angleMode Not working?

m4ge

Hi everyone,

So I'm doing some work with angles/trigonometry, but for some reason angleMode(DEGREES); does absolutely nothing. If I run angleMode(DEGREES); Math.sin(90); in the console I got the value of sin(90 radians) instead of the value for degrees.

Chrisir

just use

sin(radians(90)); 

;-)

m4ge

That doesnt seem to work for sin(radians(180)); where you'd expect 0 but you get '1.2246467991473532e-16'

Chrisir

I think that's okay, that's only when you print it out

To remove digits from a floating-point number, use the int(), ceil(), floor(), or round() functions.

https://www.processing.org/reference/

here is an example for sin(radians(180));

Chrisir

[EDITED]

int a;   // angle 
float x1=0;

void setup() {
  size(1280, 480);
  background (100, 0, 0);
}

void draw() {

  float a1=100*sin(radians(a));
  text("webcam", x1, a1+200);

  a++;
  x1++;
}
//

m4ge

That seems to be processing code, not p5.js code, but regardless it just doesn't work. Also, I can't use rounding as it would be inconsistent: through some magic or dumb luck things have now magically changed and the values are close to correct but not quite: sin(radians(180)) gives 0.0548036651... while cos(radians(180)) gives 0.9984971...

Chrisir

interesting

probably rounding errors or so

I dunno

;-)

GoToLoop

• angleMode(): https://p5js.org/reference/#/p5/angleMode
• Only changes the input values for p5.js' own math & p5.Vector trig. methods. L-)
• The output though continues to be always in radians! 8-}

https://Forum.Processing.org/two/discussions/tagged?Tag=anglemode()

GoToLoop

An online p5.js sketch using angleMode() in DEGREES: :bz
http://Bl.ocks.org/GoSubRoutine/a117ecb16a8b0f939a190f87d3a13267
https://KhanAcademy.org/computer-programming/3d-tutorial-4/1648921303