C++实现简单绘图（类）C++实现简单绘图（⽤类实现）
#include<fstream>
#include<iostream>
#include<math.h>
#include<vector>
using namespace std;
using std::vector;
class Figure
{
public:
virtual void outprint(std::ostream &out)=0;
virtual void input_data(std::istream &is)=0;
virtual void draw(BlackBoard &board)=0;
//virtual Figure *create() = 0;
};
class Line:public Figure
{
double _x1,_y1,_x2,_y2;
public:
Line():_x1(0),_y1(0),_x2(0),_y2(0){}
//virtual Figure *create(){return new Line;}
void input_data(std::istream &is)
{
//std::cout<<"Point1_X: ";
is>>_x1;
//std::cout<<"Point1_Y: ";
is>>_y1;
//std::cout<<"Point2_X: ";
is>>_x2;
//std::cout<<"Point2_Y: ";
is>>_y2;
}
virtual void draw(BlackBoard &board)
{
board.DrawLine(_x1,_y1,_x2,_y2);
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virtual void outprint(std::ostream &out)
{
std::cout<<"Line{"
<<"point1_X: "<<_x1<<", "舞台剧本
<<"point1_Y: "<<_y1<<", "
<<"point2_X: "<<_x2<<", "
<<"point2_Y: "<<_y2<<"}"
<<std::endl;
}
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class Rectangle:public Figure
{
double _left,_top,_right,_bottom;
public:
//virtual Figure *create(){return new Rectangle;}
void input_data(std::istream &is)
{
//std::cout<<"Left: ";
is>>_left;
/
/std::cout<<"Top: ";
is>>_top;
//std::cout<<"Right: ";
is>>_right;
//std::cout<<"Bottom: ";
is>>_bottom;
}
virtual void draw(BlackBoard &board)
{
board.DrawLine(_left,_top,_right,_top);
board.DrawLine(_right,_top,_right,_bottom); board.DrawLine(_left,_bottom,_right,_bottom); board.DrawLine(_left,_top,_left,_bottom);
}
virtual void outprint(std::ostream &out)
{
std::cout<<"Rectangle{"
<<"left: "<<_left<<", "
<<"top: "<<_top<<", "
<<"right: "<<_right<<", "
<<"bottom: "<<_bottom<<"}"
<<std::endl;
}
};
class Circle:public Figure
{
double _x,_y,_r;
public:
//virtual Figure *create(){return new Circle;} void input_data(std::istream &is)
{
//std::cout<<"Center X: ";
is>>_x;
//std::cout<<"Center Y: ";
is>>_y;
//std::cout<<"Radius: ";
is>>_r;
}
virtual void draw(BlackBoard &board)
{
board.DrawCircle(_x,_y,_r);
}
virtual void outprint(std::ostream &out)
{
std::cout<<"Circle{"
<<"center_X: "<<_x<<", "
<<"center_Y: "<<_y<<", "
<<"radius: "<<_r<<"}"
<<std::endl;
}
};
class FigureManager
{
public:
static FigureManager &handle()
{
static FigureManager manager;
return manager;
}
// FigureManager类析构函数
virtual~FigureManager(){}
// FigureManager类接⼝.
vector<Figure *> _figures;
public:
void input(std::istream &in);
void display(BlackBoard &board);
void print(std::ostream &out);
};// class FigureManager类定义结束.
};// class FigureManager类定义结束.
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void FigureManager::input(std::istream &in)
{
int count=0;
for(count=0;count<100;count++)
{
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int shape;
do{
//cout<<"请输⼊图形的种类（1：圆， 2：线（段）， 3：矩形， 0：退出）: "; in>>shape;
}while(shape<0&& shape>3);
if(shape==0)break;
Figure *figure;
switch(shape)
{
ca2:
figure =new Line;
break;
ca3:
figure =new Rectangle;
break;
ca1:
figure =new Circle;
break;
}
figure->input_data(in);
_figures.push_back(figure);
}
}
void FigureManager::display(BlackBoard &board)
{
vector<Figure *>::iterator k;
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for(k=_figures.begin();k!=_d();++k)
{
(*k)->draw(board);
}
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void FigureManager::print(std::ostream &out)
{
vector<Figure *>::iterator k;
for(k=_figures.begin();k!=_d();++k)
{
(*k)->outprint(out);
}
}
// 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()
{
}
