2014-07-02 1:30 GMT+02:00 Phil Scadden <p.scad...@gns.cri.nz>: > On 2/07/2014 10:51 a.m., Rob Marjot wrote: > >> >> >> One approach could be to start the download of vector geometries only >> after finish rendering the WMS map. So, the user can already start reading >> the map, deciding what to hover over. By that time, ((over)simplified) >> vectors will nicely have been received and rendered, so the actual >> highlighting will work. Thus implemented, I'm expecting a better user >> experience that requiring the user to wait for 1 second again-and-again for >> each hovered pixel / location. >> > So logic then would be for an onmove event to make a serverside call with > BBOX which does WFS to fetch the vectors, and then then simplify > (generalise) the geometry before passing them to the application. I remain > uncertain as to whether putting them into canvas coordinates would give you > the required time-boost. I would try NOT converting to canvas and seeing > how you go but use the NET tab of debugger to time the download. If you > convert to canvas, then you are going to have move outside OL for the > drawing and mouse handling. It still wouldnt work in my application as even > simplified to extreme (start and end point), I would have more than a 5000 > objects to send down the web and render with only moderate zoom out. The > web still imposes limitations on what can be done.
Yes; onZoom, onPan events would trigger a serverside call to fetch the vectors for the given BBOX. Very true that I should first take this approach based on worldly coordinates and from there see whether exchange in canvas coordinates is going to improve performance significantly. Thanks. > > Notice: This email and any attachments are confidential. > If received in error please destroy and immediately notify us. > Do not copy or disclose the contents. > > _______________________________________________ > Users mailing list > us...@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/openlayers-users >
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