Brent,
Ok, we had been using an earlier version of the mapserver documentation we had downloaded which had the text below. The latest version now describes the discussed functionally more closely. We had been looking at using the previous functionally to draw and rotate a symbol around the label text. Not what we are thinking but this could be used for something like displaying the wind speed and symbol rotated for the wind direction using a symbol around the outside. To do this it sounds like a new GEOMTRANSFORM type. Thanks Ian STYLE The start of a STYLE object. Label specific mechanisms of the STYLE object are the GEOMTRANSFORM options: GEOMTRANSFORM [labelpnt|labelpoly] Creates geometries that can be used for styling the label. * labelpnt generates a point with its center at the middle of the bounding rectangle of the text. * labelpoly generates the bounding rectangle for the text, with 1 pixel of padding added in all directions. The resulting geometries can be styled using the mechanisms available in the STYLE object. New in version 6.0. From: Brent Fraser [mailto:[email protected]] Sent: Sunday, December 11, 2011 1:52 PM To: Ian Walberg Cc: [email protected] Subject: Re: [mapserver-users] GEOMTRANSFORM LABELPNT example Ian, No, there is no ability to do that, unless you use POSITION CC. There had been some discussion several months ago to add functions to the GEOMTRANSFORM resulting in RFC 72 (http://www.mapserver.org/development/rfc/ms-rfc-72.html) I think something like GEOMTRANSFORM (getCentroid(labelpoly)) would be a good addition, but I don't have a specific use-case. What were you planning to do the center of the label polygon? Best Regards, Brent Fraser On 12/11/2011 2:18 PM, Ian Walberg wrote: So is it expected that labelpnt generates a point with its center at the middle of the bounding rectangle of the text? Thanks Ian -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brent Fraser Sent: Sunday, December 11, 2011 1:02 PM To: thomas bonfort Cc: [email protected] Subject: Re: [mapserver-users] GEOMTRANSFORM LABELPNT example Thomas, I tracked it down to the LABELCACHE setting. LABELCACHE ON gives the expected results LABELCACHE OFF gives my old blue-dot-on-the-left results. See attached PDFs. Best Regards, Brent Fraser On 12/11/2011 1:05 PM, thomas bonfort wrote: There might have been a bug in the initial implementation. trying it out with current trunk gives me the expected result, unless I'm missing something. On Sun, Dec 11, 2011 at 20:44, Brent Fraser<[email protected]> <mailto:[email protected]> wrote: Thomas, See comments below. Best Regards, Brent Fraser On 12/11/2011 12:26 PM, thomas bonfort wrote: I think this is all expected behavior, although the documentation may be incorrect. LABELPNT draws a marker on the geographic position the label is attached to. This corresponds to the center of the label text only if the label is in position CC. I think that is what is intended but my original test case (using CC ) resulted in the LABELPNT rendered on the left side of the labelpoly, see http://lists.osgeo.org/pipermail/mapserver-dev/attachments/20110526/47c9 bc8c/labelpnt-0001.png. I had expected it to be coincident with the yellow circle and green cross. To draw a label at the center of the label text, another geomtransform would have to be implemented, named e.g. LABELBBOXCENTROID. or maybe GEOMTRANSFORM (centroid([LABELPOLY])) regards, thomas On Sun, Dec 11, 2011 at 19:34, Brent Fraser<[email protected]> <mailto:[email protected]> wrote: Hey Jeff, I've been looking into this too (not finished yet). I'm using v6.0.1 and can reproduce my original results (blue dot to the left) AND Ian's (grey dot coincident with white dot). Very strange. My shapefile dataset gets reprojected from geographic to UTM, so that may be causing the difference. I need to look into that... Best Regards, Brent Fraser On 12/11/2011 10:57 AM, Jeff McKenna wrote: On 11-12-11 11:20 AM, Ian Walberg wrote: Here is the map file we are using ms4w 3.0.3. We thought the larger grey circle should be drawn in the center of the label text. What have we done wrong? I have done some testing on this on Windows, with MapServer trunk (6.1-dev), here are my findings: - I used Brent's original example styles (from http://osgeo-org.1803224.n2.nabble.com/GEOMTRANSFORM-labelpnt-location-t d6408065.html) with Ian's FEATURE layer --> Brent's "Blue Dot" LABELPNT with POSITION CC is now correctly placed in the center of the label text (so it seems this has been fixed in the code, but I can't find the ticket that says that) - If I change to POSITION LR (as in Ian's example layer) then I get Ian's issue (LABELPNT is placed at the geometry location, not in the center of the label text - but this is now an issue of understanding the developer's logic (from that thread SteveL says "Let me ponder this and get back to you. I think it makes sense to use the label point geotransform only with position CC so that it matches actual shape location.") That's all I know at this point (ha pun). -jeff _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
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