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Delete objects within a ring

sagnea

Hi,

When creating a micro-SMD chip that uses circular pads (actually 16-sided polygons) over the active chip area, I would like to be able to delete all the vias within a predifined distance from the pad edge (both inside and outside).  In other words, I would like to define a ring within which I can select all objects on a given layer and delete them.  It would be advantageous if it were also possible to delete any object that touches the edge of the ring, however, this could be taken care of by increasing the size of the ring, so if that's not easily implemented, it doesn't matter.

Thanks,

Tony

 

 

  • Hi Tony,

    You could use layer operations to create a sized up and sized down shape from your original pad polygon, and then define a ring which is the sized up AND NOT the sized down shape.  The resulting shape is your "exclusion" ring. You can use this with the other shapes either by another layer boolean operation, or by something like the SKILL function dbGetTrueOverlaps() to find and delete the shapes overlapped by that ring. I think that you would want the latter function rather than dbGetOverlaps() given the complexity of the polygon shape (this latter function considers the bounding box overlap, rather than the true shape).  There are some dbLayer* prefix layer operation functions which you can use for the creation and selection steps mentioned.

    Hope this helps!

    Lawrence.

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