Help: Multiple values for a rounded corner? What does it mean?

[vaaski]

Hey, I am trying to make a magsafe accessory for my iPhone in openscad and I found this excellent specsheet of the phone directly from apple, but the rounding of it's corner isn't a trivial single value that I can wrap my head around as a (web-) dev.

there are 6 values for one rounded corner

I've done some digging but can't really pinpoint anything, here are some things that might be related:

• Superellipses - might go into the right direction but doesn't explain multiple values
• in-depth analasys of apple's squircle icons - too technical for me to understand :(
• unrelated iphone fish fillet case - didn't expect this showing up when researching fillet

I'd be very grateful if someone could point me in the right direction on how to use multiple values for a rounded corner

_{related: idcrook/psychic-winner#2}

[Irev-Dev]

My guess is they're just giving a bunch of coordinates on the curve and it's a spline linking them all up, they clearly show the datum as the top left corner. I would probably just try plugging the coordinates into a spline and use BOSL https://github.com/revarbat/BOSL2

[vaaski]

thank you so much! i‘ll look into that!

[vaaski]

After finally sinking another couple hours into this today I think i finally solved it!
Your assumption was spot on, but at first I was getting results that were way to round, similar to idcrook/psychic-winner#2

red is from the spec sheet (page 199), converted to svg and imported into openscad for comparison

In the end my mistake was to not include 0 in the array of coordinates, now it's perfectly spot on!

[Irev-Dev]

A happy ending! so good 🎉