Thank you very much everyone. And especially Thomas. That was indeed what I was looking for. You saved me a lot of work! <br><br>Much appreciated.<br><br><div class="gmail_quote">On 12 August 2010 17:50, Fawcett, David (MPCA) <span dir="ltr"><<a href="mailto:David.Fawcett@state.mn.us">David.Fawcett@state.mn.us</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Thanks Thomas<br>
<br>
That looks nice in my test example.<br>
<font color="#888888"><br>
David.<br>
</font><div><div></div><div class="h5"><br>
-----Original Message-----<br>
From: thomas bonfort [mailto:<a href="mailto:thomas.bonfort@gmail.com">thomas.bonfort@gmail.com</a>]<br>
Sent: Thursday, August 12, 2010 10:45 AM<br>
To: Fawcett, David (MPCA)<br>
Cc: Wim Vanbelle; <a href="mailto:mapserver-users@lists.osgeo.org">mapserver-users@lists.osgeo.org</a><br>
Subject: Re: [mapserver-users] Offset values from database<br>
<br>
the -99 is a special offset value that shifts the line as you are looking for.<br>
<br>
style<br>
color 255 0 0<br>
offset -2 -99<br>
width 2<br>
end<br>
style<br>
color 0 255 0<br>
offset 2 -99<br>
width 2<br>
end<br>
<br>
<br>
not perfect as there are artifacts on sharp angles, but worth a try.<br>
<br>
regards,<br>
thomas<br>
<br>
On Thu, Aug 12, 2010 at 16:56, Fawcett, David (MPCA)<br>
<<a href="mailto:David.Fawcett@state.mn.us">David.Fawcett@state.mn.us</a>> wrote:<br>
> Wim,<br>
><br>
><br>
><br>
> You can do these offsets in pixel values at a class level, just not a<br>
> feature level. This pretty much does what you are describing, although it<br>
> gets a little funky when the lines are diagonal and not straight.<br>
><br>
><br>
><br>
> CLASS<br>
><br>
> STYLE<br>
><br>
> COLOR 0 0 0<br>
><br>
> WIDTH 2<br>
><br>
> END<br>
><br>
> STYLE<br>
><br>
> COLOR 255 0 0<br>
><br>
> WIDTH 2<br>
><br>
> OFFSET 10 10<br>
><br>
> END<br>
><br>
> STYLE<br>
><br>
> COLOR 0 255 0<br>
><br>
> WIDTH 2<br>
><br>
> OFFSET -10 -10<br>
><br>
> END<br>
><br>
><br>
><br>
> END<br>
><br>
><br>
><br>
> David.<br>
><br>
><br>
><br>
> From: <a href="mailto:mapserver-users-bounces@lists.osgeo.org">mapserver-users-bounces@lists.osgeo.org</a><br>
> [mailto:<a href="mailto:mapserver-users-bounces@lists.osgeo.org">mapserver-users-bounces@lists.osgeo.org</a>] On Behalf Of Wim Vanbelle<br>
> Sent: Thursday, August 12, 2010 9:32 AM<br>
> To: <a href="mailto:mapserver-users@lists.osgeo.org">mapserver-users@lists.osgeo.org</a><br>
> Subject: Re: [mapserver-users] Offset values from database<br>
><br>
><br>
><br>
> Maybe this pic helps elaborate on what i'm trying to accomplish:<br>
> <a href="http://fileshare.myroute.be/exchange/asymmetriclinedrawing.png" target="_blank">http://fileshare.myroute.be/exchange/asymmetriclinedrawing.png</a><br>
> It should be noted that the distance between the 2 (new) lines, should be a<br>
> fixed value over the zoomlevels. It must not be the case that at the<br>
> furthest zoomlevel the lines are further apart.<br>
><br>
> I've looked all over for this, but never really found a proper solution. I<br>
> tried cartographic symbol drawing, but it only draws on the same side every<br>
> time. Maybe I'm just doing it wrong :).<br>
><br>
> On 12 August 2010 16:28, Wim Vanbelle <<a href="mailto:wimvanbelle@gmail.com">wimvanbelle@gmail.com</a>> wrote:<br>
><br>
> Hello,<br>
><br>
> thanks for your feedback.<br>
><br>
> The issue with this, is that the underlying linestrings (the 2 that would<br>
> lie on top of eachother), have different colors :(.<br>
><br>
> So they have to be moved apart from one another. I have not found a way to<br>
> do this with asymmetric line drawing either, as it will always offset to the<br>
> same side.<br>
><br>
> This is why i would need the offset value to be configurable in the<br>
> database. I could select a different pixel offset for each line and they<br>
> would always appear next to eachtoher (no matter what zoomlevel).<br>
><br>
> I can elaborate on the problem more if I am a little too confusing !<br>
><br>
> On 12 August 2010 16:20, Cristiano Sumariva <<a href="mailto:sumariva@gmail.com">sumariva@gmail.com</a>> wrote:<br>
><br>
> If it is a display problem why not try create some special symbology to<br>
> overlap one line with another using different symbol strokes. So the user<br>
> will se that are 2 lines overlayed.<br>
><br>
> 2010/8/12 Wim Vanbelle <<a href="mailto:wimvanbelle@gmail.com">wimvanbelle@gmail.com</a>><br>
><br>
> Hi David,<br>
><br>
> I read that documentation before though. I was hoping it just hadn't been<br>
> updated... Is this possibly a feature for 6.0 ?<br>
><br>
> Are there any other ways how one could offset a feature in pixels, rather<br>
> than in lat/long coords?<br>
><br>
> Maybe I should elaborate on the original problem a little. Consider 2 line<br>
> segments that lie above one another. The general idea is to 'offset' them a<br>
> given x , y value, so they will both display next to one another, rather<br>
> than on top of eachother.<br>
><br>
> If you would however perform this code simply on lat/long values, it would<br>
> imply, that when scaling your map at the most detailed zoom level, the lines<br>
> would lie very far apart, and when zoomed out, they would appear to lie on<br>
> top of eachother.<br>
><br>
> I find it hard to believe that I would need to pre calculate all the data in<br>
> order to obtain geometry objects for each zoom level.<br>
><br>
> Maybe some veterans have some good insight in this :).<br>
><br>
><br>
><br>
> On 12 August 2010 15:26, Fawcett, David (MPCA) <<a href="mailto:David.Fawcett@state.mn.us">David.Fawcett@state.mn.us</a>><br>
> wrote:<br>
><br>
> Wim,<br>
><br>
><br>
><br>
> If you don’t want me to tell you, you will likely want to look at the<br>
> mapfile documentation at: <a href="http://mapserver.org/mapfile/style.html" target="_blank">http://mapserver.org/mapfile/style.html</a><br>
><br>
><br>
><br>
> [Spoiler Alert]<br>
><br>
> You can’t use values from an attribute table to set the value of this<br>
> property<br>
><br>
> [/Spoiler Alert]<br>
><br>
><br>
><br>
> David.<br>
><br>
> From: <a href="mailto:mapserver-users-bounces@lists.osgeo.org">mapserver-users-bounces@lists.osgeo.org</a><br>
> [mailto:<a href="mailto:mapserver-users-bounces@lists.osgeo.org">mapserver-users-bounces@lists.osgeo.org</a>] On Behalf Of Wim Vanbelle<br>
> Sent: Thursday, August 12, 2010 5:48 AM<br>
><br>
> To: <a href="mailto:mapserver-users@lists.osgeo.org">mapserver-users@lists.osgeo.org</a><br>
><br>
> Subject: [mapserver-users] Offset values from database<br>
><br>
><br>
><br>
> Hi,<br>
><br>
> I'm trying to load offset X, Y data from the postgis database.<br>
><br>
> Each feature has an offset value defined there.<br>
><br>
> My mapfile (relevant part) looks like this:<br>
><br>
> In the layer:<br>
> DATA "geom_mercator from map_links using<br>
> unique Id using SRID=900913"<br>
><br>
> STYLE<br>
> WIDTH 6<br>
> COLOR 0 255 0<br>
> ANTIALIAS TRUE<br>
> ANGLE AUTO<br>
> OFFSET [offsetX] [offsetY]<br>
> END<br>
><br>
> Please don't tell me the offsetX, Y values cannot be read from the database.<br>
> That would be a huge issue for me.<br>
><br>
> Thank you for your time.<br>
><br>
> Best regards<br>
><br>
><br>
><br>
><br>
><br>
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><br>
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><br>
><br>
><br>
><br>
><br>
><br>
><br>
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><br>
><br>
<br>
</div></div></blockquote></div><br>