/// <summary>
/// Worker method.
/// </summary>
protected override void WorkerMethod()
{
string[] vtkFiles = Directory.GetFiles(m_inputDir, "*.vtk");
if ((vtkFiles == null) || (vtkFiles.Length == 0))
{
return;
}
m_outputDir = CreateOutputDir(m_inputDir);
string paramsFile = Path.Combine(m_inputDir, "Params.txt");
if (File.Exists(paramsFile))
{
File.Copy(paramsFile, Path.Combine(m_outputDir, Path.GetFileName(paramsFile)));
}
m_numFilesToProcess = vtkFiles.Length;
int chunkSize = Environment.ProcessorCount;
for (int iStart = 0; iStart < m_numFilesToProcess; iStart += chunkSize)
{
int iEnd = Math.Min(iStart + chunkSize, m_numFilesToProcess);
Parallel.For(iStart, iEnd, i =>
{
// Crop one file, and save the result
string inputFile = vtkFiles[i];
ProbabilityDensity[] probs = ProbabilityDensity.ReadFromVtkFile(inputFile);
probs[0] = Crop(probs[0], m_xminCrop, m_xmaxCrop, m_yminCrop, m_ymaxCrop);
probs[1] = Crop(probs[1], m_xminCrop, m_xmaxCrop, m_yminCrop, m_ymaxCrop);
string outFile = Path.Combine(m_outputDir, Path.GetFileName(inputFile));
ProbabilityDensity.SaveToVtkFile(probs, outFile);
});
// Report progress to the caller
m_currentFileIndex = iEnd - 1;
ReportProgress();
if (IsCancelled)
{
return;
}
}
}
/// <summary>
/// Saves the current probability densities to a vtk file.
/// </summary>
private void SaveOutputFile(string fileSpec)
{
float time = m_currentTimeStepIndex * m_deltaT;
ProbabilityDensity prob1 = GetSingleParticleProbability(1, time);
if (prob1 == null)
{
return;
}
System.Diagnostics.Trace.WriteLine(prob1.Norm().ToString());
ProbabilityDensity prob2 = GetSingleParticleProbability(2, time);
if (prob2 == null)
{
return;
}
System.Diagnostics.Trace.WriteLine(" " + prob2.Norm().ToString());
ProbabilityDensity.SaveToVtkFile(new ProbabilityDensity[] { prob1, prob2 }, fileSpec);
}
/// <summary>
/// Reads density values from a vtk stream.
/// </summary>
private static ProbabilityDensity FromVtkStream(BinaryReader br, int sizeX, int sizeY, float latticeSpacing)
{
ProbabilityDensity result = new ProbabilityDensity(sizeX, sizeY, latticeSpacing);
unsafe
{
// For performance, we keep a temporary float value with pointers to its bytes
float floatVal = 0.0f;
byte *floatBytes0 = (byte *)(&floatVal);
byte *floatBytes1 = floatBytes0 + 1;
byte *floatBytes2 = floatBytes0 + 2;
byte *floatBytes3 = floatBytes0 + 3;
// Read the density values
ReadTextLine(br);
ReadTextLine(br);
byte[] bytePlane = br.ReadBytes(sizeX * sizeY * 4);
int n = 0;
for (int y = 0; y < sizeY; y++)
{
float[] dataY = result.Data[y];
for (int x = 0; x < sizeX; x++)
{
*floatBytes3 = bytePlane[n];
*floatBytes2 = bytePlane[n + 1];
*floatBytes1 = bytePlane[n + 2];
*floatBytes0 = bytePlane[n + 3];
dataY[x] = floatVal;
n += 4;
}
}
}
return(result);
}
/// <summary>
/// Crops a wavefunction.
/// </summary>
public static ProbabilityDensity Crop(ProbabilityDensity inputDensity, int xminCrop, int xmaxCrop, int yminCrop, int ymaxCrop)
{
float[][] modData = Crop(inputDensity.Data, xminCrop, xmaxCrop, yminCrop, ymaxCrop);
return(new ProbabilityDensity(modData, inputDensity.LatticeSpacing));
}
/// <summary>
/// Computes a single particle probability density by integrating over one of the particle coordinates.
/// </summary>
private ProbabilityDensity GetSingleParticleProbability(int particleIndex, double time)
{
int psx = m_gridSizeX;
int psy = m_gridSizeY;
// Precompute some constants we'll need
double fm1 = m_mass1 / m_totalMass;
double fm2 = m_mass2 / m_totalMass;
double sigmaCmFactorX = Math.Pow(m_sigmaCm.X, 4) + (time * time) / (m_totalMass * m_totalMass);
double sigmaCmFactorY = Math.Pow(m_sigmaCm.Y, 4) + (time * time) / (m_totalMass * m_totalMass);
double RnormX = m_sigmaCm.X / Math.Sqrt(Math.PI * sigmaCmFactorX);
double RnormY = m_sigmaCm.Y / Math.Sqrt(Math.PI * sigmaCmFactorY);
Vec2 R0 = fm1 * m_initialPosition1 + fm2 * m_initialPosition2;
Vec2 P0 = (m_initialMomentum1 + m_initialMomentum2);
double RxOffset = R0.X + time * (P0.X / m_totalMass);
double RyOffset = R0.Y + time * (P0.Y / m_totalMass);
double RxScale = -(m_sigmaCm.X * m_sigmaCm.X) / sigmaCmFactorX;
double RyScale = -(m_sigmaCm.Y * m_sigmaCm.Y) / sigmaCmFactorY;
// Precompute the relative wavefunction probabilities
ProbabilityDensity relDensity = m_visscherWf.ToRegularWavefunction().GetProbabilityDensity();
// Get a one-particle probability by marginalizing over the joint probability
float[][] oneParticleProbs = TdseUtils.Misc.Allocate2DArray(psy, psx);
if (particleIndex == 1)
{
for (int y1 = 0; y1 < psy; y1++)
{
// Precompute the center-of-mass wavefunction probabilities
float[] YExp = new float[psy];
for (int y2 = 0; y2 < psy; y2++)
{
double RyArg = (fm1 * y1 + fm2 * y2) * m_latticeSpacing - RyOffset;
YExp[y2] = (float)(RnormY * Math.Exp(RyScale * RyArg * RyArg));
}
TdseUtils.Misc.ForLoop(0, psx, x1 =>
{
float[] XExp = new float[psx];
for (int x2 = 0; x2 < psx; x2++)
{
double RxArg = (fm1 * x1 + fm2 * x2) * m_latticeSpacing - RxOffset;
XExp[x2] = (float)(RnormX * Math.Exp(RxScale * RxArg * RxArg));
}
float prob = 0.0f;
for (int y2 = 0; y2 < psy; y2++)
{
float[] relProbsY = relDensity.Data[(y1 - y2) + psy - 1];
int xOffset = x1 + psx - 1;
float sum = 0.0f;
for (int x2 = 0; x2 < psx; x2++)
{
sum += XExp[x2] * relProbsY[xOffset - x2];
}
prob += sum * YExp[y2];
}
oneParticleProbs[y1][x1] = prob * (m_latticeSpacing * m_latticeSpacing);
}, m_multiThread);
CheckForPause();
if (IsCancelled)
{
return(null);
}
}
}
else
{
for (int y2 = 0; y2 < psy; y2++)
{
// Precompute the center-of-mass wavefunction probabilities
float[] YExp = new float[psy];
for (int y1 = 0; y1 < psy; y1++)
{
double RyArg = (fm1 * y1 + fm2 * y2) * m_latticeSpacing - RyOffset;
YExp[y1] = (float)(RnormY * Math.Exp(RyScale * RyArg * RyArg));
}
TdseUtils.Misc.ForLoop(0, psx, x2 =>
{
float[] XExp = new float[psx];
for (int x1 = 0; x1 < psx; x1++)
{
double RxArg = (fm1 * x1 + fm2 * x2) * m_latticeSpacing - RxOffset;
XExp[x1] = (float)(RnormX * Math.Exp(RxScale * RxArg * RxArg));
}
float prob = 0.0f;
for (int y1 = 0; y1 < psy; y1++)
{
float[] relProbsY = relDensity.Data[(y1 - y2) + psy - 1];
int xOffset = -x2 + psx - 1;
float sum = 0.0f;
for (int x1 = 0; x1 < psx; x1++)
{
sum += XExp[x1] * relProbsY[x1 + xOffset];
}
prob += sum * YExp[y1];
}
oneParticleProbs[y2][x2] = prob * (m_latticeSpacing * m_latticeSpacing);
}, m_multiThread);
CheckForPause();
if (IsCancelled)
{
return(null);
}
}
}
return(new ProbabilityDensity(oneParticleProbs, m_visscherWf.LatticeSpacing));
}
