Coding Math: Episode 5 - Arctangent

Arctangent is another trig function that has at least one extremely useful application - making one object rotate to point at another one.

[ashutoshrautela]

Ok.. let me confess.. This guy is brilliant as he understands the struggle a programmer faces when he is not in touch with basic maths principles.. These videos are short, simple, to the point and extremely helpful. You rock.

[fedejumphat]

Your videos are great, I cant remember when I last learned so much in such a short amount of time. Thank you!

[meraklmuskulpesent]

Dude, I've known how to use atan2 to rotate stuff, but I had not been aware of the logic behind it until I watched your video. Thank you so much! I hope you produce more tutorials in future.

[SamVsCode]

So cool. You are making math fun again. :)

[justsomedude]

Thank you Coding Math. New favorite channel.

[williamschneidereith]

Thank you so much for showing the atan2 function. Solved all of my problems that I've been struggling with!

[frassmicce]

This is awesome stuff. I'm learning to code animations. Thank you so much bro!

[CaptainWumbo]

I was going to try teaching myself math using code. Now you've done it for me!! Thanks a tonne for these awesome videos.

[P]

This tutorial was simply amazing. Clear and straight to the point.

[neuro]

Wow that is cool. You get around the limitations of tan returning a radian that could be infinity by using arctan to return a degree which doesnt have any limitation

[radx]

It was very useful. Again it worked straight out of the tin!

[kaiwenli]

this is absolutely amazing. Thank you!

[kaiotellure]

dude ur making me fall in love for math...



MATH

[DanYami]

OOOOHHH so it's the -1 thing, thanks for clearin that up fam :V

[Keeykey]

How would you go about tracking the mouse position without the
"mousemove" event? I want the arrow to point at the mouse at all times,
not just when it moves.

Awesome video series, I'm learning a lot.

[DoraKage]

Thank you for this. I gather this works for a 2D plane, but if i wanted to handle this in 3D space do i use a different type of math? Say... vectors?

[rayerdinc]

Really enjoying this series, it explains the maths so well with the theory drawings, then code and execution. However, I am having problems when running, for example the code at 7:44 draws the arrow but no movement e.g. following the mouse.

Your code for this lesson works and I have read the video and my code several times now but no mistakes or should be working as I get the arrow.  I am using Chrome and Atom as my editor.

Just cannot see why not working, any ideas please, don't want to move to next part of this lesson as it may not work if this isn't.

[camsolo]

Awesome. Is it possible to achieve the same with say math.sin2() and math.cos2() if such functions exist?

[pwrmoses]

This upside down right triangle is really salting my vibe, I'm struggling to process it

[tundrummax]

What happens if you don't move the mouse in the last bit?