Hello George, I'll be using Google maps on an Android phone to display the polygon with the cross hatching.
Mike On Jun 3, 2011, at 2:21 PM, George Silva wrote: > Hello Mike, > > What kinda of software will be used to do this? > > Most GIS softwares can depict line hatchings without needing it physically > exists on the database. Each line of the hatch has a special meaning for you > or no? > > If so, you should consider using a proper style, that will do that without > giving you headaches to create the hatches. > > George > > On Fri, Jun 3, 2011 at 3:17 PM, Michael Welter <m...@introspect.com> wrote: > Hello, > > I have a polygon (with interior holes) that I would like to depict on a map > using diagonal lines. I don't suppose there's a ST_ function for this :-) > > Thinking out loud, I should derive the bounding box of the polygon, divide > the top and right edges into equidistant points. From the top points draw > 135° vectors, and from the right points draw 225° vectors to the other side > of the box. > > Now the hard part: for each line, determine the point where it enters the > polygon and the point where it exits. Also, where it enters an interior hole > and where it exits. > > The actual drawing on the map happens on a client computer (without postGIS), > so the desired result from postGIS would be a list of line segments. > > Does anyone have any ideas on this? > > Thanks, > Mike > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > > > > -- > George R. C. Silva > > Desenvolvimento em GIS > http://geoprocessamento.net > http://blog.geoprocessamento.net > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users
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