Removed unused stuff

charge/charge.c

@@ -75,10 +75,7 @@ double random_charge_q(bool positive) {
     return (rand() % 100) * (positive ? 1 : -1);
 }
 
-int sign(double a) { return (a < 0) ? -1 : 1; }
-
 vec2 electristatic_force(charge_t a, charge_t b) {
-    bool attractive = sign(a.q) != sign(b.q);
     vec2 rab = vec2_sub(b.pos, a.pos);
     vec2 res = vec2_mul(
         rab, -K * (((a.q * 10e-6) * (b.q * 10e-6)) / pow(vec2_norm(rab), 2)));
@@ -101,22 +98,14 @@ vec2 resulting_electrostatic_force(charge_t *charges, int num_charges,
     return resulting;
 }
 
-vec2 compute_initial_vecocity(charge_t c, charge_t *charges, int num_charges) {
-    double norm = 0;
-    double angle = rand() % 360;
-    return vec2_create(norm * cos(angle), norm * sin(angle));
-}
-
 vec2 compute_acceleration(charge_t c, charge_t *charges, int num_charges) {
     return vec2_mul(resulting_electrostatic_force(charges, num_charges, c),
                     1.0 / CHARGE_MASS);
 }
 
 vec2 compute_first_pos(charge_t c, charge_t *charges, int num_charges) {
-    vec2 velocity = compute_initial_vecocity(c, charges, num_charges);
     vec2 a = compute_acceleration(c, charges, num_charges);
-    vec2 pos = vec2_add(vec2_add(c.pos, vec2_mul(velocity, DELTA_T)),
-                        vec2_mul(a, pow(DELTA_T, 2) / 2));
+    vec2 pos = vec2_add(c.pos, vec2_mul(a, pow(DELTA_T, 2) / 2));
     return pos;
 }