Smrf.NodeXL.Visualization.Wpf.EdgeDrawingHistory.GetBounds C# (CSharp) Method

    GetBounds()
    {
        AssertValid();

        if (m_oEdge.IsSelfLoop)
        {
            Debug.Assert(false);
            throw new InvalidOperationException("Edge is self-loop.");
        }

        // Start with a rectangle that has the same dimensions as the edge, but
        // that starts at the origin and has an angle of zero.

        Point oVertex1Location = WpfGraphicsUtil.PointFToWpfPoint(
            m_oEdge.Vertex1.Location);

        Point oVertex2Location = WpfGraphicsUtil.PointFToWpfPoint(
            m_oEdge.Vertex2.Location);

        Double dLength = WpfGraphicsUtil.GetDistanceBetweenPoints(
            oVertex1Location, oVertex2Location);

        Double dAngleDegrees = MathUtil.RadiansToDegrees(
            WpfGraphicsUtil.GetAngleBetweenPointsRadians(
                oVertex1Location, oVertex2Location) );

        Double dHalfWidth = m_dWidth / 2.0;

        Point[] ao4BoundingPoints = new Point[4] {
            new Point(      0, -dHalfWidth),
            new Point(dLength, -dHalfWidth),
            new Point(dLength,  dHalfWidth),
            new Point(      0,  dHalfWidth),
            };

        // Rotate the rectangle so it is at the same angle as the edge.

        TransformPoints(new RotateTransform(dAngleDegrees), ao4BoundingPoints);

        // Translate the rotated rectangle to the location of the edge's first
        // endpoint.

        TransformPoints(
            new TranslateTransform(oVertex1Location.X, oVertex1Location.Y),
            ao4BoundingPoints);

        // Create a PathGeometry from the bounding points.

        return ( WpfPathGeometryUtil.GetPathGeometryFromPoints(
            ao4BoundingPoints[0],
            ao4BoundingPoints[1],
            ao4BoundingPoints[2],
            ao4BoundingPoints[3]
            ) );
    }