Re: Canvas

Laurens Holst schreef:
> Andrew Fedoniouk schreef:
>>> <canvas> is a dynamic image that can be generated on the fly via JS. 
>>> There is usefulness to this model, since it allows you to build the 
>>> bitmap once and then treat it like an image from that point on.
>>
>> If it is just an image then what was/is wrong with existing Image object
>> and <img> that are there from the primordial Navigator?
>>
>> <img id="canvas" src="placeholder.gif" />
>>
>> <script>
>>   var img = $("#canvas");
>>   var gfx = img.graphics( 300,300, "white" );
>>   gfx.line(...);
>> </script>
>>
>> or so.
>
> Ah, yes, I think this is a very good idea! ‘1+’, so to say :).
>
> The reference to ‘placeholder.gif’ even seems excessive; only if you 
> want to have a fallback image. The default form would be simply 
> <img/>. It would basically mean slapping on the <canvas> API to <img>. 

Ah, no, never mind, this wouldn’t work.

The problem is the fallback behaviour of <img>. If the source file 
doesn’t load, or is not present, it falls back to the alternate content, 
and there is no longer a canvas present to draw on.  <canvas> in the 
contrary always creates the canvas, unless it’s not supported by the 
browser.


~Grauw

-- 
Ushiko-san! Kimi wa doushite, Ushiko-san nan da!!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Laurens Holst, student, university of Utrecht, the Netherlands.
Website: www.grauw.nl. Backbase employee; www.backbase.com.