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Need a Skill code to get a list of elements under a plygonal shape.

AmitBiswas

I am looking for a comand in skill to get the list of elements under a polygonal shape.

There is a command

 

dbgetTrueOverlaps(
d_cellView
l_bBox
)

 here the output of this command is a list of elements. But this command only takes the input as a list of two points.

 I want to give a list of more number of points as input to the code and the output it will return a list of elements under the polygon formed by the list of input points.

If anybody knows how to get it done please repply.

Regards,

Amit 

 


Parents

  • The only way to do this is to decompose the polygon into rectangles and run dbGetTrueOverlaps on each rectangle. If your polygons are not orthogonal, then you'll have to do some approximating. Cadence has a routine called dbLayerTile that will take an input shape and decompose it into trapezoids. If the original shape is orthogonal, then the results will be rectangles. The drawback to this routine is that it will actually create the trapezoids (or rectangles) in your layout where the source shapes are located. If you need to be able to work in a read-only mode, then you would have to mess around with a scratch cell to do your layer tiling. You alternative is to write your own polygon to trapezoid routine or find one out on the web.

     -Derek

Reply

  • The only way to do this is to decompose the polygon into rectangles and run dbGetTrueOverlaps on each rectangle. If your polygons are not orthogonal, then you'll have to do some approximating. Cadence has a routine called dbLayerTile that will take an input shape and decompose it into trapezoids. If the original shape is orthogonal, then the results will be rectangles. The drawback to this routine is that it will actually create the trapezoids (or rectangles) in your layout where the source shapes are located. If you need to be able to work in a read-only mode, then you would have to mess around with a scratch cell to do your layer tiling. You alternative is to write your own polygon to trapezoid routine or find one out on the web.

     -Derek

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