SpacyShooter/Physics/b2Angle.cpp

//
// Created by jovian on 31/07/17.
//

#include "b2Angle.h"


float b2Angle(const b2Vec2 &u, const b2Vec2 &v) {
    float rep(std::acos(b2Dot(u, v)));
    if ( b2Cross(u, v) > 0.0f )
        rep *= -1.0f;

    return rep;
}

float b2Angle(const b2Vec2 &u) {
    return b2Angle(u, b2Vec2(1.0f, 0.0f));
}

b2Vec2 b2Dir(const float angle) {
    return b2Vec2((float) cos(angle), (float) sin(angle));
}