protected abstract Direction GetFinalDirection(Position position); // position may or may not be needed
private static Position GetFinalPositionFromProfileType(ISourceProfile sourceProfile, double lineLength, Random rng)
{
Position finalPosition = SourceDefaults.DefaultPosition.Clone();
switch (sourceProfile.SourceProfileType)
{
case SourceProfileType.Flat:
// var flatProfile = sourceProfile as FlatSourceProfile;
finalPosition = SourceToolbox.GetPositionInALineRandomFlat(
finalPosition,
lineLength,
rng);
break;
case SourceProfileType.Gaussian:
var gaussianProfile = sourceProfile as GaussianSourceProfile;
finalPosition = SourceToolbox.GetPositionInALineRandomGaussian(
finalPosition,
0.5 * lineLength,
gaussianProfile.BeamDiaFWHM,
rng);
break;
}
return(finalPosition);
}
public void validate_static_method_getpositioninalinerandomflat()
{
Random rng = new MathNet.Numerics.Random.MersenneTwister(0);
var pos = SourceToolbox.GetPositionInALineRandomFlat(_position, _lengthX, rng);
Assert.Less(Math.Abs(pos.X - _tp[59]), ACCEPTABLE_PRECISION);
Assert.Less(Math.Abs(pos.Y - _tp[60]), ACCEPTABLE_PRECISION);
Assert.Less(Math.Abs(pos.Z - _tp[61]), ACCEPTABLE_PRECISION);
}
protected abstract Direction GetFinalDirection(Position position); // position may or may not be needed
private static Position GetFinalPosition(double beamDiameterFWHM, double lineLength, Random rng)
{
Position finalPosition = SourceDefaults.DefaultPosition.Clone();
return(beamDiameterFWHM < 0.0
? SourceToolbox.GetPositionInALineRandomFlat(
finalPosition,
lineLength,
rng)
: SourceToolbox.GetPositionInALineRandomGaussian(
finalPosition,
0.5 * lineLength,
beamDiameterFWHM,
rng));
}
/// <summary>
/// Implements Get next photon
/// </summary>
/// <param name="tissue">tissue</param>
/// <returns>photon</returns>
public Photon GetNextPhoton(ITissue tissue)
{
double curved = 2 * Math.PI * _fiberRadius * _fiberHeightZ * _curvedSurfaceEfficiency;
double bottom = Math.PI * _fiberRadius * _fiberRadius * _bottomSurfaceEfficiency;
Direction finalDirection;
Position finalPosition;
if (_fiberRadius > 0.0)
{
if (Rng.NextDouble() > bottom / (curved + bottom))
{
//sample angular distribution
finalDirection = SourceToolbox.GetDirectionForGivenPolarAzimuthalAngleRangeRandom(
SourceDefaults.DefaultHalfPolarAngleRange.Clone(),
SourceDefaults.DefaultAzimuthalAngleRange.Clone(),
Rng);
//Translate the photon to _tubeRadius length below the origin. Ring lies on yz plane.
finalPosition = new Position(0.0, 0.0, _fiberRadius);
//Sample a ring that emits photons outside.
SourceToolbox.UpdateDirectionPositionAfterRotatingAroundXAxis(
2.0 * Math.PI * Rng.NextDouble(),
ref finalDirection,
ref finalPosition);
//Ring lies on xy plane. z= 0;
SourceToolbox.UpdateDirectionPositionAfterRotatingAroundYAxis(
0.5 * Math.PI,
ref finalDirection,
ref finalPosition);
//Sample tube height
finalPosition.Z = _fiberHeightZ * (2.0 * Rng.NextDouble() - 1.0);
}
else
{
finalPosition = SourceToolbox.GetPositionInACircleRandomFlat(
SourceDefaults.DefaultPosition.Clone(),
0.0,
_fiberRadius,
Rng);
finalDirection = SourceToolbox.GetDirectionForGivenPolarAzimuthalAngleRangeRandom(
SourceDefaults.DefaultHalfPolarAngleRange.Clone(),
SourceDefaults.DefaultAzimuthalAngleRange.Clone(),
Rng);
}
}
else
{
finalPosition = SourceToolbox.GetPositionInALineRandomFlat(
SourceDefaults.DefaultPosition.Clone(),
_fiberHeightZ,
Rng);
finalDirection = SourceToolbox.GetDirectionForGivenPolarAzimuthalAngleRangeRandom(
SourceDefaults.DefaultFullPolarAngleRange.Clone(),
SourceDefaults.DefaultAzimuthalAngleRange.Clone(),
Rng);
//Rotate 90degrees around y axis
SourceToolbox.UpdateDirectionPositionAfterRotatingAroundYAxis(
0.5 * Math.PI,
ref finalDirection,
ref finalPosition);
}
//Find the relevent polar and azimuthal pair for the direction
PolarAzimuthalAngles _rotationalAnglesOfPrincipalSourceAxis = SourceToolbox.GetPolarAzimuthalPairFromDirection(_newDirectionOfPrincipalSourceAxis);
//Translation and source rotation
SourceToolbox.UpdateDirectionPositionAfterGivenFlags(
ref finalPosition,
ref finalDirection,
_rotationalAnglesOfPrincipalSourceAxis,
_translationFromOrigin,
_rotationAndTranslationFlags);
var photon = new Photon(finalPosition, finalDirection, tissue, _initialTissueRegionIndex, Rng);
return(photon);
}