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function to stretch a polygon region

SS007

Hi,

I need to read the co-ordinates of a polygon and stretch it in both x direction.

The polygon may be of T U or L shape. Please help me

Thanks in advance

SS

 

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  • Nisanth,

    The problem is that the list of t's and nil's is dependent upon where the list of points starts. So your example for a U shape only works because of where the first point happens to be in your example. In other cases it probably wouldn't work. The same is true for your L shape - it's probably not working because of where the first point happens to be.

    It would be relatively easy to loop through the ~>points attribute for a polygon and identify which are vertical edges and hence identify which vertices are part of an X edge. You'd also want to figure out which are on a specific side - that also is just a matter of coding whatever requirements you have (you'll need to think about this, because this is rather dependent on what you are trying to achieve, and I can't really do your work for you) - but it shouldn't be difficult.

    Regards,

    Andrew.

Reply

  • Nisanth,

    The problem is that the list of t's and nil's is dependent upon where the list of points starts. So your example for a U shape only works because of where the first point happens to be in your example. In other cases it probably wouldn't work. The same is true for your L shape - it's probably not working because of where the first point happens to be.

    It would be relatively easy to loop through the ~>points attribute for a polygon and identify which are vertical edges and hence identify which vertices are part of an X edge. You'd also want to figure out which are on a specific side - that also is just a matter of coding whatever requirements you have (you'll need to think about this, because this is rather dependent on what you are trying to achieve, and I can't really do your work for you) - but it shouldn't be difficult.

    Regards,

    Andrew.

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