[BUG] render fails with StackOverflowError on Tutorial 1

[pbouffard]

Describe the bug

The render call in the first tutorial fails once the act! call is introduced to demonstrate animation. The tutorial up to that point works fine, i.e. just rendering the static red and blue circles.

To Reproduce

1. Julia Version (i.e. output of julia -v): 1.7.2

2. Operating system (Mac, Linux, Windows): Mac

3. Javis version (i.e output of ] status Javis in the REPL): v0.8.0#main (same for released version)

4. Minimum working code example that led to bug:5.

using Javis

myvideo = Video(500, 500)

function ground(args...)
    background("white")
    Javis.sethue("black")
end

function object(p=0, color="black")
    sethue(color)
    circle(p, 25, :fill)
    return p
end

Background(1:70, ground) 
red_ball = Object(1:70, (args...) -> object(O, "red"), Point(100,0))
act!(red_ball`,` Action(anim_rotate_around(2π, 0)))

render(myvideo; pathname="circle.gif")

Expected Behavior and Actual Behavior

Expected: Works as per tutorial.

Actual: Error:

javistutorials % julia --project=@. tutorial1.jl                                                                                             8:55:17
ERROR: LoadError: StackOverflowError:
Stacktrace:
 [1] Javis.Rotation(from::Float64, to::Float64, center::Int64) (repeats 79984 times)
   @ Javis ~/.julia/packages/Javis/TCcr1/src/structs/Transitions.jl:40
in expression starting at /Users/patrick/dev/javis/javistutorials/tutorial1.jl:19

[pbouffard]

Ah, should have pushed through a bit more. I realized that I used a 0 instead of an O in the anim_rotate_around call. So much for not copy-pasting example code in order to develop some muscle memory! :)

That said, I wonder if it would help to introduce O separately in the tutorial to better highlight it.