added flexibility

src/motions/isosmallangle.cpp

@@ -0,0 +1,26 @@
+#include "isosmallangle.h"
+#include "coordinates.h"
+
+#include <iostream>
+
+
+
+SmallAngle::SmallAngle(const double delta, const double eta, const double chi, std::mt19937_64 &rng) :
+    Motion(std::string("IsotropicAngle"), delta, eta, rng), m_chi(chi * M_PI / 180.0) {};
+SmallAngle::SmallAngle(std::mt19937_64 &rng) : Motion(std::string("IsotropicAngle"), rng) {}
+
+void SmallAngle::initialize() {
+    m_prev_pos = draw_position();
+};
+
+double SmallAngle::jump() {
+    const double gamma{2 * M_PI * m_uni_dist(m_rng)};
+    m_prev_pos = rotate(m_prev_pos, m_chi, gamma);
+
+    return omega_q(m_prev_pos);
+}
+
+void SmallAngle::setParameters(const std::unordered_map<std::string, double> &parameters) {
+    m_chi = parameters.at("angle") * M_PI / 180.0;
+    Motion::setParameters(parameters);
+}