Smrf.NodeXL.Visualization.Wpf.VertexDrawer.DrawLabelShape C# (CSharp) Method

    DrawLabelShape
    (
        IVertex oVertex,
        GraphDrawingContext oGraphDrawingContext,
        DrawingContext oDrawingContext,
        DrawingVisualPlus oDrawingVisual,
        VisibilityKeyValue eVisibility,
        Boolean bDrawAsSelected,
        String sLabel,
        CollapsedGroupDrawingManager oCollapsedGroupDrawingManager
    )
    {
        Debug.Assert(oVertex != null);
        Debug.Assert(oGraphDrawingContext != null);
        Debug.Assert(oDrawingContext != null);
        Debug.Assert(oDrawingVisual != null);
        Debug.Assert( !String.IsNullOrEmpty(sLabel) );
        Debug.Assert(oCollapsedGroupDrawingManager != null);
        AssertValid();

        // Figure out what colors to use.

        Color oOutlineColor;

        Color oTextColor = GetColor(oVertex, eVisibility, false);

        Color oFillColor = GetColor(oVertex, eVisibility,
            ReservedMetadataKeys.PerVertexLabelFillColor, m_oLabelFillColor,
            true);

        if (bDrawAsSelected)
        {
            // The outline color is always the selected color.

            oOutlineColor = m_oSelectedColor;

            // The text color is the default or per-vertex color with no alpha.

            oTextColor.A = 255;

            // The fill color is the default or per-vertex fill color with no
            // alpha.

            oFillColor.A = 255;
        }
        else
        {
            // The outline color is the default or per-vertex color with alpha.

            oOutlineColor = oTextColor;

            // The text color is the default or per-vertex color with alpha.

            // The fill color is the default or per-vertex fill color with
            // alpha.
        }

        Double dLabelFontSize = GetLabelFontSize(oVertex);

        FormattedText oFormattedText = CreateFormattedTextWithWrap(
            sLabel, oTextColor, dLabelFontSize);

        Rect oVertexRectangle = GetVertexRectangle(
            GetVertexLocation(oVertex), oFormattedText.Width,
            oFormattedText.Height);

        // Pad the text.

        Rect oVertexRectangleWithPadding = oVertexRectangle;
        Double dLabelPadding = GetLabelPadding(dLabelFontSize);

        oVertexRectangleWithPadding.Inflate(dLabelPadding,
            dLabelPadding * 0.7);

        if (m_oFormattedTextManager.Typeface.Style != FontStyles.Normal)
        {
            // This is a hack to move the right edge of the padded rectangle
            // to the right to adjust for wider italic text, which
            // FormattedText.Width does not account for.  What is the correct
            // way to do this?  It might involve the FormattedText.Overhang*
            // properties, but I'll be darned if I can understand how those
            // properties work.

            Double dItalicCompensation = dLabelFontSize / 7.0;
            oVertexRectangleWithPadding.Inflate(dItalicCompensation, 0);
            oVertexRectangleWithPadding.Offset(dItalicCompensation, 0);
        }

        // Move the vertex if it falls outside the graph rectangle.

        Double dOriginalVertexRectangleWithPaddingX =
            oVertexRectangleWithPadding.X;

        Double dOriginalVertexRectangleWithPaddingY =
            oVertexRectangleWithPadding.Y;

        MoveVertexIfNecessary(oVertex, oGraphDrawingContext,
            oCollapsedGroupDrawingManager, ref oVertexRectangleWithPadding);

        oVertexRectangle.Offset(

            oVertexRectangleWithPadding.X -
                dOriginalVertexRectangleWithPaddingX,

            oVertexRectangleWithPadding.Y -
                dOriginalVertexRectangleWithPaddingY
            );

        oDrawingVisual.SetEffect( GetRectangleEffect(
            oGraphDrawingContext, oOutlineColor) );

        // Draw the padded rectangle, then the text.

        WpfGraphicsUtil.DrawPixelAlignedRectangle(oDrawingContext,
            GetBrush(oFillColor), GetPen(oOutlineColor, DefaultPenThickness),
            oVertexRectangleWithPadding);

        oDrawingContext.DrawText(oFormattedText, oVertexRectangle.Location);

        // Return information about how the vertex was drawn.

        return ( new LabelVertexDrawingHistory(oVertex, oDrawingVisual,
            bDrawAsSelected, oVertexRectangleWithPadding) );
    }