pointtopoint() - Printable Version

pointtopoint() - Printable Version

+- SA-MP Forums Archive (https://sampforum.blast.hk)
+-- Forum: SA-MP Scripting and Plugins (https://sampforum.blast.hk/forumdisplay.php?fid=8)
+--- Forum: Scripting Help (https://sampforum.blast.hk/forumdisplay.php?fid=12)
+---- Forum: Help Archive (https://sampforum.blast.hk/forumdisplay.php?fid=89)
+---- Thread: pointtopoint() (/showthread.php?tid=188161)

pointtopoint() - legodude - 06.11.2010

is there a function to calculate the distance between points?

if there's not can someone create one please?

Re: pointtopoint() - Mauzen - 06.11.2010

There are loads of them, i prefer using a fast plugin-based.
But this one should do its job too

pawn Код:

stock Float:PointToPoint(Float:x, Float:y, Float:z, Float:xx, Float:yy, Float:zz)
{
    return floatsqroot( (x - xx) * (x - xx) + (y - yy) * (y - yy) + (z - zz) * (z - zz) );
}

(untested)

Re: pointtopoint() - legodude - 06.11.2010

isnt that pythagoras?

Re: pointtopoint() - DeathOnaStick - 06.11.2010

Quote:

Originally Posted by legodude

isnt that pythagoras?

Pythagoras:
aІ+bІ=cІ

We've got:
xІ+yІ+zІ=aІ

It has it's origin from Pythagoras, but we just added another dimension.
Proof that it works:

Imagine the world would be a coordination system. We've got a triangle, so we first use Pythagoras to get the distance of the points on the ground level:
xІ+yІ=d(xy)І

d(xy) means the distance, from X to Y.

Now, when we've got the ground level, we add the altitude, Z. We get this:

d(xy)І+zІ=d(xyz)І

Now we can easily replace d(xy)І with xІ+yІ. What we get looks like this:

xІ+yІ+zІ=d(xyz)І

We want d(xyz), not d(xyz)І, so we use the squareroot. Now we've got:

√(xІ+yІ+zІ) = √d(xyz)І = d(xyz)

I don't know if this was necessary for you, but it might help some people to understand the background of the code.

Re: pointtopoint() - legodude - 06.11.2010

so its 3 dimensional pythagoras?

kewl xd