Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial


s t
s t
2,699 Points

Swift Methods X and Y Range

Hi, I am having brain block, and I need further explanation of this part at 10:06 of the video. I understand x and y coordinates but this part is not sticking for me.


This range of values for both x and

y are essentially x minus the range and y minus the range.