Smrf.NodeXL.Visualization.Wpf.EdgeDrawer.FilterIntermediatePoints C# (CSharp) Method

    FilterIntermediatePoints
    (
        IEdge oEdge,
        VertexDrawingHistory oVertex1DrawingHistory,
        VertexDrawingHistory oVertex2DrawingHistory
    )
    {
        Debug.Assert(oEdge != null);
        Debug.Assert(oVertex1DrawingHistory != null);
        Debug.Assert(oVertex2DrawingHistory != null);
        AssertValid();

        List<Point> oFilteredIntermediatePoints = new List<Point>();
        System.Drawing.PointF [] aoIntermediateCurvePoints;

        DrawingVisual oVertex1DrawingVisual =
            oVertex1DrawingHistory.DrawingVisual;

        DrawingVisual oVertex2DrawingVisual =
            oVertex2DrawingHistory.DrawingVisual;

        if ( EdgeUtil.TryGetIntermediateCurvePoints(oEdge,
            out aoIntermediateCurvePoints) )
        {
            foreach (System.Drawing.PointF oIntermediateCurvePoint in 
                aoIntermediateCurvePoints)
            {
                Point oIntermediateCurveWpfPoint =
                    WpfGraphicsUtil.PointFToWpfPoint(oIntermediateCurvePoint);

                // Check whether the point falls within the bounds of either
                // vertex.
                //
                // This could be done more quickly but with more code by
                // selectively hit-testing only vertex 1 or vertex 2 as we move
                // along the curve.  However, the hit-testing is so fast that
                // it's probably not worth the extra complexity.  On one test
                // machine, for example, 200,000 hit tests took about 24 ms,
                // and that didn't vary much with vertex shape or size.

                if (
                    oVertex1DrawingVisual.HitTest(
                        oIntermediateCurveWpfPoint) == null
                    &&
                    oVertex2DrawingVisual.HitTest(
                        oIntermediateCurveWpfPoint) == null
                    )
                {
                    oFilteredIntermediatePoints.Add(
                        oIntermediateCurveWpfPoint);
                }
            }
        }

        return (oFilteredIntermediatePoints);
    }