How do I generate rounded terrain?

I'm working on a terrain generator using Perlin Noise (Advanced Random plugin). Pretty happy with my islands, but most of the time they are clipped by edges of the map. I found a good example\solution here, but failing to find a way to implement radial gradient in C3. So...

1. Any suggestions on how to do it that way in C3?

2. Any other ways to make my results "rounded" (i.e. not clipped)?

Check out this post:

construct.net/en/forum/construct-3/how-do-i-8/procedural-terrain-generation-163073

That's it! Thank you, good fellow.