80 lines
1.6 KiB
C++
80 lines
1.6 KiB
C++
#ifndef VEC2D_H_INCLUDED
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#define VEC2D_H_INCLUDED
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#include <cmath>
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#include <ostream>
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class vec2d {
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public:
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double x;
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double y;
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vec2d& operator=(const vec2d& other) {
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x = other.x;
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y = other.y;
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return *this;
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}
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vec2d& operator+=(const vec2d& other) {
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x += other.x;
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y += other.y;
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return *this;
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}
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vec2d& operator-=(const vec2d& other) {
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x -= other.x;
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y -= other.y;
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return *this;
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}
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vec2d& operator*=(double l) {
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x *= l;
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y *= l;
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return *this;
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}
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vec2d operator+(const vec2d& other) const {
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return vec2d{x + other.x, y + other.y};
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}
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vec2d operator-(const vec2d& other) const {
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return vec2d{x - other.x, y - other.y};
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}
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vec2d operator*(double l) const {
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return vec2d{x * l, y * l};
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}
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vec2d operator/(double a) const {
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return vec2d{x / a, y / a};
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}
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vec2d& rotate(double angle) {
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double sin_a = sin(angle);
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double cos_a = cos(angle);
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double x1 = x;
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double y1 = y;
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x = cos_a * x1 - sin_a * y1;
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y = sin_a * x1 + cos_a * y1;
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return *this;
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}
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static double dot(const vec2d& a, const vec2d& b) {
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return a.x * b.x + a.y * b.y;
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}
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static double cross(const vec2d& a, const vec2d& b) {
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return a.x * b.x + a.y * b.y;
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}
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};
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static inline std::ostream& operator<<(std::ostream& os, vec2d& p) {
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return os << '(' << p.x << ", " << p.y << ')';
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}
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static inline vec2d operator*(double l, const vec2d& v) {
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return vec2d{v.x * l, v.y * l};
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}
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#endif
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