mirguest — Wed, 02 Feb 2011 04:01:00 GMT

虽然�q�不是很懂啊�Q�但却很有意思�?/p>

下面把辛辛苦苦打的代码脓出来�Q�大家一起学习�?/p>

下面�?Picture.h �Q?/p>

#include
using namespace std;
class P_Node{
friend class Picture;

protected:
P_Node();
virtual ~P_Node();
virtual int height() const=0;
virtual int width() const=0;
virtual void display
(ostream&,int,int)const=0;
//int max(int,int);
private:
int use;
};

class Picture{
friend ostream& operator<<(ostream&,const Picture&);
friend Picture frame(const Picture&);
friend Picture operator&(const Picture&,const Picture&);
friend Picture operator|(const Picture&,const Picture&);
friend class String_Pic;
friend class Frame_Pic;
friend class Hcat_Pic;
friend class VCat_Pic;

public:
Picture();
Picture(const char* const*,int);
Picture(const Picture&);
~Picture();

Picture& operator=(const Picture&);
private:
Picture(P_Node*);
int height() const;
int width() const;
void display(ostream&,int,int) const;
P_Node* p;
};

class String_Pic:public P_Node{
friend class Picture;
String_Pic(const char* const*,int);
~String_Pic();
int height() const;
int width() const;
void display(ostream&,int,int) const;
char** data;
int size;
};

class Frame_Pic:public P_Node{
friend Picture frame(const Picture&);
Frame_Pic(const Picture&);
int height() const;
int width() const;
void display(ostream&,int,int) const;
Picture p;
};

class VCat_Pic:public P_Node{
friend Picture operator&
(const Picture&,const Picture&);
VCat_Pic(const Picture&,const Picture&);
int height() const;
int width() const;
void display(ostream&,int,int) const;
Picture top,bottom;
};

class Hcat_Pic:public P_Node{
friend Picture operator|
(const Picture&,const Picture&);
Hcat_Pic(const Picture&,const Picture&);
int height() const;
int width() const;
void display(ostream&,int,int) const;
Picture left,right;
};

下面�?Picture.cpp �Q?/p>

#include"Picture.h"
#include
#include
using namespace std;

P_Node::~P_Node(){}
P_Node::P_Node():use(1){}

static void pad(ostream& os,int x,int y)
{
for(int i=x;i
os<<" ";
}
int max(int x,int y)
{
return x>y?x:y;
}

Picture::Picture(const char* const* str,int n):
p(new String_Pic(str,n)){}

Picture::Picture(const Picture& orig):p(orig.p)
{
orig.p->use++;
};

Picture::Picture(P_Node* p_node):p(p_node){}

Picture::~Picture()
{
if(--p->use==0)
delete p;
}

Picture& Picture::operator=(const Picture& orig)
{
orig.p->use++;
if(--p->use==0)
delete p;
p=orig.p;
return *this;
}

int Picture::height() const
{
return p->height();
}

int Picture::width() const
{
return p->width();
}

void Picture::display(ostream& o,int x,int y)const
{
p->display(o,x,y);
}

ostream& operator<<(ostream& os,const Picture& picture)
{
int ht=picture.height();
for(int i=0;i
picture.display(os,i,0);
os<
}
return os;
}

String_Pic::String_Pic(const char* const* p,int n):
data(new char* [n]),size(n)
{
for(int i=0;i
data[i]=new char[strlen(p[i])+1];
strcpy(data[i],p[i]);
}
}

int String_Pic::height() const
{
return size;
}

int String_Pic::width() const
{
int n=0;
for(int i=0;i
n=max(n,strlen(data[i]));
}
return n;
}

void String_Pic::display(ostream& os,int row,int width)const
{
int start=0;
if(row>=0&&row
os<
start=strlen(data[row]);
}
pad(os,start,width);
}

String_Pic::~String_Pic()
{
for(int i=0;i
delete[] data[i];
delete[] data;
}

Frame_Pic::Frame_Pic(const Picture& pic):p(pic){}
int Frame_Pic::height()const
{
return p.height()+2;
}
int Frame_Pic::width()const
{
return p.width()+2;
}

void Frame_Pic::display(ostream& os,int row,int wd)const
{
if(row<0||row>=height()){
  pad(os,0,wd);
}else{
  if(row==0||row==height()-1){
   os<<"+";
   int i=p.width();
   while(--i>=0)
    os<<"-";
   os<<"+";
  }else{
   os<<"|";
   p.display(os,row-1,p.width());
   os<<"|";
  }
  pad(os,width(),wd);
}
}

Picture frame(const Picture& pic)
{
return new Frame_Pic(pic);
}

VCat_Pic::VCat_Pic(const Picture& t,const Picture& b):
top(t),bottom(b){}

int VCat_Pic::height()const
{
return top.height()+bottom.height();
}
int VCat_Pic::width()const
{
return max(top.width(),bottom.width());
}
void VCat_Pic::display(ostream& os,int row,int wd)const
{
if(row>=0 && row< top.height())
  top.display(os,row,wd);
else if(row
  bottom.display(os,row-top.height(),wd);
else
  pad(os,0,wd);
}
Picture operator&(const Picture& t,const Picture& b)
{
return new VCat_Pic(t,b);
}

Hcat_Pic::Hcat_Pic(const Picture& l,const Picture& r):
left(l),right(r){}

int Hcat_Pic::height()const
{
return max(left.height(),right.height());
}
int Hcat_Pic::width()const
{
return left.width()+right.width();
}
void Hcat_Pic::display(ostream& os,int row,int wd)const
{
left.display(os,row,left.width());
right.display(os,row,right.width());
pad(os,width(),wd);
}

Picture operator|(const Picture& l,const Picture& r)
{
return new Hcat_Pic(l,r);
}

下面�?nbsp;test.cpp �Q?/p>

#include
#include
#include"Picture.h"

using namespace std;

char *init[]={"Paris","in the","Spring"};
int main()
{
Picture p(init,3);
cout<

Picture q=frame(p);
cout<

cout<<(q&(p|q))<

cout<

cout<<(p&p)<

cout<<(q&q)<

cout<
cout<
return 0;
}

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mirguest 2011-02-02 12:01 发表评论

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