// Elements.cpp : implementation file
  //
  
  include <stdafx.h>
  include <Sketcher.h>
  include <Elements.h>
  include <math.h>
  
  // CElement
  
  CElement::CElement()
  {
  }
  
  CElement::~CElement()
  {
  }
  
  // Get the bounding rectangle for an element
  CRect CElement::GetBoundRect()
  {
     CRect BoundingRect;                 // Object to store bounding rectangle
     BoundingRect = m_EnclosingRect;     // Store the enclosing rectangle
  
     // Increase the rectangle by the pen width
     BoundingRect.InflateRect(m_Pen, m_Pen);
     return BoundingRect;                // Return the bounding rectangle
  }
  
  // CElement member functions
  
  CLine::CLine(void)
  {
  }
  
  CLine::~CLine(void)
  {
  }
  
  // CLine class constructor
  CLine::CLine(CPoint Start, CPoint End, COLORREF aColor)
  {
     m_StartPoint = Start;               // Set line start point
     m_EndPoint = End;                   // Set line end point
     m_Color = aColor;                   // Set line color
     m_Pen = 1;                          // Set pen width
  
     // Define the enclosing rectangle
     m_EnclosingRect = CRect(Start, End);
     m_EnclosingRect.NormalizeRect();
  }
  
  // Draw a CLine object
  void CLine::Draw(CDC* pDC)
  {
     // Create a pen for this object and
     // initialize it to the object color and line width of 1 pixel
     CPen aPen;
     if(!aPen.CreatePen(PS_SOLID, m_Pen, m_Color))
     {
        // Pen creation failed. Abort the program
        AfxMessageBox(_T("Pen creation failed drawing a line"), MB_OK);
        AfxAbort();
     }
  
     CPen* pOldPen = pDC->SelectObject(&aPen);  // Select the pen
  
     // Now draw the line
     pDC->MoveTo(m_StartPoint);
     pDC->LineTo(m_EndPoint);
  
     pDC->SelectObject(pOldPen);                // Restore the old pen
  }
  
  CRectangle::CRectangle(void)
  {
  }
  
  CRectangle::~CRectangle(void)
  {
  }
  
  // CRectangle class constructor
  CRectangle:: CRectangle(CPoint Start, CPoint End, COLORREF aColor)
  {
     m_Color = aColor;          // Set rectangle color
     m_Pen = 1;                 // Set pen width
  
     // Define the enclosing rectangle 
     m_EnclosingRect = CRect(Start, End);
     m_EnclosingRect.NormalizeRect();
  }
  
  // Draw a CRectangle object
  void CRectangle::Draw(CDC* pDC)
  {
     // Create a pen for this object and
     // initialize it to the object color and line width of 1 pixel
     CPen aPen;
     if(!aPen.CreatePen(PS_SOLID, m_Pen, m_Color))
     {
        // Pen creation failed
        AfxMessageBox(_T("Pen creation failed drawing a rectangle"), MB_OK);
        AfxAbort();
     }
  
     // Select the pen
     CPen* pOldPen = pDC->SelectObject(&aPen);
     // Select the brush
     CBrush* pOldBrush = (CBrush*)pDC->SelectStockObject(NULL_BRUSH);
  
     // Now draw the rectangle
     pDC->Rectangle(m_EnclosingRect);
  
     pDC->SelectObject(pOldBrush);       // Restore the old brush
     pDC->SelectObject(pOldPen);         // Restore the old pen
  }
  
  CCircle::CCircle(void)
  {
  }
  
  CCircle::~CCircle(void)
  {
  }
  
  // Constructor for a circle object
  CCircle::CCircle(CPoint Start, CPoint End, COLORREF aColor)
  {
     // First calculate the radius
     // We use floating point because that is required by 
     // the library function (in math.h) for calculating a square root.
     long Radius = static_cast<long> (sqrt(
                    static_cast<double>((End.x-Start.x)*(End.x-Start.x)+
                                        (End.y-Start.y)*(End.y-Start.y))));
  
     // Now calculate the rectangle enclosing
     // the circle assuming the MM_TEXT mapping mode
     m_EnclosingRect = CRect(Start.x-Radius, Start.y-Radius,
                             Start.x+Radius, Start.y+Radius);
  
     m_Color = aColor;                   // Set the color for the circle
     m_Pen = 1;                          // Set pen width to 1
  }
  
  // Draw a circle
  void CCircle::Draw(CDC* pDC)
  {
     // Create a pen for this object and
     // initialize it to the object color and line width of 1 pixel
     CPen aPen;
     if(!aPen.CreatePen(PS_SOLID, m_Pen, m_Color))
     {
        // Pen creation failed
        AfxMessageBox(_T("Pen creation failed drawing a circle"), MB_OK);
        AfxAbort();
     }
  
     CPen* pOldPen = pDC->SelectObject(&aPen);  // Select the pen
  
     // Select a null brush
     CBrush* pOldBrush = (CBrush*)pDC->SelectStockObject(NULL_BRUSH);
  
     // Now draw the circle
     pDC->Ellipse(m_EnclosingRect);
  
     pDC->SelectObject(pOldPen);                // Restore the old pen
     pDC->SelectObject(pOldBrush);              // Restore the old brush
  }
  
  CCurve::CCurve(void)
  {
  }
  
  CCurve::~CCurve(void)
  {
  }
  
  // Constructor for a curve object
  CCurve::CCurve(COLORREF aColor)
  {
     m_Color = aColor;
     m_EnclosingRect = CRect(0,0,0,0);
     m_Pen = 1;
  }
  
  // Draw a curve
  void CCurve::Draw(CDC* pDC)
  {
  }