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Group points using count rule

M
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Hello, probably this is something easy to achieve but I'm still new to FME. 

I'm reading a set of points from a DWG file. These are definition points from a dimension feature. Each dimension object has 3 definition points, but there is no dimension ID. All that I have is a set of points listed consecutively; the first 3 points belong to one feature, the next 3 points belong to another feature and so on. I want to group all points using a count or split rule but so far I can't find a way to implement it. 

Here is an example of what I want to accomplish. 

Count   fme_feature_type
1 	Dimension		|
2 	Dimension     		|--> Group 1 
3	Dimension		|

4	Dimension		| 
5	Dimension		|--> Group 2 
6	Dimension		|

Thanks 

Best answer by ebygomm

Use an attributecreator you can set the attribute value of a new attribute called group using ceil(@Value(count)/3)

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5 replies

gio
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  • gioContributor
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  • June 28, 2016

group = ceiling (count/3).

M
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  • masat
  • Author
  • June 28, 2016
gio wrote:

group = ceiling (count/3).

Thanks for the reply, but could you tell me what type of transformer should I use?

ebygomm
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  • ebygommInfluencer
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  • Best Answer
  • June 28, 2016

Use an attributecreator you can set the attribute value of a new attribute called group using ceil(@Value(count)/3)

M
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  • masat
  • Author
  • June 28, 2016
ebygomm wrote:

Use an attributecreator you can set the attribute value of a new attribute called group using ceil(@Value(count)/3)

Nice solution, thanks much!

M
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The other way would be to use a Counter and a ModuloCounter. Take the modulo count away from the full count (ExpressionEvaluator) and you get a unique ID for that group (the ID would be 3, 6, 9, 12, etc instead of 1, 2, 3, 4; but it will be unique for that group)

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