[Insight-users] xxxxxSPAMxxxxx itkPolylineMask2DImageFilter

[Isaac Abbott]

I've added code to a project to allow a user to define the polyline to be
used in the itkPolylineMask2DImageFilter.

It works when I draw the polyline by clicking vertex points in the
counter-clockwise direction only.
It does not work when the polyline is defined by points in the clockwise
orientation (it sets the whole image to 0).

What is the deal with this?  Is there a reason for it or is it a bug?  It is
certainly not convenient.

These results can be replicated by changing two lines in the test file:
itkPolylineMask2DImageFilterTest
See commented lines below.

    VertexType v;
    v[0] = 12.8;
    v[1] = 25.6;
    inputPolyline->AddVertex(v);

    v[0] = 25.6;
    v[1] = 12.8;//39.4;                //Swapped to break filter;
    inputPolyline->AddVertex(v);

    v[0] = 39.4;
    v[1] = 25.6;
    inputPolyline->AddVertex(v);

    v[0] = 25.6;
    v[1] = 39.4;//12.8;                //Swapped to break filter;
    inputPolyline->AddVertex(v);
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