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Script for finding same Metal type Shape Overlapping a Trace

RFStuff

Dear All,

I want to find whether same metal type shape  is overlapping another shape of the same metal.

If it is overlapping, then the overlap area should blink.

Basically this I need for finding SHORT with undesired trace.

For example: I have a trace ( may be a Rectangle/Path). I select this. Then an enabled SKILL script should find a same metal type shape overlapping with the trace and highligting the overlapped area with the trace.

Can anybody show me some light  for this.

Kind Regards,

  • I'd probably use dbGetOverlaps to find the shapes (on the layer of interest) within the bBox of the selected trace, and then use dbLayerAnd to produce the shapes on a dummy layer to find the precise interactions. Then create markers with the same coordinates as the polygons coming from dbLayerAnd, and delete the dbLayerAnd result shapes.

    There's also a set of functions (dbPointAnd or something like that - I'm in an airport and can't check) which don't need to actually create any shapes in the database, but those could be harder to use if you've got a variety of different source shape types.

    Regards,
    Andrew

  •  Andrew is correct, dbLayerAnd is the easiest to use to create the overlapping areas but the dbPointArrayAnd (I'm away from Virtuoso so check the name) may be easier to use if you find shapes in the hierarchy. Transform the points to the current cellView, perform the AND and create a marker. If using dbLayerAnd, output the shapes to a layer like "y0" and then turn them into markers. Be sure to delete the new shapes.

    Ted

  •  dear andrew & ted,

     thanks alot for your replies.

    could you please tell th function for creating a marker around the polygon.

    is odcRegMarker() the right one ?

    kind regards,

  •  For that purpose I would try "geCreateMarkerByBBox".

  • Bernd's right - that's what I was going to suggest (or any of the geCreateMarker family). Note that when you move to IC61, these functions are obsolete - they create markers using the "old" way of a shape on the marker layer, compared with the new OpenAccess marker objects. So in IC61 you should use dbCreateMarker (this didn't exist in IC5141).

    Andrew.

  • Dear Andrew,

    I tried with dbGetOverlaps(). But it did NOT work

    The test scenario is as follows:-

    I am in the toplevel and I have the hierarchy level of 5.In level 4 only 3 shapes (paths) are overlapping with the trace.

    But if you see it is actually showing me 6 shapes. Which is NOT correct.

     shapeList = dbGetOverlaps(cv obj1~>bBox obj1~>layer 0:5)
    \t (db:217705012
    \t     (db:217517248 db:262161624)
    \t     (db:217517248 db:262161472)
    \t     (db:217517248 db:262161312)
    \t     (db:217517248 db:261977724)
    \t     (db:217517248 db:261977644)
    \t     (db:217517248 db:261977564)
    \t )

    Then for dbLayerAnd() the following returned nil

    dbLayerAnd(cv "ME7" list(car(cdr(shapeList))) list(obj1))

     Kind Regards,

  • 1. Before IC6, dbGetOverlaps returned the value of any shape whose Bounding Box intersected with the search bounding box. dbGetTrueOverlaps found shapes that only physically overlapped the search box.

    2. The shapes in the hierarchy have to be transformed to the current coordinate space before passing into dbLayerAnd. The shapes that are returned as a list are hierarchical shapes, you have to transform their points into the current coordinate space and then either create new shapes (usually on a layer like y0) or use the point list in the dbPointArray functions. If doing the former, be sure to delete the new shapes after you are done with them. If the latter, you have to transform rectangles into 4 points and paths have to be transformed into their outlines.

    Commands to look up: dbConcatTransform,  dbTransformPoint.

    Ted

    RFStuff said:

    DI tried with dbGetOverlaps(). But it did NOT work

    The test scenario is as follows:-

    I am in the toplevel and I have the hierarchy level of 5.In level 4 only 3 shapes (paths) are overlapping with the trace.

    But if you see it is actually showing me 6 shapes. Which is NOT correct.

     shapeList = dbGetOverlaps(cv obj1~>bBox obj1~>layer 0:5)
    \t (db:217705012
    \t     (db:217517248 db:262161624)
    \t     (db:217517248 db:262161472)
    \t     (db:217517248 db:262161312)
    \t     (db:217517248 db:261977724)
    \t     (db:217517248 db:261977644)
    \t     (db:217517248 db:261977564)
    \t )

    Then for dbLayerAnd() the following returned nil

    dbLayerAnd(cv "ME7" list(car(cdr(shapeList))) list(obj1))

     Kind Regards,

     

     

  • 1) The guide says that usage of dbGetTrueOverlaps() should be avoided

     

    2) I couldn't get about your point transformation idea.

    1st of all dbLayerAnd() needs the list of shape IDs not the list of POINTS.

    2nd if you know the exact points of overlap ( which you think can be transformed), then why one needs the ANDing operation.

    It is a chicken egg dilema.

    Kind Regards,

     

     

  • Disregard the warning. It may have performance problems in IC5141 but it is the only way you will get the answer you want.

    The shape ID's that are being returned are hierarchical. The dbLayer functions only take shapes defined in the local coordinate space. If you just get the shape from the hierarchical list, you are getting the shape in the local coordinate space for the shape's master cellView. You have to get the points of that shape and then transform them to the current coordinate space (in you open cellView) and then create a new shape with those transformed points. Pass that new shape into  the dbLayer functions. You are not transforming the overlap, you are transforming the original points to the current coordinate space, creating a new shape and using that shape to determine the overlap points.

     Which came first? The rooster.

  • I've posted an example in the last few days called something like abGetOverlapTransform which will take one of the results from dbGetOverlaps and give you the overall transform. Then you could use dbCopyFig to copy the original shape using abGetOverlapShape - I may have posted that too, I can't remember - I'll check, using the combined transform into the current cellview. Do the dbLayetAnd on this new shape and then delete it when you're done.

    Slight performance penalty when using dbGetTrueOverlaps but you don't really need to worry about using that because any false hits will return nil from the layer and.

    Andrew

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