[Openstreetmap] Re: tracklog with voice commentary.

[Jim Ley]

<nick at hogweed.org> wrote in message 
news:200509301135.32726.nick at hogweed.org...
>> I also want to look at an svg/vml in browser editor, I don't think it
>> should be too hard, as the java applet doesn't work for me, and 
>> osm-editor
>> is linux only :-(
>
> With regard to an in-browser editor, have you heard of the new <canvas> 
> tag in
> Firefox 1.5? That could potentially make development of such an 
> application
> (in non-IE browsers at least, Apple's Safari and I believe, Opera are to
> support it) easy; indeed, easier than SVG as DOM manipulation is not 
> required
> - just one method call to draw a line, by the looks of it.

Immediate mode drawing is not actually that useful for this kind of 
application I think, or indeed many on the web - IE has had immediate mode 
2d and 3d since IE4, no-one ever uses it even in IE monocultures because 
it's not all that useful.

The big problem with creating an editor in canvas is that you have to do all 
the mouse click tracking to calculate which point/road/region etc. is being 
clicked on - with the DOM approaches you just add an onclick to a line or 
point and get it all for free.  The code overhead of drawing a line in SVG 
rather than canvas are 2 lines of code, so really not that relevant.  It 
will also mean it can easily be made to work in IE - either via the ASV 
plugin or using VML which shares all the same line drawing capabilities. 
IE's immediate mode is very different from canvas.

I could also put the SVG one directly on my phone for the editing :-)

Cheers,

Jim.