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## Math Check: Distance Between 2 Obbjects

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### #1Code Fox  GDNet+

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Posted 14 January 2012 - 01:01 PM

I would like to knoow if my math is correct in calculating the distance between 2 objects on a 2D plain:
def distance(x1,x2,y1,y2):
# A squared + B squared = C squared
return ( ( (x2 - x1)**2) + ( (y2-y1)**2) )**.5
# Object 1 Location
coordinate1 = 2,8	 # x,y
# Object 2 Location
coordinate2 = 5,10	 # x,y
print (distance(coordinate1[0],coordinate2[0],coordinate1[1],coordinate2[1]))

Thanks.

I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.

~ Ralph Waldo Emerson

### #2jjd  Members

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Posted 14 January 2012 - 01:15 PM

I would like to knoow if my math is correct in calculating the distance between 2 objects on a 2D plain:

def distance(x1,x2,y1,y2):
# A squared + B squared = C squared
return ( ( (x2 - x1)**2) + ( (y2-y1)**2) )**.5
# Object 1 Location
coordinate1 = 2,8	 # x,y
# Object 2 Location
coordinate2 = 5,10	 # x,y
print (distance(coordinate1[0],coordinate2[0],coordinate1[1],coordinate2[1]))

Thanks.

Yes, that is correct.

-Josh

--www.physicaluncertainty.com
--irc.freenode.net#gdnet

### #3HappyCoder  Members

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Posted 14 January 2012 - 01:16 PM

yup. That distance equation will give you the distance between two points.
My current game project Platform RPG

### #4Cornstalks  Members

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Posted 14 January 2012 - 01:16 PM

Holy crap! Ninja'd twice!
[ I was ninja'd 71 times before I stopped counting a long time ago ] [ f.k.a. MikeTacular ] [ My Blog ] [ SWFer: Gaplessly looped MP3s in your Flash games ]

### #5Code Fox  GDNet+

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Posted 14 January 2012 - 01:42 PM

Thank you.

I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.

~ Ralph Waldo Emerson

### #6Narf the Mouse  Members

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Posted 16 January 2012 - 03:37 PM

As a side note, it's also useful to include a "DistanceSquared" function, which omits the square root - If you're simply comparing which is farther, and don't need to know how far, omitting a costly square root can save significant time in time-sensitive applications.

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