@cancel More of an aside (I'm not recommending it at the API level) but one representation that's often forgotten is center and radius (half-extent) per axis. The center/radius representation of intervals is nice for overlap checking since an interval is just a 1-dimensional disk/ball. So for 2-dimensional rects:

abs(a.cx - b.cx) <= a.rx + b.rx && abs(a.cy - b.cy) <= a.ry + b.ry

Mentioned here, for example: https://fgiesen.wordpress.com/2011/10/16/checking-for-interval-overlap/

@cancel @pervognsen Each has their ideal use case...

pos, size and min, max are good if you're drawing pixels. Which one you like most largely depends if you prefer having -1 in some cases or +1 in others. min, max could be better because you never have to check for zero size (max = pos+size-1).

For bounds like in culling, center, half_extents is convenient.

@cancel @pervognsen

min,max is inclusive
pos,size is exclusive

Let's take for example with integer pixel coords:
min=4
max=6

You would expect a loop over this interval to hit pixels 4,5,6
So it would be for(x=min; x<=max; ++x) {...}

That's equivalent to
pos=4
size=3 (there are 3 pixels in the interval)
And a loop would be for(x=pos; x<pos+size; ++x) {...}

So min=pos, max=pos+size-1
Or pos=min, size=max-min+1

Hope this explanation makes sense...

@skylark13 @pervognsen

i wouldn't expect that to hit pixel 6. i write my loops like,

for (x = min.x; x < max.x; x++) { ..}

@cancel @pervognsen max is max, not size... you're using it as if it were a size.

If you think just of the name, min is the first pixel you loop over, and max is the last one, inclusively. As an analogy, if I say I can pay a maximum of 50$ for something, and someone sells that thing for precisely 50$, then I can buy it, it doesn't have to be 49.99$

So if I say the min pixel is 4 and the max pixel is 6, then I expect to loop over 4,5,6. But yeah, I'm particular about terminology hehehe

@cancel @pervognsen

You're treating it as exclusive. It's fine, as long as that's your convention. I thought my analogy with money was a good one. For me, the term max implies that it is inclusive.

@cancel @pervognsen

Depends on the case, I don't use it everywhere but in some cases it's simpler. Processing tiles where you need the last tile of the previous interval for the next one, and don't want overlap, for example.