#include <iostream>
#include<cmath>
using namespace std;
//点类Point
class Point{
private:
double x;
double y;
public:
Point(double xv=0,double yv=0);/*构造函数*/
Point(const Point &p); /*拷贝构造*/
~Point(); /*析构函数*/
virtual void show()const; /*显示*/
void setX(double xv); /*设置X坐标*/
void setY(double yv); /*设置Y坐标*/
double getX() const; /*获取X坐标*/
double getY() const; /*获取Y坐标*/
};
Point::Point(const double xv,const double yv){/*构造函数*/
x=xv;
y=yv;
cout<<"Point Constructor run"<<endl;
}
Point::Point(const Point &p){/*拷贝构造*/
x=p.x;
y=p.y;
cout<<"Point CopyConstructor run"<<endl;
}
Point::~Point(){/*析构函数*/
cout<<"Point Destructor run"<<endl;
}
void Point::show() const{/*显示*/
cout<<"Point(X="<<x<<",Y="<<y<<")";
}
void Point::setX(double xv){/*设置X坐标*/
x=xv;
}
void Point::setY(double yv){/*设置Y坐标*/
y=yv;
}
double Point::getX() const{/*获取X坐标*/
return x;
}
double Point::getY() const{/*获取Y坐标*/
return y;
}
class Plane{/*平面图形基类*/
public:
virtual double length()const=0;/*周长*/
virtual double area()const=0; /*面积*/
};
double pointDis(const Point &p1,const Point &p2)
{
return sqrt(pow(p1.getX() - p2.getX(),2) + pow(p1.getY() - p2.getY(), 2));
}
class Triangle : public Plane
{
private:
Point a, b, c;
public:
Triangle(const Point &o = Point(0,0), const Point &p = Point(0,0), const Point &q = Point(0,0)) : a(o), b(p), c(q)
{
cout << "Triangle Constructor run" << endl;
}
Triangle(const Triangle &t) : a(t.a), b(t.b), c(t.c)
{
cout << "Triangle CopyConstructor run" << endl;
}
~Triangle()
{
cout << "Triangle Destructor run" << endl;
}
void setA(const Point &t)
{
this->a = t;
}
Point getA() const
{
return a;
}
void setB(const Point &t)
{
this->b = t;
}
Point getB() const
{
return b;
}
void setC(const Point &t)
{
this->c = t;
}
Point getC() const
{
return c;
}
void show() const
{
cout<<"Triangle(A=";
a.show();
cout<<",B=";
b.show();
cout<<",C=";
c.show();
cout<<")";
}
double length() const
{
return pointDis(a,b) + pointDis(a,c) + pointDis(b,c);
}
double area() const
{
double p = length() / 2;
return sqrt(p * (p - pointDis(a,b)) *
(p - pointDis(a,c)) *
(p - pointDis(b,c)));
}
};
void length(Plane *p){/*平面图形的周长函数*/
cout<<"Length="<<p->length()<<endl;
}
void area(Plane &p){/*平面图形的面积函数*/
cout<<"Area="<<p.area()<<endl;
}
//主函数
int main(void){
double x,y;
Point p1,p2(1,1),p3(2,2);
Triangle t1,t2(t1);
t1.show();
cout<<endl;
area(t1);
length(&t1);
cin>>x>>y;
p1.setX(x);
p1.setY(y);
t2.setA(p1);
t2.setB(p2);
t2.setC(p3);
t2.show();
cout<<endl;
area(t2);
length(&t2);
return 0;
}
