多态图形

实验要求：

定义平面图形类Shape,至少包含虚函数(或纯虚函数)成员getPerimeter()、getArea()、getClassName()和Draw();类Line, Trapezoid, Triangle, Circle分别表示线段、梯形、三角形和圆形。Rectangle继承自Trapezoid表示矩形，Square继承自Rectangle表示正方形。重载派生类的Draw()函数完成使用*打印对应图形。
在main中使用vector《Shape *》 管理多个上述对象，并定义函数DrawShapes(const vector 《Shape *》 & v)画出所有v中的图形。
（选做）考虑使用控制台类控制输出位置，组成复杂图形（暂时未实现）

Shape.h

#pragma once
#include<iostream>
using namespace std;
#define Pi 3.14
class Shape
{
public:
    Shape(void);
    virtual float getPerimeter();
    virtual float getArea();
    virtual char* getClassName();
    virtual void Draw();

    ~Shape(void);
};

Shape.cpp

#include "Shape.h"


Shape::Shape(void)
{
}
    float Shape::getPerimeter()
    {
            return 1;
    };
    float Shape::getArea()
    {
            return 1;
    };
    char* Shape::getClassName()
    {
            return "True";
    };
    void Shape::Draw()
    {
            
    };


Shape::~Shape(void)
{
}

Line.h

#pragma once
#include"Shape.h"
class Line:public Shape
{
public:
    Line(float l);
    float getPerimeter();
    float getArea();
    char* getClassName();
    void Draw();
    ~Line(void);
private:
    float l;
};

Line.cpp

#include "Line.h"


Line::Line(float x):l(x)
{
}
float Line::getPerimeter()
{
    return l;
}
float Line::getArea()
{
    return 0;
}
char* Line::getClassName()
{
    return "Line";
}
void Line::Draw()
{
    for(int i=0;i<(int)l;i++)
        cout<<"*";
}

Line::~Line(void)
{
}

Circle.h

#pragma once
#include"Shape.h"
class Circle:public Shape
{
public:
    Circle(float x);
    float getPerimeter();
    float getArea();
    char* getClassName();
    void print_char(int x1,int x2);
    void Draw();
    ~Circle(void);
private:
    float semidiameter;
};

Circle.cpp

#include "Circle.h"


Circle::Circle(float x):semidiameter(x)
{
}
float Circle::getPerimeter()
{
    return 2*Pi*semidiameter;
}
float Circle::getArea()
{
    return Pi*semidiameter*semidiameter;
}
char* Circle::getClassName()
{
    return "Circle";
}
void Circle::print_char(int x1,int x2)
{
    int i;
    // 计算这一行的宽度，终端最多显示80列
    int n = max(x1, x2) + 1;
    n = n > 80 ? 80 : n;
    for (i = 0; i < n; i++)
    {        
        if (i == x1 || i == x2)
            printf("*");
        else
             printf(" ");
    }
     printf("
");
}
void Circle::Draw()
{
    int r=(int)semidiameter;
    int x1, x2, y;
   int d = 2 * r;
    int offset;
    for(y = 0; y <= d; y++)
     {
         /*终端字符宽高比为2:1*/
        offset = (int)(0.5 + sqrt((double)(r*r - (y-r)*(y-r)))*2.0);
        x1 = d - offset;
        x2 = d + offset;
        print_char(x1, x2);
    }
}

Circle::~Circle(void)
{
}

Triangle.h

#pragma once
#include"Shape.h"
#include<cmath>
class Triangle:public Shape
{
public:
    Triangle(float d,float h);
    float getPerimeter();
    float getArea();
    char* getClassName();
    void Draw();
    ~Triangle(void);
private:
    float d,h;
};

Triangle.cpp

#include "Triangle.h"
Triangle::Triangle(float d,float h):d(d),h(h)
{
}
float Triangle::getPerimeter()
{
    return sqrt((d/2)*(d/2)+h*h)*2+d;
}
float Triangle::getArea()
{
    return d*h/2;
}
char* Triangle::getClassName()
{
    return "Triangle";
}
void Triangle::Draw()
{
    //输出另外一种由星号组成的三角形(星号居中对齐)
    int a=(int)h;//控制组成三角形的星号的行数
    for(int i=1;i<a+1;i++)//控制行数
    {
        for(int j=a-i;j>=0;j--)
        {
            cout<<"  ";//这里是两个空格
        }
        for(int k=0;k<2*i-1;k++)//控制每行星号的个数。
        {
            if(i==0||i==a)
            {
                cout<<"* ";//星号后加了一个空格（为使打印出一图形更直观）。
            }
            else
            if(k==0||k==2*i-2)
                {
                    cout<<"* ";
                }
            
                else
                    cout<<"  ";
        }
        cout<<endl;
    }
}
Triangle::~Triangle(void)
{
}

Trapezoid.h

#pragma once
#include"Shape.h"
class Trapezoid:public Shape
{
public:
    Trapezoid(void);
    Trapezoid(float x1,float x2,float x3,float x4,float x5);
    float getPerimeter();
    float getArea();
    char* getClassName();
    void Draw();
    ~Trapezoid(void);
private:
    float a,b,c,d,e;
};

Trapezoid.cpp

#include "Trapezoid.h"

Trapezoid::Trapezoid(void)
{

}
Trapezoid::Trapezoid(float x1,float x2,float x3,float x4,float x5)
{
    a=x1;b=x2;c=x3;d=x4;e=x5;
}
float Trapezoid::getPerimeter()
{
    return a+b+c+d+e;
}
float Trapezoid::getArea()
{
    return a+b;
}
char* Trapezoid::getClassName()
{
    return "Trapezoid";
}
void Trapezoid::Draw()
{

    b=a;
    for(c=1;c<=a;c++)

    {

    for(d=1;d<=a-c;d++)

    printf(" ");

    for(e=1;e<=b;e++)

    if(c==1||c==a) printf("*");

    else if(e==1||e==b) printf("*");

    else printf(" ");

    b=b+2;

    printf("
");

    }
}

Trapezoid::~Trapezoid(void)
{
}

Rectangle.h

#pragma once
#include"Trapezoid.h"
class Rectangle:public Trapezoid
{
public:
    Rectangle(float h,float j);
    Rectangle(void);
    float getPerimeter();
    float getArea();
    char* getClassName();
    void Draw();
    ~Rectangle(void);
private:
    float mi,mj;
};

Rectangle.cpp

#include "Rectangle.h"


Rectangle::Rectangle(float h,float j):mi(h),mj(j)
{

}
Rectangle::Rectangle(void)
{

}
float Rectangle::getPerimeter()
{
    return (mi+mj)*2;
}
float Rectangle::getArea()
{
    return mi*mj;
}
char* Rectangle::getClassName()
{
    return "Rectangle";
}
void Rectangle::Draw()
{
    int mi=(int)this->mi;
    int mj=(int)this->mj; 

    for(int i=0;i<mi;i++) 
    { 
    for(int j=0;j<mj;j++) 
    { 
        if(i==0||i==mi-1) 
        cout<<"*"; 
        else if(j==0||j==mj-1) 
        cout<<"*"; 
        else 
        cout<<" "; 
    } 
    cout<<endl; 
    } 
}
Rectangle::~Rectangle(void)
{
}

Square.h

#pragma once
#include"Rectangle.h"
class Square:public Rectangle
{
public:
    Square(float a);
    float getPerimeter();
    float getArea();
    char* getClassName();
    void Draw();
    ~Square(void);
private:
    float a;
};

Square.cpp

#include "Square.h"


Square::Square(float a):Rectangle(a,a)
{
    this->a=a;
}
float Square::getPerimeter()
{
    return 4*a;
}
float Square::getArea()
{
    return a*a;
}
char* Square::getClassName()
{
    return "Square";
}
void Square::Draw()
{
    //输出m行m列的空心正方矩形。
    int m=(int)a;//m用来控制行列数。
    for(int i=0;i<m;i++)//控制打印的行数
    {
        for(int j=0;j<m;j++)
        {
            if(i==0||i==m-1)
            {
                cout<<"* ";//星号后有一个空格
            }
            else
                if(j==0||j==m-1)
                {
                    cout<<"* ";
                }
                else
                    cout<<"  ";
        }
        cout<<endl;
    }
}

Square::~Square(void)
{
}

main.cpp

#include<iostream>

#include"Circle.h"
#include"Line.h"
#include"Rectangle.h"
#include"Shape.h"
#include"Trapezoid.h"
#include"Triangle.h"
#include"Square.h"
#include"Circle.h"

#include<vector>

using namespace std;
void DrawShape(const vector <Shape*> &s)
{
    for(int q=0;q<=5;q++)
    {
        s[q]->Draw();
        cout<<endl<<endl;
    }
}

void main()
{
    vector <Shape*> vec (6);
 
    Line lin(11);
    vec[0] = &lin;

    Trapezoid tra(6,6,8,10,12);
    vec[1] = &tra;

    Triangle tri(4,4);
    vec[2]=&tri;

    Circle cir(6);
    vec[3]=&cir;

    Rectangle rec(9,13);
    vec[4]=&rec;

    Square squ(7);
    vec[5]=&squ;


    DrawShape(vec);



}