C++ CElement::GetBoundRect方法代码示例

void CSkViewView::OnDraw(CDC* pDC)
{
	CSkViewDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	if (!pDoc)
		return;

  POSITION aPos = pDoc->GetListHeadPosition();
  CElement* pElement = 0;
  while(aPos)
  {
    pElement = pDoc->GetNext(aPos);
    if(pDC->RectVisible(pElement->GetBoundRect()))
      pElement->Draw(pDC);
  }
}

void CSketcherView::OnDraw(CDC* pDC)
{
  CSketcherDoc* pDoc = GetDocument();
  ASSERT_VALID(pDoc);
  if(!pDoc)
    return;

  POSITION aPos = pDoc->GetListHeadPosition();
  CElement* pElement = 0;              // Store for an element pointer
  while(aPos)                          // Loop while aPos is not null
  {
    pElement = pDoc->GetNext(aPos);    // Get the current element pointer
    // If the element is visible...
    if(pDC->RectVisible(pElement->GetBoundRect()))
      pElement->Draw(pDC, m_pSelected);// ...draw it
  }
}

void CSketcherView::OnMouseMove(UINT nFlags, CPoint point)
{
  // Define a Device Context object for the view
  CClientDC aDC(this);                // DC is for this view
  OnPrepareDC(&aDC);                  // Get origin adjusted

    // If we are in move mode, move the selected element and return
  if(m_MoveMode)
  {
    aDC.DPtoLP(&point);                // Convert to logical coordinatess
    MoveElement(aDC, point);           // Move the element
    return;
  }

  aDC.SetROP2(R2_NOTXORPEN);          // Set the drawing mode
  if((nFlags&MK_LBUTTON)  && (this==GetCapture()))
  {
    aDC.DPtoLP(&point);              // convert point to Logical
    m_SecondPoint = point;           // Save the current cursor position

    if(m_pTempElement)
    {
      if(CURVE == GetDocument()->GetElementType())   // Is it a curve?
      {  // We are drawing a curve
         // so add a segment to the existing curve
         static_cast<CCurve*>(m_pTempElement)->AddSegment(m_SecondPoint);  
         m_pTempElement->Draw(&aDC);   // Now draw it
         return;                       // We are done
      }

      aDC.SetROP2(R2_NOTXORPEN);       // Set drawing mode
      // Redraw the old element so it disappears from the view
      m_pTempElement->Draw(&aDC);
      delete m_pTempElement;           // Delete the old element
      m_pTempElement = 0;              // Reset the pointer to 0
    }

    // Create a temporary element of the type and color that
    // is recorded in the document object, and draw it
    m_pTempElement = CreateElement();  // Create a new element
    m_pTempElement->Draw(&aDC);        // Draw the element
  }
  else
  { // We are not drawing an element so do highlighting...
    CSketcherDoc* pDoc=GetDocument();  // Get a pointer to the document
    CElement* pElement = 0;            // Store an element pointer
    CRect aRect(0,0,0,0);              // Store a rectangle
    POSITION aPos = pDoc->GetListHeadPosition();  // Get first element posn
    CElement* pOldSelection = m_pSelected;        // Save old selected element
    m_pSelected = 0;
    while(aPos)                        // Iterate through the list
    {
      pElement = pDoc->GetNext(aPos);
      aRect = pElement->GetBoundRect();
      aDC.LPtoDP(aRect);
      aRect.NormalizeRect();

      // Select the first element that appears under the cursor
      if(aRect.PtInRect(point))
      {
        m_pSelected = pElement;
        break;
      }
    }
    if(m_pSelected == pOldSelection)   // If new selection is same as old       
      return;                          // we are done

    // Unhighlight old selection if there is one
    if(pOldSelection != 0)             // Verify there is one
    {
      aRect = pOldSelection->GetBoundRect();
      aDC.LPtoDP(aRect);               // Convert to device coords
      aRect.NormalizeRect();           // Normalize
      InvalidateRect(aRect, FALSE);    // Invalidate area
    }

    // Highlight new selection if there is one
    if(m_pSelected != 0)               // Verify there is one
    {
      aRect = m_pSelected->GetBoundRect();
      aDC.LPtoDP(aRect);               // Convert to device coords
      aRect.NormalizeRect();           // Normalize
      InvalidateRect(aRect, FALSE);    // Invalidate area
    }
  }
}