On 18-2-2019 10:01, clipka wrote:
> Am 18.02.2019 um 09:53 schrieb clipka:
> 
>> The box _would_ normally have a bounding box of CORNER1 to CORNER2, 
>> but since it's inverted, it has a bounding box of -INFINITY to 
>> +INFINITY. (*)
> 
> Forgot to mention:
> 
> (* Technically that's a simplification, and the true extent is 
> -BOUND_HUGE to +BOUND_HUGE - literally, because that's what the constant 
> is called in the source code. But the principle remains the same.)

My deep felt thanks and appreciation for your patient replies, 
Christoph. I certainly have learned something new here. I shall put that 
to profit.

-- 
Thomas

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