Smrf.NodeXL.Visualization.Wpf.GroupDrawer.DrawGroupLabel C# (CSharp) Method

    DrawGroupLabel
    (
        DrawingContext oDrawingContext,
        GraphDrawingContext oGraphDrawingContext,
        GroupInfo oGroupInfo
    )
    {
        Debug.Assert(oDrawingContext != null);
        Debug.Assert(oGraphDrawingContext != null);
        Debug.Assert(oGroupInfo != null);
        Debug.Assert(m_eLabelPosition != VertexLabelPosition.Nowhere);
        AssertValid();

        String sLabel = oGroupInfo.Label;
        Rect oGroupRectangle;

        if (
            String.IsNullOrEmpty(sLabel)
            ||
            !TryGetGroupRectangle(oGroupInfo, out oGroupRectangle)
            )
        {
            return;
        }

        FormattedText oFormattedText =
            m_oFormattedTextManager.CreateFormattedText(sLabel,
                m_oLabelTextColor, m_dLabelScale);

        oFormattedText.MaxTextWidth = oGroupRectangle.Width;
        oFormattedText.MaxTextHeight = oGroupRectangle.Height;

        // The alignment needs to be set before the width and height of the
        // FormattedText are obtained.

        SetTextAlignment(oFormattedText, m_eLabelPosition);

        // You can't use FormattedText.Width to get the width of the actual
        // text when text wrapping is enabled (FormattedText.MaxTextWidth > 0).
        // Instead, use a method that takes wrapping into account.

        Double dLabelWidth =
            WpfGraphicsUtil.GetFormattedTextSize(oFormattedText).Width;

        Double dLabelHeight = oFormattedText.Height;

        Double dGroupRectangleWidth = oGroupRectangle.Width;
        Double dGroupRectangleHeight = oGroupRectangle.Height;
        Double dMaxTextWidth = oFormattedText.MaxTextWidth;

        Double dTextOffsetXForCenter =
            (dGroupRectangleWidth - dMaxTextWidth) / 2.0;

        Double dTextOffsetYForMiddle =
            (dGroupRectangleHeight - dLabelHeight) / 2.0;

        Double dTextOffsetYForBottom =
            dGroupRectangleHeight - dLabelHeight - LabelVerticalMargin;

        Point oTextOrigin = oGroupRectangle.Location;
        Double dTextOffsetX = 0;
        Double dTextOffsetY = 0;

        switch (m_eLabelPosition)
        {
            case VertexLabelPosition.TopLeft:

                dTextOffsetX = LabelHorizontalMargin;
                dTextOffsetY = LabelVerticalMargin;
                break;

            case VertexLabelPosition.TopCenter:

                dTextOffsetX = dTextOffsetXForCenter;
                dTextOffsetY = LabelVerticalMargin;

                break;

            case VertexLabelPosition.TopRight:

                dTextOffsetX = -LabelHorizontalMargin;
                dTextOffsetY = LabelVerticalMargin;

                break;

            case VertexLabelPosition.MiddleLeft:

                dTextOffsetX = LabelHorizontalMargin;
                dTextOffsetY = dTextOffsetYForMiddle;

                break;

            case VertexLabelPosition.MiddleCenter:

                dTextOffsetX = dTextOffsetXForCenter;
                dTextOffsetY = dTextOffsetYForMiddle;

                break;

            case VertexLabelPosition.MiddleRight:

                dTextOffsetX = -LabelHorizontalMargin;
                dTextOffsetY = dTextOffsetYForMiddle;

                break;

            case VertexLabelPosition.BottomLeft:

                dTextOffsetX = LabelHorizontalMargin;
                dTextOffsetY = dTextOffsetYForBottom;

                break;

            case VertexLabelPosition.BottomCenter:


                dTextOffsetX = dTextOffsetXForCenter;
                dTextOffsetY = dTextOffsetYForBottom;

                break;

            case VertexLabelPosition.BottomRight:

                dTextOffsetX = -LabelHorizontalMargin;
                dTextOffsetY = dTextOffsetYForBottom;

                break;

            default:

                Debug.Assert(false);
                break;
        }

        oTextOrigin.Offset(dTextOffsetX, dTextOffsetY);

        DrawLabelBackground(oDrawingContext, oGraphDrawingContext,
            oFormattedText, m_oLabelTextColor, LabelBackgroundAlpha,
            oTextOrigin);

        oDrawingContext.DrawText(oFormattedText, oTextOrigin);
    }