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Selecting shapes contained in/inside shape

ajk68

Hi,

I am looking for a way to select all shapes contained within another shape.

I have a list of candidate shapes and I want to test to see which ones are inside a polygon shape (in this case an annular gate polygon).

So far I have:

geSelectArea(window_id gate_shape~>points gate_shape~>objType)
gatecont_shapes=geGetSelectedSet(working_cellview)
geDeselectAll(window_id)

I don't really want to select and deselect as this might clear selections that have already been made. Is there a way to do this outside of the graphic editor suite of commands?

Another issue with this is that it selects everything within the polygon (not just a candidate shape). I could filter the list, but given the above issue (selection in GE), it's somewhat a secondary problem.

Thanks.

Art


  • There are several possibilities, e.g. the Layer Boolean Functions, specifically 'dbLayerInside', should do what you are asking. There is also the 'Advanced Boolean Engine' with 'abeLayerInside' as equivalent, which might be more efficient. The manual way reduces to the point-inside-polygon problem known from computational geometry.

    If that selecting/deselecting troubles you, you could also:
    set = geGetSelectedSet(); store current selection
    ;; do whatever you want with the selection
    geSelectFigs(set); restore selection

    Regards,

  • in reply to henker

    Another possibility would be to check whether all the points on the candidate polygons are inside the target polygon's points - this function can check a single point. However, I've just realised that if you have a polygon representing a ring (i.e. it's got a hole in the middle) then you could have a rectangle which has all four points within the ring, but it covers the hole in the middle. You could check for that remaining case by using dbPointArrayAndNot to determine whether there are any residual parts not within the ring. In fact that might be a simpler way of checking in the first place (if you don't want to create temporary shapes). The abe functions that suggested would be another good alternative that works through the hierarchy (if that matters) and they also don't create temporary shapes.

    Regards,

    Andrew

  • in reply to henker

    I think I'll use your geSelectFigs(set) idea. 

    Using boolean type functions, I'm not sure how I get the overlap of a shape with a layer...

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