+5Hello,
Is there a possibility to change the start/end point of closed curve?
I created closed curves using the LineCombiner (for merging line segments to 1 closed track with the same start and end point).
Now I have a shapefile with starting points of tracks, and I want the closed curves to start/end in their starting point instead of the random start/end that is created whith the LineCombiner.
Anyone an idea how to do this?
Best answer by takashi
Hi @ireen, this workflow might help you.
Step 1: Remove the last vertex from the closed line, get the number of vertices, decompose the line into individual vertices, and add 0-based vertex index to them.
Step 2: Find the index of the vertex that spatially matches the given starting point, and then update every vertex index in the correct order that starts from the given point.
ExpressionEvaluator Parameters
@CurrentAttribute()<@Value(_start_index) ? @Value(_coordcount)+(@CurrentAttribute()-@Value(_start_index)) : @CurrentAttribute()-@Value(_start_index)Step 3: Re-construct closed line whose vertices have the correct order.
Hi @ireen, this workflow might help you.
Step 1: Remove the last vertex from the closed line, get the number of vertices, decompose the line into individual vertices, and add 0-based vertex index to them.
Step 2: Find the index of the vertex that spatially matches the given starting point, and then update every vertex index in the correct order that starts from the given point.
ExpressionEvaluator Parameters
@CurrentAttribute()<@Value(_start_index) ? @Value(_coordcount)+(@CurrentAttribute()-@Value(_start_index)) : @CurrentAttribute()-@Value(_start_index)Step 3: Re-construct closed line whose vertices have the correct order.
If you would use a PythonCaller to modify the order of line vertices, the workflow could be more concise.
# PythonCaller Script Example
import fmeobjects
def changeStartVertexOfClosedLine(feature):
v = feature.getAllCoordinates()[:-1]
i = int(feature.getAttribute('_index'))
feature.setGeometry(fmeobjects.FMELine(v[i:] + v[:i+1]))
+6Hello
i have a problem with the LineCombiner too.
I have lines and arcs and they are sorted in the sequence like i need it.(Sorted with Attributes for line id and element number starting with 0), but the LineCombiner does not start with the first incoming element.
How can i force the LineCombiner to start with my first element?
Thanks