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Bounding box of a layer in an instance in layout

lahsivece

Hi ,

I want to get bounding box of a drawing layer inside an instance (could be a pcell or a userdefined cell). (Ex: Bounding box of Poly 1 layer inside a transistor pcell ). dbComuteBBoxNoNLP gives me the bounding box of the instance.

Is there a function that can do this? 

Thanks

Vishal

Parents
  • Andrew Beckett

    Hi Vishal,

    There's no built-in function to do this, but it's easy to write one. I just threw this together (this uses destructuringBind, which is available from IC615 onwards, but you could just pull apart each bBox yourself instead if using an earlier version:

    procedure(CCFinstLayerBBox(inst layerName @optional (purpose "drawing"))
        let((shapes)
            shapes=car(exists(LP inst~>master~>lpps
                LP~>layerName==layerName && LP~>purpose==purpose))~>shapes
            when(shapes
                destructuringBind(((mllx mlly) (murx mury)) car(shapes)~>bBox
                    foreach(shape cdr(shapes)
                        destructuringBind(((llx lly) (urx ury)) shape~>bBox
                            mllx=min(mllx llx)
                            mlly=min(mlly lly)
                            murx=max(murx urx)
                            mury=max(mury ury)
                        )
                    )
                    dbTransformBBox(list(mllx:mlly murx:mury) inst~>transform)
                )
            )
        )
    )

    Regards,

    Andrew.

     

Reply
  • Andrew Beckett

    Hi Vishal,

    There's no built-in function to do this, but it's easy to write one. I just threw this together (this uses destructuringBind, which is available from IC615 onwards, but you could just pull apart each bBox yourself instead if using an earlier version:

    procedure(CCFinstLayerBBox(inst layerName @optional (purpose "drawing"))
        let((shapes)
            shapes=car(exists(LP inst~>master~>lpps
                LP~>layerName==layerName && LP~>purpose==purpose))~>shapes
            when(shapes
                destructuringBind(((mllx mlly) (murx mury)) car(shapes)~>bBox
                    foreach(shape cdr(shapes)
                        destructuringBind(((llx lly) (urx ury)) shape~>bBox
                            mllx=min(mllx llx)
                            mlly=min(mlly lly)
                            murx=max(murx urx)
                            mury=max(mury ury)
                        )
                    )
                    dbTransformBBox(list(mllx:mlly murx:mury) inst~>transform)
                )
            )
        )
    )

    Regards,

    Andrew.

     

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