NSChart Control



Introduction

The CNSChartCtrl control class is derived from CWnd. The purpose is to create pie and bar charts in a dialog (also in a view) with editable fill colors and values in runtime. Originally, the source code and project was written and compiled with Visual C++ 6.0 SP5 under Windows 98; it also was run in later versions.

It is an alternative to many tools available that perform similar tasks.

How to Use the Class

  1. To create a new NSChart control, use the MS Visual C++ dialog editor, insert a custom control on the dialog, and set "MFC_NSChartCtrl" as the Class name. The caption field is used to set the title of chart.

  2. Create an instance of CNSChartCtrl in the dialog class:
  3. #include "NSChartCtrl.h"
    ...
    CNSChartCtrl m_chart;
    
  4. Subclass the class member with the control in InitDialog():
  5. m_chart.SubclassDlgItem(IDC_CUSTOM1,this);
  6. Initialize the control colors and add the elements in the InitDialog() function, if any,
  7. m_chart.PrepareColors(CNSChartCtrl::GrayScale);    //Colors
    m_chart.AddValue(10,"One");
    m_chart.AddValue(20,"Two");
    m_chart.AddValue(90,"Three");
    m_chart.AddValue(30,"Four");
    m_chart.Addvalue(40,"Five");
    m_chart.AddValue(20,"Six");
    
    Currently, two groups of pre-established colors exist: SimpleColos and GrayScale... you can customize this.

  8. Run!

Customizing Colors and Patterns

The NSChart control uses an array of patterns to fill the sectors and bars. To add a new pattern or color, use AddSolidBrush(COLORREF) or AddBrush(COLORREF).

m_chart.ResetColors();
m_chart.AddSolidBrush(0x000000FF);
m_chart.AddSolidBrush(RGB(255,0,255));
m_chart.AddBrush(m_pBrush);    // pre-created brush

Using the Notify Code for Selection Items

The NSChartCtrl notifies you when you have clicked in one sector or bar (according to the case) with information about the selected value. The notify code is NSCS_SELECTEDITEM.

For use, it needs to add the necessary code: Declare the function that will be called from ON_NOTIFY in the AFX_MSG block.

class CYourDialog : public CDialog
{
   ...
      //{{AFX_MSG(CYourDialog)
      ...
      afx_msg void OnChartSelectedItem(NMHDR* pNMHDR, LRESULT* pResult);
      ...
      //}}AFX_MSG
   ...
};
void CYourDialog::OnChartSelectedItem(NMHDR* pNMHDR, LRESULT* pResult)
{
   LPNMCHARTCTRL nmchart = (LPNMCHARTCTRL)pNMHDR;
   if(nmchart->iItem >= 0 )
   {
      //... have selected item
   }
   *pResult = FALSE;
}

Declare the notify message in MESSAGE_MAP block:

BEGIN_MESSAGE_MAP(CYourDialog, CDialog )
   //{{AFX_MSG_MAP(CYourDialog)
   ...
   ON_NOTIFY(NSCS_SELECTEDITEM, IDC_CUSTOM_CTRL, OnChartSelectedItem)
   ...
END_MESSAGE_MAP()

If the control is created in a CView, change IDC_CUSTOM_CTRL with 0.

History

1.0.1   25 Jun 2004
   - Initial release.
1.1.0   02 Aug 2004
   - Fix some painting problems.
   - Added HitTest().
   - Added ModifyItem().
   - Added DeleteItem().
   - Added Notify Messages

Any comments or suggestions are welcome.



About the Author

Ivan Cachicatari

Ivan Cachicatari is founder of Latindevelopers.com/ community.

Downloads

Comments

  • How to work in Windows Form?

    Posted by kayss on 09/09/2007 01:07pm

    Hello, IB4m try to use this header file in my Windows Form proyect, how I can to do this? Tanks, kayss (juan.sanchez.margallo@gmail.com)

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Packaged application development teams frequently operate with limited testing environments due to time and labor constraints. By virtualizing the entire application stack, packaged application development teams can deliver business results faster, at higher quality, and with lower risk.

  • Agile methodologies give development and test teams the ability to build software at a faster rate than ever before. Combining DevOps with hybrid cloud architectures give teams not just the principles, but also the technology necessary to achieve their goals. By combining hybrid cloud and DevOps: IT departments maintain control, visibility, and security Dev/test teams remain agile and collaborative Organizational barriers are broken down Innovation and automation can thrive Download this white paper to …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds