Transparent Strokes possible?

[Bernd L]

I am in the process of designing an icon for a circular slider. To create a transparent area around the thumb of the slider I have tried to use the transparency settings of the stroke. Unfortunately the results were at least unexpected for me.

The Slider consists of two donuts and a circle where its stroke should be transparent when exported into a slice. In the image, I used white as a stroke color to show which area should be later transparent.

If I just change the transparency of the stroke the following happens:

 

What I do not understand is, that the fill is now occupying the area of the stroke...

Any help is appreciated. Even a workaround on how to create a final slice with the desired effect.

Cheers,

Bernd

[Gabe]

Hi @Bernd L,

Welcome to the forums. 

You have 2 different objects. Making the stroke of that circle transparent will not create a "hole" in the other shape. 

What you need to do is to duplicate the circle. One copy should have no stroke ( you can hide this one for now), and the other one should only have stroke. Set your stroke alignment to  "outside". With the "only stroke" layer selected, expand stroke. Now select both the Pie and the Stroke layer and Subtract  . You will now have the pie shape with a cut-out of your stroke. Unhid that layer and now you have a transparent "gap". If you need to delete that extra "pie" from underneath the circle", With the pie layer selected, choose Divide -  . Delete the unnecessary shape and you're good to go. 

Thanks,

Gabe. 

[Bernd L]

Thank you for the very fast reply. I have a partial success.

Thats the setup before the substract:

The layers:

After substract:

Here you can see its an outside stroke

Layers after subtraction:

Unfortunately, the fill instead of the outside stroke is subtracted.

Did I miss something?

 

 

[R C-R]

8 hours ago, Bernd L said:

Did I miss something?

I think you missed the Layer menu > Expand Stroke step on the "only stroke" layer. When I do that on my Circular Slider test.afdesign file, I get a "(Curves)" object (which I named "Expanded" in my test file) -- essentially the same as a donut converted to curves because after expansion it has both an outer & inner curve. To keep things simple, if you are going to do it this way, I suggest using the Divide boolean to break it into separate curves & deleting the smaller one.

Because you have 2 donuts, you will need to duplicate the remaining larger curve so that you can subtract one of them from each of the two donuts, resulting in something like this Circular Slider test finish.afdesign.

[Bernd L]

I was now able to reproduce the desired effect.

Thanks a lot!

[Pšenda]

It is a pity that you can not use Blend mode type Erase at Outline. This would be great for this case: group Slider with Circle (circle is top), at Circle set Outline with Erase mode.

Question on dev. Why can not set Erase mode on Outline?