[OpenLayers-Users] First try with html5 canvas for layers

[Adam Ratcliffe]

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 <kgeusebroek at 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.lemoine at 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 <kgeusebroek at 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.lemoine at camptocamp.com
> http://www.camptocamp.com
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