On Sep 28, 2011, at 3:11 AM, Havard Tveite wrote: > GEOMTRANSFORM end only works for the lines of a line layer. > Is your layer a line layer?
Sigh. No, my layer is a POINT layer. Where on this page [http://mapserver.org/mapfile/style.html] is it documented that GEOMTRANSFORM is only for LINE layers? I could be wrong, but nowhere do I see that mentioned. In other words, is GEOMTRANSFORM simply not working at all because my layer is a POINT layer? That would explain why the symbol is not being produced at the "end" point of the symbol, even though I have specified GEOMTRANSFORM "end" Thanks Håvard. I will lose GEOMTRANSFORM from that STYLE definition. > > Håvard > > On 9/27/2011 4:48 PM, Puneet Kishor wrote: >> >> On Sep 27, 2011, at 2:18 AM, Havard Tveite wrote: >> >>> Have you seen: >>> >>> http://mapserver.org/mapfile/symbology/construction.html#changing-the-center-of-a-point-symbol >> >> >> Yup, seen and read it from end to end until my eyes glazed. Perhaps it is >> clear as crystal to the rest of the world, but I can't fathom anything there >> applicable to me. I am facing four problems -- >> >> 1. As I mentioned below, per the docs, I am supposed to be able to declare >> "ANGLE AUTO" in my STYLE definition. That simply does not work for me. I >> *have* to declare the angle the same as the angle of the stem of the arrow >> "ANGLE [az]" in order to get arrow heads headed in the same direction as the >> arrow stems. >> >> 2. From the docs on GEOMTRANSFORM, "end: produces the last point of the >> geometry. When used with ANGLE AUTO, it can for instance be used to render >> an arrowhead." Well, no... it is *not* producing the *last point of the >> geometry* as I understand it. Instead, it is producing the middle point of >> the geometry. And it sure as as I can see is not working with ANGLE AUTO >> (see #1 above). >> >> 3. I have tried several variations on my arrow head to try shift its center, >> but I am failing to translate the information in the above document to be >> able to do it correctly. >> >> 4. Perhaps most important: the length of the arrow is varying based on >> [rate]. In other words, I want only the stem to be shorter or longer, but >> the arrow head to be the same size, and to be at the "end" of the stem >> always. In fact, there are instances in which [rate] could be equal to zero. >> In those instances I don't want any arrow to be drawn at all. >> >> *** In other words, I want an arrow stem to be as long as the varying >> [rate], and if the stem has a length greater than zero then and only then do >> I want an arrow head at the end of the stem pointing in the same direction >> as the stem. *** >> >> I even tried using a truetype font symbol, but I get no image at all but no >> error as well. >> >> I even tried using a SYMBOL of TYPE pixmap pointing to an image of an arrow. >> I realize that if I could make that work, it would still be unsatisfactory >> because as MapServer would scale my arrow image, it would make the attached >> arrow head also larger, and that would look ugly. In any case, I couldn't >> get that to work as well... no image at all, but no error as well. >> >> Could be my compilation of MapServer was buggy, but I didn't see any >> compilation time errors, and other than the above oddities, it works quite >> well. >> >> $./mapserv -v >> MapServer version 6.0.1 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG SUPPORTS=PROJ >> SUPPORTS=AGG SUPPORTS=FREETYPE SUPPORTS=ICONV SUPPORTS=WMS_SERVER >> SUPPORTS=WMS_CLIENT SUPPORTS=GEOS INPUT=POSTGIS INPUT=GDAL INPUT=SHAPEFILE >> >> I would love to know if my *** objective *** above can be accomplished with >> MapServer. If not, I would look at other workaround. I am currently >> rendering arrows using OpenLayers vector layer... it works quite well, but >> is slow... MapServer is much faster, and could be cached, hence my desire to >> use MapServer. >> >> Thanks. >> >> >>> >>> Håvard Tveite >>> >>> On 9/27/2011 4:12 AM, Puneet Kishor wrote: >>>> My arrows look like so -->-- instead of ----> with declarations like so >>>> >>>> SYMBOL >>>> NAME "vert-line" >>>> TYPE vector >>>> POINTS >>>> 0 1 >>>> 0 0 >>>> END >>>> END >>>> >>>> SYMBOL >>>> NAME "up" >>>> TYPE vector >>>> POINTS >>>> 0 1 >>>> 0.5 0 >>>> 1 1 >>>> END >>>> END >>>> >>>> CLASS >>>> STYLE >>>> SYMBOL 'vert-line' >>>> ANGLE [az] >>>> SIZE [rate] >>>> COLOR 0 0 0 >>>> WIDTH 1 >>>> END >>>> STYLE >>>> SYMBOL "up" >>>> ANGLE [az] >>>> SIZE 5 >>>> GEOMTRANSFORM "end" >>>> COLOR 0 0 0 >>>> END >>>> END >>>> >>>> But, at least the arrow heads are aligned correctly. Because, if I use >>>> "ANGLE auto" as prescribed in the docs instead of "ANGLE [az]" as shown >>>> above, my arrows draw like so --^--. The heads are always pointed up, and >>>> are in the middle. >>>> >>>> Suggestions? >> >> > > -- > Håvard Tveite > Department of Mathematical Sciences and Technology, UMB > Drøbakveien 31, POBox 5003, N-1432 Ås, NORWAY > Phone: +47 64965483 Fax: +47 64965401 http://www.umb.no/imt/ _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
