67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
//
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// Created by dominik on 8/12/24.
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//
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#include <random>
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#include <cmath>
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#include "base.h"
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#include <stdexcept>
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#include <utility>
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#include "coordinates.h"
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#include "bimodalangle.h"
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#include "isosmallangle.h"
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#include "random.h"
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#include "tetrahedral.h"
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Motion::Motion(std::string name, const double delta, const double eta, std::mt19937_64& rng) : m_name(std::move(name)), 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::string name, std::mt19937_64& rng) : m_name(std::move(name)), 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 * std::cos(2.*phi));
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}
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double Motion::omega_q(const SphericalPos& pos) const {
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auto [cos_theta, phi] = pos;
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return omega_q(cos_theta, phi);
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}
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SphericalPos 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 {cos_theta, phi};
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}
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Motion* Motion::createFromInput(const std::string& input, std::mt19937_64& rng) {
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if (input == "TetrahedralJump")
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return new TetrahedralJump(rng);
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if (input == "IsotropicAngle")
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return new SmallAngle(rng);
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if (input == "RandomJump")
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return new RandomJump(rng);
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if (input == "BimodalAngle")
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return new BimodalAngle(rng);
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throw std::invalid_argument("Invalid input " + input);
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}
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std::ostream& operator<<(std::ostream& os, const Motion& m) {
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os << m.getName();
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return os;
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}
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