arctan

ID:135009
 
Jun 1 2005, 7:59 am
I've been using this (lifted from Nick's SET library)
proc/arctanh(x)
    return log((1 + x) / (1 - x)) / 2

But it fails whenever x is 1 or -1 or whenever it tries to find the log of a negative number. Could we possibly get a hard-coded version of arctan?

In a recent project, I want the player to be able to click a turf and shoot in that direction, which requires getting the angle from the player to the turf.
Jun 1 2005, 11:22 am (Edited on Jun 1 2005, 11:28 am)
This will do for you until then... It's trivial to derive the arctan when all you have to work with is arccos and arcsin.

[link]

Also, arctanh is the hyperbolic arctan, which is one of the reasons it's not working as you'd like ;)
Jun 1 2005, 5:40 pm
In response to tenkuu
tenkuu wrote:
This will do for you until then... It's trivial to derive the arctan when all you have to work with is arccos and arcsin.

[link]

Also, arctanh is the hyperbolic arctan, which is one of the reasons it's not working as you'd like ;)

Thanks! I knew I needed arctan2 but I couldn't find a formula to figure it.