Polygon Vertex Order

I should add that I have trying using the Orientor and it doesn't help.

 

 

 

Hi,

 

 

If you added coordinate values of required first vertex to each feature as attributes (e.g. "x" and "y"), the PythonCaller may be a quick way.

 

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# Python Script Example

 

# Assume feature geometry is a single-part polygon having a Line boundary;

 

# every feature has attributes "x" and "y" for specifying the first vertex.

 

import fmeobjects

 

 

def rotatePolygonVertices(feature):

 

    # Get coordinate list of original polygon, except end node.

 

    coords = feature.getAllCoordinates()[:-1]

 

    

 

    # Get specified coordinate.

 

    x = float(feature.getAttribute('x'))

 

    y = float(feature.getAttribute('y'))

 

    

 

    # Find index of vertex that matches with the specified coordinate.

 

    # To avoid computational error, find closest vertex from the coordinate.

 

    index = 0

 

    min_d = (coords[0][0] - x)**2 + (coords[0][1] - y)**2

 

    for i, xy in enumerate(coords[1:]):

 

        d = (xy[0] - x)**2 + (xy[1] - y)**2

 

        if d < min_d:

 

            index , min_d = i +1, d

 

            

 

    # Reset polygon if the first vertex doesn't match with the specified coordinate.

 

    # Rotate and close the coordinate list, and then create new polygon.

 

    if 0 < index:

 

        coords = coords[index:] + coords[:index] # rotate

 

        coords.append(coords[0]) # close

 

        newBoundary = fmeobjects.FMELine(coords)

 

        feature.setGeometry(fmeobjects.FMEPolygon(newBoundary))

 

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Takashi

Yes, scripting is the second best of course. I too would like to know the reason for not using the Matcher.