I would recommend the UTF Grid approach. http://mapserver.org/development/rfc/ms-rfc-93.html or
On 9/9/14, 6:35 AM, "Basques, Bob (CI-StPaul)" <bob.basq...@ci.stpaul.mn.us> wrote: >All, > >It's probably not the cleanest way to approach it, but maybe a straight >imagemap type approach. You use the four corners of the label bounding >poly and send as an imagemap or json set or id query. > >I think the bounding polys need to somehow be thought of as a ad-hoc data >layer themselves. Is there a way of sub-selecting feature constructs >(that were originated by mapserver, like centroids are, into a reusable >(on the fly) dataset? > >My immediate thoughts were to use a clientside imagemage (which is passe >these days) and that is where the translation occurs for the bounding >boxes, via the imagemap generation. > >bobb >________________________________________ >From: Lime, Steve D (MNIT) >Sent: Monday, January 20, 2014 9:43 AM >To: Basques, Bob (CI-StPaul); wiltomap; mapserver-users@lists.osgeo.org >Subject: RE: [mapserver-users] Clickable label > >That or a UTFGrid. I don't believe that support (in master) handles >labels but maybe it could. In UTFGrid context you wouldn't want to render >characters anyway, only the bounding polygons. However, because the grid >is rendered at a lower resolution than the related map label placement >consistency might be the issue. --Steve >________________________________________ >From: Basques, Bob (CI-StPaul) >Sent: Friday, January 10, 2014 6:15 PM >To: Lime, Steve D (MNIT); wiltomap; mapserver-users@lists.osgeo.org >Subject: RE: [mapserver-users] Clickable label > >Steve, > >I've been thinking on this thread since it started, I wonder, could you >use a imagemap template from Mapserver, but populate it with the Label >bounding polygons? > >bobb > > >________________________________________ >From: mapserver-users-boun...@lists.osgeo.org >[mapserver-users-boun...@lists.osgeo.org] on behalf of Lime, Steve D >(MNIT) [steve.l...@state.mn.us] >Sent: Friday, January 10, 2014 4:14 PM >To: wiltomap; mapserver-users@lists.osgeo.org >Subject: Re: [mapserver-users] Clickable label > > This can't be done with stock MapServer. Labels are dynamic by nature >and are the product of a map raw while queries work off the base data. >The bridge between the map and a query is a conversion from pixels to map >coordinates based on map size and extent. > >You might be able to pull this off using MapScript. For a query you'd >have to do things in two stages: > > 1) Draw the map (in memory) based on the map the user interacted with >(same extent, size and set of layers) so that a label cache is created. > 2) Search the label cache based on the query point and based on that >pull the appropriate feature. > >I don't know if step 2 is feasible or not. You used to be able to loop >through it, not sure about now. > >There might be other ways using an image where you render text and label >backgrounds using the same color, a color that you could map back to a >feature id. The map would basically contain label polygons in a raster >you could, in turn, query that raster using point and retrieve a feature >id. I have doubts that you could match the first image to the second so >this would be a huge long shot. > >Steve > >-----Original Message----- >From: mapserver-users-boun...@lists.osgeo.org >[mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of wiltomap >Sent: Friday, January 10, 2014 2:17 AM >To: mapserver-users@lists.osgeo.org >Subject: [mapserver-users] Clickable label > >Hello all, > >I have to display labels instead of points on a layer. The labels rely on >an attribute value. I would like to click on the label to make an >attribute windows open up. So far, no problem with mapfile >configuration... > >The only thing is that the attribute window opens up when I click right >in the middle of the label. I can use TOLERANCEUNITS and TOLERANCE >parameters in the mapfile to enlarge the clickable area BUT this means >that I can also click next to the label and get the attribute window, >which I don't want to... > >My purpose is to get the attribute window whereever I click on the label >(any part of it) and not if I click next to it. Would you think about a >solution to that ? > >I enclose a scrennshot of the mapfile I have worked out so far. > > >Many thanks in advance, > >Thomas > > ><http://osgeo-org.1560.x6.nabble.com/file/n5097281/mapfile_label.jpg> > > > >-- >View this message in context: >http://osgeo-org.1560.x6.nabble.com/Clickable-label-tp5097281.html >Sent from the Mapserver - User mailing list archive at Nabble.com. >_______________________________________________ >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 > >_______________________________________________ >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
