Hi Kris, Am I correct in thinking this technique would be useful for displaying read-only vector data only? Or are you considering an approach such as overlaying a transparent image map to allow interactivity?
Cheers Adam On Thu, Nov 19, 2009 at 8:58 PM, Kris Geusebroek <kgeusebr...@xebia.com> wrote: > Hi Eric, > > Indeed it's cool, thanks. > My goal was to write an application with open source technologies to > track cars driving around. > I wrote a prototype with geoserver and openlayers and this was > succesfull. The big problem was the memory consumption (especially in > IE) because of the large amount of DOM manipulation that is done when > panning and zooming and drawing vector's (the cars, with fills, stroke, > label etc.) > > Since using a plugin is out of the question here I began investigating > the html5 canvas. > I know it's not supported in IE, but for me that was a good thing > because it gave me the opportunity to have the client choose a different > browser then IE. > > My plans for the future of the app is to also use workers and the > browser database (to be able to store historical responses clientside to > draw a route the car has followed for the last 10 minutes or so) > > Also I think the canvas gives us the opportunity to create a print > control or a save map as, because in the end it's just an image. (have > to combine the layer specific canvasses into one but that's easy ;-)) > > If you have any other ideas or see different opportunities let me know, > my client is fundning me to experiment with html5 so I might be able to > spent some time on other's feature requests ;-) > > Cheers Kris > > > -----Original Message----- > From: Eric Lemoine [mailto:eric.lemo...@camptocamp.com] > Sent: Thursday, November 19, 2009 6:53 AM > To: Kris Geusebroek > Cc: OpenLayers Users > Subject: Re: [OpenLayers-Users] First try with html5 canvas for layers > > On Wednesday, November 18, 2009, Kris Geusebroek <kgeusebr...@xebia.com> > wrote: >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> Hi All, >> >> >> >> I'm currently investigating the >> possibilities of integrating html5 functionality into openlayers. >> >> My first try is using canvas for a layer >> instead of div's >> >> >> >> I've setup a sandbox which you can >> use to have a look: > http://dev.openlayers.org/sandbox/krisgeus/openlayers/examples/tilecache > Canvas.html >> >> >> >> This is the first example to show it's >> possible ;-). Only features now are zoom and pan without the resize > transition effect. >> >> If anyone has remarks, ideas, feature >> requests, help offerings etc. Feel free to contact me. > > This is cool! > > May I ask what's your goal with displaying tiles using canvas? Is it > performance? I have never played with canvas so I'm interested to know > and talk about what it can bring to OpenLayers. > > Thanks Kris, > > -- > Eric Lemoine > > Camptocamp France SAS > Savoie Technolac, BP 352 > 73377 Le Bourget du Lac, Cedex > > Tel : 00 33 4 79 44 44 96 > Mail : eric.lemo...@camptocamp.com > http://www.camptocamp.com > _______________________________________________ > Users mailing list > Users@openlayers.org > http://openlayers.org/mailman/listinfo/users > _______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users