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Compare two lists having coordinates of shapes

cs03

I want to compare two lists having coordinates of shapes.

let-

listA=(  ((1 2) (3 4))   ((5 6) (7 8))  ((9 10) (11 12))  )             :- listA has coordinates of 3 shapes

listB=( (1 2) (3 4) )                                                            :-listB has coordinates of 1 shape

I want to compare coordinates of shape of listB with coordinates of every shape of listA,  such that if shape of listA is inside the shape of listB or overlapping it should be retained only and if not (outside the shape of listB or intersecting it) it should be discarded.

  • It's not clear what your lists are supposed to be representing - since they only seem to have two coordinates per shape. If that was just a simple example and they were supposed to be point lists of polygons, I'd say the simple solution would be to do:

    setof(shape listA dbPointArrayAnd(cvId shape listB))

    Otherwise if they were supposed to be bounding boxes (for rectangles, say), then you could compare the coordinates simply within the setof loop to see if the rectangles overlap (just a few simple comparisons, which I'll leave as an exercise for you because I'm too lazy to type them myself :) )

    Regards,

    Andrew.

  • Thanks for your suggestions Andrew....

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