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#ifndef VEC_H
#define VEC_H
#include <cassert>
#include <cmath>
#include <iostream>
#include "util.h"
// Defines a thin wrapper around fixed size C-style arrays, using template parameters,
// which is useful for dealing with vectors of different dimensions.
// For example, float[3] is equivalent to Vec<3,float>.
// Entries in the vector are accessed with the overloaded [] operator, so
// for example if x is a Vec<3,float>, then the middle entry is x[1].
// For convenience, there are a number of typedefs for abbreviation:
// Vec<3,float> -> Vec3f
// Vec<2,int> -> Vec2i
// and so on.
// Arithmetic operators are appropriately overloaded, and functions are defined
// for additional operations (such as dot-products, norms, cross-products, etc.)
template<unsigned int N, class T>
struct Vec
{
T v[N];
Vec<N,T>(void)
{}
Vec<N,T>(T value_for_all)
{ for(unsigned int i=0; i<N; ++i) v[i]=value_for_all; }
template<class S>
Vec<N,T>(const S *source)
{ for(unsigned int i=0; i<N; ++i) v[i]=(T)source[i]; }
template <class S>
explicit Vec<N,T>(const Vec<N,S>& source)
{ for(unsigned int i=0; i<N; ++i) v[i]=(T)source[i]; }
Vec<N,T>(T v0, T v1)
{
assert(N==2);
v[0]=v0; v[1]=v1;
}
Vec<N,T>(T v0, T v1, T v2)
{
assert(N==3);
v[0]=v0; v[1]=v1; v[2]=v2;
}
Vec<N,T>(T v0, T v1, T v2, T v3)
{
assert(N==4);
v[0]=v0; v[1]=v1; v[2]=v2; v[3]=v3;
}
Vec<N,T>(T v0, T v1, T v2, T v3, T v4)
{
assert(N==5);
v[0]=v0; v[1]=v1; v[2]=v2; v[3]=v3; v[4]=v4;
}
Vec<N,T>(T v0, T v1, T v2, T v3, T v4, T v5)
{
assert(N==6);
v[0]=v0; v[1]=v1; v[2]=v2; v[3]=v3; v[4]=v4; v[5]=v5;
}
T &operator[](int index)
{
assert(0<=index && (unsigned int)index<N);
return v[index];
}
const T &operator[](int index) const
{
assert(0<=index && (unsigned int)index<N);
return v[index];
}
operator bool(void) const
{
for(unsigned int i=0; i<N; ++i) if(v[i]) return true;
return false;
}
Vec<N,T> operator+=(const Vec<N,T> &w)
{
for(unsigned int i=0; i<N; ++i) v[i]+=w[i];
return *this;
}
Vec<N,T> operator+(const Vec<N,T> &w) const
{
Vec<N,T> sum(*this);
sum+=w;
return sum;
}
Vec<N,T> operator-=(const Vec<N,T> &w)
{
for(unsigned int i=0; i<N; ++i) v[i]-=w[i];
return *this;
}
Vec<N,T> operator-(void) const // unary minus
{
Vec<N,T> negative;
for(unsigned int i=0; i<N; ++i) negative.v[i]=-v[i];
return negative;
}
Vec<N,T> operator-(const Vec<N,T> &w) const // (binary) subtraction
{
Vec<N,T> diff(*this);
diff-=w;
return diff;
}
Vec<N,T> operator*=(T a)
{
for(unsigned int i=0; i<N; ++i) v[i]*=a;
return *this;
}
Vec<N,T> operator*(T a) const
{
Vec<N,T> w(*this);
w*=a;
return w;
}
Vec<N,T> operator*(const Vec<N,T> &w) const
{
Vec<N,T> componentwise_product;
for(unsigned int i=0; i<N; ++i) componentwise_product[i]=v[i]*w.v[i];
return componentwise_product;
}
Vec<N,T> operator/=(T a)
{
for(unsigned int i=0; i<N; ++i) v[i]/=a;
return *this;
}
Vec<N,T> operator/(T a) const
{
Vec<N,T> w(*this);
w/=a;
return w;
}
};
typedef Vec<2,double> Vec2d;
typedef Vec<2,float> Vec2f;
typedef Vec<2,int> Vec2i;
typedef Vec<2,unsigned int> Vec2ui;
typedef Vec<2,short> Vec2s;
typedef Vec<2,unsigned short> Vec2us;
typedef Vec<2,char> Vec2c;
typedef Vec<2,unsigned char> Vec2uc;
typedef Vec<3,double> Vec3d;
typedef Vec<3,float> Vec3f;
typedef Vec<3,int> Vec3i;
typedef Vec<3,unsigned int> Vec3ui;
typedef Vec<3,short> Vec3s;
typedef Vec<3,unsigned short> Vec3us;
typedef Vec<3,char> Vec3c;
typedef Vec<3,unsigned char> Vec3uc;
typedef Vec<4,double> Vec4d;
typedef Vec<4,float> Vec4f;
typedef Vec<4,int> Vec4i;
typedef Vec<4,unsigned int> Vec4ui;
typedef Vec<4,short> Vec4s;
typedef Vec<4,unsigned short> Vec4us;
typedef Vec<4,char> Vec4c;
typedef Vec<4,unsigned char> Vec4uc;
typedef Vec<6,double> Vec6d;
typedef Vec<6,float> Vec6f;
typedef Vec<6,unsigned int> Vec6ui;
typedef Vec<6,int> Vec6i;
typedef Vec<6,short> Vec6s;
typedef Vec<6,unsigned short> Vec6us;
typedef Vec<6,char> Vec6c;
typedef Vec<6,unsigned char> Vec6uc;
template<unsigned int N, class T>
T mag2(const Vec<N,T> &a)
{
T l=sqr(a.v[0]);
for(unsigned int i=1; i<N; ++i) l+=sqr(a.v[i]);
return l;
}
template<unsigned int N, class T>
T mag(const Vec<N,T> &a)
{ return sqrt(mag2(a)); }
template<unsigned int N, class T>
inline T dist2(const Vec<N,T> &a, const Vec<N,T> &b)
{
T d=sqr(a.v[0]-b.v[0]);
for(unsigned int i=1; i<N; ++i) d+=sqr(a.v[i]-b.v[i]);
return d;
}
template<unsigned int N, class T>
inline T dist(const Vec<N,T> &a, const Vec<N,T> &b)
{ return std::sqrt(dist2(a,b)); }
template<unsigned int N, class T>
inline void normalize(Vec<N,T> &a)
{ a/=mag(a); }
template<unsigned int N, class T>
inline Vec<N,T> normalized(const Vec<N,T> &a)
{ return a/mag(a); }
template<unsigned int N, class T>
inline T infnorm(const Vec<N,T> &a)
{
T d=std::fabs(a.v[0]);
for(unsigned int i=1; i<N; ++i) d=max(std::fabs(a.v[i]),d);
return d;
}
template<unsigned int N, class T>
void zero(Vec<N,T> &a)
{
for(unsigned int i=0; i<N; ++i)
a.v[i] = 0;
}
template<unsigned int N, class T>
std::ostream &operator<<(std::ostream &out, const Vec<N,T> &v)
{
out<<v.v[0];
for(unsigned int i=1; i<N; ++i)
out<<' '<<v.v[i];
return out;
}
template<unsigned int N, class T>
std::istream &operator>>(std::istream &in, Vec<N,T> &v)
{
in>>v.v[0];
for(unsigned int i=1; i<N; ++i)
in>>v.v[i];
return in;
}
template<unsigned int N, class T>
inline bool operator==(const Vec<N,T> &a, const Vec<N,T> &b)
{
bool t = (a.v[0] == b.v[0]);
unsigned int i=1;
while(i<N && t) {
t = t && (a.v[i]==b.v[i]);
++i;
}
return t;
}
template<unsigned int N, class T>
inline bool operator!=(const Vec<N,T> &a, const Vec<N,T> &b)
{
bool t = (a.v[0] != b.v[0]);
unsigned int i=1;
while(i<N && !t) {
t = t || (a.v[i]!=b.v[i]);
++i;
}
return t;
}
template<unsigned int N, class T>
inline Vec<N,T> operator*(T a, const Vec<N,T> &v)
{
Vec<N,T> w(v);
w*=a;
return w;
}
template<unsigned int N, class T>
inline T min(const Vec<N,T> &a)
{
T m=a.v[0];
for(unsigned int i=1; i<N; ++i) if(a.v[i]<m) m=a.v[i];
return m;
}
template<unsigned int N, class T>
inline Vec<N,T> min_union(const Vec<N,T> &a, const Vec<N,T> &b)
{
Vec<N,T> m;
for(unsigned int i=0; i<N; ++i) (a.v[i] < b.v[i]) ? m.v[i]=a.v[i] : m.v[i]=b.v[i];
return m;
}
template<unsigned int N, class T>
inline Vec<N,T> max_union(const Vec<N,T> &a, const Vec<N,T> &b)
{
Vec<N,T> m;
for(unsigned int i=0; i<N; ++i) (a.v[i] > b.v[i]) ? m.v[i]=a.v[i] : m.v[i]=b.v[i];
return m;
}
template<unsigned int N, class T>
inline T max(const Vec<N,T> &a)
{
T m=a.v[0];
for(unsigned int i=1; i<N; ++i) if(a.v[i]>m) m=a.v[i];
return m;
}
template<unsigned int N, class T>
inline T dot(const Vec<N,T> &a, const Vec<N,T> &b)
{
T d=a.v[0]*b.v[0];
for(unsigned int i=1; i<N; ++i) d+=a.v[i]*b.v[i];
return d;
}
template<class T>
inline Vec<2,T> rotate(const Vec<2,T>& a, float angle)
{
T c = cos(angle);
T s = sin(angle);
return Vec<2,T>(c*a[0] - s*a[1],s*a[0] + c*a[1]); // counter-clockwise rotation
}
template<class T>
inline Vec<2,T> perp(const Vec<2,T> &a)
{ return Vec<2,T>(-a.v[1], a.v[0]); } // counter-clockwise rotation by 90 degrees
template<class T>
inline T cross(const Vec<2,T> &a, const Vec<2,T> &b)
{ return a.v[0]*b.v[1]-a.v[1]*b.v[0]; }
template<class T>
inline Vec<3,T> cross(const Vec<3,T> &a, const Vec<3,T> &b)
{ return Vec<3,T>(a.v[1]*b.v[2]-a.v[2]*b.v[1], a.v[2]*b.v[0]-a.v[0]*b.v[2], a.v[0]*b.v[1]-a.v[1]*b.v[0]); }
template<class T>
inline T triple(const Vec<3,T> &a, const Vec<3,T> &b, const Vec<3,T> &c)
{ return a.v[0]*(b.v[1]*c.v[2]-b.v[2]*c.v[1])
+a.v[1]*(b.v[2]*c.v[0]-b.v[0]*c.v[2])
+a.v[2]*(b.v[0]*c.v[1]-b.v[1]*c.v[0]); }
template<unsigned int N, class T>
inline unsigned int hash(const Vec<N,T> &a)
{
unsigned int h=a.v[0];
for(unsigned int i=1; i<N; ++i)
h=hash(h ^ a.v[i]);
return h;
}
template<unsigned int N, class T>
inline void assign(const Vec<N,T> &a, T &a0, T &a1)
{
assert(N==2);
a0=a.v[0]; a1=a.v[1];
}
template<unsigned int N, class T>
inline void assign(const Vec<N,T> &a, T &a0, T &a1, T &a2)
{
assert(N==3);
a0=a.v[0]; a1=a.v[1]; a2=a.v[2];
}
template<unsigned int N, class T>
inline void assign(const Vec<N,T> &a, T &a0, T &a1, T &a2, T &a3)
{
assert(N==4);
a0=a.v[0]; a1=a.v[1]; a2=a.v[2]; a3=a.v[3];
}
template<unsigned int N, class T>
inline void assign(const Vec<N,T> &a, T &a0, T &a1, T &a2, T &a3, T &a4, T &a5)
{
assert(N==6);
a0=a.v[0]; a1=a.v[1]; a2=a.v[2]; a3=a.v[3]; a4=a.v[4]; a5=a.v[5];
}
template<unsigned int N, class T>
inline Vec<N,int> round(const Vec<N,T> &a)
{
Vec<N,int> rounded;
for(unsigned int i=0; i<N; ++i)
rounded.v[i]=lround(a.v[i]);
return rounded;
}
template<unsigned int N, class T>
inline Vec<N,int> floor(const Vec<N,T> &a)
{
Vec<N,int> rounded;
for(unsigned int i=0; i<N; ++i)
rounded.v[i]=(int)floor(a.v[i]);
return rounded;
}
template<unsigned int N, class T>
inline Vec<N,int> ceil(const Vec<N,T> &a)
{
Vec<N,int> rounded;
for(unsigned int i=0; i<N; ++i)
rounded.v[i]=(int)ceil(a.v[i]);
return rounded;
}
template<unsigned int N, class T>
inline Vec<N,T> fabs(const Vec<N,T> &a)
{
Vec<N,T> result;
for(unsigned int i=0; i<N; ++i)
result.v[i]=fabs(a.v[i]);
return result;
}
template<unsigned int N, class T>
inline void minmax(const Vec<N,T> &x0, const Vec<N,T> &x1, Vec<N,T> &xmin, Vec<N,T> &xmax)
{
for(unsigned int i=0; i<N; ++i)
minmax(x0.v[i], x1.v[i], xmin.v[i], xmax.v[i]);
}
template<unsigned int N, class T>
inline void minmax(const Vec<N,T> &x0, const Vec<N,T> &x1, const Vec<N,T> &x2, Vec<N,T> &xmin, Vec<N,T> &xmax)
{
for(unsigned int i=0; i<N; ++i)
minmax(x0.v[i], x1.v[i], x2.v[i], xmin.v[i], xmax.v[i]);
}
template<unsigned int N, class T>
inline void minmax(const Vec<N,T> &x0, const Vec<N,T> &x1, const Vec<N,T> &x2, const Vec<N,T> &x3,
Vec<N,T> &xmin, Vec<N,T> &xmax)
{
for(unsigned int i=0; i<N; ++i)
minmax(x0.v[i], x1.v[i], x2.v[i], x3.v[i], xmin.v[i], xmax.v[i]);
}
template<unsigned int N, class T>
inline void minmax(const Vec<N,T> &x0, const Vec<N,T> &x1, const Vec<N,T> &x2, const Vec<N,T> &x3, const Vec<N,T> &x4,
Vec<N,T> &xmin, Vec<N,T> &xmax)
{
for(unsigned int i=0; i<N; ++i)
minmax(x0.v[i], x1.v[i], x2.v[i], x3.v[i], x4.v[i], xmin.v[i], xmax.v[i]);
}
template<unsigned int N, class T>
inline void minmax(const Vec<N,T> &x0, const Vec<N,T> &x1, const Vec<N,T> &x2, const Vec<N,T> &x3, const Vec<N,T> &x4,
const Vec<N,T> &x5, Vec<N,T> &xmin, Vec<N,T> &xmax)
{
for(unsigned int i=0; i<N; ++i)
minmax(x0.v[i], x1.v[i], x2.v[i], x3.v[i], x4.v[i], x5.v[i], xmin.v[i], xmax.v[i]);
}
template<unsigned int N, class T>
inline void update_minmax(const Vec<N,T> &x, Vec<N,T> &xmin, Vec<N,T> &xmax)
{
for(unsigned int i=0; i<N; ++i) update_minmax(x[i], xmin[i], xmax[i]);
}
#endif
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