On Thu, May 10, 2012 at 6:37 AM, John Donovan <mersey.vik...@gmail.com> wrote: > I'm very interested in user-definable grid functionality, and I was > planning on implementing something myself for a plugin I'm writing. My > needs are to have the grid set to an arbitrary angle, and ideally to > know which grid square the user has clicked in, relative to a > user-defined origin.
Can this angle be defined in terms of a projection, or is rather arbitrary with an origin and angle, relative to current projection? Could your needs be met with a (polygon) vector layer, which allows you to select one of the polygons? > > If anyone wants to collaborate, or just has ideas on how best to > implement it, let me know. > > Regards, > JD > > On 10 May 2012 05:35, Alister Hood <alister.h...@synergine.com> wrote: >>> Date: Wed, 9 May 2012 18:00:07 -0300 >>> From: Etienne Tourigny <etourigny....@gmail.com> >>> Subject: [Qgis-developer] show grid on map canvas (similiar to grid >>> used in composer) - strategy? >>> To: qgis-developer <qgis-developer@lists.osgeo.org> >>> Message-ID: >>> <ca+txyvpd-5vhoycx4uhio9x416hkx9zgeq5ennnqvadp0l9...@mail.gmail.com> >>> Content-Type: text/plain; charset=ISO-8859-1 >>> >>> Hi all, >>> >>> I would like to add support to draw a grid on the map canvas, in a way >>> similar to what is done in the map composer (although perhaps without >>> the annotations on the borders). >>> >>> What should be the approach used? >>> >>> 1) plugin or core? >>> 2) rubberbands or basic plot functions triggered after mapCanvas update? >>> >>> I think both drawing strategies are possible using a plugin. >>> >>> It would be best to write in the core, assuming there is sufficient >>> interest in this, but it will take time to trickle down to the stable >>> version (an argument for making it a plugin). >>> >>> I know the current workaround is to create a vector grid with ftools, >>> but that is a little clunky. >>> >>> Any thoughts? >>> Etienne >> >> Hi, >> I'm not a developer, so this might be a crazy and unnecessary idea, but >> would it be feasible to create a graticule _provider_? >> >> This approach would mean that like grids created with ftools, the grid would >> be created as a layer, but it wouldn't be file based and its extents would >> automatically update. >> >> Unlike the approach used in the composer, this would mean: >> - digitising tools could snap to the grid lines. >> - the identify tool could identify the grid lines. >> - the layer could be used for analysis (e.g. you might want to use it to >> split vector layers). >> - symbology and feature labelling could work just like other vector layers. >> >> If this was to actually replace the grids in the composer, some improvements >> to feature labelling would be needed. Some of these would probably be good >> to have anyway, e.g. an option to label both ends of a line, and an option >> to align labels horizontally or vertically on the page, rather than N-S or >> E-W. I guess the difficult one would be providing a way to display labels >> outside the map frame... >> >> Regards, >> Alister_______________________________________________ >> Qgis-developer mailing list >> Qgis-developer@lists.osgeo.org >> http://lists.osgeo.org/mailman/listinfo/qgis-developer > > > > -- > One of the advantages of being disorderly is that one is constantly > making exciting discoveries. - AA Milne > _______________________________________________ > Qgis-developer mailing list > Qgis-developer@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-developer _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
