Would it not be possible to draw the polygon as 2 different polygons (the inner polygon & the outer using the postgis functions)? You could specify a fixed offset for one or the other.
On the other hand, if you just have 1 polygon (with a single line, so no inner polygons) and you're trying to accomplish a visual effect that the inside of the polygon lies further away, i would accomplish this by drawing a thicker border. Or you could possibly use the asymmetric line drawing functions that are available. Maybe give a more concrete example of what exactly you are trying to do. On 12 August 2010 22:46, Bob Basques <bob.basq...@ci.stpaul.mn.us> wrote: > All, > > Wondering, would this work for INSIDE/OUTSIDE situations with regard to > polygon drawing? Or is the left/right sides of the line strictly relying on > the from/to aspects of how the polygon was drawn > (clockwise/counterclockwise) This would be handy for off-setting to (ONLY) > the inside of a polygon for example. > > Thanks > > bobb > > > > > >>> Wim Vanbelle <wimvanbe...@gmail.com> wrote: > > Thank you very much everyone. And especially Thomas. That was indeed what I > was looking for. You saved me a lot of work! > > Much appreciated. > > On 12 August 2010 17:50, Fawcett, David (MPCA) > > <david.fawc...@state.mn.us> > > wrote: > >> Thanks Thomas >> >> That looks nice in my test example. >> >> David. >> >> >> -----Original Message----- >> From: thomas bonfort [mailto:thomas.bonf...@gmail.com] >> Sent: Thursday, August 12, 2010 10:45 AM >> To: Fawcett, David (MPCA) >> Cc: Wim Vanbelle; mapserver-users@lists.osgeo.org >> Subject: Re: [mapserver-users] Offset values from database >> >> the -99 is a special offset value that shifts the line as you are looking >> for. >> >> style >> color 255 0 0 >> offset -2 -99 >> width 2 >> end >> style >> color 0 255 0 >> offset 2 -99 >> width 2 >> end >> >> >> not perfect as there are artifacts on sharp angles, but worth a try. >> >> regards, >> thomas >> >> On Thu, Aug 12, 2010 at 16:56, Fawcett, David (MPCA) >> <david.fawc...@state.mn.us> wrote: >> > Wim, >> > >> > >> > >> > You can do these offsets in pixel values at a class level, just not a >> > feature level. This pretty much does what you are describing, although >> it >> > gets a little funky when the lines are diagonal and not straight. >> > >> > >> > >> > CLASS >> > >> > STYLE >> > >> > COLOR 0 0 0 >> > >> > WIDTH 2 >> > >> > END >> > >> > STYLE >> > >> > COLOR 255 0 0 >> > >> > WIDTH 2 >> > >> > OFFSET 10 10 >> > >> > END >> > >> > STYLE >> > >> > COLOR 0 255 0 >> > >> > WIDTH 2 >> > >> > OFFSET -10 -10 >> > >> > END >> > >> > >> > >> > END >> > >> > >> > >> > David. >> > >> > >> > >> > From: mapserver-users-boun...@lists.osgeo.org >> > [mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Wim >> Vanbelle >> > Sent: Thursday, August 12, 2010 9:32 AM >> > To: mapserver-users@lists.osgeo.org >> > Subject: Re: [mapserver-users] Offset values from database >> > >> > >> > >> > Maybe this pic helps elaborate on what i'm trying to accomplish: >> > http://fileshare.myroute.be/exchange/asymmetriclinedrawing.png >> > It should be noted that the distance between the 2 (new) lines, should >> be a >> > fixed value over the zoomlevels. It must not be the case that at the >> > furthest zoomlevel the lines are further apart. >> > >> > I've looked all over for this, but never really found a proper solution. >> I >> > tried cartographic symbol drawing, but it only draws on the same side >> every >> > time. Maybe I'm just doing it wrong :). >> > >> > On 12 August 2010 16:28, Wim Vanbelle <wimvanbe...@gmail.com> wrote: >> > >> > Hello, >> > >> > thanks for your feedback. >> > >> > The issue with this, is that the underlying linestrings (the 2 that >> would >> > lie on top of eachother), have different colors :(. >> > >> > So they have to be moved apart from one another. I have not found a way >> to >> > do this with asymmetric line drawing either, as it will always offset to >> the >> > same side. >> > >> > This is why i would need the offset value to be configurable in the >> > database. I could select a different pixel offset for each line and they >> > would always appear next to eachtoher (no matter what zoomlevel). >> > >> > I can elaborate on the problem more if I am a little too confusing ! >> > >> > On 12 August 2010 16:20, Cristiano Sumariva <sumar...@gmail.com> wrote: >> > >> > If it is a display problem why not try create some special symbology to >> > overlap one line with another using different symbol strokes. So the >> user >> > will se that are 2 lines overlayed. >> > >> > 2010/8/12 Wim Vanbelle <wimvanbe...@gmail.com> >> > >> > Hi David, >> > >> > I read that documentation before though. I was hoping it just hadn't >> been >> > updated... Is this possibly a feature for 6.0 ? >> > >> > Are there any other ways how one could offset a feature in pixels, >> rather >> > than in lat/long coords? >> > >> > Maybe I should elaborate on the original problem a little. Consider 2 >> line >> > segments that lie above one another. The general idea is to 'offset' >> them a >> > given x , y value, so they will both display next to one another, rather >> > than on top of eachother. >> > >> > If you would however perform this code simply on lat/long values, it >> would >> > imply, that when scaling your map at the most detailed zoom level, the >> lines >> > would lie very far apart, and when zoomed out, they would appear to lie >> on >> > top of eachother. >> > >> > I find it hard to believe that I would need to pre calculate all the >> data in >> > order to obtain geometry objects for each zoom level. >> > >> > Maybe some veterans have some good insight in this :). >> > >> > >> > >> > On 12 August 2010 15:26, Fawcett, David (MPCA) < >> david.fawc...@state.mn.us> >> > wrote: >> > >> > Wim, >> > >> > >> > >> > If you don’t want me to tell you, you will likely want to look at the >> > mapfile documentation at: http://mapserver.org/mapfile/style.html >> > >> > >> > >> > [Spoiler Alert] >> > >> > You can’t use values from an attribute table to set the value of this >> > property >> > >> > [/Spoiler Alert] >> > >> > >> > >> > David. >> > >> > From: mapserver-users-boun...@lists.osgeo.org >> > [mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Wim >> Vanbelle >> > Sent: Thursday, August 12, 2010 5:48 AM >> > >> > To: mapserver-users@lists.osgeo.org >> > >> > Subject: [mapserver-users] Offset values from database >> > >> > >> > >> > Hi, >> > >> > I'm trying to load offset X, Y data from the postgis database. >> > >> > Each feature has an offset value defined there. >> > >> > My mapfile (relevant part) looks like this: >> > >> > In the layer: >> > DATA "geom_mercator from map_links using >> > unique Id using SRID=900913" >> > >> > STYLE >> > WIDTH 6 >> > COLOR 0 255 0 >> > ANTIALIAS TRUE >> > ANGLE AUTO >> > OFFSET [offsetX] [offsetY] >> > END >> > >> > Please don't tell me the offsetX, Y values cannot be read from the >> database. >> > That would be a huge issue for me. >> > >> > Thank you for your time. >> > >> > Best regards >> > >> > >> > >> > >> > >> > _______________________________________________ >> > mapserver-users mailing list >> > >> > mapserver-users@lists.osgeo.org >> > >> > http://lists.osgeo.org/mailman/listinfo/mapserver-users >> > >> > >> > >> > >> > >> > >> > >> > _______________________________________________ >> > mapserver-users mailing list >> > mapserver-users@lists.osgeo.org >> > http://lists.osgeo.org/mailman/listinfo/mapserver-users >> > >> > >> >> >
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