#ifndef __USG_GRAPH_H__
#define __USG_GRAPH_H__

#include "usg_common.h"

struct Point { 
//public:
    double x;
    double y; 

    //Point(const double _x =0, const double _y =0) : x(_x), y(_y) {}
};

//平面向量
struct Vector2
{
    double x;
    double y;
    
};


class Edge {
public:
    const Point a, b;
    /**
     * 是否相交
    */
    bool isCorss(const Point& p) const;
};
 

 

class Figure {
    //const string  name;
    std::vector<Edge> edges;

public:
    Figure();
    //Figure(const std::initializer_list<Edge> & _edges);
    Figure(const std::vector<Edge> & _edges);
    Figure & operator=(Figure && f);       // move assignment
    bool contains(const Point& p) const;
     
};




 // 返回两个向量夹角的cos值, cos小于0即两个向量的夹角大于90度
static inline double getVector2Angle(const Vector2 & a, const Vector2 & b) {
    double doc_product =  a.x * b.x + a.y * b.y;
    double ma = sqrt(a.x * a.x + a.y * a.y);
    double mb = sqrt(b.x * b.x + b.y * b.y);
    double cos = doc_product / (ma * mb);
    return cos;
}

// 计算a指向b的向量
static inline Vector2 getVecor2(const Point &a, const Point &b) {
    return {b.x - a.x, b.y - a.y};
}

#endif