added duplicated header files to a legacy order

We can delete that folder as soon as we are sure we dont need them

legacy_header_files/forces.h

@@ -0,0 +1,52 @@
+#pragma once
+#include <pedestrian.h>
+#include <sidewalk.h>
+
+// Params
+// TODO: change this
+// $\tau$
+const double TAU = 1.0; // time to reach desired speed in s
+
+// TODO: change this
+// $V^0_{\alpha \beta}$
+const double V0_AB = 2.1;
+
+// TODO: change this
+// $\sigma$
+const double SIGMA = 0.3;
+
+// TODO: change this
+// $U^0_{\alpha B}$
+const double U0_AB = 10.0;
+
+// TODO: change this
+// $R$
+const double R = 0.2;
+
+// TODO: change this
+// $C$
+const double C = 0.2;
+
+// TODO: change this
+// $\phi$
+// Field of view
+const double PHI_DEG = 200.0;
+
+// TODO: change this
+const double DISTANCE = 2.0;
+
+// Helper functions
+
+Vector2d get_desired_direction(Pedestrian &p);
+
+Vector2d get_actual_direction(Pedestrian &p);
+
+double w(Vector2d e, Vector2d f);
+
+// Force functions
+
+void compute_acceleration_term(Pedestrian *p);
+
+void compute_repulsive_effects_from_pedestrians(Pedestrian *P, Pedestrian *p, int N);
+
+void compute_repulsive_effects_from_borders(Sidewalk &S, Pedestrian *p);