public ApoapsisPeriapsisPrediction predictOrbit()
{
VesselController.setReferenceFrameType(VesselController.ReferenceFrameType.ClosestBodyCenter);
VesselController.updateBodyPosition();
var currentPosition = VesselController.getPosition();
var currentVelocity = VesselController.getVelocity();
float stepsize = 1.0f;
float time = 0.0f;
double min = 99999999990.0;
double max = 0.0;
double last = VesselController.getAltitudeAtPoint(currentPosition);
int direction = 0;
int changes = 0;
double timeToApo = 0.0;
double timeToPeri = 0.0;
while (true)
{
var gravity = VesselController.getGravityAtPoint(currentPosition);
var gravityLength = gravity.Length();
//Console.WriteLine(gravity.Length());
currentVelocity += gravity * stepsize;
currentPosition += currentVelocity * stepsize;
double newAltitude = VesselController.getAltitudeAtPoint(currentPosition);
time += stepsize;
if (newAltitude < min)
{
min = newAltitude;
timeToPeri = time;
}
if (newAltitude > max)
{
max = newAltitude;
timeToApo = time;
}
if (direction == 0)
{
direction = newAltitude < last ? -1 : 1;
changes++;
}
else if (direction == 1 && gravityLength < last)
{
changes++;
direction = -1;
}
else if (direction == -1 && gravityLength >= last)
{
changes++;
direction = 1;
}
last = last * 0.999 + 0.001 * gravityLength;
if (changes > 3)
{
break;
}
if (newAltitude < 0)
{
break;
}
}
VesselController.setReferenceFrameType(VesselController.ReferenceFrameType.ClosestBodySurface);
VesselController.updateBodyPosition();
return(new ApoapsisPeriapsisPrediction()
{
Apoapsis = max,
Periapsis = min,
TimeToApoapsis = timeToApo,
TimeToPeriapsis = timeToPeri
});
}
