Missed a couple counterclockwise corrections.

Author: synesthete

chapters/animation/chapter.md

@@ -231,7 +231,7 @@ Here's a simple drawing that helps explain sin and cos.
 
 ![sin](images/atob_circle.png)
 
-All you have to do is imagine a unit circle, which has a radius of 1 and a center position of 0,0.  Now, imagine a point moving counter clockwise around that point at a constant speed.  If you look at the height of that point, it goes from 0 at the far right (3 o'clock position), up to 1 at the top (12 o'clock), back at 0 at the left (9 o'clock) and down to -1 at the bottom (6 o'clock).  So it's a smooth, curving line that moves between -1 and 1.  That's it.  Sin is the height of this dot and cos is the horizontal position of this dot.  At the far right, where the height of this dot is 0, the horizontal position is 1.  When sin is 1, cos is 0, etc.   They are in sync, but shifted. 
+All you have to do is imagine a unit circle, which has a radius of 1 and a center position of 0,0.  Now, imagine a point moving counterclockwise around that point at a constant speed.  If you look at the height of that point, it goes from 0 at the far right (3 o'clock position), up to 1 at the top (12 o'clock), back at 0 at the left (9 o'clock) and down to -1 at the bottom (6 o'clock).  So it's a smooth, curving line that moves between -1 and 1.  That's it.  Sin is the height of this dot and cos is the horizontal position of this dot.  At the far right, where the height of this dot is 0, the horizontal position is 1.  When sin is 1, cos is 0, etc.   They are in sync, but shifted. 
 
 #### Simple examples
 
@@ -298,7 +298,7 @@ float x = xorig + radius * cos(angle);
 float y = yorig + radius * sin(angle);
 ```
 
-*Note: In OF, the top left corner is 0,0 (y axis is increasing as you go down) so you'll notice that the point travels clockwise instead of counter-clockwise.  If this bugs you (since above, I asked you imagine it moving counter-clockwise) you can modify this line `float y = yorig + radius * sin(angle)` to `float y = yorig + radius * -sin(angle)` and see the circle go in the counter-clockwise direction.*
+*Note: In OF, the top left corner is 0,0 (y axis is increasing as you go down) so you'll notice that the point travels clockwise instead of counterclockwise.  If this bugs you (since above, I asked you imagine it moving counterclockwise) you can modify this line `float y = yorig + radius * sin(angle)` to `float y = yorig + radius * -sin(angle)` and see the circle go in the counterclockwise direction.*
 
 For these examples, I start to add a "trail" to the object by using the ofPolyline object. I keep adding points, and once I have a certain number I delete the oldest one. This helps us better see the motion of the object.