[whatwg] isPointInPath on Path object
ian at hixie.ch
Thu Sep 20 17:12:00 PDT 2012
On Thu, 20 Sep 2012, Dirk Schulze wrote:
> The interface of CanvasRenderingContext2D currently has a function
> called isPointInPath() with a Path object as input . I wonder why
> this needs to be on the context interface. Wouldn't it make more sense
> on the interface of Path object itself? If an implementation really
> needs a context to get a point on a path it, it can create it on it's
I don't think it would make _more_ sense, but I agree that it would make
equal amounts of sense.
In practice you're pretty much always going to have a context around when
you want to check this, because the reason you'd use it is to see where I
mouse click landed on a canvas. And you're going to want the Path object
transformed as per the transform on the canvas, generally speaking.
> The only situation that might be reasonable would be a transform on the
> Canvas that an author want to cover in the Path. But for the rare case
> where this matters, you can create a new Path object, add your path with
> the transform and call isPointInPath.
Yeah, you could do that too.
> Furthermore, a transform() function that applies to a Path object seems
> to be useable as well.
You can create a new Path, then add another Path to it while applying a
transform, using the addPath() method.
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
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