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Some boilerplate c++ Vec2 class
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#ifndef __VEC2_H__ | |
#define __VEC2_H__ | |
#include <cmath> | |
template <class T> | |
class vec2 { | |
public: | |
T x, y; | |
vec2() :x(0), y(0) {} | |
vec2(T x, T y) : x(x), y(y) {} | |
vec2(const vec2& v) : x(v.x), y(v.y) {} | |
vec2& operator=(const vec2& v) { | |
x = v.x; | |
y = v.y; | |
return *this; | |
} | |
vec2 operator+(const vec2& v) const { | |
return vec2(x + v.x, y + v.y); | |
} | |
vec2 operator-(const vec2& v) const { | |
return vec2(x - v.x, y - v.y); | |
} | |
vec2 operator*(const vec2& v) const { | |
return vec2(x * v.x, y * v.y); | |
} | |
vec2& operator+=(const vec2& v) { | |
x += v.x; | |
y += v.y; | |
return *this; | |
} | |
vec2& operator-=(const vec2& v) { | |
x -= v.x; | |
y -= v.y; | |
return *this; | |
} | |
vec2& operator*=(const float v) { | |
x = x * v, | |
y = y * v; | |
return *this; | |
} | |
vec2 operator+(const T& s) const { | |
return vec2(x + s, y + s); | |
} | |
vec2 operator-(const T& s) const { | |
return vec2(x - s, y - s); | |
} | |
vec2 operator*(const T& s) const { | |
return vec2(x * s, y * s); | |
} | |
vec2 operator/(const T& s) const { | |
return vec2(x / s, y / s); | |
} | |
void set(T x, T y) { | |
this->x = x; | |
this->y = y; | |
} | |
void rotate(double deg) { | |
double theta = deg / 180.0 * M_PI; | |
double c = cos(theta); | |
double s = sin(theta); | |
double tx = x * c - y * s; | |
double ty = x * s + y * c; | |
x = tx; | |
y = ty; | |
} | |
vec2& normalize() { | |
if (length() == 0) return *this; | |
*this *= (1.0 / length()); | |
return *this; | |
} | |
float dist(vec2 v) const { | |
vec2 d(v.x - x, v.y - y); | |
return d.length(); | |
} | |
float length() const { | |
return std::sqrt(x * x + y * y); | |
} | |
void truncate(double length) { | |
double angle = atan2f(y, x); | |
x = length * cos(angle); | |
y = length * sin(angle); | |
} | |
vec2 ortho() const { | |
return vec2(y, -x); | |
} | |
static float dot(vec2 v1, vec2 v2) { | |
return v1.x * v2.x + v1.y * v2.y; | |
} | |
static float cross(vec2 v1, vec2 v2) { | |
return (v1.x * v2.y) - (v1.y * v2.x); | |
} | |
const float cross(vec2 v2) const | |
{ | |
return (x * v2.y) - (y * v2.x); | |
} | |
const const float dot(vec2 v2) const | |
{ | |
return dot(*this, v2); | |
} | |
const vec2 perpCCW() const | |
{ | |
return vec2(-y, x); | |
} | |
const vec2 perpCW() const | |
{ | |
return vec2(y, -x); | |
} | |
}; | |
typedef vec2<float> Vec2; | |
typedef vec2<double> Vec2d; | |
#define PI 3.14159265359 | |
template <class T> | |
const T min2(const T val1, const T val2) | |
{ | |
return val1 < val2 ? val1 : val2; | |
} | |
template <class T> | |
const T max2(const T val1, const T val2) | |
{ | |
return val1 > val2 ? val1 : val2; | |
} | |
template <class T> | |
float sign(const T val) { | |
return val > 0 ? 1 : val < 0 ? -1 : 0; | |
} | |
template <class T> | |
const T clamp(const T x, const T min, const T max) | |
{ | |
if (x < min) | |
return min; | |
else if (x > max) | |
return max; | |
return x; | |
} | |
#endif |
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