X-Git-Url: http://git.treefish.org/~alex/seamulator.git/blobdiff_plain/ce5cb9e3b065ec3eabd2ffa79923043fdfb2087a..40fe15ee6190427f3bbc5db4ff640442626cc3bb:/sea.cpp?ds=sidebyside

diff --git a/sea.cpp b/sea.cpp
deleted file mode 100644
index 85191d4..0000000
--- a/sea.cpp
+++ /dev/null
@@ -1,135 +0,0 @@
-#include "sea.h"
-
-#include <cmath>
-#include <cstdlib>
-#include <iostream>
-
-#include "watersurface.h"
-
-const double Sea::PHILLIPS_CONSTANT{0.0000001};
-const double Sea::GRAVITATIONAL_CONSTANT{9.8};
-
-Sea::Sea(WaterSurfacePtr surface) :
-  m_surface{surface},
-  m_windDirection{1, 0},
-  m_windSpeed{10},
-  m_randomGenerator{m_randomDevice()},
-  m_normalDistribution{0.0, 1.0}
-{
-  m_fourierAmplitudes.resize(pow(m_surface->size() + 1, 2));
-  generateFourierAmplitudes();
-
-  m_fftwIn = (fftw_complex*)
-    fftw_malloc(sizeof(fftw_complex) * pow(m_surface->size(), 2));
-  m_fftwOut = (fftw_complex*)
-    fftw_malloc(sizeof(fftw_complex) * pow(m_surface->size(), 2));
-  m_fftwPlan = fftw_plan_dft_2d
-    (m_surface->size(), m_surface->size(), m_fftwIn, m_fftwOut,
-     FFTW_BACKWARD, FFTW_MEASURE);
-
-  m_startTime = std::chrono::system_clock::now();
-}
-
-Sea::~Sea()
-{
-  fftw_destroy_plan(m_fftwPlan);
-  fftw_free(m_fftwIn); fftw_free(m_fftwOut);
-}
-
-double Sea::getRuntime() const
-{
-  auto timeNow = std::chrono::system_clock::now();
-  auto durationMs =
-    std::chrono::duration_cast<std::chrono::milliseconds>(timeNow - m_startTime);
-
-  return durationMs.count() / 1000.0;
-}
-
-void Sea::update()
-{
-  using namespace std::complex_literals;
-
-  const double runtime = getRuntime();
-
-  for (int m = -m_surface->size()/2; m < m_surface->size()/2; ++m) {
-    const int positiveM = (m + m_surface->size()) % m_surface->size();
-
-    for (int n = -m_surface->size()/2; n < m_surface->size()/2; ++n) {
-      const double k = sqrt(pow(spatialFrequencyForIndex(n), 2) +
-			    pow(spatialFrequencyForIndex(m), 2));
-      const double omega = sqrt(GRAVITATIONAL_CONSTANT * k);
-
-      std::complex<double> amplitude =
-       	fourierAmplitudeAt(n, m) * exp(1i * omega * runtime) +
-       	std::conj(fourierAmplitudeAt(-n, -m)) * exp(-1i * omega * runtime);
-
-      const int positiveN = (n + m_surface->size()) % m_surface->size();
-      int fftwIndex = positiveM + positiveN * m_surface->size();
-
-      m_fftwIn[fftwIndex][0] = std::real(amplitude);
-      m_fftwIn[fftwIndex][1] = std::imag(amplitude);
-    }
-  }
-
-  fftw_execute(m_fftwPlan);
-
-  for (int y = 0; y < m_surface->size(); ++y) {
-    for (int x = 0; x < m_surface->size(); ++x) {
-      m_surface->at(x, y)
-	.setHeight(m_fftwOut[y + x * m_surface->size()][0]);
-    }
-  }
-}
-
-double Sea::phillipsSpectrum(double k_x, double k_y) const
-{
-  const double k = sqrt(pow(k_x, 2) + pow(k_y, 2));
-  const double L = pow(m_windSpeed, 2) / GRAVITATIONAL_CONSTANT;
-
-  const double cosineFactor = pow((k_x / k) * m_windDirection[0] +
-				  (k_y / k) * m_windDirection[1], 2);
-
-  return PHILLIPS_CONSTANT * exp(-1 / pow(k * L, 2)) / pow(k, 4) *
-    cosineFactor;
-}
-
-std::complex<double>& Sea::fourierAmplitudeAt(int n, int m)
-{
-  return m_fourierAmplitudes.at
-    (n + m_surface->size()/2 +
-     (m + m_surface->size()/2) * m_surface->size());
-}
-
-double Sea::spatialFrequencyForIndex(int n) const
-{
-  return 2 * M_PI * n / m_surface->size();
-}
-
-void Sea::generateFourierAmplitudes()
-{
-  for (int m = -m_surface->size()/2; m < m_surface->size()/2; ++m) {
-    const double k_y = spatialFrequencyForIndex(m);
-
-    for (int n = -m_surface->size()/2; n < m_surface->size()/2; ++n) {
-      const double k_x = spatialFrequencyForIndex(n);
-
-      std::complex<double> cDist(m_normalDistribution(m_randomGenerator),
-				 m_normalDistribution(m_randomGenerator));
-
-      fourierAmplitudeAt(n, m) =
-	cDist * sqrt(phillipsSpectrum(k_x, k_y)) / sqrt(2);
-    }
-  }
-
-  for (int n = -m_surface->size()/2; n < m_surface->size()/2; ++n) {
-    fourierAmplitudeAt(n, m_surface->size()/2) =
-      fourierAmplitudeAt(n, -m_surface->size()/2);
-  }
-
-  for (int m = -m_surface->size()/2; m < m_surface->size()/2; ++m) {
-    fourierAmplitudeAt(m_surface->size()/2, m) =
-      fourierAmplitudeAt(-m_surface->size()/2, m);
-  }
-
-  fourierAmplitudeAt(0, 0) = {0, 0};
-}