C / C++ / MFC

// Verify the left button is down
	if ((nFlags & MK_LBUTTON) && (this == GetCapture()))
	{
		m_SecondPoint = point;				// Save the current cursor position

		if (m_pTempElement)
		{
			// 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
	}