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ModuleSolarSail.cs
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ModuleSolarSail.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEngine;
namespace FNPlugin {
class ModuleSolarSail : PartModule {
// Persistent True
[KSPField(isPersistant = true)]
public bool IsEnabled = false;
// Persistent False
[KSPField]
public float reflectedPhotonRatio = 1f;
[KSPField]
public float surfaceArea; // Surface area of the panel.
[KSPField]
public string animName;
// GUI
[KSPField(guiActive = true, guiName = "Force")]
protected string forceAcquired = "";
[KSPField(guiActive = true, guiName = "Acceleration")]
protected string solarAcc = "";
protected Transform surfaceTransform = null;
protected Animation solarSailAnim = null;
const double kerbin_distance = 13599840256;
const double thrust_coeff = 9.08e-6;
protected double solar_force_d = 0;
protected double solar_acc_d = 0;
protected long count = 0;
[KSPEvent(guiActive = true, guiName = "Deploy Sail", active = true)]
public void DeploySail() {
if (animName != null && solarSailAnim != null) {
solarSailAnim[animName].speed = 1f;
solarSailAnim[animName].normalizedTime = 0f;
solarSailAnim.Blend(animName, 2f);
}
IsEnabled = true;
}
[KSPEvent(guiActive = true, guiName = "Retract Sail", active = false)]
public void RetractSail() {
if (animName != null && solarSailAnim != null) {
solarSailAnim[animName].speed = -1f;
solarSailAnim[animName].normalizedTime = 1f;
solarSailAnim.Blend(animName, 2f);
}
IsEnabled = false;
}
public override void OnStart(StartState state) {
if (state != StartState.None && state != StartState.Editor) {
//surfaceTransform = part.FindModelTransform(surfaceTransformName);
//solarSailAnim = (ModuleAnimateGeneric)part.Modules["ModuleAnimateGeneric"];
if (animName != null) {
solarSailAnim = part.FindModelAnimators(animName).FirstOrDefault();
}
if (IsEnabled) {
solarSailAnim[animName].speed = 1f;
solarSailAnim[animName].normalizedTime = 0f;
solarSailAnim.Blend(animName, 0.1f);
}
this.part.force_activate();
}
}
public override void OnUpdate() {
Events["DeploySail"].active = !IsEnabled;
Events["RetractSail"].active = IsEnabled;
Fields["solarAcc"].guiActive = IsEnabled;
Fields["forceAcquired"].guiActive = IsEnabled;
forceAcquired = solar_force_d.ToString("E") + " N";
solarAcc = solar_acc_d.ToString("E") + " m/s";
}
public override void OnFixedUpdate() {
if (FlightGlobals.fetch != null) {
solar_force_d = 0;
if (!IsEnabled) { return; }
double sunlightFactor = 1.0;
Vector3 sunVector = FlightGlobals.fetch.bodies[0].position - part.orgPos;
if (!PluginHelper.lineOfSightToSun(vessel)) {
sunlightFactor = 0.0f;
}
//Debug.Log("Detecting sunlight: " + sunlightFactor.ToString());
Vector3d solarForce = CalculateSolarForce() * sunlightFactor;
//print(surfaceArea);
Vector3d solar_accel = solarForce / vessel.GetTotalMass() / 1000.0 * TimeWarp.fixedDeltaTime;
if (!this.vessel.packed) {
vessel.ChangeWorldVelocity(solar_accel);
} else {
if (sunlightFactor > 0) {
double temp1 = solar_accel.y;
solar_accel.y = solar_accel.z;
solar_accel.z = temp1;
Vector3d position = vessel.orbit.getRelativePositionAtUT(Planetarium.GetUniversalTime());
Orbit orbit2 = new Orbit(vessel.orbit.inclination, vessel.orbit.eccentricity, vessel.orbit.semiMajorAxis, vessel.orbit.LAN, vessel.orbit.argumentOfPeriapsis, vessel.orbit.meanAnomalyAtEpoch, vessel.orbit.epoch, vessel.orbit.referenceBody);
orbit2.UpdateFromStateVectors(position, vessel.orbit.vel + solar_accel, vessel.orbit.referenceBody, Planetarium.GetUniversalTime());
//print(orbit2.timeToAp);
if (!double.IsNaN(orbit2.inclination) && !double.IsNaN(orbit2.eccentricity) && !double.IsNaN(orbit2.semiMajorAxis) && orbit2.timeToAp > TimeWarp.fixedDeltaTime) {
vessel.orbit.inclination = orbit2.inclination;
vessel.orbit.eccentricity = orbit2.eccentricity;
vessel.orbit.semiMajorAxis = orbit2.semiMajorAxis;
vessel.orbit.LAN = orbit2.LAN;
vessel.orbit.argumentOfPeriapsis = orbit2.argumentOfPeriapsis;
vessel.orbit.meanAnomalyAtEpoch = orbit2.meanAnomalyAtEpoch;
vessel.orbit.epoch = orbit2.epoch;
vessel.orbit.referenceBody = orbit2.referenceBody;
vessel.orbit.Init();
//vessel.orbit.UpdateFromOrbitAtUT(orbit2, Planetarium.GetUniversalTime(), orbit2.referenceBody);
vessel.orbit.UpdateFromUT(Planetarium.GetUniversalTime());
}
}
}
solar_force_d = solarForce.magnitude;
solar_acc_d = solar_accel.magnitude / TimeWarp.fixedDeltaTime;
//print(solarForce.x.ToString() + ", " + solarForce.y.ToString() + ", " + solarForce.z.ToString());
}
count++;
}
private Vector3d CalculateSolarForce() {
if (this.part != null) {
Vector3d sunPosition = FlightGlobals.fetch.bodies[0].position;
Vector3d ownPosition = this.part.transform.position;
Vector3d normal = this.part.transform.up;
if (surfaceTransform != null) {
normal = surfaceTransform.forward;
}
Vector3d force = normal * Vector3d.Dot((ownPosition - sunPosition).normalized, normal);
return force * surfaceArea * reflectedPhotonRatio * solarForceAtDistance();
} else {
return Vector3d.zero;
}
}
private double solarForceAtDistance() {
double distance_from_sun = Vector3.Distance(FlightGlobals.Bodies[PluginHelper.REF_BODY_KERBOL].transform.position, vessel.transform.position);
double force_to_return = thrust_coeff * kerbin_distance * kerbin_distance / distance_from_sun / distance_from_sun;
return force_to_return;
}
}
}