Problem F: 平面上的点和线——Point类、Line类 (VI)

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Problem F: 平面上的点和线——Point类、Line类 (VI)

Time Limit: 1 Sec  Memory Limit:
128 MB
Submit: 4350  Solved: 2006

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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。
Point::x()方法：取x坐标。
Point::y()方法：取y坐标。
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
Line::start()方法：取Line的起点
Line::end()方法：取Line的终点
Line::setStart()方法：设置Line的起点
Line::setEnd()方法：设置Line的终点
以下三个函数用于输出Line对象，格式同sample
showLineCoordinate(const Line&)
showLinePoint(const Line&)
showLine(const Line&)

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

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#include <iostream>
using namespace std;
class  Point
{
private:
double x_,y_;
public:
Point(){x_ = 0; y_ = 0;cout << "Point : (" << x_ << ", " << y_ <<") is created." << endl;}
Point(double xx,double yy){x_ = xx;y_  = yy;cout << "Point : (" << x_ << ", " << y_ <<") is created." << endl;}
Point(const Point & p){x_ = p.x_;y_ = p.y_;cout << "Point : (" << x_ << ", " << y_ <<") is copied." << endl;}
~Point(){ cout << "Point : (" << x_ << ", " << y_ <<") is erased." << endl;}
double getX() const {return x_;}
double getY() const {return y_;}
void show() const
{
cout << "Point : (" << x_  << ", "<< y_ << ")" <<endl;
}
double x()const{return x_;}
double y()const{return y_;}
void setXY(double xx,double yy){ x_=  xx;y_ = yy;}
void showNoEndOfLine() const
{
cout << "Point : (" << x_  << ", "<< y_ << ")"  ;
}
};
class Line
{
private:
Point st,ed;
public:
// Line():p1(),p2(){}
Line():st(0,0),ed(0,0){cout << "Line : (" << st.getX() << ", " << st.getY()<< ") to (" <<ed.getX() <<", " << ed.getY() << ")" << " is created." << endl;}
Line(const Point &sst, const Point &eed):st(sst),ed(eed)
{
cout << "Line : (" << st.getX() << ", " << st.getY()<< ") to (" <<ed.getX() <<", " << ed.getY() << ")" << " is created." << endl;
}
Line(const Line & line):st(line.st),ed(line.ed){ cout << "Line : (" << st.getX() << ", " << st.getY()<< ") to (" <<ed.getX() <<", " << ed.getY() << ")" << " is copied." << endl;  }
void show() const
{
cout << "Line : (" << st.getX() << ", " << st.getY()<< ") to (" <<ed.getX() <<", " << ed.getY() << ")" <<endl;
}
Line &setLine(double x1,double y1,double x2,double y2)
{
st.setXY(x1,y1);
ed.setXY(x2,y2);
return *this;
}
Line & setLine(const Line &pt)
{
st = pt.st;//copy
ed = pt.ed;
return *this;
}
Line & setLine(const Point &sst,const Point &eed)
{
st = sst;//copy
ed = eed;
return *this;
}
void readLine()
{
double x1,y1,x2,y2;
char ch ;
cin >> x1 >>ch >>y1>> x2 >> ch >>y2;
st.setXY(x1,y1);
ed.setXY(x2,y2);
}
const Point  &start() const {return st;}
const  Point  &end() const  {return ed;}
void setStart(const Point & pt){ st = pt;}
void setEnd(const Point & pt){ed = pt;}
~Line()
{
cout << "Line : (" << st.getX() << ", " << st.getY()<< ") t
b651
o (" <<ed.getX() <<", " << ed.getY() << ")" << " is erased." << endl;
}
};
void showLineCoordinate(const Line& line)
{
std::cout<<"Line : ";
std::cout<<"("<<line.start().x()<<", "<<line.start().y()<<")";
std::cout<<" to ";
std::cout<<"("<<line.end().x()<<", "<<line.end().y()<<")";
std::cout<<std::endl;
}

void showLinePoint(const Line& line)
{
std::cout<<"Line : ";
line.start().showNoEndOfLine();
std::cout<<" to ";
line.end().showNoEndOfLine();
std::cout<<std::endl;
}

void showLine(const Line& line)
{
line.show();
}

int main()
{
int num, i;
Point p(1, -2), q(2, -1), t;
t.show();
std::cin>>num;
Line line[num + 1];
for(i = 1; i <= num; i++)
{
line[i].readLine();
showLine(line[i]);
}
Line l1(p, q), l2(p,t), l3(q,t), l4(l1);
showLineCoordinate(l1);
showLinePoint(l2);
showLinePoint(l3.setLine(l1));
showLineCoordinate(l4.setLine(t,q));
line[0].setStart(t);
line[0].setEnd(q);
}