CStatic-derived histogram control

Alexander Fedorov

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9 Jan 2000

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A simple histogram control for displaying data

Download demo project - 20 Kb

Download source files - 2 Kb

The CAlexfStaticHistogram control is a lightweight class suitable for displaying histograms. You can add new columns, additional text, change text orientation and direction of motion (if you change data at runtime).

Using CAlexfStaticHistogram in a dialog is quite simple:

Include CAlexfStaticHistogram.h in your dialog class' header file.
Add member variables of type CAlexfStaticHistogram for every static text control you want to subclass.
Subclass the static text controls in your dialog's OnInitDialog() method and set the controls' style.

m_sHistogram.SetTextWidth(50); // Set text width (0 - no text)
m_sHistogram.SetTextLines(5);  // Set number of text lines (0 - none)
m_sHistogram.text[0] = "Z1";   // Set text (too easy to create special
m_sHistogram.text[1] = "Zz2";  // function for that)
// ...
m_sHistogram.SetMaxValue(99.9) // Set relatival maximum
m_sHistogram.Add(50);          // Add new column to histogram

If you want "dynamic" histogram - you can owerride, for example, OnTimer() and simply call:

m_sHistogram.Add(/*Value*/);

Please feel free to send me any suggestions about this control.

License

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Written By

Alexander Fedorov

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Russian Federation

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Comments and Discussions

I tried sending this to the author but the included email address is no longer in existance.

Basically, i added color and changed the offset to cover more of the control properly.

Here is the cpp file.

/////////////////////////////////////////////////////////////////////////////
// Copyright (C) 1999 by Alexander Fedorov
// All rights reserved
//
// Distribute and use freely, except:
// 1. Don't alter or remove this notice.
// 2. Mark the changes you made
//
// Send bug reports, bug fixes, enhancements, requests, etc. to:
//    alexander.fedorov@usa.net
// updated by FNA - Fred Ackers - aqiruse@gmail.com
/////////////////////////////////////////////////////////////////////////////

// AlexfStaticHistogram.cpp : implementation file

#include "stdafx.h"
#include "AlexfStaticHistogram.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAlexfStaticHistogram

CAlexfStaticHistogram::CAlexfStaticHistogram()
{
	m_bOK = FALSE;
	m_lTextLines = 0;
	m_lTextWidth = 0;
	m_lStack = 0;
	m_dMaxValue = 100;
	m_bTextLeft = TRUE;
	m_bNeedFullRedraw = FALSE;
	m_bMotionLToR = TRUE;
	m_clr = GetSysColor(COLOR_BTNHIGHLIGHT);//FNA
	m_clrBack = GetSysColor(COLOR_BTNFACE); //FNA

	m_lArraySize = GetSystemMetrics(SM_CXSCREEN);
	m_pdArray = new DOUBLE[m_lArraySize];
	if (!m_pdArray) return;
	ZeroMemory(m_pdArray, m_lArraySize * sizeof(DOUBLE));
	m_bOK = TRUE;
}

CAlexfStaticHistogram::~CAlexfStaticHistogram()
{
	if (m_pdArray) delete [] m_pdArray;
}


BEGIN_MESSAGE_MAP(CAlexfStaticHistogram, CStatic)
	//{{AFX_MSG_MAP(CAlexfStaticHistogram)
	ON_WM_PAINT()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CAlexfStaticHistogram message handlers

void CAlexfStaticHistogram::OnPaint() 
{
	if (!m_bOK)
	{
		CStatic::OnPaint();
		return;
	}
	CPaintDC dc(this); // device context for painting
	CRect cr;
	GetClientRect(&cr);
	if (m_bNeedFullRedraw)
	{
		m_bNeedFullRedraw = FALSE;
		dc.FillRect(cr, & CBrush(GetSysColor(COLOR_BTNFACE)));
	}
	CRect cr1(cr);
	if (m_bTextLeft) cr1.right = cr1.left + m_lTextWidth;
	else cr1.left = cr1.right - m_lTextWidth;
// text
	dc.SetBkMode(TRANSPARENT);
	dc.SetTextColor(GetSysColor(COLOR_BTNTEXT));
	int hh = 0;
	if (m_lTextLines != 0) hh = cr.Height() / m_lTextLines;
	cr1.right = cr1.left + m_lTextWidth;
	dc.FillRect(cr1, & CBrush(GetSysColor(COLOR_BTNFACE)));
	cr1.bottom = cr1.top + hh;
	CFont* pOldFont = dc.SelectObject(GetFont());
	int i = 0;//FNA - fix for VS2005
	for (i = 0; i < m_lTextLines; i++)
	{
		dc.DrawText(text[i], (LPRECT)&cr1,
		DT_WORDBREAK | DT_CENTER | DT_VCENTER);
		cr1.OffsetRect(0, hh);
	}
	dc.SelectObject(pOldFont);
// graph
	if (m_dMaxValue == 0) return;
	if (m_bTextLeft) cr.left += m_lTextWidth;
	else cr.right -= m_lTextWidth;
	cr1 = cr;
	if (m_bMotionLToR) cr1.right = cr1.left + 2;
	else cr1.left = cr1.right - 2;
	i = m_lStack;
	cr1.bottom -= 1;
	int h = cr.Height() - 2;
	int nOffset = (int)((cr.right-cr.left)/m_lStack+0.5f);//FNA - Changed Offset to display in as much of full space as possible
	while (TRUE)
	{
		int h1 = 0;
		if (m_dMaxValue != 0) h1 = (int)((DOUBLE) h * m_pdArray[i] / m_dMaxValue);
		if (h1 > h) h1 = h;
		cr1.top = cr.top;
		cr1.bottom = cr.bottom - h1;
		dc.FillRect(cr1, & CBrush(m_clrBack));
		cr1.top = cr.bottom - h1;
		cr1.bottom = cr.bottom;
		dc.FillRect(cr1, & CBrush(m_clr));//FNA - Changed to custom Color
		if (m_bMotionLToR) cr1.OffsetRect(nOffset+(i%1?1:0), 0);//FNA - Changed Offset to display in as much of full space as possible
		else cr1.OffsetRect(-(nOffset+(i%1?1:0)), 0);//FNA - Changed Offset to display in as much of full space as possible
		if (i == 0) break;//FNA - was looping infinitely with new offset
		i--;
		if (m_bMotionLToR)
		{
			if (cr1.left > cr.right - 3) break;
		}
		else
		{
			if (cr1.left < cr.left) break;
		}
	}
	// Do not call CStatic::OnPaint() for painting messages
}

BOOL CAlexfStaticHistogram::Add(DOUBLE dValue)
{
	if (!m_bOK) return FALSE;
	m_lStack++;
	if (m_lStack >= m_lArraySize) m_lStack = 0;
	m_pdArray[m_lStack] = dValue;
	RedrawWindow();
	return TRUE;
}

BOOL CAlexfStaticHistogram::SetTextLeft(BOOL bSet)
{
	if (!m_bOK) return FALSE;
	m_bTextLeft = bSet;
	m_bNeedFullRedraw = TRUE;
	RedrawWindow();
	return TRUE;
}

BOOL CAlexfStaticHistogram::SetTextWidth(LONG lWidth)
{
	if (!m_bOK) return FALSE;
	m_lTextWidth = lWidth;
	m_bNeedFullRedraw = TRUE;
	RedrawWindow();
	return TRUE;
}

BOOL CAlexfStaticHistogram::SetTextLines(LONG lLines)
{
	if (!m_bOK) return FALSE;
	m_lTextLines = lLines;
	m_bNeedFullRedraw = TRUE;
	RedrawWindow();
	return TRUE;
}

BOOL CAlexfStaticHistogram::SetMotionLtoR(BOOL bSet)
{
	if (!m_bOK) return FALSE;
	m_bMotionLToR = bSet;
	m_bNeedFullRedraw = TRUE;
	RedrawWindow();
	return TRUE;
}

BOOL CAlexfStaticHistogram::SetMaxValue(DOUBLE dValue)
{
	if (!m_bOK) return FALSE;
	m_dMaxValue = dValue;
	m_bNeedFullRedraw = TRUE;
	RedrawWindow();
	return TRUE;
}

And here is the header file:

/////////////////////////////////////////////////////////////////////////////
// Copyright (C) 1999 by Alexander Fedorov
// All rights reserved
//
// Distribute and use freely, except:
// 1. Don't alter or remove this notice.
// 2. Mark the changes you made
//
// Send bug reports, bug fixes, enhancements, requests, etc. to:
//    alexander.fedorov@usa.net
/////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_ALEXFSTATICHISTOGRAM_H__EE1F7AD3_2661_11D3_9865_868E4C4284CA__INCLUDED_)
#define AFX_ALEXFSTATICHISTOGRAM_H__EE1F7AD3_2661_11D3_9865_868E4C4284CA__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// AlexfStaticHistogram.h : header file
//

/////////////////////////////////////////////////////////////////////////////
// CAlexfStaticHistogram window

class CAlexfStaticHistogram : public CStatic
{
// Construction
public:
	CAlexfStaticHistogram();

// Attributes
public:

// Operations
public:

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAlexfStaticHistogram)
	//}}AFX_VIRTUAL

// Implementation
public:
	BOOL Add(DOUBLE dValue);
	BOOL IsOK() {return m_bOK;}
	BOOL SetTextLeft(BOOL bSet = TRUE);
	BOOL SetMotionLtoR(BOOL bSet = TRUE);
	BOOL SetTextWidth(LONG lWidth);
	BOOL SetTextLines(LONG lLines);
	BOOL SetMaxValue(DOUBLE dValue);
	void SetColor(COLORREF clr) { m_clr = clr; }//FNA
	void SetBackColor(COLORREF clr) { m_clrBack = clr; }//FNA
	CString text[10];		// text strings
	virtual ~CAlexfStaticHistogram();

	// Generated message map functions
protected:
	COLORREF m_clr;
	COLORREF m_clrBack;
	BOOL m_bOK;				// control operational
    LONG m_lTextLines;		// number of text lines
	LONG m_lTextWidth;		// width of text field
    LONG m_lStack;
    DOUBLE m_dMaxValue;		// maximum value
    DOUBLE * m_pdArray;		// array of values
    LONG m_lArraySize;		// array size
	BOOL m_bTextLeft;		// text placed at ledt corner
	BOOL m_bNeedFullRedraw;	//
	BOOL m_bMotionLToR;		// motion from left to right


	//{{AFX_MSG(CAlexfStaticHistogram)
	afx_msg void OnPaint();
	//}}AFX_MSG

	DECLARE_MESSAGE_MAP()
};

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_ALEXFSTATICHISTOGRAM_H__EE1F7AD3_2661_11D3_9865_868E4C4284CA__INCLUDED_)

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