Smrf.NodeXL.Visualization.Wpf.NodeXLControl.LayOutOrDrawGraph C# (CSharp) Method

    LayOutOrDrawGraph()
    {
        AssertValid();

        #if TRACE_LAYOUT_AND_DRAW
        Debug.WriteLine("NodeXLControl: LayOutOrDrawGraph(), m_eLayoutState = "
            + m_eLayoutState);
        #endif

        Rect oGraphRectangle = this.GraphRectangle;

        #if TRACE_LAYOUT_AND_DRAW
        Debug.WriteLine("NodeXLControl: LayOutOrDrawGraph(), size = " +
            oGraphRectangle.Width + " , " + oGraphRectangle.Height);
        #endif

        System.Drawing.Rectangle oGraphRectangle2 =
            WpfGraphicsUtil.RectToRectangle(oGraphRectangle);

        switch (m_eLayoutState)
        {
            case LayoutState.Stable:

                break;

            case LayoutState.LayoutRequired:

                Debug.Assert(!m_oLayout.IsBusy);

                FireLayingOutGraph();

                m_oLastLayoutContext = new LayoutContext(oGraphRectangle2);

                m_eLayoutState = LayoutState.LayingOut;

                if (m_oLayout is SortableLayoutBase)
                {
                    // If the vertex layout order has been set, tell the layout
                    // object to sort the vertices before laying them out.

                    ( (SortableLayoutBase)m_oLayout ).
                        UseMetadataVertexSorter(m_oGraph);
                }

                // Start an asynchronous layout.  The m_oLayout object will
                // fire a LayOutGraphCompleted event when it is done.

                m_oLayout.LayOutGraphAsync(
                    m_oGraph, m_oLastLayoutContext);

                break;

            case LayoutState.LayingOut:

                break;

            case LayoutState.LayoutCompleted:

                // The asynchronous layout has completed and now the graph
                // needs to be drawn.

                m_eLayoutState = LayoutState.Stable;

                // Has the size of the control changed since the layout was
                // started?

                System.Drawing.Rectangle oLastGraphRectangle =
                    m_oLastLayoutContext.GraphRectangle;

                if (
                    oLastGraphRectangle.Width != oGraphRectangle2.Width
                    ||
                    oLastGraphRectangle.Height != oGraphRectangle2.Height
                    )
                {
                    // Yes.  Transform the layout to the new size.

                    #if TRACE_LAYOUT_AND_DRAW
                    Debug.WriteLine("NodeXLControl: Transforming layout.");
                    #endif

                    m_oLastLayoutContext = TransformLayout(oGraphRectangle);
                }

                DrawGraph(oGraphRectangle);

                break;

            case LayoutState.TransformRequired:

                // The control has been resized and now the graph's layout
                // needs to be transformed to the new size.

                m_oLastLayoutContext = TransformLayout(oGraphRectangle);

                m_eLayoutState = LayoutState.Stable;

                DrawGraph(oGraphRectangle);

                break;

            default:

                Debug.Assert(false);
                break;
        }
    }