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Finding the lowerleft(x1,y1) and upperright(x2,y2) of a bounding box

JMCaJHU

 Hi,

I'm new to Cadence and skill.  I've been studying sample code and ultimately need to make procedures that will create instances of different inv, different or gates and other logic gates in a row.  To do this, I plan to find the width of the gate, and stack them side by side.  Is there any code that will let me find a bounding box's x1 and x2?  I can then subtract to find its width and run a for loop that places an instance every n(x2-x1). 

 

I realize there is already a similar question.  I tried that code but it didnt seem to work.

JC 

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  • skillUser

     Hi JC,

    Oops - the dbComputeBBox() forces the bounding box to be recalculated but it does not return the bounding box of the cellview.  The bounding box of a database object can be found easily by querying the bBox attribute of it. Using your example:

    bBox = db_inv_master~>bBox

    Then the code should work. As a suggestion I would recommend "defensive" programming, i.e. check what you are expecting and only continue if it is correct. Example of this:

    when( bBox = db_inv_master~>bBox ;; when this attribute is non-nil
     ll = lowerLeft(bBox)
     ...
    ); when

    Or you could issue a warning, depending on what you want to do:

    bBox = db_inv_master~>bBox
    if(isBBox(bBox) then
     ;; do the code
    else
     warn("Did not obtain a valid bBox - %L" bBox)
    ); if

    Notice the use of the isBBox() function to validate the bounding box in the second example.

    Hopefully the examples above help you to get past this problem.

    Regards,

    Lawrence.

Reply
  • skillUser

     Hi JC,

    Oops - the dbComputeBBox() forces the bounding box to be recalculated but it does not return the bounding box of the cellview.  The bounding box of a database object can be found easily by querying the bBox attribute of it. Using your example:

    bBox = db_inv_master~>bBox

    Then the code should work. As a suggestion I would recommend "defensive" programming, i.e. check what you are expecting and only continue if it is correct. Example of this:

    when( bBox = db_inv_master~>bBox ;; when this attribute is non-nil
     ll = lowerLeft(bBox)
     ...
    ); when

    Or you could issue a warning, depending on what you want to do:

    bBox = db_inv_master~>bBox
    if(isBBox(bBox) then
     ;; do the code
    else
     warn("Did not obtain a valid bBox - %L" bBox)
    ); if

    Notice the use of the isBBox() function to validate the bounding box in the second example.

    Hopefully the examples above help you to get past this problem.

    Regards,

    Lawrence.

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