C++作业 问题 A: 简单几何绘图

文章目录

  • 问题 A: 简单几何绘图
      • 题目文字描述
      • 题目截图
      • 代码
      • 运行结果
      • 用vector实现
      • 用抽象类实现

问题 A: 简单几何绘图

题目文字描述

时间限制: 1 Sec 内存限制: 128 MB Special Judge
提交: 844 解决: 157

题目描述
本题要求实现简单基本几何:圆, 线(段)以及矩形的绘制。实现后的效果如下所示:

这里渲染使用的是OpenGL, 窗口管理使用的是GLUT。渲染和窗口管理的代码由我们给出, 不需要自己实现。
你的任务是实现圆, 线(段)以及矩形三个几何元素的相关内容:
对于圆, 给定圆心(x, y) 和半径
对于线段, 给定起点(x1,y1)和终点(x2,y2)
对于矩形,给定左(left),上(top),右(right),下(bottom)四个值。

对于每个几何对象,要求实现void input(std::istream &in) 接口,能够从in (std::in或者文件)获取坐标(半径)信息,
实现 void display(BlackBoard &board) 接口,将几何对象绘制到BlackBoard 对象 board上面,
实现 void print(std::ostream &out) 接口,将几何对象的几何坐标(半径)信息打印到 out (std::out 或者文件);
打印格式描述如下:
对于圆: Circle{center_X: 100, center_Y: 10, radius: 100}
对于线(段):Line{point1_X: -500, point1_Y: -130, point2_X:-30, point2_Y:-100}
对于矩形:Rectangle{left: -130, top: -130, right: -30, bottom: -100}
每打印一个对象需要换行,每个对象的元素之间需要空格,比如对于圆的例子,应该是: Circle{center_X:#100,#center_Y:#10,#radius:#100}, #代表空格。

由于在OJ上面的提交你看不到绘图效果,所以下面给出一个已经写好绘图渲染以及窗口管理的相关代码,你可以先在自己的电脑进行本地调试,通过了再进行OJ的提交。

本地端调试代码模板
输入
每行一个几何对象的对应的坐标或者半径信息
对于每一行(每一个对象)
第一个数字代表几何对象的类型,1代表圆,2代表线(段),3代表矩形。
后面接所需的几何坐标或者半径。

最后一行输入一个0,代表结束输入,开始绘制。
输出
输出如题目描述中的print函数所要求的格式。
样例输入 Copy
2 -500 -130 -30 -100
3 -130 -130 -30 -100
1 100 10 100
1 100 10 120
1 100 10 140
1 100 10 160
1 100 10 180
1 100 10 200
0
样例输出 Copy
Line{point1_X: -500, point1_Y: -130, point2_X: -30, point2_Y: -100}
Rectangle{left: -130, top: -130, right: -30, bottom: -100}
Circle{center_X: 100, center_Y: 10, radius: 100}
Circle{center_X: 100, center_Y: 10, radius: 120}
Circle{center_X: 100, center_Y: 10, radius: 140}
Circle{center_X: 100, center_Y: 10, radius: 160}
Circle{center_X: 100, center_Y: 10, radius: 180}
Circle{center_X: 100, center_Y: 10, radius: 200}

题目截图

C++作业 问题 A: 简单几何绘图_第1张图片

代码

/*
*2020年12月7号晚9点
*by——
/ * -----------------------------------------------------------------------*/
 
#include 
#include 
#include 
#include 
#include "GL/glut.h"
using namespace std;
/*********************************************************
 * the code below is for render and window manager
 * ********************************************************/
typedef void (*CallbackFunction)();
typedef void (*KeyboardFunction)(unsigned char key, int x, int y);
typedef void (*ReshapeFunction)(int width, int height);
typedef void (*MouseButtonFunction)(int button, int state, int x, int y);
typedef void (*MouseMotionFunction)(int x, int y);
typedef void (*IdleFunction)(void);
typedef void (*TimerFunction)(int value);

class BlackBoard
{
public:
    void InitCommandLine(int *argc, char **argv);
    void InitWindowSize(int width, int height);
    void UpdateWindowSize(int width, int height);

    // 设置窗口绘制回调函数
    void InitDisplayCallback(CallbackFunction callback);

    // 设置键盘事件回调函数
    void InitKeyboardCallback(KeyboardFunction callback);

    // 设置窗口缩放事件回调函数
    void InitReshapeCallback(ReshapeFunction callback);

    // 设置鼠标点击事件回调函数
    void InitMouseButtonCallback(MouseButtonFunction callback);

    // 设置鼠标移动事件回调函数
    void InitMouseMotionCallback(MouseMotionFunction callback);

    // 设置空闲状态回调函数
    void InitIdleCallback(IdleFunction callback);

    // 启动一个定时器,注意,只会触发一次,不会周期触发
    // 需要周期触发可在回调函数中,再次启动一个同样的定时器
    void InstallTimerCallback(unsigned int millis, TimerFunction callback, int value);

    // 创建并显示窗口,仅调用一次,之后,将进入事件循环
    void Show();

    // 标志窗口需要更新,通常是数据发生变化后,用于主动要求窗口重绘
    void Update();

    // 以下函数只用于绘制回调函数中,通常时,程序调用Update或系统发起Update-> 窗口重绘(事件循环调用绘制回调函数) -> 用以下函数绘制图形

    // 设置颜色,r/g/b为三色分量,0-1之间,
    // 如纯红为1,0,0;
    // 纯白为1,1,1
    void SetColor(double r, double g, double b);
    // 清屏
    void Clear();
    // 讲绘制图像显示出来
    void Flush();

    // 画线,参数为两个端点的x、y坐标
    void DrawLine(int x1, int y1, int x2, int y2);

    // 画圆,参数为圆圆心x、y,半径
    void DrawCircle(int x, int y, int r);

private:
    int _width, _height;
};

using std::cout;
using std::endl;

void BlackBoard::InitCommandLine(int *argc, char **argv)
{
    glutInit(argc, argv);
}

void BlackBoard::InitWindowSize(int width, int height)
{
    _width = width;
    _height = height;

    glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);
    glutInitWindowPosition(0, 0);
    glutInitWindowSize(_width, _height);

    glutCreateWindow("BlackBoard");
}

void BlackBoard::UpdateWindowSize(int width, int height)
{
    _width = width;
    _height = height;

    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
}

void BlackBoard::InitDisplayCallback(CallbackFunction callback)
{
    glutDisplayFunc(callback);
}

void BlackBoard::InitKeyboardCallback(KeyboardFunction callback)
{
    glutKeyboardFunc(callback);
}

void BlackBoard::InitReshapeCallback(ReshapeFunction callback)
{
    glutReshapeFunc(callback);
}

void BlackBoard::InitMouseButtonCallback(MouseButtonFunction callback)
{
    glutMouseFunc(callback);
}

void BlackBoard::InitMouseMotionCallback(MouseMotionFunction callback)
{
    glutMotionFunc(callback);
}

void BlackBoard::InitIdleCallback(IdleFunction callback)
{
    glutIdleFunc(callback);
}

void BlackBoard::InstallTimerCallback(unsigned int millis, TimerFunction callback, int value)
{
    glutTimerFunc(millis, callback, value);
}

void BlackBoard::Show()
{
    glutMainLoop();
}

void BlackBoard::SetColor(double r, double g, double b)
{
    glColor3f(r, g, b);
}

void BlackBoard::Update()
{
    glutPostRedisplay();
}

void BlackBoard::DrawLine(int x1, int y1, int x2, int y2)
{
    glBegin(GL_LINES);
    glVertex2f(GLfloat(x1) / _width * 2, GLfloat(y1) / _height * 2);
    glVertex2f(GLfloat(x2) / _width * 2, GLfloat(y2) / _height * 2);
    glEnd();
}

void BlackBoard::DrawCircle(int x, int y, int r)
{
    const int CIRCLE_SEGMENTATION = 360;
    const GLfloat Pi = 3.1415926536f;

    GLfloat x0 = GLfloat(x) / _width * 2;
    GLfloat y0 = GLfloat(y) / _height * 2;

    glBegin(GL_LINE_LOOP);
    for (int i = 0; i < CIRCLE_SEGMENTATION; ++i)
    {
        glVertex2f(x0 + GLfloat(r) * cos(2 * Pi * i / CIRCLE_SEGMENTATION) / _width * 2, y0 + GLfloat(r) * sin(2 * Pi * i / CIRCLE_SEGMENTATION) / _height * 2);
    }
    glEnd();
}

void BlackBoard::Clear()
{
    glClear(GL_COLOR_BUFFER_BIT);
}

void BlackBoard::Flush()
{
    glFlush();
}
/*********************************************************
 * the code above is for render and window manager
 * ********************************************************/

/*********************************************************
 * the code below is for 2D geometry manager. 
 * it is what you need to implement.
 * !Notify: this is just a example class, it doesn't mean
 * you don't need implement other class(es).
 * Just implement the function in your free.
 * ********************************************************/

 /***************只需要交这里的,这是开头****************************************************************/
 /**********************************/
 //圆类
class Circle
{
private:
    int x, y, radius;
public:
    //默认构造函数
    Circle()
    {
        x = 0;
        y = 0;
        radius = 0;
    }
    void input_circle(std::istream& is);
    void display_circle(BlackBoard& board);
    void print_circle(std::ostream& out);
};
void Circle::input_circle(std::istream& is)
{

    is >> x >> y >> radius;
}
void Circle::print_circle(std::ostream& out)
{
    out << "Circle{center_X: " << x;
    out << ", center_Y: " << y;
    out << ", radius: " << radius << "}" << std::endl;
}
void Circle::display_circle(BlackBoard& board)
{
    board.DrawCircle(x, y, radius);
}
/***************************/
//直线类
class Line
{
    int x1, y1, x2, y2;
public:
    //默认构造函数
    Line()
    {
        x1 = 0;
        y1 = 0;
        x2 = 0;
        y2 = 0;
    }
    void input_line(std::istream& is);
    void display_line(BlackBoard& board);
    void print_line(std::ostream& out);
};
void Line::input_line(std::istream& is)
{
    is >> x1 >> y1 >> x2 >> y2;
}
void Line::display_line(BlackBoard& board)
{
    board.DrawLine(x1, y1, x2, y2);
}
void Line::print_line(std::ostream& out)
{
    out << "Line{point1_X: " << x1 << ", point1_Y: " << y1;
    out << ", point2_X: " << x2 << ", point2_Y: " << y2;
    out << "}" << std::endl;
}
/*********************************************/
//矩形类
class Rectangle
{
private:
    int left, right, top, bottom;
public:
    //默认构造函数
    Rectangle()
    {
        left = 0;
        right = 0;
        top = 0;
        bottom = 0;
    }
    void input_rectangle(std::istream& is);
    void display_rectangle(BlackBoard& board);
    void print_rectangle(std::ostream& out);
};
void Rectangle::input_rectangle(std::istream& is)
{
    is >> left >> top >> right >> bottom;
}
void Rectangle::print_rectangle(std::ostream& out)
{
    out << "Rectangle{left: " << left << ", top: ";
    out << top << ", right: " << right << ", bottom: " << bottom << "}" << std::endl;
}
void Rectangle::display_rectangle(BlackBoard& board)
{
    board.DrawLine(left, top, right, top);
    board.DrawLine(left, top, left, bottom);
    board.DrawLine(left, bottom, right, bottom);
    board.DrawLine(right, top, right, bottom);
}
/*******************************************/
//一个继承圆类、直线类、矩形类的子类Shape
class Shape :public Circle, public Line, public Rectangle
{
    //Shape类只有构造函数和flag
public:
    //确定输入圆还是其他的
    int flag;
public:
    //默认构造函数,坐标值全部赋为0,flag为0
    Shape():Circle(),Line(),Rectangle()
    {
        flag = 0;
    }
};

/******************************************/
class FigureManager
{
private:
    Shape p[11];
    //确定数目
    int count;
public:
    //默认构造函数
    FigureManager();
 
    static FigureManager &handle()
    {
        static FigureManager manager;
        return manager;
    }
    // FigureManager类析构函数
    virtual ~FigureManager() {}
    // FigureManager类接口.
public:
    void input(std::istream& is);
    void display(BlackBoard& board);
    void print(std::ostream& out);
}; // class FigureManager类定义结束.
FigureManager::FigureManager()
{
    count = 0;
 
}


void FigureManager::input(std::istream& is)
{
       while (is>>p[count].flag )
    {
        if (p[count].flag == 0)//退出循环
            break;
        if (p[count].flag == 1)//圆
        {
            p[count].input_circle(std::cin);
            count++;
        }
        else if (p[count].flag == 2)//线
        {
            p[count].input_line(std::cin);
            count++;
        }
        else if (p[count].flag == 3)//矩形
        {
            p[count].input_rectangle(std::cin);
            count++;
        }
        
    }
}
void FigureManager::display(BlackBoard& board)
{
    for (int i = 0; i < count; i++)
    {
        if (p[i].flag == 1)//圆
        {
            p[i].display_circle(board);
        }
        else if (p[i].flag == 2)//线
        {
            p[i].display_line(board);
        }
        else if (p[i].flag == 3)//矩形
        {
            p[i].display_rectangle(board);
        }
    }
}
void FigureManager::print(std::ostream& out)
{
    for (int i = 0; i < count; i++)
    {
        if (p[i].flag == 1)//圆
        {
            p[i].print_circle(std::cout);
        }
        else if (p[i].flag == 2)//线
        {
            p[i].print_line(std::cout);
        }
        else if (p[i].flag == 3)//矩形
        {
            p[i].print_rectangle(std::cout);
        }
    }
}
/***************提交截止位置****************************************************************/


// 如果你的实现需要一些必要的初始化,可放在这个函数中,main函数会调用
// 如果没有,则忽略
void InitiateFigureManager()
{
}
/*********************************************************
 * the code above is for 2D geometry manager. 
 * it is what you need to implement.
 * !Notify: this is just a example class, it doesn't mean
 * you don't need implement other class(es).
 * Just implement the function in your free.
 * ********************************************************/

/*********************************************************
 * the code below is program main function. 
 * ********************************************************/
// 提供绘图环境的对象
BlackBoard board;
// 可忽略
void ReshapeCallback(int width, int height)
{
    board.UpdateWindowSize(width, height);
}
// 窗口用于处理键盘输入的回调函数入口,这里只处理了一件事,按q退出程序,可忽略
// 注意,这里的键盘输入是窗口的键盘输入,而不是命令行的
void KeyboardCallback(unsigned char key, int x, int y)
{
    switch (key)
    {
    case 'q':
        exit(0);
        break;
    }
}
// 窗口用于绘制的回调函数入口,最终会调用FigureManager的display函数
// 本次作业无需改动DisplayCallback,绘制图形应在FigureManager中完成。
void DisplayCallback()
{
    board.Clear();

    FigureManager::handle().display(board);

    board.Flush();
}

int main(int argc, char *argv[])
{
    // 如果你的实现需要一些必要的初始化,可放在这个函数中,main函数会调用
    // 如果没有,则忽略
    InitiateFigureManager();

    // 这里可切换输入方式:
    // 1、从test.txt文件输入,以方便调试时键盘输入费时。
    // 2、从命令行输入,以帮助在没有完全编写好代码时,无法用test.txt测试

#if 0
    std::ifstream input("test.txt");  
    if (!input.is_open())
    { 
        std::cout << "Error opening input file"; 
        exit(1); 
    }  
    FigureManager::handle().input(input);
#else
    FigureManager::handle().input(std::cin);
#endif

    // 以下代码用于初始化窗口等、可忽略
    board.InitCommandLine(&argc, (char **)argv);
    board.InitWindowSize(1000, 800);

    board.InitDisplayCallback(DisplayCallback);
    board.InitKeyboardCallback(KeyboardCallback);
    board.InitReshapeCallback(ReshapeCallback);
    FigureManager::handle().print(std::cout);
    board.Show();

    return 0;
}

运行结果

C++作业 问题 A: 简单几何绘图_第2张图片
C++作业 问题 A: 简单几何绘图_第3张图片

用vector实现

  • Vector实现仅仅是对FigrureManager类进行了一点改动
  • 目的是练习使用vector,及用iterator进行遍历
  • 代码如下
/*********Vector实现*************************/
  //圆类
class Circle
{
private:
    int x, y, radius;
public:
    //默认构造函数
    Circle()
    {
        x = 0;
        y = 0;
        radius = 0;
    }
    void input_circle(std::istream& is);
    void display_circle(BlackBoard& board);
    void print_circle(std::ostream& out);
};
void Circle::input_circle(std::istream& is)
{

    is >> x >> y >> radius;
}
void Circle::print_circle(std::ostream& out)
{
    out << "Circle{center_X: " << x;
    out << ", center_Y: " << y;
    out << ", radius: " << radius << "}" << std::endl;
}
void Circle::display_circle(BlackBoard& board)
{
    board.DrawCircle(x, y, radius);
}
/***************************/
//直线类
class Line
{
    int x1, y1, x2, y2;
public:
    //默认构造函数
    Line()
    {
        x1 = 0;
        y1 = 0;
        x2 = 0;
        y2 = 0;
    }
    void input_line(std::istream& is);
    void display_line(BlackBoard& board);
    void print_line(std::ostream& out);
};
void Line::input_line(std::istream& is)
{
    is >> x1 >> y1 >> x2 >> y2;
}
void Line::display_line(BlackBoard& board)
{
    board.DrawLine(x1, y1, x2, y2);
}
void Line::print_line(std::ostream& out)
{
    out << "Line{point1_X: " << x1 << ", point1_Y: " << y1;
    out << ", point2_X: " << x2 << ", point2_Y: " << y2;
    out << "}" << std::endl;
}
/*********************************************/
//矩形类
class Rectangle
{
private:
    int left, right, top, bottom;
public:
    //默认构造函数
    Rectangle()
    {
        left = 0;
        right = 0;
        top = 0;
        bottom = 0;
    }
    void input_rectangle(std::istream& is);
    void display_rectangle(BlackBoard& board);
    void print_rectangle(std::ostream& out);
};
void Rectangle::input_rectangle(std::istream& is)
{
    is >> left >> top >> right >> bottom;
}
void Rectangle::print_rectangle(std::ostream& out)
{
    out << "Rectangle{left: " << left << ", top: ";
    out << top << ", right: " << right << ", bottom: " << bottom << "}" << std::endl;
}
void Rectangle::display_rectangle(BlackBoard& board)
{
    board.DrawLine(left, top, right, top);
    board.DrawLine(left, top, left, bottom);
    board.DrawLine(left, bottom, right, bottom);
    board.DrawLine(right, top, right, bottom);
}
/*******************************************/
//一个继承圆类、直线类、矩形类的子类Shape
class Shape :public Circle, public Line, public Rectangle
{
    //Shape类只有构造函数和flag
public:
    //确定输入圆还是其他的
    int flag;
public:
    //默认构造函数,坐标值全部赋为0,flag为0
    Shape() :Circle(), Line(), Rectangle()
    {
        flag = 0;
    }
};

/******************************************/
class FigureManager
{
private:
    //定义Shape类的向量
    vector<Shape> p;
    //Shape类的对象,用于输入
    Shape temp;
    //注意,vectro的调用是不需要长度计数的,引用时直接调用迭代器vector库的iterator
public:
    //默认构造函数
    FigureManager();

    static FigureManager& handle()
    {
        static FigureManager manager;
        return manager;
    }
    // FigureManager类析构函数
    virtual ~FigureManager() {}
    // FigureManager类接口.
public:
    void input(std::istream& is);
    void display(BlackBoard& board);
    void print(std::ostream& out);
}; // class FigureManager类定义结束.
FigureManager::FigureManager()
{
}


void FigureManager::input(std::istream& is)
{
    while (is >> temp.flag)
    {
        if (temp.flag == 0)//退出循环
            break;
        if (temp.flag == 1)//圆
        {
            //输入圆
            temp.input_circle(std::cin);
            //输入的对象进入vector
            p.push_back(temp);
        }
        else if (temp.flag == 2)//线
        {
            //输入线
            temp.input_line(std::cin);
            //输入的对象进入vector p
            p.push_back(temp);
        }
        else if (temp.flag == 3)//矩形
        {
            //输入矩形
            temp.input_rectangle(std::cin);
            //输入的矩形进入vector p
            p.push_back(temp);
        }

    }
}
void FigureManager::display(BlackBoard& board)
{
    for (vector<Shape>::iterator it=p.begin();it<p.end();++it)
    {
        if ((*it).flag == 1)//圆
        {
            //显示圆
            (*it).display_circle(board);
        }
        else if ((*it).flag == 2)//线
        {
            //显示线
            (*it).display_line(board);
        }
        else if ((*it).flag == 3)//矩形
        {
            //显示矩形
            (*it).display_rectangle(board);
        }
    }
}
void FigureManager::print(std::ostream& out)
{
    for (vector<Shape>::iterator it = p.begin(); it < p.end(); ++it)
    {
        if ((*it).flag == 1)//圆
        {
            //显示圆
            (*it).print_circle(std::cout);
        }
        else if ((*it).flag == 2)//线
        {
            //显示线
            (*it).print_line(std::cout);
        }
        else if ((*it).flag == 3)//矩形
        {
            //显示矩形
            (*it).print_rectangle(std::cout);
        }
    }
}
/***************截止位置*****************************/

用抽象类实现

  • 仅仅改了类的定义和使用
  • 代码如下
/****************虚函数实现***************************/
//抽象类,基类Shape
class Shape 
{
    //Shape类只有纯虚函数
public:
    virtual void input(std::istream& is) = 0;
    virtual void display(BlackBoard& board) = 0;
    virtual void print(std::ostream& out) = 0;

};
/********************************************/
  //圆类
class Circle:public Shape
{
private:
    int x, y, radius;
public:
    //默认构造函数
    Circle()
    {
        x = 0;
        y = 0;
        radius = 0;
    }
    virtual void input(std::istream& is);
    virtual void display(BlackBoard& board);
    virtual void print(std::ostream& out);
};
void Circle::input(std::istream& is)
{

    is >> x >> y >> radius;
}
void Circle::print(std::ostream& out)
{
    out << "Circle{center_X: " << x;
    out << ", center_Y: " << y;
    out << ", radius: " << radius << "}" << std::endl;
}
void Circle::display(BlackBoard& board)
{
    board.DrawCircle(x, y, radius);
}
/***************************/
//直线类
class Line :public Shape
{
    int x1, y1, x2, y2;
public:
    //默认构造函数
    Line()
    {
        x1 = 0;
        y1 = 0;
        x2 = 0;
        y2 = 0;
    }
    virtual void input(std::istream& is);
    virtual void display(BlackBoard& board);
    virtual void print(std::ostream& out);
};
void Line::input(std::istream& is)
{
    is >> x1 >> y1 >> x2 >> y2;
}
void Line::display(BlackBoard& board)
{
    board.DrawLine(x1, y1, x2, y2);
}
void Line::print(std::ostream& out)
{
    out << "Line{point1_X: " << x1 << ", point1_Y: " << y1;
    out << ", point2_X: " << x2 << ", point2_Y: " << y2;
    out << "}" << std::endl;
}
/*********************************************/
//矩形类
class Rectangle :public Shape
{
private:
    int left, right, top, bottom;
public:
    //默认构造函数
    Rectangle()
    {
        left = 0;
        right = 0;
        top = 0;
        bottom = 0;
    }
    virtual void input(std::istream& is);
    virtual void display(BlackBoard& board);
    virtual void print(std::ostream& out);
};
void Rectangle::input(std::istream& is)
{
    is >> left >> top >> right >> bottom;
}
void Rectangle::print(std::ostream& out)
{
    out << "Rectangle{left: " << left << ", top: ";
    out << top << ", right: " << right << ", bottom: " << bottom << "}" << std::endl;
}
void Rectangle::display(BlackBoard& board)
{
    board.DrawLine(left, top, right, top);
    board.DrawLine(left, top, left, bottom);
    board.DrawLine(left, bottom, right, bottom);
    board.DrawLine(right, top, right, bottom);
}

/******************************************/
class FigureManager
{
private:
    //定义Shape类的向量
    Shape* p[100];
    //计数用
    int count;
   
public:
    //默认构造函数
    FigureManager();

    static FigureManager& handle()
    {
        static FigureManager manager;
        return manager;
    }
    // FigureManager类析构函数
    virtual ~FigureManager() {}
    // FigureManager类接口.
public:
    void input(std::istream& is);
    void display(BlackBoard& board);
    void print(std::ostream& out);
}; // class FigureManager类定义结束.
FigureManager::FigureManager()
{
    count = 0;
}
void FigureManager::input(std::istream& is)
{
    int flag;
    while (std::cin >> flag)
    {
        if (flag == 1)//代表圆
        {
            p[count] = new Circle;
            p[count]->input(std::cin);
            count++;            
        }
        if (flag == 2)//代表直线
        {
            p[count] = new Line;
            p[count]->input(std::cin);
            count++;
        }
        if (flag == 3)//代表方形
        {
            p[count] = new Rectangle;
            p[count]->input(std::cin);
            count++;
        }
        if (flag == 0)
            break;//退出,停止输入
    }
}
void FigureManager::display(BlackBoard& board)
{
    for (int i = 0; i < count; i++)
    {
        p[i]->display(board);
    }
}
void FigureManager::print(std::ostream& out)
{
    for (int i = 0; i < count; i++)
    {
        p[i]->print(std::cout);
    }
}
/***************提交截止位置****************************************************************/

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