75 lines
1.3 KiB
C++
75 lines
1.3 KiB
C++
#ifndef VEC2D_H_INCLUDED
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#define VEC2D_H_INCLUDED
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#include <cmath>
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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 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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