32 lines
862 B
C++
32 lines
862 B
C++
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//
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// Created by dominik on 8/12/24.
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//
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#include <cmath>
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#include <random>
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#include "base.h"
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Motion::Motion(const double delta, const double eta, std::mt19937_64& rng) : m_delta(delta), m_eta(eta), m_rng(rng) {
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m_uni_dist = std::uniform_real_distribution(0., 1.);
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}
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Motion::Motion(std::mt19937_64& rng) : m_rng(rng) {
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m_uni_dist = std::uniform_real_distribution(0., 1.);
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}
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double Motion::omega_q(const double cos_theta, const double phi) const {
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const double cos_theta_square = cos_theta * cos_theta;
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const double sin_theta_square = 1. - cos_theta_square;
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return M_PI * m_delta * (3 * cos_theta_square - 1 - m_eta * sin_theta_square * cos(2.*phi));
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}
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double Motion::draw_position() {
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const double cos_theta = 1 - 2 * m_uni_dist(m_rng);
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const double phi = 2.0 * M_PI * m_uni_dist(m_rng);
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return omega_q(cos_theta, phi);
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}
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