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#ifndef XJ_POINT2D_
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#define XJ_POINT2D_
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#include "dllExport.h"
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#include "Common.h"
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#include <math.h>
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//2维点
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class XJ_ALGO_EXPORT Point2D
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{
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public:
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Point2D() : _x(0.0), _y(0.0){}
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~Point2D() {}
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typedef double Standard_Real;
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Point2D(Standard_Real X, Standard_Real Y) : _x(X), _y(Y){}
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inline Standard_Real& x() {return _x;}
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inline Standard_Real& y() {return _y;}
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inline Standard_Real x() const { return _x; }
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inline Standard_Real y() const { return _y; }
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bool IsZero() {return (xjdef::equivalent(_x, 0.0) && xjdef::equivalent(_y, 0.0));}
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void set(Standard_Real X, Standard_Real Y) {_x = X; _y = Y;}
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inline Point2D& operator = (const Point2D& rhs)
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{
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set(rhs.x(), rhs.y());
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return *this;
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}
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//加法运算
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inline Point2D operator + (const Point2D& rhs) const
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{
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return Point2D(_x + rhs.x(), _y + rhs.y());
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}
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inline Point2D& operator += (const Point2D& rhs)
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{
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_x += rhs.x();
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_y += rhs.y();
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return *this;
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}
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//减法运算
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inline Point2D operator - ( const Point2D& rhs) const //后面加const，则对于const 对象也能使用-操作符，否则编译不通过
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{
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return Point2D(_x-rhs.x(), _y-rhs.y());
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}
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inline Point2D& operator -= (const Point2D& rhs)
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{
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_x -= rhs.x();
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_y -= rhs.y();
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return *this;
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}
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//乘法运算
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inline double operator * (const Point2D& rhs) const
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{
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return _x*rhs.x() + _y*rhs.y();
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}
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inline Point2D operator * (double rhs) const
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{
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return Point2D(_x*rhs, _y*rhs);
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}
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inline Point2D& operator *= (double rhs)
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{
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_x *= rhs;
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_y *= rhs;
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return *this;
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}
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inline Point2D operator / (double rhs) const
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{
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return Point2D(_x/rhs, _y/rhs);
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}
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inline bool operator == (const Point2D& rhs) const {return _x == rhs.x() && _y == rhs.y();}
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//求二维向量的模
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inline double Magnitude() const
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{
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return sqrt(_x * _x + _y * _y);
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}
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inline void Normalize()
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{
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double length = Magnitude();
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if(length == 0.0)
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return;
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_x = _x / length;
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_y = _y / length;
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}
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//求二维空间中的两点之间的距离
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double Distance(const Point2D& other) const;
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//二维点到二维线上的投影点
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Point2D Perpendicular(Point2D lineBase, Point2D linedir) const;
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private:
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Standard_Real _x;
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Standard_Real _y;
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};
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//global functions
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/// Multiplication of scalar with vector.
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inline Point2D operator * (float rhs, const Point2D& rvs)
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{
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return Point2D(rvs.x()*rhs, rvs.y()*rhs);
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}
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#endif |