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How do I find the intersection of a list within a range

johntling
I want to find out whether my pin text coordinates is contained within a given rectangle pin coordinates (i.e. contained within the pin), how would I do this if I got the centerBox of the pin text coordinate, and then try to see whether that falls within the range of the pin coordinates.
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  • skillUser

     Hi John,

    I'm not sure if there is a generic point-based function for this, there are the various dbLayer* prefix functions, like dbLayerInside, and there is also a leIsPointInsideFig function, but these work on shapes.  However, having said this, I would have thought that the test is relatively simple, the point's X has to be >= the box lower left X, and <= the box upper right X AND the point's Y has to be >= the box lower left Yand <= the box upper right Y.  Something like the following I think:

    

procedure(CCSisPointInBox(pt box "ll")
  when(geCoordp(pt) && isBBox(box)
    when( xCoord(pt) >= xCoord(lowerLeft(box))  && 
          xCoord(pt) <= xCoord(upperRight(box)) &&
          yCoord(pt) >= yCoord(lowerLeft(box))  &&
          yCoord(pt) <= yCoord(upperRight(box))
        t
    ); when
  ); when
); procedure CCSisPointInBox

    I think that the above code does the trick?  It returns 't' if the conditions are all met, and nil otherwise, or if either the point is not a valid point, or the box is not a valid bounding box, as decided by the geCoordp and isBBox functions respectively.  The isLocation function could be used for the point, but I think that geCoordp is slightly more descriptive of what the function is used for.

    Best regards,

    Lawrence.

Reply
  • skillUser

     Hi John,

    I'm not sure if there is a generic point-based function for this, there are the various dbLayer* prefix functions, like dbLayerInside, and there is also a leIsPointInsideFig function, but these work on shapes.  However, having said this, I would have thought that the test is relatively simple, the point's X has to be >= the box lower left X, and <= the box upper right X AND the point's Y has to be >= the box lower left Yand <= the box upper right Y.  Something like the following I think:

    

procedure(CCSisPointInBox(pt box "ll")
  when(geCoordp(pt) && isBBox(box)
    when( xCoord(pt) >= xCoord(lowerLeft(box))  && 
          xCoord(pt) <= xCoord(upperRight(box)) &&
          yCoord(pt) >= yCoord(lowerLeft(box))  &&
          yCoord(pt) <= yCoord(upperRight(box))
        t
    ); when
  ); when
); procedure CCSisPointInBox

    I think that the above code does the trick?  It returns 't' if the conditions are all met, and nil otherwise, or if either the point is not a valid point, or the box is not a valid bounding box, as decided by the geCoordp and isBBox functions respectively.  The isLocation function could be used for the point, but I think that geCoordp is slightly more descriptive of what the function is used for.

    Best regards,

    Lawrence.

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