多边形顺时针方向判断公式及C++代码实现一

//#include "PolygonInterMul.h" #pragma once //编译一次 #ifndef Const_PI_H #define Const_PI_H const double PI=3.141592654; const double e=2.718; #endif #ifndef PolygonInterMul_H #define PolygonInterMul_H //顶点对象 public struct Top_Point { void set(double x,double y,double z) { this->X =x; this->Y =y; this->Z =z; }; double X; double Y; double Z; }; //顶点对象 public class Top_PointClass { public: void set(double x,double y,double z) { this->X =x; this->Y =y; this->Z =z; }; double X; double Y; double Z; }; //失量/向量 public struct Vertex { void set(double i,double j,double k) { this->I=i; this->J=j; this->K=k; }; double I; double J; double K; }; // class PolygonInterMul { public : PolygonInterMul(); ~PolygonInterMul(); public : //求向量p1->p2 Vertex getVertex(Top_Point p1,Top_Point p2); //求叉积 Vertex getInterMul(Vertex v1,Vertex v2); //求向量夹角 double getJJ(Vertex v1,Vertex v2); //测试 void Test(); //三顶点求面积p1->p2->p3 (顶点成逆时针回路) double getArea(Top_Point p1,Top_Point p2,Top_Point p3); //多顶点求面积 (顶点成逆时针回路) 梯形法 double getArea(System::Collections::ArrayList PointList); double getArea(Top_PointClass *PointArray); //?? private: double Nums; }; #endif