There seems to be a notable hole in the geometry handling of FME.
There's no easy way to split a polygon by a line. This is something even kindergarten kids can do ("if you cut the pie here, how many pieces do you have?"), but FME can't.
So can we please have a transformer that splits a polygon by a line. If you search these boards you'll see it's a commonly requested question (how to).
+10@Jonathan I just created a custom transformer with the name PolygonCutter. You can find on the FME HUB. Just click here
+9Also, FME doesn't draw all over the walls with crayons - this functionality must be added immediately.
Anyway, I'm not clear from your description why you can't use a LineOnAreaOverlayer?
+9
My point about crayons stands...
+18It would make sense that LineOnAreaOverlayer would do this, and that is where we'd put this functionality. It is true that we are a bit lacking in this area. I'm impressed with the # of votes this already achieved in such a short time. Vote early and vote often! :-)
I put all the line and polygon features into a TopologyBuilder, then used the AreaBuilder to build the 'cut' polygons. I had to use a Snapper on the lines prior to the TopologyBuilder. I only had one polygon to cut, so perhaps this doesn't work in more complex cases.
+5Hi Lars,
Thanks for helping with that. But there's a few flaws in your transformer still. First one I spotted is that you're losing your _temp_id attribute along the way (check Intersector and AreaBuilder) and even if you retain it there, you'll have to assign it to all the new parts...
+1Hi All, any news on this basic but new to be made functionality within FME, from the Safe side?
Cheers,
Hans
+8I just tested the transformer. Works great for the geometry, but it does something strange with the merged attributes. It seems to merge values from random other objects.
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