#include <iostream>
//根据点的定义，写出线段和三角形的定义，并通过主程序进行验证
//mypoint.h
class myPoint
{
public:
	myPoint();
	myPoint(double x, double y);
	double getX();
	double getY();
private:
	double mX,mY;
};

#include <iostream> // 用于cout, cin, endl
#include <cmath>    // 用于pow, sqrt

using namespace std;
// Line类的声明
class Line {
private:
    myPoint p1, p2;

public:
    Line(myPoint a, myPoint b) : p1(a), p2(b) {}
    double GetDistance() {
        return sqrt(pow(p2.getX() - p1.getX(), 2) + pow(p2.getY() - p1.getY(), 2));
    }
};

// Triangle类的声明
class Triangle {
private:
    myPoint p1, p2, p3;
    Line l1, l2, l3;

public:
    Triangle(myPoint a, myPoint b, myPoint c) : p1(a), p2(b), p3(c), l1(a, b), l2(a, c), l3(b, c) {}
    double getGirth() {
        return l1.GetDistance() + l2.GetDistance() + l3.GetDistance();
    }
    double getArea() {
        double s = getGirth() / 2;
        return sqrt(s * (s - l1.GetDistance()) * (s - l2.GetDistance()) * (s - l3.GetDistance()));
    }
};

// myPoint类的实现
myPoint::myPoint() : mX(0), mY(0) {}
myPoint::myPoint(double x, double y) : mX(x), mY(y) {}
double myPoint::getX() { return mX; }
double myPoint::getY() { return mY; }

int main()
{
	double x1, x2, x3, y1, y2, y3;
	cout << "请输入点1的x的值：";
	cin >> x1;
	cout << "请输入点1的y的值：";
	cin >> y1;
	cout << "请输入点2的x的值：";
	cin >> x2;
	cout << "请输入点2的y的值：";
	cin >> y2;
	cout << "请输入点3的x的值：";
	cin >> x3;
	cout << "请输入点3的y的值：";
	cin >> y3;
	cout << "点1的坐标为：(" << x1 << "," << y1 << ")" << endl;
	cout << "点2的坐标为：(" << x2 << "," << y2 << ")" << endl;
	cout << "点3的坐标为：(" << x3 << "," << y3 << ")" << endl;
	myPoint  p1(x1,  y1),  p2(x2,  y2),  p3(x3,  y3);
        Line    line1(p1,p2),line2(p1,p3),line3(p2,p3);
        cout<<"边长1的长度:"<<line1.GetDistance()<<endl;
        cout<<"边长2的长度:"<<line2.GetDistance()<<endl;
        cout<<"边长3的长度:"<<line3.GetDistance()<<endl;
	Triangle t(p1, p2, p3);
	cout << "该三角形的周长为：" << t.getGirth() << endl;
	cout << "该三角形的面积为：" << t.getArea() << endl;
	return 0;
}