Email Password Remember me?  Lost your password?

• Download source files - 121 Kb
• Download demo project - 66 Kb

We needed a mathematical formula editor that was able to export the content of the formulas into a programming language (FORTRAN 77 in our case). Therefore we developed a set of classes described below.

Parts of the code are based on the work of

• Chris Maunder (CGridCtrl, CColourPopup),
• Alexander Bischofberger (CColourPopup),
• Matt Weagle (CFormulaInplaceEdit),
• Norm Almond (CFontCombo),
• Shekar Narayanan and S. D. Rajan (CToolBarBtn),
• Keith Rule (CUndo)

General appearance

The following files and classes are included into the source code :

Core Data Structure

Editing and Visualizing

Helper classes

The basic approach of the formula-editor is the representation of mathematical content in a binary-tree data-structure. the extraction of the content is performed by an inorder-traversal through the binary tree.

Algorithm	Binary tree	Output
inorder traversal through a binary tree inorder (node) { inorder (left_child); process (this); inorder (right_child); }

The base class CNode was originally designed as an abstract base class, but it currently provides the standard behaviour of a node. (draw my left child on the left, draw my right child on the right and draw my own content into the middle). If you want to integrate a new node you have to do the following steps:

1. Define a new node-type (insert a new unique NT_* define into the node.h)
2. Declare a new node-entity in the nodeentities.h (derive it public from CNode)
class CMyNode : public CNode
3. Implement the methods
   virtual void Serialize(CArchive& ar, CBinTree* pTree);
virtual void TransformRects(CRect& ,CRect& ,CRect& ,CRect& );
virtual CRect GetContentRect(CDC* pDC);
virtual void DrawContent(CDC* pDC, CRect rect, DWORD dwSelect);
4. Insert a new button into a already present ToolbarBtn or build a new ToolbarBtn with your own node
5. Handle the ToolBarCtrlSelected Event for your node (in the FormulaDlg_ToolBar.cpp file)

Please have a look on the implementation of the already integrated nodes for further details. Here is a list of them and ther interdependencies:

Please see the implemented TransformRect and DrawContent methods as an example! There are a lot of ways to code them much better. Any suggestions and refinements are welcome.

If you want to use this code in your project you only have to import the classes and to call the DoModal-method of the FormulaDlg.Please be careful with the resources. The resources for the toolbar of the formula-dialog are included via compiletime-directives (resource includes-submenu in the view -menu of the developer-studio)

#include "mathsym.h"

#include "mathsym.rc"

#include "FormulaDlg.h"


void CMainFrame::OnFormula() 
{
    CFormulaDlg FormulaDlg;
    FormulaDlg.DoModal();
}

The core-classes with there attributes and methods look as follow:

CBinTree

CNode

Features

The formula-control has got the following additional features:

• Copy, cut and paste (currently you are allowed to paste into placeholder-nodes only )
• Drag & Drop (currently you are allowed to drop onto placeholder-nodes only)
• Export into a Bitmap
• Printing and Print-Preview is realized via DDB
• Sourcecode export (currently only FORTRAN 77 is implemented)

How to use...

Select an equation-node from the equation-toolbar-button. Then you get an equation with placeholders on the left and on the right side. By moving the mouse over the equation the nodes are highlited. Select a placeholder with a single left-mouseclick. Now you can overwrite the placeholder with any node you want. By selecting a node with a double-click, the whole subtree of the node is selcted (e.g select the = from an equation with a doubleclick and either the left and the right side of the equation are selected). If you select a variable-node, a constant-node, a number-node or a userfunction-node you get into the editing by another left-mouseclick.

History

• Reduced Flickering (Scrolling and Updating)
• Drag&Drop refined
• Modified FormulaInPlaceEdit
• Added WMF export
• CRangeNode refined

Environment:
Windows NT 4.0 Service Pack 6
MFC Version: 6.0
Service Pack: 5

DataPool engineering
Essener Str. 99
D-46047 Oberhausen

Internet: www.dp-e.de
thorsten.wack@dp-e.de

You must Sign In to use this message board.

Per page 102550

FirstPrevNext

Help~ me. Yails 21:34 6 Jun '06   Hello, I'm Yail, Kim. I try to compile your source(formula editor)... Your source seems so good.(I think very excellent source).. I do not compile this source. So, some characters are compile error..~.. (My computer is Windows XP (Korean...), VC++ 6.0(SP 6)) -----------(nodeentities.cpp, line : 701) m_straShortCuts.Add("?); //<-- Compile Error... may be "<="... m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T(".LE.")); these characters are 98 times.... (these characters are so many...So~ Please this source re-compress, and then please send to me.. Any one~ please.... ) I download the source at this site(www.codeproject.com). I unzip that source using winzip. Why??? Unknown character??? ("Symbol") Please, can you send the source package to me by e-mail? My E-mail is yails@citicomm.co.kr Please~ Best regards... ============================= Kim Yail / Engineer Mobile : +82+10-2273-6900 E-mail: yails@citicomm.co.kr ============================= Sign In·View Thread·PermaLink 3.67/5 Re: Help~ me. gmaoyou 6:09 28 Sep '06   modify the file in this way. CEquationNode::CEquationNode() { char acs; //////////111111111 m_strNodeType=NT_EQUATION; m_straShortCuts.SetSize(0,1); m_straFontNames.SetSize(0,1); m_straShortCuts.Add("="); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add(acs=0xa3); /////////////111111 and so on !!!! m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T(".LE.")); m_straShortCuts.Add(acs=0xb3); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T(".GE.")); m_straShortCuts.Add("<"); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T(".LT.")); m_straShortCuts.Add(">"); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T(".GT.")); m_straShortCuts.Add(acs=0xb9); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T(".NE.")); m_straShortCuts.Add(acs=0xba); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add(acs=0xbb); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add("@"); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add(acs=0xc7); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add(acs=0xc8); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add(acs=0xc9); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add(acs=0xca); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add(acs=0xcb); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add(acs=0xcc); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add(acs=0xcd); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add(acs=0xce); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add(acs=0xcf); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add("'"); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add("$"); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_straShortCuts.Add("\""); m_straFontNames.Add("Symbol"); m_straKeyWords[LT_FORTRAN].Add(_T("=")); m_strShortCut=""; m_strName="equation"; m_nType=0; m_nAssociativityLevel=20; } G-RdOX-Gen. email longes@56.com Sign In·View Thread·PermaLink 3.00/5 Great Article Hadi Dayvary 21:38 27 May '06   Great article. Thanks Sign In·View Thread·PermaLink 2.00/5 Great work [modified] hamo2008 7:37 23 May '06   It's a great work. I am developing a expression parser for this control and it can translate the formular expression（LaTex-like） to this great formula editor. For example, f(x)=x^2+\frac{1,x+\sigma} Another more complex example, following is the formula expression: s(x)=a\link x^2+b \link x+30 \n f(x)=x^2+\beta+\frac{x,1+\sqrt{x+\frac{1,3+x}}} \n g(x)=80.22\unit{mm} \n f(x)=\int_0^100{(2\cdot x^2+3\cdot x+10),x} \n g(x)=\sum{i=1,N,(x_i+sin(x+\pi/2))}+100 \n W_0=\frac{\gamma,2}\link\brac{2,(\cot{\omega_2}+ \tan{\alpha_2})\link H^2 +(\tan{\alpha_1}-\tan{\alpha_2})\link H^{2}_{1}} \n x=3\arrow{6}\brac{15,\bin{w=4,m=5}}\cdots{50}(8.29) more detail on http://www.ucosoft.com/archives/29.html ---- You have nothing to lose, but everything to gain. Welcome to www.ucosoft.com Sign In·View Thread·PermaLink 2.00/5 Thank u Keyvan Nayyeri 6:15 5 Jul '05   That's great article. Specially for someones like me whose deal with mathematics in their applications. Keyvan Nayyeri Website: www.keyvannayyeri.com Online community: www.nayyeri.net Sign In·View Thread·PermaLink First char uppercase Bruno Norberto 2:30 17 Feb '05   Does anybody knows how to prevent the in place edit from displaying the first char of a typed text in uppercase? Bruno Norberto Sign In·View Thread·PermaLink Re: First char uppercase Ramon Pardo 2:17 28 Jun '06   Hi Bruno, i found the problem. The control doesn't handle properly char codes in CFormulaCtrl::OnKeyDown function. The last "if" sentence of that function is: if(pNode->GetEditMode() & NE_ALLOWEDIT) { pNode->SetEditMode(pNode->GetEditMode() | NE_INEDITMODE); DWORD dwStyle = ES_CENTER; CRect rectEdit=TransformRect(pNode->m_NodeRect); m_pEditWnd = new CFormulaInPlaceEdit(this, rectEdit, dwStyle, IDC_INPLACE_CONTROL, pNode, pNode->GetShortCut(), nChar2); } and should be if(pNode->GetEditMode() & NE_ALLOWEDIT) { pNode->SetEditMode(pNode->GetEditMode() | NE_INEDITMODE); DWORD dwStyle = ES_CENTER; CRect rectEdit=TransformRect(pNode->m_NodeRect); BYTE keyState[256]; memset(keyState, 0, 256); ::GetKeyboardState((BYTE*)keyState); WORD nChar2 = 0; if(::ToAscii(nChar, 0, (BYTE*)keyState, &nChar2, 0) == 1) { m_pEditWnd = new CFormulaInPlaceEdit( this, rectEdit, dwStyle, IDC_INPLACE_CONTROL, pNode, pNode->GetShortCut(), nChar2); } } This works for me. Cheers, Ramón Pardo Sign In·View Thread·PermaLink 4.00/5 Great control AliRafiee 15:26 18 Jan '05   I just wish that the output data wasn't dependent on CObject. I need to develop this same control, and a Mac equivalent, and exchange data between the two. Sign In·View Thread·PermaLink 1.00/5 And & Or Bruno Norberto 10:50 29 Jul '04   How could I write a CAndNode and a COrNode for boolean expressions like: ( A > B ) && ( C == D ) ? Did anybody already write these? Bruno Norberto Sign In·View Thread·PermaLink 2.00/5 Re: And & Or Bruno Norberto 5:58 31 Aug '04   Nevermind... i figured it out Bruno Norberto Sign In·View Thread·PermaLink request! some_one_1 23:01 6 May '04   it's a fain working prog.I am very interested in developing a similar project but in other domain than math,may you send me by email some other documentation's about de prog, like some uml design's or explanation about de subalgorithm's.Thanck you. i wait for your reply at Amadeo_BEI@personal.ro. thanck's again! Sign In·View Thread·PermaLink Re: request! cherish 22:10 8 Aug '04   I want to get those documents ,please send me a mail too. Thanks a lot ! www.cherishSoft.com Thanks! Sign In·View Thread·PermaLink EXCELLENT! boon313 2:14 30 Mar '04   I have never seen anything like this before. Excellent piece of work! Sign In·View Thread·PermaLink Some questions, please help me !! cherish 16:54 17 Dec '03   I complie the program, but it has some errors. Example: m_straShortCuts.Add("?); and m_strShortCut="?; and m_straShortCuts.Add("鬃?) and m_straShortCuts.Add("蝌?) and m_straShortCuts.Add("|?); other is similar. What are these errors meaning , how to solve? Please give me a help ,thanks at first. cherish William Sign In·View Thread·PermaLink 1.00/5 Re: Some questions, please help me !! cherish 18:11 18 Dec '03   No person tell me why ? The symbol means what?? Thanks a lot!! cherish William Sign In·View Thread·PermaLink 2.00/5 Re: Some questions, please help me !! Anonymous 23:22 4 Jan '04   I meet the same thing, can not know how to solve it Sign In·View Thread·PermaLink Re: Some questions, please help me !! cherish 2:28 12 Jan '04   If someone can compile it, please tell us , thanks a lot!! Sign In·View Thread·PermaLink Re: Some questions, please help me !! tbw 23:47 15 Jan '04   The formula-editor is not tested with unicode. The constructors of the nodeentities use some characters, that are dircetly copied from the symbol-charset (to supply for example special kind of braces). I think these characters are the problem. Please send me the output of your compiler including the errors. Maybe I can find a solution... tbw Sign In·View Thread·PermaLink 3.25/5 Re: Some questions, please help me !! Xiaopf 17:10 20 Jan '06   These errors,can you fix it? thank you! \formulactrl_src\projekte\FormulaDlg\nodeentities.cpp(350) : error C2146: syntax error : missing ';' before identifier 'm_strName' \formulactrl_src\projekte\FormulaDlg\nodeentities.cpp(424) : error C2001: newline in constant \formulactrl_src\projekte\FormulaDlg\nodeentities.cpp(425) : error C2146: syntax error : missing ';' before identifier 'm_strName' \formulactrl_src\projekte\FormulaDlg\nodeentities.cpp(589) : error C2001: newline in constant \formulactrl_src\projekte\FormulaDlg\nodeentities.cpp(590) : error C2146: syntax error : missing ')' before identifier 'm_straFontNames' \formulactrl_src\projekte\FormulaDlg\nodeentities.cpp(599) : error C2001: newline in constant \formulactrl_src\projekte\FormulaDlg\nodeentities.cpp(600) : error C2146: syntax error : missing ')' before identifier 'm_straFontNames' \formulactrl_src\projekte\FormulaDlg\nodeentities.cpp(701) : error C2001: newline in constant \formulactrl_src\projekte\FormulaDlg\nodeentities.cpp(702) : error C2146: syntax error : missing ')' before identifier 'm_straFontNames' \formulactrl_src\projekte\FormulaDlg\nodeentities.cpp(705) : error C2001: newline in constant Sign In·View Thread·PermaLink 2.00/5 Re: Some questions, please help me !! Prosperb 11:28 5 Apr '07   This probably has to do with the namespace for your section of code not being used properly. Make sure you include the header file that defines the namespace of the code that you are about to call, and then write the line "using namespace nnnn;". The 3 things must be in this particular order. For example: #include "ou_thread.h" using namespace openutils; // my code that uses the namespaced classes defined in the header file pp Sign In·View Thread·PermaLink 5.00/5 My Error is same~! Yails 21:38 6 Jun '06   Can you re-compress the package? Please~ Sign In·View Thread·PermaLink 2.50/5 Great work! dswigger 9:19 4 Dec '03   The control really is impressive - I am looking forward to letting a friend of mine play around with it. Sign In·View Thread·PermaLink 2.00/5 Great - but some errors when compiling for VC.NET Alexandru Savescu 4:46 10 Jun '03   Hello, Your control looks amazing. However, I tried to build it with .NET and encountered the following errors: Compiling... ColourPopup.cpp c:\Alex\CodeProject\FormulaCtrl\projekte\FormulaDlg\ColourPopup.cpp(230) : error C2440: 'static_cast' : cannot convert from 'void (__thiscall CColourPopup::* )(BOOL,HTASK)' to 'void (__thiscall CWnd::* )(BOOL,DWORD)' None of the functions with this name in scope match the target type c:\Alex\CodeProject\FormulaCtrl\projekte\FormulaDlg\ColourPopup.cpp(908) : error C2664: 'CWnd::OnActivateApp' : cannot convert parameter 2 from 'HTASK' to 'DWORD' This conversion requires a reinterpret_cast, a C-style cast or function-style cast I reckon you should update your ColourPopup control. Keep up the good work! Best regards, Alexandru Savescu P.S. Interested in art? Visit this! Sign In·View Thread·PermaLink Re: Great - but some errors when compiling for VC.NET SohailB 21:57 29 Mar '05   Just change the HTASK in those two lines to DWORD and everything runs OK. Its a really great job Sign In·View Thread·PermaLink Great! Doan Quang Minh 18:36 31 May '03   This 's great job. Love! Never say Goodbye! Sign In·View Thread·PermaLink 5.00/5

Last Visit: 12:57 12 Mar '10     Last Update: 12:57 12 Mar '10 1234 Next »