On 3 Dec 2013, at 12:05 pm, Leonardo <[email protected]> wrote:

> But of course I can¹t
> expect other apps do the same job when I paste the text.

No indeed. The problem lies with Apple’s decision to let shadows ignore the 
CTM. You need to file a radar with an enhancement request. It’ll be a dupe.

Alternatively, since you are able to grab the change in scale and update your 
shadow, you could just use those numbers to assign a standard shadow. Instead 
of storing your shadow values in a shadow subclass, you could add a custom 
attribute to the text (attributes are just a dictionary, you can add any keys 
you want of your own as long as they can’t be mistaken for a standard one) and 
use it to manipulate the standard shadows, which will then be pasteable in 
another app.

> Yes, I scale the blur too, but as I can see, it should not scale *linearly*
> with the scaleFactor. I am still looking for a better function.

I believe it should scale linearly. It’s a *radius*, so it is related to the 
geometry of the context. What you may be seeing is that for very small radii 
drawn at a small scale, there are very few pixels to spread the blur across, so 
it’s not being anti-aliased very well. As you zoom in, there are more pixels 
available so the blur becomes more accurate. And much slower ;-)

—Graham
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