How to get the union box of the selected objects ?

Hi Charley,

This is because the command you are referring to is a C API in the ITK manual, not a SKILL API.   It should not be too hard to write, however the documentation has a general example:

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

I would recommend that a different name is used for the procedure, say CCFbBoxUnion() (Cadence CIC Forum...). This should answer your question I think.

Best regards,

Lawrence.

 Dear Lawrence ,

 Thank you for help .

Charley

 Dear Lawrence

It can get the union bbox.

But if I want to get the surrounded edge of all select objects? (e.g. polygon points)

How can I do it ?

Thank you.

Charley

Charley,

It sounds as if you're after something like the convex hull - this was discussed in another thread.

Regards,

Andrew.