graphctrl.cpp

wince图形界面的开发

/************************************************************************************
File Name		:	GraphCtrl.cpp

Class Name		:	MECGraphCtrl

Description		:	This file contains the functionalites for the Graph

Developed by	:	B.Manivannan

Date			:	24-10-2001
*************************************************************************************/
#include "stdafx.h"
#include "resource.h"
#include "GraphCtrl.h"

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

/************************************************************************************
Function Name	:	MECGraphCtrl

Class Name		:	MECGraphCtrl

Description		:	This constructor initialises the attributes

Argument		:	Nothing

Return type		:	void
*************************************************************************************/

MECGraphCtrl::MECGraphCtrl()
{
	m_nLastIndexPoint = 0;
	m_nYDecimals = 0 ;
	m_nXDecimals = 0 ;

    m_dLowerLimit = 0 ;
	m_dUpperLimit =  100 ;
	m_dRange      =  m_dUpperLimit - m_dLowerLimit ;   // protected member variable

	m_dXLower = 0 ;
	m_dXUpper =  100 ;
	m_XRange      =  m_dXUpper - m_dXLower;   // protected member variable

	// background, grid and data colors
	// these are public variables and can be set directly
	m_crBackColor  = RGB(  0,   0,   0) ;  // see also SetBackgroundColor
	m_crGridColor  = RGB(  0, 255, 255) ;  // see also SetGridColor
	m_crPlotColor  = RGB(255, 255, 255) ;  // see also SetPlotColor

	// protected variables
	m_penPlot.CreatePen(PS_SOLID, 0, m_crPlotColor) ;
	m_brushBack.CreateSolidBrush(m_crBackColor) ;

	// public member variables, can be set directly 
	m_strXUnitsString.Format(_T("Time in seconds")) ;  // can also be set with SetXUnits
  
	// protected bitmaps to restore the memory DC's
	m_pbitmapOldGrid = NULL ;
	m_pbitmapOldPlot = NULL ;
}

MECGraphCtrl::~MECGraphCtrl()
{
}


BEGIN_MESSAGE_MAP(MECGraphCtrl, CWnd)
	//{{AFX_MSG_MAP(MECGraphCtrl)
	ON_WM_SIZE()
	ON_WM_PAINT()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/************************************************************************************
Function Name	:	AppendPoint

Class Name		:	MECGraphCtrl

Description		:	It is appending the points to the graph. It is being called from the OnInitDialog

Argument		:	double dPointX, double dPointY

Return			:	Nothing
*************************************************************************************/
void MECGraphCtrl::AppendPoint(double dPointX, double dPointY)
{
	m_oNewPoint.x = dPointX;
	m_oNewPoint.y = dPointY;

	m_oPoints[m_nLastIndexPoint].x = m_oNewPoint.x;
	m_oPoints[m_nLastIndexPoint].y = m_oNewPoint.y;
	
	DrawPoints();

	m_nLastIndexPoint++;

	Invalidate();
}
/************************************************************************************
Function Name	:	DrawPoints

Class Name		:	MECGraphCtrl

Description		:	It draws the curve to given points and identify the proper pixels

Argument		:	Nothing

Return			:	Nothing
*************************************************************************************/
void MECGraphCtrl::DrawPoints()
{
  CPen *oldPen ;
  CRect rectCleanUp ;

  if (m_dcPlot.GetSafeHdc() != NULL)
  {
    
    m_dcPlot.BitBlt(m_rectPlot.left, m_rectPlot.top+1, 
                    m_nPlotWidth, m_nPlotHeight, &m_dcPlot, 
                    m_rectPlot.left, m_rectPlot.top+1, 
                    SRCCOPY) ;

    // fill the cleanup area with the background
    m_dcPlot.FillRect(rectCleanUp, &m_brushBack) ;

    // draw the next line segement

    // grab the plotting pen
    oldPen = m_dcPlot.SelectObject(&m_penPlot) ;
	
	if(m_nLastIndexPoint == 0)
	{
		int nXOrigin = m_rectPlot.left  ;
		int nYOrigin = m_rectPlot.bottom ;
		m_dcPlot.MoveTo (nXOrigin, nYOrigin) ;

		m_dPoints[m_nLastIndexPoint].x = m_rectPlot.left+(long)((m_oPoints[m_nLastIndexPoint].x - m_dXLower) * m_dHorizontalFactor) ; 
		m_dPoints[m_nLastIndexPoint].y = m_rectPlot.bottom - 
            (long)((m_oPoints[m_nLastIndexPoint].y - m_dLowerLimit) * m_dVerticalFactor) ;

		m_dcPlot.LineTo ((int)m_dPoints[m_nLastIndexPoint].x, (int)m_dPoints[m_nLastIndexPoint].y) ;
	}
	else
	{
		if (m_dPoints[m_nLastIndexPoint].x >= m_rectPlot.left)
			m_dcPlot.MoveTo ((int)m_dPoints[m_nLastIndexPoint-1].x, (int)m_dPoints[m_nLastIndexPoint-1].y) ;
		m_dPoints[m_nLastIndexPoint].x = m_rectPlot.left+(long)((m_oPoints[m_nLastIndexPoint-1].x - m_dXLower) * m_dHorizontalFactor) ; 
		m_dPoints[m_nLastIndexPoint].y = m_rectPlot.bottom - 
            (long)((m_oPoints[m_nLastIndexPoint-1].y - m_dLowerLimit) * m_dVerticalFactor) ;
		if (m_dPoints[m_nLastIndexPoint].x >= m_rectPlot.left)
			m_dcPlot.LineTo ((int)m_dPoints[m_nLastIndexPoint].x, (int)m_dPoints[m_nLastIndexPoint].y) ;
	}
	
	if ((m_dPoints[m_nLastIndexPoint-1].y <= m_rectPlot.top) || (m_dPoints[m_nLastIndexPoint].y <= m_rectPlot.top))
      m_dcPlot.FillRect(CRect((int)m_dPoints[m_nLastIndexPoint].x, m_rectClient.top, (int)m_dPoints[m_nLastIndexPoint].x+1, m_rectPlot.top+1), &m_brushBack) ;

    if ((m_dPoints[m_nLastIndexPoint-1].y >= m_rectPlot.bottom) || (m_dPoints[m_nLastIndexPoint].y >= m_rectPlot.bottom))
      m_dcPlot.FillRect(CRect((int)m_dPoints[m_nLastIndexPoint].x, m_rectPlot.bottom+1, (int)m_dPoints[m_nLastIndexPoint].x+1, m_rectClient.bottom+1), &m_brushBack) ;

    // restore the pen 
    m_dcPlot.SelectObject(oldPen) ;
  }
}
/************************************************************************************
Function Name	:	InvalidateCtrl

Class Name		:	MECGraphCtrl

Description		:	Redraws all the points. It can be called from any function

Argument		:	Nothing

Return			:	Nothing
*************************************************************************************/
void MECGraphCtrl::InvalidateCtrl()
{

	int nCharacters ;

	CPen *oldPen ;
	CPen solidPen(PS_SOLID, 0, m_crGridColor) ;
	CFont axisFont, yUnitFont, *oldFont ;
	CString strTemp ;

	// in case we haven't established the memory dc's
	CClientDC dc(this) ;  

	// if we don't have one yet, set up a memory dc for the grid
	if (m_dcGrid.GetSafeHdc() == NULL)
	{
		m_dcGrid.CreateCompatibleDC(&dc) ;
		m_bitmapGrid.CreateCompatibleBitmap(&dc, m_nClientWidth, m_nClientHeight) ;
		m_pbitmapOldGrid = m_dcGrid.SelectObject(&m_bitmapGrid) ;
	}
  
	m_dcGrid.SetBkColor (m_crBackColor) ;

	// fill the grid background
	m_dcGrid.FillRect(m_rectClient, &m_brushBack) ;

	// draw the plot rectangle:
	// determine how wide the y axis scaling values are
	  nCharacters = abs((int)log10(fabs(m_dUpperLimit))) ;
	  nCharacters = max(nCharacters, abs((int)log10(fabs(m_dLowerLimit)))) ;

	  // add the units digit, decimal point and a minus sign, and an extra space
	  // as well as the number of decimal places to display
	  nCharacters = nCharacters + 4 + m_nYDecimals ;  

	  // adjust the plot rectangle dimensions
	  // assume 6 pixels per character (this may need to be adjusted)
	  m_rectPlot.left = m_rectClient.left + 6*(nCharacters) ;
	  m_nPlotWidth    = m_rectPlot.Width() ;

	  // draw the plot rectangle
	  oldPen = m_dcGrid.SelectObject (&solidPen) ; 
	  m_dcGrid.MoveTo (m_rectPlot.left, m_rectPlot.top) ;
	  m_dcGrid.LineTo (m_rectPlot.right+1, m_rectPlot.top) ;
	  m_dcGrid.LineTo (m_rectPlot.right+1, m_rectPlot.bottom+1) ;
	  m_dcGrid.LineTo (m_rectPlot.left, m_rectPlot.bottom+1) ;
	  m_dcGrid.LineTo (m_rectPlot.left, m_rectPlot.top) ;
	  m_dcGrid.SelectObject (oldPen) ;
	  
	  yUnitFont.CreateFont (14, 0, 900, 0, 300,
                       FALSE, FALSE, 0, ANSI_CHARSET,
                       OUT_DEFAULT_PRECIS, 
                       CLIP_DEFAULT_PRECIS,
                       DEFAULT_QUALITY, 
                       DEFAULT_PITCH|FF_SWISS, _T("Arial")) ;
	  axisFont.CreateFont (14, 0, 0, 0, 300,
                       FALSE, FALSE, 0, ANSI_CHARSET,
                       OUT_DEFAULT_PRECIS, 
                       CLIP_DEFAULT_PRECIS,
                       DEFAULT_QUALITY, 
                       DEFAULT_PITCH|FF_SWISS, _T("Arial")) ;
  
  
		// grab the horizontal font
	  oldFont = m_dcGrid.SelectObject(&axisFont) ;

	  
  
  // y max
  m_dcGrid.SetTextColor (m_crGridColor) ;
  strTemp.Format (_T("%.*lf"), m_nYDecimals, m_dUpperLimit) ;
  int nYMaxLength = strTemp.GetLength();
  if(m_nYDecimals == 2)
	m_dcGrid.ExtTextOut(m_rectPlot.left-30,m_rectPlot.top,ETO_CLIPPED|ETO_OPAQUE,NULL,strTemp,nYMaxLength,NULL);

  // y min
  strTemp.Format (_T("%.*lf"), m_nYDecimals, m_dLowerLimit) ;
  nYMaxLength = strTemp.GetLength();
  if(m_nYDecimals == 2)
	m_dcGrid.ExtTextOut(m_rectPlot.left-30, m_rectPlot.bottom -10,ETO_CLIPPED|ETO_OPAQUE,NULL,strTemp,nYMaxLength,NULL);

  strTemp.Format (_T("%.*lf"), m_nXDecimals, m_dXLower) ;
  nYMaxLength = strTemp.GetLength();
  m_dcGrid.ExtTextOut(m_rectPlot.left,m_rectPlot.bottom+4,ETO_CLIPPED,NULL,strTemp,nYMaxLength,NULL);

  // x max
  strTemp.Format (_T("%.*lf"), m_nXDecimals, m_dXUpper) ;
  nYMaxLength = strTemp.GetLength();
  m_dcGrid.ExtTextOut(m_rectPlot.right-25,m_rectPlot.bottom+4,ETO_CLIPPED,NULL,strTemp,nYMaxLength,NULL);