Problem D: 平面上的点和线——Point类、Line类 (V)

Description

在数学上，平面直角坐标系上的点用X轴和Y轴上的两个坐标值唯一确定，两点确定一条线段。现在我们封装一个“Point类”和“Line类”来实现平面上的点的操作。

根据“append.cc”，完成Point类和Line类的构造方法和show()方法，输出各Line对象和Point对象的构造和析构次序。

接口描述：

Point::show()方法：按格式输出Point对象。

Line::show()方法：按格式输出Line对象。

Line::SetLine(double, double, double, double)方法：设置Line对象起点的x,y坐标（第一个和第二参数）和终点的x,y坐标（第三个和第四个坐标），并返回本对象

Line::SetLine(const Point &, const Point &)方法：设置Line对象的起点（第一个参数）和终点（第二个坐标），并返回本对象

Line::SetLine(const Line&)方法：设置Line对象，复制参数的坐标，并返回本对象

Line::readLine()方法：从标准输入上读入坐标，格式见Sample

Input

输入的第一行为N，表示后面有N行测试样例。

每行为两组坐标“x,y”，分别表示线段起点和终点的x坐标和y坐标，两组坐标间用一个空格分开，x和y的值都在double数据范围内。

Output

输出为多行，每行为一条线段，起点坐标在前终点坐标在后，每个点的X坐标在前，Y坐标在后，Y坐标前面多输出一个空格，用括号包裹起来。输出格式见sample。

C语言的输入输出被禁用。

Sample Input

40,0 1,11,1 2,32,3 4,50,1 1,0

Sample Output

Point : (1, -2) is created.Point : (2, -1) is created.Point : (0, 0) is created.Point : (0, 0)Point : (0, 0) is created.Point : (0, 0) is created.Line : (0, 0) to (0, 0) is created.Point : (0, 0) is created.Point : (0, 0) is created.Line : (0, 0) to (0, 0) is created.Point : (0, 0) is created.Point : (0, 0) is created.Line : (0, 0) to (0, 0) is created.Point : (0, 0) is created.Point : (0, 0) is created.Line : (0, 0) to (0, 0) is created.Line : (0, 0) to (1, 1)Line : (1, 1) to (2, 3)Line : (2, 3) to (4, 5)Line : (0, 1) to (1, 0)Point : (1, -2) is copied.Point : (2, -1) is copied.Line : (1, -2) to (2, -1) is created.Point : (1, -2) is copied.Point : (0, 0) is copied.Line : (1, -2) to (0, 0) is created.Point : (2, -1) is copied.Point : (0, 0) is copied.Line : (2, -1) to (0, 0) is created.Point : (1, -2) is copied.Point : (2, -1) is copied.Line : (1, -2) to (2, -1) is copied.Line : (1, -2) to (2, -1)Line : (1, -2) to (2, -1)Line : (2, -1) to (0, 0)Line : (0, 0) to (2, -1)Line : (0, 0) to (2, -1) is erased.Point : (2, -1) is erased.Point : (0, 0) is erased.Line : (2, -1) to (0, 0) is erased.Point : (0, 0) is erased.Point : (2, -1) is erased.Line : (1, -2) to (2, -1) is erased.Point : (2, -1) is erased.Point : (1, -2) is erased.Line : (1, -2) to (2, -1) is erased.Point : (2, -1) is erased.Point : (1, -2) is erased.Line : (0, 1) to (1, 0) is erased.Point : (1, 0) is erased.Point : (0, 1) is erased.Line : (2, 3) to (4, 5) is erased.Point : (4, 5) is erased.Point : (2, 3) is erased.Line : (1, 1) to (2, 3) is erased.Point : (2, 3) is erased.Point : (1, 1) is erased.Line : (0, 0) to (1, 1) is erased.Point : (1, 1) is erased.Point : (0, 0) is erased.Point : (0, 0) is erased.Point : (2, -1) is erased.Point : (1, -2) is erased.

HINT

Append Code

append.cc,

#include <iostream>

using namespace std;
class Point
{
private:
    double x,y;
public:
    Point(double _x = 0,double _y = 0)
    {
        x = _x;
        y = _y;
        cout << "Point : "<< *this <<" is created." << endl;
    }
    Point(const Point &k)
    {
        x = k.x;
        y = k.y;
        cout << "Point : "<< k <<" is copied." << endl;
    }
    void setXY(double _x,double _y)
    {
        x = _x;
        y = _y;
    }
    ~Point()
    {
        cout << "Point : "<< *this <<" is erased." << endl;
    }
    friend ostream & operator<<(ostream& os ,const Point & k)
    {
        os << "(" << k.x << ", " << k.y << ")";
        return os;
    }
    void show()
    {
        cout << "Point : " << *this << endl;
    }
};
class Line
{
private:
    Point p1,p2;
    public:
        Line()
        {
             cout << "Line : "<<p1<<" to "<<p2<<" is created." << endl;
        }
        Line(const Line &k):p1(k.p1),p2(k.p2)
        {
            cout << "Line : "<<p1<<" to "<<p2<<" is copied." << endl;
        }
        Line(const Point &_p1,const Point &_p2):p1(_p1),p2(_p2)
        {
            cout << "Line : "<<p1<<" to "<<p2<<" is created." << endl;
        }
        Line(double x1,double y1,double x2,double y2):p1(x1,y1),p2(x2,y2)
        {
            cout << "Line : "<<p1<<" to "<<p2<<" is created." << endl;
        }
        void show()
        {
            cout <<"Line : "<<p1<<" to " <<p2<< endl;
        }
        Line& setLine(double x1,double y1,double x2,double y2)
        {
            p1.setXY(x1,y1);
            p2.setXY(x2,y2);
            return *this;
        }
        Line& setLine(const Point &_p1,const Point &_p2)
        {
            p1 = _p1;
            p2 = _p2;
           return *this;
        }
        Line& setLine(const Line& k)
        {
            *this = k;
            return *this;
        }
        void readLine()
        {
            char c;
            double x1,y1,x2,y2;
            cin >> x1 >>c>> y1 >> x2 >>c>> y2;
            p1.setXY(x1,y1);
            p2.setXY(x2,y2);
        }
        ~Line()
        {
            cout << "Line : "<<p1<<" to "<<p2<<" is erased." << endl;
        }
};
int main()
{
    int num, i;
    Point p(1, -2), q(2, -1), t;
    t.show();
    std::cin>>num;
    Line line[num];
    for(i = 0; i < num; i++)
    {
        line[i].readLine();
        line[i].show();
    }
    Line l1(p, q), l2(p,t), l3(q,t), l4(l1);
    l1.show();
    l2.setLine(l1).show();
    l3.show();
    l4.setLine(t,q).show();
}