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   <TITLE>Controls - Histogram Control</TITLE>
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<CENTER><H3><FONT COLOR="#AOAO99">
Histogram Control
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This article was contributed by <A HREF="mailto:klen@bellatlantic.net">Ken C. Len</A>.

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<IMG SRC="histogram_control1.gif" height="118" width="376" alt="histogram control">
&nbsp;<A HREF="histogram_control.zip">Download Source Code and Example</A>
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<p>
This custom control displays a left scrolling spike with range configurable
by calling SetRange(0,100), the first parameter is the min(bottom) value and the
second parameter is max(top) value.
  
<p>The control is designed to work just like the progress control but with a twist. Every
SetPos() will shows a spike and the next SetPos() will scroll the previous one to the left.
  
<p>The CHistogramCtrl class is derived from CWnd, the header and code are in HistogramCtrl.h
and HistogramCtrl.cpp files.
  
<h4>Important</h4>
<p>In your dialog box, you must create the control as static control (use "picture" from control toolbar).
You must set the properties to 

<ul>  
<li>Type: Rectangle, and 
<li>Color: black. (I think black background looks better)
</ul>
  
<p>Don't worry about the height, width and border, the control will ajust itself and draw the border for you.
  
<p>First add a member to your dialog class like this:

<FONT COLOR="#990000"><TT><PRE>
class CHistogramTestDlg : public CDialog
{
...
// Implementation
protected:
	CHistogramCtrl m_HistogramCtrl;
...
};
</tt></PRE></FONT>
  
<p>And in the initial dialog box...
  
<FONT COLOR="#990000"><TT><PRE>
BOOL CHistogramTestDlg::OnInitDialog()
{
	CDialog::OnInitDialog();
	...

	CRect rect;
	GetDlgItem(IDC_STATIC_HISTOGRAM)->GetWindowRect(rect);
	ScreenToClient(rect);

	m_HistogramCtrl.Create(WS_VISIBLE | WS_CHILD, rect, this, 100);
	m_HistogramCtrl.SetRange(0,100);
  
	return TRUE;  // return TRUE  unless you set the focus to a control
}
</tt></PRE></FONT>

<p>And the rest use SetPos(UINT nValue).
  
<p>The custom control uses unique painting technique which is a little bit to long
to discuss here. If you want to understand more please email your FAQ to
klen@bellatlantic.net thanks. (The code is not as long to read)
  
<p>Here is an example of how an application looks like with the control.
<p><IMG SRC="histogram_control2.gif" height="553" width="324" alt="histogram control">
 
  
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<p>Last updated: 17 May 1998

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<TD WIDTH="34%"><DIV ALIGN=right><FONT SIZE=-1>Contact me: <A HREF="mailto:zafir@home.com">zafir@home.com</A>&nbsp;</FONT></DIV></TD>
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