@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.