I got the angles to work with atan2(), and added some procedures and generic events to cut the block count way down.
QuickBikeSetup.aia (1.2 MB)
These 3 procedures do the angle calculation:
I divided up the different problems by procedure:
- relations between balls
- modelling the joint ball as the (x,y) origin for angle calculation
- normalizing the angles into acute range 0 <= angle <= 180
Calling the procedures to update the display:
General cleanup of redundancy:
Sample run (I had to add Labels because I couldn't remember which Label held what angle)
(i don't know why your range tests colored my numbers red, but the angles look reasonable.)
And finally, this is a problem
See the article on opening Screen1 at