 |
Author |
Topic: calculating angles... basic trig help (Read 571 times) |
|
aadigi
|
calculating angles... basic trig help
« on: Mar 13th, 2004, 7:40am » |
|
Hi,
I'm trying to wrap my head around some basic trigonometry for a more complex project I'm working on. So I decided to make a really simple visualization of a right triangle that calculated all the angles, but after messing around with atan2() over and over, I'm stumped. I know this is incredibly novice, but I can't get my brain and trigonometry to get along. Any help is much appreciated. The applet I started is here:
http://www.a2l2.com/~aaron/trigDemo/
Thanks.
-Aaron
|
|
|
|
|
fry
|
Re: calculating angles... basic trig help
« Reply #1 on: Mar 13th, 2004, 8:34pm » |
|
atan2 will return the size of your angle 'a', in radians, which might be what's throwing you off. so your function would look like:
float a = degrees(atan2(heightoftriangle, widthoftriangle));
the degrees() function converts from radians to degrees, so a will now be in degrees.
then, since c will always be 90, so angle b will be 90 - a.
i never really got along with trig until i started programming graphics, at which point i found that there are just a few things you have to learn (like how atan2 works) and you'll be set to go.
good luck!
|
|
|
|
|
aadigi
|
Re: calculating angles... basic trig help
« Reply #2 on: Mar 13th, 2004, 9:02pm » |
|
thanks fry.
actually, in the context of my applet the atan2(heightoftriangle, widthoftriangle) actually gives the angle of angle b.
http://www.a2l2.com/~aaron/trigDemo01/
i was a little confused by the example here: http://processing.org/reference/atan2_.html
where does using translate() fit in? i guess its not necessary because I got my applet working correctly without it.
anyway, thanks for helping me through my trigonometry problem.
|
|
|
|
|
|
