# Not sure why rotation isn't giving certain values
**URL:** https://discourse.processing.org/t/not-sure-why-rotation-isnt-giving-certain-values/31035
**Category:** Beginners
**Created:** [July 4, 2021, 6:29am UTC](https://discourse.processing.org/t/not-sure-why-rotation-isnt-giving-certain-values/31035 "2021-07-04T06:29:06Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@LuckyDots](https://discourse.processing.org/u/LuckyDots)
#### Post date: [July 4, 2021, 6:29am UTC](https://discourse.processing.org/t/not-sure-why-rotation-isnt-giving-certain-values/31035/1 "2021-07-04T06:29:06Z")
Okay so I’ve followed a tutorial on youtube for creating kaleidoscope type images which is from the following link [https://www.youtube.com/watch?v=R3C2giDfmO8](https://www.youtube.com/watch?v=R3C2giDfmO8)
the video is done in p5.js so im not surprised it hasn’t worked exactly as i thought it would.
can anyone help me understand why im not getting a regular pattern of rotation with this code?
```auto
float angle = 0;
void setup()
{
size(900, 900);
background(0);
}
void draw()
{
translate(width/2, height/2);
pushMatrix();
scale(0.5);
angle = 360 /12;
for(float i = 0; i<12; i++){
rotate(angle);
if(mousePressed){
noStroke();
fill(255);
ellipse(mouseX, mouseY, 5, 5);
}
}
popMatrix();
}
```
There are minor differences between this sketch and the one in the video, namely that the drawing function is different and also the line ‘rotate(angle);’ has been changed from ‘rotate(angle\*i);’ the latter produced even less regular patterns which did not seem desirable
I got a little bit closer to my desired result using the following
```auto
float angle = 0;
float angle2;
void setup()
{
size(900, 900);
background(0);
}
void draw()
{
translate(width/2, height/2);
pushMatrix();
scale(0.5);
angle = 360 /12;
angle2 = 16*sin(radians(angle));
for(float i = 0; i<12; i++){
rotate(angle2);
if(mousePressed){
noStroke();
fill(255);
ellipse(mouseX, mouseY, 5, 5);
}
}
popMatrix();
}
```
any help would be greatly appreciated and i hope this is an acceptable posting format, please inform me if theres anything i can do to improve that.
---
### Author:  [@Chrisir](https://discourse.processing.org/u/Chrisir)
#### Post date: [July 4, 2021, 7:32am UTC](https://discourse.processing.org/t/not-sure-why-rotation-isnt-giving-certain-values/31035/2 "2021-07-04T07:32:03Z")
> [@LuckyDots](#):
>
> rotate(angle);
use radians () here
Chrisir
---
### Author:  [@LuckyDots](https://discourse.processing.org/u/LuckyDots)
#### Post date: [July 4, 2021, 8:07am UTC](https://discourse.processing.org/t/not-sure-why-rotation-isnt-giving-certain-values/31035/3 "2021-07-04T08:07:36Z")
you’re a genuis good sir, many, many thanks!
---
### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [July 4, 2021, 10:04am UTC](https://discourse.processing.org/t/not-sure-why-rotation-isnt-giving-certain-values/31035/4 "2021-07-04T10:04:11Z")
> [@LuckyDots](#):
>
> i hope this is an acceptable posting format, please inform me if theres anything i can do to improve that.
Hello,
Please format your code:
[https://discourse.processing.org/faq#format-your-code](https://discourse.processing.org/faq#format-your-code)
Your second example already uses _radians()_ and you are well on the way:
If you work directly in radians you do not have to convert with the _radians()_ function:
```auto
//angle = 360 /12;
angle = TWO_PI/12;
//angle2 = 16*sin(radians(angle));
angle2 = 16*sin(angle);
```
The above could be simplified.
There are resources(tutorials, references, examples, etc.) here:
_[processing.org](http://processing.org)_
And ready to run examples with the Processing IDE:
For starters:
_[rotate() / Reference / Processing.org](https://processing.org/reference/rotate_.html)_
`:)`