vec2i operator*(const int k, const vec2i& v1){ return vec2i(v1.peekx()*k, v1.peeky()*k); }
int dot(const vec2i& v1, const vec2i& v2){ return ((v1.peekx()*v2.peekx())+ (v1.peeky()*v2.peeky())); }
vec2i operator-(const vec2i& v1, const vec2i &v2){ return vec2i(v1.peekx()-v2.peekx(), v1.peeky()-v2.peeky()); }