SDUST 平面上的点和线——Point类、Line类 (V)

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本文探讨了在平面直角坐标系中，如何通过封装Point类和Line类来操作点和线段，详细介绍了类的构造方法、显示方法以及线段设定方法。通过实例演示了构造和析构过程，展示了对象的创建、复制与销毁。

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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

0,0 1,1

1,1 2,3

2,3 4,5

0,1 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.

Line : (0, 0) to (0, 0) is created.

Point : (0, 0) is created.

Line : (0, 0) to (0, 0) is created.

Point : (0, 0) is created.

Line : (0, 0) to (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 : (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 : (2, -1) is erased.

Point : (1, -2) is erased.

HINT

#include <iostream>
using namespace std;
class Point
{
public:
    double x1,y1;
public:
    Point(double  xx1 = 0,double yy1 = 0)
    {
        x1 = xx1;
        y1 = yy1;
        cout<<"Point : ("<<x1<<", "<<y1<<") is created."<<endl;
    }
    void show()
    {
        cout<<"Point : ("<<x1<<", "<<y1<<")"<<endl;
    }
    ~Point()
    {
        cout<<"Point : ("<<x1<<", "<<y1<<") is erased."<<endl;
    }
    Point (const Point& p)
    {
        x1 = p.x1;
        y1 = p.y1;
        cout<<"Point : ("<<x1<<", "<<y1<<") is copied."<<endl;
    }
    double getx()
    {
        return x1;
    }
    double gety()
    {
        return y1;
    }
};
class Line
{
private:
    Point x;
    Point y;
public:
    Line(double x1 = 0,double y1 = 0,double x2 = 0,double y2 = 0):x(x1,y1),y(x2,y2)
    {
        cout<<"Line : ("<<x.getx()<<", "<<x.gety()<<") to ("<<y.getx()<<", "<<y.gety()<<") is created."<<endl;
    }
    ~Line()
    {
        cout<<"Line : ("<<x.getx()<<", "<<x.gety()<<") to ("<<y.getx()<<", "<<y.gety()<<") is erased."<<endl;
    }
    void show()
    {
        cout<<"Line : ("<<x.getx()<<", "<<x.gety()<<") to ("<<y.getx()<<", "<<y.gety()<<")"<<endl; 
    }
    Line(const Point& p,const Point& q):x(p),y(q)
    {
        cout<<"Line : ("<<x.getx()<<", "<<x.gety()<<") to ("<<y.getx()<<", "<<y.gety()<<") is created."<<endl; 
    }
    Line(const Line&l):x(l.x),y(l.y)
    {
        cout<<"Line : ("<<x.x1<<", "<<x.y1<<") to ("<<y.x1<<", "<<y.y1<<") is copied."<<endl;
    }
    void readLine()
    {
        char c;
        int a1,b1,c1,z1;
        cin>>x.x1>>c>>x.y1>>y.x1>>c>>y.y1;
    }
    Line& setLine(const Point &p,const Point &q)
    {
        x=p;
        y=q;
        return *this;
    }
    Line& setLine(const Line &p)
    {
        *this = p;
        return *this;
    }

};
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();
}