Hi, > I known this sound like a strange question, but is it > possible to create a buffer around 1/2 of geomtry objectt. > > If I choose to buffer round a stright line, I get a geomtry > that looks like a sausage, if I buffer round a point, I > get a geomtry that looks like a circle. > > What I would like to do is buffer round only half an object, > in the case of a point I would like to get a semi circle, > buffer round a line, 1/2 a sausage! > > Is this possible, any suggestions ?
Buffer the whole object, Take the bounding box of the generated buffer Cut the latest in half Your <1/2 buffer> is the geometric intersection beetween the generated buffer and its 1/2 bounding box. As for the way of cutting the bbox, it's up to you to define a way since you did not detail which half you wanted. There may be other better ways of doing it, but this one will do the job. As a first optimization, you could first buffer half the object instead of the whole one (and stay consistent with your definition of half). Good luck, Vincent > > In the simultation that I am modeling, the data point/line > describe a starting point and I need to ensure that its > possible for traffic to leave the starting point on one side. > > Dave. > -- > Any views expressed in this message are those of the > individual sender, except where the sender specifically > states them to be the views of the Pinan Software > > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
