Smrf.NodeXL.Visualization.Wpf.DiamondVertexDrawingHistory.GetEdgeEndpoint C# (CSharp) Method

    GetEdgeEndpoint
    (
        Point otherEndpoint,
        out Point edgeEndpoint
    )
    {
        AssertValid();

        Point oVertexLocation = this.VertexLocation;

        // A diamond is just a rotated square, so the
        // VertexDrawingHistory.GetEdgePointOnRectangle() can be used if the
        // diamond and the other vertex location are first rotated 45 degrees
        // about the diamond's center.

        Double dHalfSquareWidth = m_dHalfWidth / Math.Sqrt(2.0);

        Rect oRotatedDiamond = new Rect(
            oVertexLocation.X - dHalfSquareWidth,
            oVertexLocation.Y - dHalfSquareWidth,
            2.0 * dHalfSquareWidth,
            2.0 * dHalfSquareWidth
            );

        Matrix oMatrix = WpfGraphicsUtil.GetRotatedMatrix(oVertexLocation, 45);
        Point oRotatedOtherVertexLocation = oMatrix.Transform(otherEndpoint);

        Point oRotatedEdgeEndpoint;
        
        GetEdgeEndpointOnRectangle(oVertexLocation, oRotatedDiamond,
            oRotatedOtherVertexLocation, out oRotatedEdgeEndpoint);

        // Now rotate the computed edge endpoint in the other direction.

        oMatrix = WpfGraphicsUtil.GetRotatedMatrix(oVertexLocation, -45);

        edgeEndpoint = oMatrix.Transform(oRotatedEdgeEndpoint);
    }