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Index › Programming Questions & Help › Programs › How does dist() work
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How does dist() work ? (Read 471 times)
KaL
How does dist() work ?
Apr 3rd, 2006, 3:37am  
I'm currently working on a C++ port of a Processing color tracker.
So I had to write the Euclidian distance function to compare colors. But I don't know If I did it well. With the processing version, everything was ok. But mine seems to be  hazardous :/

Here's my code :
double nsPerform::Distance(int x1, int y1, int z1,
int x2, int y2, int z2)
{
double pol;
//v(x2-x1)² + (y2-y1)² + (z2-z1)²
pol = ((x2-x1)*(x2-x1)) + ((y2-y1)*(y2-y1)) + ((z2-z1)*(z2-z1));
return (sqrt(pol));
}

Could someone post the processing version source ?
Thanks
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kidult
Re: How does dist() work ?
Reply #1 - Apr 3rd, 2006, 4:13am  
float distance(int x1, int y1, int z1, int x2, int y2, int z2)
{
float pol = sq(x2-x1) + sq(y2-y1) + sq(z2-z1);
return sqrt(pol);
}

or

you can use the processing method
http://processing.org/reference/dist_.html
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mflux
Re: How does dist() work ?
Reply #2 - Apr 3rd, 2006, 10:29am  
Basically, Pythagorean theorem
http://en.wikipedia.org/wiki/Pythagorean_Theorem

Pythagoras would be proud.
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