hell yea

forces.hpp

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+#pragma once
+#include "board.hpp"
+#include "pedestrian.hpp"
+#include <cmath>
+
+// $\tau_{\alpha}$
+// https://arxiv.org/pdf/cond-mat/9805244, page 8
+const double tau_alpha = 0.5;
+
+// $V^0_{\alpha \beta}$
+// https://arxiv.org/pdf/cond-mat/9805244, page 8
+const double V0_AB = 2.1;
+
+// $\sigma$
+// https://arxiv.org/pdf/cond-mat/9805244, page 8
+const double SIGMA = 0.3;
+
+// $U^0_{\alpha B}$
+// https://arxiv.org/pdf/cond-mat/9805244, page 8
+const double U0_AB = 10.0;
+
+// $R$
+// https://arxiv.org/pdf/cond-mat/9805244, page 8
+const double R = 0.2;
+
+// $c$
+// https://arxiv.org/pdf/cond-mat/9805244, page 8
+const double c = 0.5;
+
+// $\varphi$
+// https://arxiv.org/pdf/cond-mat/9805244, page 8
+const double phi = 100.0;
+
+const double cos_phi = cos(phi);
+
+// $\varDelta_{t}$
+// step size = 0.2 seconds
+// https://arxiv.org/pdf/cond-mat/9805244, page 8
+const double delta_t = 2;
+
+// # Optional (forces.cpp: compute_repulsive_effects_from_pedestrians)
+// const double DISTANCE = 2.0;
+
+double w(Vector2d e, Vector2d f);
+
+void compute_acceleration_term(Pedestrian *p);
+
+void compute_repulsive_effects_from_pedestrians(Pedestrian *P, Pedestrian *p, int N);
+
+void compute_repulsive_effects_from_borders(Board &B, Pedestrian *p);