/usr/include/colib/vec2.h is in libiulib-dev 0.4+is+0.3-3ubuntu1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 | #ifndef h_vec2__
#define h_vec2__
// Copyright 2006 Deutsches Forschungszentrum fuer Kuenstliche Intelligenz
// or its licensors, as applicable.
// Copyright 1995-2005 Thomas M. Breuel
//
// You may not use this file except under the terms of the accompanying license.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you
// may not use this file except in compliance with the License. You may
// obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Project: iulib -- image understanding library
// File: vec2.h
// Purpose: 2D vectors
// Responsible: tmb
// Reviewer:
// Primary Repository:
// Web Sites: www.iupr.org, www.dfki.de
/// \file vec2.h
/// \brief 2D vectors
extern "C" {
#include <math.h>
}
namespace colib {
struct vec2 {
static inline void range(int i,int n) {
if(unsigned(i)>=unsigned(n)) throw "range error in vec2";
}
template <class T>
static inline T sqr(T x) {return x*x;}
template <class T>
static inline T min(T a,T b) { return a<b?a:b; }
template <class T>
static inline T max(T a,T b) { return a>b?a:b; }
enum {N=2};
float data[2];
explicit vec2(float v0=0,float v1=0) {
data[0] = v0;
data[1] = v1;
}
int length() const {
return N;
}
float at(int i) const {
range(i,N);
return data[i];
}
float operator()(int i) const {
range(i,N);
return data[i];
}
float &operator()(int i) {
range(i,N);
return data[i];
}
float operator[](int i) const {
range(i,N);
return data[i];
}
float &operator[](int i) {
range(i,N);
return data[i];
}
vec2 operator+(const vec2 &other) const {
return vec2(at(0)+other(0),at(1)+other(1));
}
vec2 operator-(const vec2 &other) const {
return vec2(at(0)-other(0),at(1)-other(1));
}
float operator*(const vec2 &other) const {
return at(0)*other(0)+at(1)*other(1);
}
vec2 operator*(float scale) const {
return vec2(at(0)*scale,at(1)*scale);
}
vec2 operator/(float scale) const {
return vec2(at(0)/scale,at(1)/scale);
}
float magnitude() const {
return sqrt(sqr(data[0])+sqr(data[1]));
}
float angle() const {
return atan2(data[1],data[0]);
}
float magnitude_squared() const {
return sqr(data[0])+sqr(data[1]);
}
vec2 normalized() const {
return operator*(1.0/magnitude());
}
vec2 normal() const {
return vec2(-data[1],data[0]);
}
float distance(const vec2 &b) {
const vec2 &a = *this;
return (a-b).magnitude();
}
inline vec2 cmul(const vec2 &b) const {
const vec2 &a = *this;
return vec2(a[0]*b[0]-a[1]*b[1],a[0]*b[1]+a[1]*b[0]);
}
inline vec2 cdiv(const vec2 &b) const {
const vec2 &a = *this;
double n = sqr(b[0])+sqr(b[1]);
return vec2((a[0]*b[0]+a[1]*b[1])/n,(a[1]*b[0]-a[0]*b[1])/n);
}
};
}
#endif
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