>Am Mittwoch, 25. Juli 2007 schrieb Rob Desbois:
>> Yes, sorry I didn't phrase my post very well: there is a URL for the
>image,
>> of course, but I was trying to emphasise that there isn't a URL to an
>image
>> cached on the server's filesystem to pass back, as I don't want to
>> *permanently* cache the image (or implement a cleverer algorithm -
>there's
>> no need).
>> I simply want the cached image (or intermediates) to be temporary; the
>> user's session seems the obvious candidate for this type of storage to
>me.
>
>var ctx = $('canvas')[0].getContext("2d");
>var img = new Image();
>img.onload = function() {
> ctx.drawImage(img,0,0);
> ctx.beginPath();
> ctx.moveTo(30,96);
> ctx.lineTo(70,66);
> ctx.lineTo(103,76);
> ctx.lineTo(170,15);
> ctx.stroke();
> // ...
>}
>img.src = "/basicImage.png";
I believe the ctx variable should be:
var ctx = $('<canvas>')[0].getContext("2d");
The $('canvas') would be looking for an existing canvas tag, where
$("<canvas>") will create one (just like document.createElement("canvas")
would.)
-Dan
