Is there a way to get outer points of selected polygons?

 You can do a union of all the selected objects bboxes. trBBoxUnion( geGetSelSet()~>bBox )

 procedure( trBBoxUnion( bBoxList )
let( ( llxList llyList
urxList uryList
minllx minlly
maxurx maxury
)
llxList = foreach( mapcar bBox bBoxList
xCoord( lowerLeft( bBox )))
llyList = foreach( mapcar bBox bBoxList
yCoord( lowerLeft( bBox )))
urxList = foreach( mapcar bBox bBoxList
xCoord( upperRight( bBox )))
uryList = foreach( mapcar bBox bBoxList
yCoord( upperRight( bBox )))
minllx = apply( 'min llxList )
minlly = apply( 'min llyList )
maxurx = apply( 'max urxList )
maxury = apply( 'max uryList )
list( minllx:minlly maxurx:maxury )
) ; let
) ; procedure
trBBoxUnion( list( list(0:0 100:100) list(50:50 150:150)))

Hi How,

I presume that you are asking for the actual points of the resultant combined shape, rather than the overall bounding box?  I think that the easiest way to get this would be to use something like dbLayerAnd on the input shapes to create a temporary shape, get the points from this shape and then delete it when you're done with it. It may be a little clunky, but it would be simpler than other methods that I can think of. 

Hope this helps,

Lawrence.

Hi Pradesh,

Thanks for your propose solution but this function only able to get the bounding box( bBox) of the selected objects. Thanks a lot.

I was looking for a function which able to get the outer shape (polygon) for a selected object. It works similar like mark net, when you mark a net, it will highlight only the outer shape of the net, looks like big highlighted polygon. My intention to get the this big highlighted polygon's points and proceed for next step.

Thanks :)

Hi Lawrewnce,

Thanks for your propose solution. I did try several approach including dbLayerAnd but it doesn't work when selected shapes is not overlapping each other. As a result, this function only creates individual shapes.

Any idea? I can't figure out any way in getting this done. Hoping there are ideas from anyone in this forum. Thanks a bunch.

Hi Stefan,

Sorry that i can't really get what you means. Any where thanks.

I was trying to get outer shape of selected objects as below.

                    ___                                                             _ _ _

                   |_ _|                                                           |       |

         ____        ___                                                ___ |       |___

 ___|        |     |      |____                            _ __|                         |____

|__  ___  |      |_______|           =>           |______________________|

Hoping this help to make my question clear. Thanks

Hi kbhow,

the "convex hull" would look like this:

                    ___                                                        _ _ _
                   |_ _|                                                    /         \

         ____        ___                                               /             \

 ___|        |     |      |____                                  /                   \

|__  ___  |      |_______|           =>                 |_ ________  |

just the outer points are connected in a way that all points are inside the new
polygon; an interesting geometrical problem, there are some algorithms available.

Possibly you could achieve a result similar to your drawing by upsizing all shapes
to an intermediate layer by an amount that's sufficient to close all gaps, the shapes will merge,
then downsizing by the same amount, the outlines should look like your drawing but
the gaps will stay closed.

Size resp. leHiSize() will not merge the shapes,
dbLayerSize() or "Tools - Layer generation ... GROW" should do the job.

Stefan

How,

A good place to start would be with http://en.wikipedia.org/wiki/Convex_hull and  http://en.wikipedia.org/wiki/Convex_hull_algorithms

That said, I'm not sure it's quite a convex hull you want, because I suspect you want it to follow the outer edges rather than being like an elastic band around all the outermost points.

Regards,

Andrew.

 Hi Andrew,

Thanks for the sharing.

Ya, you're right.I actually want the outer edge rather than convex. Do you have any idea? At the same time, i'll go through the link the you share, hoping can get some hint or inspiration from that.

Regards,

How

Hello How,

besides of the convex hull approach, my second proposal was to apply a
upsizing-/downsizing-cycle to your shapes, did you already try if this fulfills your needs?

si=geGetSelectedSet()
cvid = geGetEditCellView()
stmp=dbLayerSize(cvid "TMPLAYER" si 3.5)
so=dbLayerSize(cvid "TGTLAYER" stmp -3.5)

applying a suitable sizing instead of 3.5um will merge your
shapes, even from more than one layer, into one shape;
downsizing this shape by the same amount will result in
a shape that should do what you want...

kind regards

Stefan