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Posted 13 Nov 2001

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Real Time 2D Graph for CE

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3.20/5 (4 votes)
13 Nov 2001CPOL1 min read
A 2D graph for CE. To run this application, you must have installed eMbedded Visual C++ 3.0.

Sample Image - Graph.jpg

Introduction

This article is for developing 2D Real Time Graphs. I was searching the net to develop the graph as shown above. I found that the picture control had been used to draw the graph in Microsoft Visual Studio. To develop this application, I needed to use the Microsoft eMbedded Visual C++ 3.0.

Historically, I've shown "live" Instrument readings through the constant updating of a numerical value by using constant value array. The Graph shows the real time data from the instrument

This MECGraphCtrl is based on the bitmap repainting concept used in Mark C. Malburg. It provides significant enhancements through the display of scaling information and plotting of double precision values. The user implementation is described below.

In the control's owner (for example, dialog) insert a dummy picture control. Size the Custom Control border to be the desired size of the GraphCtrl. Name the control something that sounds technical, like "IDC_GRAPH_CUSTOM". In the property of the custom control, For class, write “GRAPH_CUSTOM”. This is the string for the class that should be registered in the Constructor of the Dialog class.

1. Insert the control in the owner class.

Add a member variable of type MECGraphCtrl.

class MECPerformerDlg : public CDialog
{
  // Construction
  ...
protected:
  static BOOL RegisterWndClass(HINSTANCE hInstance);
  MECGraphCtrl m_oGraphCtrl;  
}

2. Register the custom control.

BOOL MECPerformerDlg::OnInitDialog()
{
	WNDCLASS wc;
	wc.lpszClassName = _T("GRAPH_CUSTOM"); // matches class name 
	wc.hInstance = hInstance;
	wc.lpfnWndProc = ::DefWindowProc;
	//wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.hIcon = 0;
	wc.lpszMenuName = NULL;
	wc.hbrBackground = (HBRUSH) ::GetStockObject(LTGRAY_BRUSH);
	wc.style = CS_GLOBALCLASS; // To be modified
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
}

3. Create the control.

BOOL MECPerformerDlg::OnInitDialog()
{
	...
	CRect rect;
	GetDlgItem(IDC_GRAPH_CUSTOM)->GetWindowRect(rect) ;
	ScreenToClient(rect) ;
	GetDlgItem(IDC_GRAPH_CUSTOM)->ShowWindow(SW_HIDE);

	// create the control
	m_oGraphCtrl.Create(WS_VISIBLE | WS_CHILD, rect, this) ; 
	...
}

4. Personalize the Control

Set the vertical range, background color, grid color and plot color. 

BOOL MECPerformerDlg::OnInitDialog()
{
  ...
  // determine the rectangle for the control
  CRect rect;
  GetDlgItem(IDC_GRAPH_CUSTOM)->GetWindowRect(rect) ;
  ScreenToClient(rect) ;
  GetDlgItem(IDC_GRAPH_CUSTOM)->ShowWindow(SW_HIDE);

  // create the control
  m_oGraphCtrl.Create(WS_VISIBLE | WS_CHILD, rect, this) ; 
  m_oGraphCtrl.SetXRange(0,10,2);
  m_oGraphCtrl.SetRange(0, 10, 2) ;

  m_oGraphCtrl.SetYUnits("Volume in ml") ;
  m_oGraphCtrl.SetXUnits("Time in seconds") ;
  m_oGraphCtrl.SetBackgroundColor(RGB(0, 0, 64)) ;
  m_oGraphCtrl.SetGridColor(RGB(192, 192, 255)) ;
  m_oGraphCtrl.SetPlotColor(RGB(0, 255, 0)) ;
  ...
}

5. Use the control.

Call the m_oGraphCtrl.AppendPoint(nRandomX, nRandomY); function with the the data value to be appended to the plot.

Values can be modified to achieve different styles of displays.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

B.Manivannan
Web Developer
India India
I am basically from Salem, Tamilnadu, India. I have been working in Microsoft Visual C++ since October 1998. I have experienced in VC++ 6.0, eVC++ 3.0, SOCKETS, COM/DCOM. And having knowledge in MTS, COM+.

Comments and Discussions

 
GeneralCommercial uses Pin
holapepe15-Feb-10 4:07
Memberholapepe15-Feb-10 4:07 
Questionproblem in porting wince to smdk 2410 board. Pin
amiya das30-Mar-08 21:36
Memberamiya das30-Mar-08 21:36 
QuestionPort to CE 5 [modified] Pin
tiepvv8-Apr-07 21:55
Membertiepvv8-Apr-07 21:55 
QuestionAny MFC codes for this project? Pin
luckyfox16-Jun-06 21:46
Memberluckyfox16-Jun-06 21:46 
GeneralError Pin
Requiem Sollar22-Jul-05 12:28
MemberRequiem Sollar22-Jul-05 12:28 
QuestionHow can make exe for PcketPc Pin
mohsen_e_k9-May-05 1:47
Membermohsen_e_k9-May-05 1:47 
AnswerRe: How can make exe for PcketPc Pin
sudabeh15-Nov-05 1:16
Membersudabeh15-Nov-05 1:16 
Generalcan't linking program to exe file Pin
jonathan lau13-Apr-05 23:21
Memberjonathan lau13-Apr-05 23:21 
GeneralRe: can't linking program to exe file Pin
procket11-Oct-05 18:44
Memberprocket11-Oct-05 18:44 
GeneralRe: can't linking program to exe file Pin
sachin00221-Jun-06 18:32
Membersachin00221-Jun-06 18:32 
GeneralCompile error Pin
abimbolacole22-Feb-05 7:15
Memberabimbolacole22-Feb-05 7:15 
GeneralRegisterWndClass Pin
wheregone11-Dec-04 0:41
Memberwheregone11-Dec-04 0:41 
GeneralError Executing Link.Exe Pin
Lili2310-May-04 1:27
MemberLili2310-May-04 1:27 
GeneralRe: Error Executing Link.Exe Pin
ccarr9-Nov-04 14:43
Memberccarr9-Nov-04 14:43 
GeneralRe: Error Executing Link.Exe Pin
xtxd200224-Jul-05 21:53
Memberxtxd200224-Jul-05 21:53 
GeneralYou got my vote........ Pin
Darren_vms10-Feb-04 3:54
MemberDarren_vms10-Feb-04 3:54 
Questioncan u help me? Pin
pjp_eee19-Jan-04 0:01
susspjp_eee19-Jan-04 0:01 
AnswerRe: can u help me? Pin
Darren_vms12-Feb-04 2:35
MemberDarren_vms12-Feb-04 2:35 
GeneralClistViewCtrl with different colors for rows for wince Pin
Bilal Ahmad30-Nov-03 21:09
MemberBilal Ahmad30-Nov-03 21:09 
QuestionIs it working at all? Pin
11-Feb-02 1:17
suss11-Feb-02 1:17 
AnswerRe: Is it working at all? Pin
Stober17-Sep-03 4:46
MemberStober17-Sep-03 4:46 
GeneralGraph Control Pin
13-Jan-02 15:20
suss13-Jan-02 15:20 
GeneralRe: Graph Control Pin
garkhov_major11-Mar-05 4:30
Membergarkhov_major11-Mar-05 4:30 
GeneralNot run Pin
19-Dec-01 23:01
suss19-Dec-01 23:01 
QuestionHow about no MFC example Pin
Paul Gibson19-Nov-01 12:36
MemberPaul Gibson19-Nov-01 12:36 

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