protected abstract Direction GetFinalDirection(Position position); // position may or may not be needed
private static Position GetFinalPositionFromProfileType(ISourceProfile sourceProfile, double innerRadius, double outerRadius, Random rng)
{
Position finalPosition = SourceDefaults.DefaultPosition.Clone();
switch (sourceProfile.SourceProfileType)
{
case SourceProfileType.Flat:
// var flatProfile = sourceProfile as FlatSourceProfile;
finalPosition = SourceToolbox.GetPositionInACircleRandomFlat(
SourceDefaults.DefaultPosition.Clone(),
innerRadius,
outerRadius,
rng);
break;
case SourceProfileType.Gaussian:
var gaussianProfile = sourceProfile as GaussianSourceProfile;
finalPosition = SourceToolbox.GetPositionInACircleRandomGaussian(
SourceDefaults.DefaultPosition.Clone(),
outerRadius,
innerRadius,
gaussianProfile.BeamDiaFWHM,
rng);
break;
}
return(finalPosition);
}
public void validate_static_method_getpositioninacirclerandomflat()
{
Random rng = new MathNet.Numerics.Random.MersenneTwister(0);
var pos = SourceToolbox.GetPositionInACircleRandomFlat(_position, _innerRadius, _outerRadius, rng);
Assert.Less(Math.Abs(pos.X - _tp[47]), ACCEPTABLE_PRECISION);
Assert.Less(Math.Abs(pos.Y - _tp[48]), ACCEPTABLE_PRECISION);
Assert.Less(Math.Abs(pos.Z - _tp[49]), ACCEPTABLE_PRECISION);
}
/// <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 = SourceToolbox.GetDirectionForGivenPolarAzimuthalAngleRangeRandom(
SourceDefaults.DefaultHalfPolarAngleRange.Clone(),
SourceDefaults.DefaultAzimuthalAngleRange.Clone(),
Rng);
Position finalPosition = SourceDefaults.DefaultPosition.Clone();
if (_fiberRadius > 0.0)
{
if (Rng.NextDouble() > bottom / (curved + bottom)) //Consider
{ /* Curved surface */
// To utilize the final direction given above, we can assume a tube
// parallel to the y-axis. We can rotate it about the x-axis by pi/2
// to compute the new direction.
SourceToolbox.UpdateDirectionAfterRotatingAroundXAxis(-0.5 * Math.PI, finalDirection);
//Sample tube perimeter first to compute x and y coordinates
finalPosition = SourceToolbox.GetPositionAtCirclePerimeter(finalPosition,
_fiberRadius,
Rng);
//Sample tube height to compute z coordinate
finalPosition.Z = _fiberHeightZ * (Rng.NextDouble() - 0.5);
}
else
{ /* Bottom Surface */
//Shift finalPosition by _fiberHeightZ / 2
finalPosition = new Position(0.0, 0.0, _fiberHeightZ * 0.5);
//Sample the bottom face to find x, y coordinates of the emission
finalPosition = SourceToolbox.GetPositionInACircleRandomFlat(finalPosition,
0.0,
_fiberRadius,
Rng);
}
}
//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, 1.0, tissue, _initialTissueRegionIndex, Rng);
return photon;
}
protected abstract Direction GetFinalDirection(Position position); // position may or may not be needed
private static Position GetFinalPosition(double beamDiameterFWHM, double innerRadius, double outerRadius, Random rng)
{
return(beamDiameterFWHM < 0.0
? SourceToolbox.GetPositionInACircleRandomFlat(
SourceDefaults.DefaultPosition.Clone(),
innerRadius,
outerRadius,
rng)
: SourceToolbox.GetPositionInACircleRandomGaussian(
SourceDefaults.DefaultPosition.Clone(),
outerRadius,
innerRadius,
beamDiameterFWHM,
rng));
}
/// <summary>
/// Returns direction for a given position
/// </summary>
/// <param name="position">position</param>
/// <returns>new direction</returns>
protected override Direction GetFinalDirection(Position position)
{
// randomly sample length of flat circle in air
var positionInAir = SourceToolbox.GetPositionInACircleRandomFlat(
_circleInAirTranslationFromOrigin, 0.0, _radiusInAir, Rng);
// determine angle from positionInAir to PointLocation on tissue
var dist = Math.Sqrt(
(positionInAir.X - position.X) * (positionInAir.X - position.X) +
(positionInAir.Y - position.Y) * (positionInAir.Y - position.Y) +
(positionInAir.Z - position.Z) * (positionInAir.Z - position.Z));
return(new Direction(
(position.X - positionInAir.X) / dist,
(position.Y - positionInAir.Y) / dist,
(position.Z - positionInAir.Z) / dist));
}
/// <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);
}