公式编辑dlg.cpp

这是一个公式编辑器

// 公式编辑Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "公式编辑.h"
#include "公式编辑Dlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About
/////////////////////////////////////////////////////////////////////////////
//链表
struct ListNode
{
int cx;
int step;
ListNode * next;
ListNode * before;
};
struct Node
{
int ud;
Node * next;
Node * before;
};
class udList
{
private:
	Node * first;
	Node * Cur;
public:
	udList()
	{first=Cur=new Node;
	first->next=NULL;
	first->before=NULL;
	first->ud=3;
	}
	void putin(int num)
	{
	Node * temp=new Node;
	temp->ud=num;
	temp->before=Cur;
	temp->next=NULL;
	Cur->next=temp;
	Cur=temp;
	
	}
	void back(int &num)
	{Node * temp=Cur;
	
	Cur=Cur->before;
	num=temp->ud;
	Cur->next=NULL;
	delete temp;
	}

};
class List
{
private:
	ListNode * first;
	ListNode * Cur;
public:
	List(int x)
	{first=Cur=new ListNode;
	Cur->cx=x;
	Cur->step=0;
	Cur->next=NULL;
	Cur->before=NULL;
	}
	~List()
	{
	while(first!=NULL)
	{
	Cur=first;
	first=first->next;
	delete Cur;
	}
	}
	int biggsetStep()
	{
		ListNode * temp=first;
		while(temp->next!=NULL)
		{
		temp=temp->next;
		}
		return temp->step;
	}
	void AddToList(int num,int step)
	{
		if(biggsetStep()<step){
			ListNode *temp=new ListNode;
			temp->cx=num;
			temp->step=Cur->step++;
			temp->next=NULL;
			temp->before=Cur;
			Cur=temp;
			}
		if(Cur->step==step){
			if(Cur->cx<num)
			{Cur->cx=num;
			if(Cur->next!=NULL)
			Cur=Cur->next;
			}
		}
		
	}
	void BackToList(long & x)
	{
	x=Cur->cx;
	if(Cur->before!=first)
	Cur=Cur->before;	
	
	
	}
};

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyDlg dialog

CMyDlg::CMyDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CMyDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CMyDlg)
	m_input = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CMyDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CMyDlg)
	DDX_Text(pDX, IDC_ED_INPUT, m_input);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CMyDlg, CDialog)
	//{{AFX_MSG_MAP(CMyDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BT_TRANSEFER, OnBtTransefer)
	ON_BN_CLICKED(IDC_BT_CLEAR, OnBtClear)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyDlg message handlers

BOOL CMyDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CMyDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CMyDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CMyDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CMyDlg::OnBtTransefer() 
{
	// TODO: Add your control notification handler code here
		GetDlgItem(IDC_ED_INPUT)->GetWindowText(m_input);
	CWnd * pWnd=GetDlgItem(IDC_ED_OUTPUT);
	CDC	 * pDC=pWnd->GetDC();
	CFont *pfont=pWnd->GetFont();
	LOGFONT lf;
	pfont->GetLogFont(&lf);
	lf.lfHeight*=3;
	lf.lfWidth*=3;
	pDC->SelectObject(pfont);
	int a=2;//表示字体显示大小级别
	CSize current(100,70);
	List list(current.cx);
	int step=0;
	int newlast=0;//表示最后一级的横位置
	int yulei=current.cy ;//表示开始的 纵位置
	udList ud;
	for(int i=0;i<m_input.GetLength();i++)
	{
		switch(m_input[i])
		{
//上标符号全局变量置1
		case '^':{
					m_ud=1;
					break;
				}
//下标符号   全局变量置0
		case '_':{
					m_ud=0;
					break;
				 }
//{，A^{B_{5}}_{4}
		case '{':{	
				//current的纵坐标在全局变量的指导下提1/3或者降2/3
				ud.putin(m_ud);
				if(m_ud==1){
					current.cy-=abs(lf.lfHeight/3);
					}
				if(m_ud==0){
					current.cy+=abs(2*lf.lfHeight/3);
					}
		//字体变小为当前字体小一级
				lf.lfHeight/=a;
				lf.lfWidth/=a;
				step++;
				break;
				}
//如果是}，
		case'}':{
			//字体变大为当前字体大一级
				ud.back(m_ud);
				lf.lfHeight*=a;
				lf.lfWidth*=a;
	//current的纵坐标在全局变量的指导下恢复原来的地方
				if(m_ud==1){
					current.cy+=abs(lf.lfHeight/3);
					}
				if(m_ud==0){
					current.cy-=abs(2*lf.lfHeight/3);
					}
				step--;	//
				//恢复current的cx
				list.BackToList(current.cx);
				break;
				}
//如果是字母 
		default:
			{//按照当前位置+字体输出
				CFont * pfont=new CFont;
				pfont->CreateFontIndirect(&lf);
				pDC->SelectObject(pfont);
				//////////////////////////
		//	A^{3_{a}^{b}}_{4}B_{5}
				
				if(i!=0&&m_input[i-1]=='}')
				{
				current.cx=newlast;
				current.cy=yulei;
				}//重新开始的东西
				pDC->TextOut(current.cx,current.cy,m_input[i]);
				delete pfont;//删除旧字体
				if(i!=0&&m_input[i-1]=='{')
					list.AddToList(current.cx,step);
				
				//修改current的位置，其中横坐标等于当前坐标+字体宽度。
				char c=m_input[i];
				current.cx+=pDC->GetTextExtent(&c,1).cx;
				if(newlast<current.cx)
				newlast=current.cx;
				
			}//case的结尾

	
		}//switch结尾
	}//for结尾
	
}


void CMyDlg::OnBtClear() 
{
	// TODO: Add your control notification handler code here
		m_input.Empty();
	GetDlgItem(IDC_ED_INPUT)->SetWindowText(m_input);
	Invalidate();
	
}