Calculating Distance Between 2 Chars

[nico173]

How would I go on about to calculate the distance of 2 characters. Calculating only the _x-axis between the two. And how would I go on to make a certain action if a certain distance between the two is reached?

Thanks in advance.

[TheCanadian]

One Dimension:
d = x1 - x2

Two Dimension:
d = sqrt((x1 - x2)^2 + (y1 - y2)^2)

[Joppe]

Canadian, I tought for one dimension you had to do something like this
d = x1._x - x2._x
distance = Math.sqrt(d*d)

[stoodder]

Canadian, I tought for one dimension you had to do something like this
d = x1._x - x2._x
distance = Math.sqrt(d*d)
actually you juist take


d = x1._x - x2._x
then d = Math.abs(d); // take the absolute value

[cobrasniper555]

Stooder is right, one dimension woud be:
d = x1._x-x2._x
d = Math.abs(d);
But...the problem is, there can be 2 x-distance values.
d = x1._x-x2._x;//The first one
d = x2._x-x1._x;//The second one

[Joppe]

^Cobra, both of those two will give the same outcome.. Aswell as the code I wrote, all is correct :s

[stoodder]

^Cobra, both of those two will give the same outcome.. Aswell as the code I wrote, all is correct :slol ya i sjut relized all ur code did was trurn the nmber posotive XD but i think what he means is one will giv eyou a negative distance i fyou dont take its absolute value, dunno fi theres any value in that information in this project but none the less

[TheCanadian]

Canadian, I tought for one dimension you had to do something like this
d = x1._x - x2._x
distance = Math.sqrt(d*d)
Guess what the square root of a number squared is ;)

The sign of the distance depends on which position you use as your reference.

[NiñoScript]

yep, thats right :)
if you need to know if its on the left or the right, the answer is:
d = x1 - x2

but if you just need the distance (which in fact is an absolute value)
d = Math.abs(x1 - x2)

... note that with bidimensional distance, d will always be absolute, soo to know where is the other object, you need an angle. I mean, you'll need trygonometric functions to calculate the angle of the distance vector. (Math.atan2() should work in that case ;))