-v:");
+		this.secondManoeuvreRadial = createDisabledInput(secondRadialId);
+		addTo(manoeuvreTwoContainer, [secondRadialLabel, this.secondManoeuvreRadial]);
+
+		let secondTotalId = crypto.randomUUID();
+		let secondTotalLabel = createLabel(secondTotalId, "Total delta-v:");
+		this.secondManoeuvreTotal = createDisabledInput(secondTotalId);
+		addTo(manoeuvreTwoContainer, [secondTotalLabel, this.secondManoeuvreTotal]);
+
+		this.worker = null;
+
+		searchButton.addEventListener("click", () => {
+			if (this.worker !== null) {
+				this.worker.terminate();
+				this.worker = null;
+				searchButton.innerHTML = "Search for cheapest intercept";
+			} else {
+				searchButton.innerHTML = "Cancel search";
+
+				let startingOrbit = getOrbitFromParameters(startingParameters.value, this.body.value.radius);
+				let endingOrbit = getOrbitFromParameters(goalParameters.value, this.body.value.radius);
+				let currentCoordinates = getOrbitalCoordinates(timeToPeriapsis.value, startingOrbit, this.body.value);
+				let targetCoordinates = getOrbitalCoordinates(this.targetTimeToPeriapsis, endingOrbit, this.body.value);
+
+				this.worker = new Worker(new URL('./worker.ts', import.meta.url), {type: 'module'});
+				this.worker.addEventListener("message", event => {
+					let transferResponse = event.data as FindBestTransferResponse;
+					if (transferResponse) {
+						if (transferResponse.finished) {
+							searchButton.innerHTML = "Search for cheapest intercept";
+							this.worker = null;
+						}
+
+						this.progressParagraph.innerHTML = "";
+						this.progressParagraph.appendChild(document.createTextNode(`Search is ${transferResponse.percentDone.toFixed(2)}% finished`));
+						if (transferResponse.bestDeltaV !== null && transferResponse.bestTransfer != null) {
+							this.progressParagraph.appendChild(document.createElement("br"));
+							this.progressParagraph.appendChild(document.createTextNode(`Best transfer costs ${transferResponse.bestDeltaV.toFixed(3)} m/s`));
+
+							let transfer = transferResponse.bestTransfer;
+
+							transfer.firstManoeuvre.time += currentTime.value;
+							transfer.secondManoeuvre.time += currentTime.value;
+
+							this.firstManoeuvreTime.value = transfer.firstManoeuvre.time.toFixed(0);
+							this.firstManoeuvrePrograde.value = transfer.firstManoeuvre.progradeDeltaV.toFixed(2);
+							this.firstManoeuvreNormal.value = transfer.firstManoeuvre.normalDeltaV.toFixed(2);
+							this.firstManoeuvreRadial.value = transfer.firstManoeuvre.radialDeltaV.toFixed(2);
+							this.firstManoeuvreTotal.value = transfer.firstManoeuvre.totalDeltaV.toFixed(2);
+
+							this.secondManoeuvreTime.value = transfer.secondManoeuvre.time.toFixed(0);
+							this.secondManoeuvrePrograde.value = transfer.secondManoeuvre.progradeDeltaV.toFixed(2);
+							this.secondManoeuvreNormal.value = transfer.secondManoeuvre.normalDeltaV.toFixed(2);
+							this.secondManoeuvreRadial.value = transfer.secondManoeuvre.radialDeltaV.toFixed(2);
+							this.secondManoeuvreTotal.value = transfer.secondManoeuvre.totalDeltaV.toFixed(2);
+						}
+					}
+				});
+
+				let workerMessage: FindBestInterceptMessage = {
+					type: "FindBestIntercept",
+					startingSituation: currentCoordinates,
+					targetSituation: targetCoordinates,
+					body: body.value,
+					additionalTrueAnomaly: this.additionalTrueAnomaly
+				};
+
+				this.worker.postMessage(workerMessage);
+			}
+		});
+
+		// Add some listeners
+		this.orbitGui.addListener((newValue) => {
+			this.listeners.forEach(listener => {
+				listener(newValue, this.targetTimeToPeriapsis, this.additionalTrueAnomaly);
+			})
+		});
+
+		this.timeGui.addListener((newDate: number) => {
+			this.targetTimeToPeriapsis = newDate;
+			this.listeners.forEach(listener => {
+				listener(goalParameters.value, newDate, this.additionalTrueAnomaly);
+			})
+		});
+
+		additionalTrueAnomalyInput.addEventListener("change", () => {
+			this.additionalTrueAnomaly = parseFloat(additionalTrueAnomalyInput.value) * Math.PI / 180.0;
+			this.listeners.forEach(listener => {
+				listener(goalParameters.value, this.targetTimeToPeriapsis, this.additionalTrueAnomaly);
+			})
+		});
+	}
+
+	addToParentElement(parentElement: HTMLElement) {
+		this.orbitGui.setValues(this.goalParameters.value);
+		parentElement.appendChild(this.parentDiv);
+	}
+
+	addListener(listener: (newValue: OrbitalParameters, newTargetTimeToPeriapsis: number, newAdditionalTrueAnomaly: number) => void) {
+		this.listeners.push(listener);
+	}
+}

src/gui/worker.ts

@@ -1,5 +1,5 @@
 import type { Body } from "../calculations/constants";
-import { findCheapestTransfer, type Orbit, type OrbitalCoordinates, type Transfer } from "../calculations/orbit-calculations";
+import { findCheapestIntercept, findCheapestTransfer, type Orbit, type OrbitalCoordinates, type Transfer } from "../calculations/orbit-calculations";
 
 const ctx: Worker = self as any;
 
@@ -18,25 +18,34 @@ export interface FindBestTransferResponse {
 	bestTransfer: Transfer | null
 }
 
+export interface FindBestInterceptMessage {
+	type: "FindBestIntercept",
+	startingSituation: OrbitalCoordinates,
+	targetSituation: OrbitalCoordinates,
+	additionalTrueAnomaly: number,
+	body: Body;
+}
+
 ctx.addEventListener("message", event => {
-	let findBestTransferMessage = event.data as FindBestTransferMessage;
-	if (findBestTransferMessage) {
-		const progressCallback = (numberChecked: number, totalNumber: number, bestDeltaV: number | null, bestTransfer: Transfer | null) => {
-			if (numberChecked % 100 == 0) {
-				let percentDone = numberChecked * 100 / totalNumber;
-				let message: FindBestTransferResponse = {
-					type: "FindBestTransferResponse",
-					finished: false,
-					percentDone: percentDone,
-					bestDeltaV: bestDeltaV,
-					bestTransfer: bestTransfer
-				};
+	const progressCallback = (numberChecked: number, totalNumber: number, bestDeltaV: number | null, bestTransfer: Transfer | null) => {
+		if (numberChecked % 100 == 0) {
+			let percentDone = numberChecked * 100 / totalNumber;
+			let message: FindBestTransferResponse = {
+				type: "FindBestTransferResponse",
+				finished: false,
+				percentDone: percentDone,
+				bestDeltaV: bestDeltaV,
+				bestTransfer: bestTransfer
+			};
 
-				ctx.postMessage(message);
-			}
+			ctx.postMessage(message);
 		}
+	};
 
-		let bestTransfer = findCheapestTransfer(findBestTransferMessage.startingSituation, findBestTransferMessage.targetOrbit, findBestTransferMessage.body, progressCallback);
+	let message = event.data as FindBestTransferMessage | FindBestInterceptMessage;
+	if (message.type == "FindBestTransfer") {
+		console.log("Finding best transfer");
+		let bestTransfer = findCheapestTransfer(message.startingSituation, message.targetOrbit, message.body, progressCallback);
 		let bestDeltaV = null;
 		if (bestTransfer) {
 			bestDeltaV = bestTransfer.firstManoeuvre.totalDeltaV + bestTransfer.secondManoeuvre.totalDeltaV;
@@ -51,4 +60,23 @@ ctx.addEventListener("message", event => {
 		};
 		ctx.postMessage(finishedMessage);
 	}
+
+	if (message.type == "FindBestIntercept") {
+		console.log("Finding best intercept");
+		let bestIntercept = findCheapestIntercept(message.startingSituation, message.targetSituation, message.body, message.additionalTrueAnomaly, progressCallback);
+		let bestDeltaV = null;
+		if (bestIntercept) {
+			bestDeltaV = bestIntercept.firstManoeuvre.totalDeltaV + bestIntercept.secondManoeuvre.totalDeltaV;
+		}
+
+		let finishedMessage: FindBestTransferResponse = {
+			type: "FindBestTransferResponse",
+			finished: true,
+			percentDone: 100,
+			bestDeltaV: bestDeltaV,
+			bestTransfer: bestIntercept
+		};
+
+		ctx.postMessage(finishedMessage);
+	}
 });

src/main.ts

@@ -8,8 +8,9 @@ import { TimeGui } from "./gui/time";
 import { createLocalStorageVariable } from "./storage";
 import { SimplePlaneChangeGui } from "./gui/simpleplanechange";
 import { TargetOrbitGui } from "./gui/targetorbit";
+import { InterceptTargetGui } from "./gui/intercept";
 
-type CalculationType = "planeChange" | "targetOrbit";
+type CalculationType = "planeChange" | "targetOrbit" | "intercept";
 function decodeCalculationType(input: string): CalculationType {
 	let calculationType = input as CalculationType;
 	if (calculationType !== undefined) {
@@ -24,9 +25,10 @@ let [timeToPeriapsis, setTimeToPeriapsis] = createLocalStorageVariable("timeToPe
 let [planet, setPlanet] = createLocalStorageVariable("planet", getPlanetByName, p => p.planetName, Kerbol);
 let [orbitalParameters, setOrbitalParameters] = createLocalStorageVariable("orbitalParameters", decodeOrbitalParameters, encodeOrbitalParameters, DefaultOrbitalParameters);
 let [calculationType, setCalculationType] = createLocalStorageVariable("calculationType", decodeCalculationType, s => s, "planeChange");
-
 let [targetOrbitalParameters, setTargetOrbitalParameters] = createLocalStorageVariable("targetOrbitalParameters", decodeOrbitalParameters, encodeOrbitalParameters, DefaultOrbitalParameters);
 let [circularizeOrbit, setCircularizeOrbit] = createLocalStorageVariable("circularizeOrbit", s => s == "true", bool => bool ? "true" : "false", false)
+let [targetTimeToPeriapsis, setTargetTimeToPeriapsis] = createLocalStorageVariable("targetTimeToPeriapsis", parseInt, n => n.toFixed(0), 0);
+let [additionalTrueAnomaly, setAdditionalTrueanomaly] = createLocalStorageVariable("additionalTrueAnomaly", parseFloat, n => n.toString(), 0);
 
 let dateInputContainerCreator = () => {
 	let dateInputContainer = document.createElement("span");
@@ -79,6 +81,13 @@ simplePlaneChangeGui.addListener((targetInclination, targetLongitudeOfAscendingN
 const targetOrbitGui = new TargetOrbitGui(orbitalParameters, targetOrbitalParameters, currentTime, timeToPeriapsis, planet);
 targetOrbitGui.addListener(setTargetOrbitalParameters);
 
+const interceptTargetGui: InterceptTargetGui = new InterceptTargetGui(orbitalParameters, targetOrbitalParameters, currentTime, timeToPeriapsis, planet, targetTimeToPeriapsis.value, additionalTrueAnomaly.value);
+interceptTargetGui.addListener((newTargetParameters, newTargetTimeToPeriapsis, newAdditionalTrueAnomaly) => {
+	setTargetOrbitalParameters(newTargetParameters);
+	setTargetTimeToPeriapsis(newTargetTimeToPeriapsis);
+	setAdditionalTrueanomaly(newAdditionalTrueAnomaly);
+});
+
 function populateCalculationDiv() {
 	calculationDiv.innerHTML = "";
 	calculationDiv.className = "";
@@ -87,8 +96,10 @@ function populateCalculationDiv() {
 		simplePlaneChangeGui.addToParentElement(calculationDiv);
 	} else if (calculationType.value == "targetOrbit") {
 		calculationDiv.classList.add("targetOrbit");
-		targetOrbitGui
 		targetOrbitGui.addToParentElement(calculationDiv);
+	} else if (calculationType.value == "intercept") {
+		calculationDiv.classList.add("intercept");
+		interceptTargetGui.addToParentElement(calculationDiv);
 	}
 }
 
@@ -130,4 +141,15 @@ if (calculationType.value == "targetOrbit") {
 targetOrbitButton.addEventListener("change", () => {
 	setCalculationType("targetOrbit");
 	populateCalculationDiv();
-});
+});
+
+let [interceptTargetButton, interceptTargetLabel] = createRadioButton("calculationType", "it", "Intercept target");
+choiceDiv.appendChild(interceptTargetButton);
+choiceDiv.appendChild(interceptTargetLabel);
+if (calculationType.value == "intercept") {
+	interceptTargetButton.setAttribute("checked", "");
+}
+interceptTargetButton.addEventListener("change", () => {
+	setCalculationType("intercept");
+	populateCalculationDiv();
+})