Re: [Visualpython-users] game in python

[Bruce S. <Bru...@nc...>]

I don't understand this syntax. If pos2 and pos1 are intended to stand 
for something like box1.pos and box2.pos, positions of VPython objects, 
then what you need is mag(pos2-pos1), not abs(pos2-pos1).

Bruce Sherwood

Jonathan Brandmeyer wrote:

> On Fri, 2004-05-14 at 09:28, Andrew Williams wrote:
> 
>>On Fri, 14 May 2004 08:53:45 -0400, Jonathan Brandmeyer wrote:
>>
>>
>>>All vectors are always floating-point values in VPython.  If you need to
>>>truncate the precision to an integer type, you will probably need to
>>>write your own round-to-nearest conversion routine since Python only
>>>directly supports truncation of the decimal part.  See math.modf() for
>>>some help here.
>>
>>I'd have thought the 'round' builtin would do just that. It returns a
>>float, but rounded to the specified number of decimal places (if the
>>optional number of decimal places is omitted), so int(round(x)) should
>>always be the nearest integer. 
>>
>>Still, I'd test for collision by specifying a tolerance a bit more
>>explicitly - if pos2 and pos1 are both vectors, this is short and very
>>readable:
>>
>>if abs(pos2 - pos1) < 0.01:
>>  handle_collision()
>>
>>Andrew
> 
> 
> 
> Of course, a built-in function.  I was only looking in the math module. 
> Thanks for clearing this up.
> 
> -Jonathan Brandmeyer
> 
> 
> 
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