2D Graph ActiveX Control

void CNTGraphCtrl::PlotElement(CDC *pDC)
{
	
	// If there is no data available for plot then return .
	if ( !nPlotIndex ) return ;
		
	CPen *oldPen , *pen;
	CBrush *oldBrush , *brush;
	CPoint pt;
	
	for(int i = 0 ; i < nElementCount ; i++) {

		// Added by A.Hofmann (Modified)
		//////////////////////////////////
		// Check show state of the element
		if ( mpElement[i].m_Type == 5 )
			continue;
		

		// Create the new pen as the color of serie 
		pen = new CPen(mpElement[i].m_Type, mpElement[i].m_Width, mpElement[i].m_Color);
		oldPen = pDC->SelectObject(pen) ; 

		// Create the new brush as the color of serie 
		brush = new CBrush(mpElement[i].m_Color);
		oldBrush = pDC->SelectObject(brush) ; 		
		

    	double x0,y0,x,y;
		x0=mpElement[i].dValueX[0];
        y0=mpElement[i].dValueY[0];
    
		// calculate the corrdinate of ploting point.
		pt = Corrdinate(x0,y0) ;
		pDC->MoveTo(pt);

		// Start plot all available data.
		for(int index = 1 ; index <= mpElement[i].m_nCount ; index++)
		{

			x=mpElement[i].dValueX[index];
            y=mpElement[i].dValueY[index];

			double a,b;

			a = (y0*x-y*x0)/(x-x0);
			b = (y-y0)/(x-x0);

			// Clip the ploting area if it exceed ranged .
			if(x > dRangeX[MAX] ) {x = dRangeX[MAX]; y=a+b*x;}
			if(x < dRangeX[MIN] ) {x = dRangeX[MIN]; y=a+b*x;}
			if(y > dRangeY[MAX] ) {y = dRangeY[MAX]; x=(y-a)/b;}
			if(y < dRangeY[MIN] ) {y = dRangeY[MIN]; x=(y-a)/b;}

			pt = Corrdinate(x,y);
			x0=x;
			y0=y;
			
            
			if (m_axisRect.PtInRect(pt)==FALSE)
            {
				if (m_axisRect.TopLeft().x > pt.x) pt.x = m_axisRect.TopLeft().x; 
				if (m_axisRect.TopLeft().y > pt.y) pt.y = m_axisRect.TopLeft().y;
				if (m_axisRect.BottomRight().x < pt.x) pt.x = m_axisRect.BottomRight().x;
				if (m_axisRect.BottomRight().y < pt.y) pt.y = m_axisRect.BottomRight().y;                
			}
            //else
			//{
		   		pDC->MoveTo(pt);
			
				if (mpElement[i].m_Type <=5)	// Draw lines.
					pDC->LineTo(pt);
				else
					pDC->MoveTo(pt) ;

				int symsz = mpElement[i].m_Width;
				if (symsz <= 0) symsz = 1;
				CRect rect(pt.x-symsz,pt.y-symsz,pt.x+symsz,pt.y+symsz);
				                
    			if (mpElement[i].m_Type == 6)	// Draw dots.
					pDC->Ellipse( rect );
				if (mpElement[i].m_Type >= 7)	// Draw rectangles.
				{
					CBrush aBrush(mpElement[i].m_Color);
	             	pDC->FillRect (rect,&aBrush);			
		            aBrush.DeleteObject();
				}
				
			//}
		    
		}

	    pDC->SelectObject(oldPen);
		delete pen ;
		pDC->SelectObject(oldBrush);
		delete brush;

	}


}