[whatwg] Canvas Path.addPath SVGMatrix not optimal?
cabanier at gmail.com
Wed Mar 19 14:47:34 PDT 2014
On Wed, Mar 19, 2014 at 2:22 PM, Justin Novosad <junov at google.com> wrote:
> On Wed, Mar 19, 2014 at 4:46 PM, Dirk Schulze <dschulze at adobe.com> wrote:
> > Hi,
> > I just looked at the definition of Path.addPath:
> > void addPath(Path path, SVGMatrix? transformation);
> > SVGMatrix is nullable but can not be omitted all together. Why isn't it
> > optional as well? I think it should be optional, especially because
> > creating an SVGMatrix at the moment means writing:
> > var matrix = document.createElementNS('http://www.w3.org/2000/svg
> > ','svg').createSVGMatrix();
> > Greetings,
> > Dirk
> > 
> I agree it should be optional, but just to play devil's advocate : you can
> create an identity SVGMatrix with a simpler bit of code. Just do this right
> after creating a canvas rendering context: var identity =
did Blink already expose this property?
As currently specified, this must return a live SVGMatrix object, meaning
that as you change the CTM on the 2d context, your reference to the
SVGMatrix should change as well. 
It's unlikely that you actually want this...
This API should be renamed to get/setCurrentTransform() and return a copy.
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