Re: 1-based indexing in Lua or the one without zero

[KHMan <keinhong@...>]

On 4/24/2018 5:10 PM, Axel Kittenberger wrote:
>     In my opinion we should bring back the old compromise of
>     starting arrays at 0.5
>
>
> I was going to make that argument. It's not about counting, it's 
> about indexing and when you think about lining up objects on a 
> tape, the first item starts at position 0 and stops at position 1 
> -- I hope there is no doubt about that. As the first centimeter on 
> the tape starts at zero and stops at centimeter one. The question 
> in addressing is then, do you specify start or stop positions. And 
> actually one can make an argument to specify the middle.. and this 
> is exactly what HTML5 canvas does. If you want to draw the top 
> pixel line, it's position is 0.5 -- as long devicePixelRatio is 1 
> to keep things not extra complicated, which they can on nowadays 
> common HiPDI screens. But do be fair, HTML5 canvas wanted to 
> abstract Pixels away, that's way the result if one want to draw a 
> line on a pixel boundary, the result is the somewhat comically n 
> dot 5.

This is in a lot of OpenGL stuff, and it has to do with rendering. 
Can't remember, probably a position marks the center of the pixel. 
Traditional bitmap blitting is only a small subset these days, so 
stuff tend to be derived more from OpenGL and other 3D graphics 
libs, hence the appearance of 0.5. Nothing surprising actually, 
all reasonable stuff.


> @Dirk, well about retelling old jokes: Okay, so at those times 
> when most people where doing stuff byusing only ones and zeros, 
> you only used ones.


--
Cheers,
Kein-Hong Man (esq.)
Selangor, Malaysia