[mercury-users] Wishes for 0.13.1

[Peter Stuckey]

On 23/10/2006, at 9:57 PM, Julien Fischer wrote:

>
> On Mon, 16 Oct 2006 doug.auclair at logicaltypes.com wrote:
>
>> Dear Julien,
>>
>> If you will be adding rtree to 0.13.1 (which I hope you do, as I  
>> am now
>> using it quite a bit), I have a small ordering request:  one of  
>> the provided
>> types, box3d, has this ordering:
>
> rtrees have now been added to the 0.13 branch - so they should  
> appear in
> 0.13.1.
>
>> box3d(xmin, xmax, ymin, ymax, zmin, zmax).
>>
>> I understand the implementation point, but, declaratively, it's  
>> weird.  I
>> expected a box to be defined thus:
>>
>> box3d(xmin, ymin, zmin, xmax, ymax, zmax).
>>
>> and have run into logic errors in my programs when I trip up on my
>> disconnect.
>
> It makes sense to me: the first two coordinates specify the x  
> dimension,
> second two coordinates specify the y dimension, and so on.
>
> If that arrangment is tripping you up then you could either:
> (a) create your own box3d-like type that has the arguments around  
> the way
>     you want
>
> or
>
> (b) write a function that creates a box3d, like this:
>
> 	create_box3d(XMin, YMin, ZMin, XMax, YMax, ZMax) =
> 		box3d(XMin, Xmax, YMin, YMax, ZMin, ZMax).
>
>
>> If there are no objections, could the definition of box3d be  
>> changed to the
>> latter?  (The declaration is unchanged).
>
> Either way is going to require you to remember what order the  
> arguments
> appear in - I guess it just a matter of taste but I don't really see
> much point in changing it.
>
>> If the same setup exists for the 'box' type, could the same  
>> implementation
>> change occur?
>
> The box (or is it box2d?) type is implemented in a similar fashion;
> again I'm not inclined to change it.

The underlying question is really

	"What is the NATURAL way of ordering boxs"

is it lexicographically by (XMin, XMax, YMin, YMax) or by (XMin,  
YMin, XMax, YMax)

Thats the only difference I can see in the two implementations

Peter

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