Question about Javis.jl

[adeil]

Hello, @sudomaze I’m following tutorial 1: Making Your First Javis Animation. However, I do not understand this error warning.

myvideo = Video(500,500)
Background(1:70, ground)
red_ball = Object(1:70, (args...) -> object(0,"red"), Point(100,0))

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

MethodError: no method matching arc(::Cairo.CairoContext, ::Int64, ::Int64, ::Symbol, ::Int64, ::Float64)
Closest candidates are:
  arc(::Cairo.CairoContext, ::Real, ::Real, !Matched::Real, ::Real, ::Real) at C:\Users\adeil\.julia\packages\Cairo\smWIA\src\Cairo.jl:711
  arc(::Graphics.GraphicsContext, ::Real, ::Real, !Matched::Real, ::Real, ::Real) at none:0

Stacktrace:
 [1] circle(::Int64, ::Int64, ::Symbol, ::Symbol) at C:\Users\adeil\.julia\packages\Luxor\Sul91\src\curves.jl:15
 [2] circle(::Int64, ::Int64, ::Symbol) at C:\Users\adeil\.julia\packages\Luxor\Sul91\src\curves.jl:12
 [3] object(::Int64, ::String) at .\In[28]:3
 [4] (::var"#9#10")(::Video, ::Vararg{Any,N} where N) at .\In[29]:3
 [5] draw_object(::Object, ::Video, ::Int64, ::Array{Float64,2}) at C:\Users\adeil\.julia\packages\Javis\ArqyR\src\Javis.jl:342
 [6] macro expansion at C:\Users\adeil\.julia\packages\Javis\ArqyR\src\Javis.jl:289 [inlined]
 [7] macro expansion at C:\Users\adeil\.julia\packages\Luxor\Sul91\src\basics.jl:503 [inlined]
 [8] get_javis_frame(::Video, ::Array{Javis.AbstractObject,1}, ::Int64) at C:\Users\adeil\.julia\packages\Javis\ArqyR\src\Javis.jl:288
 [9] macro expansion at C:\Users\adeil\.julia\packages\Javis\ArqyR\src\Javis.jl:219 [inlined]
 [10] macro expansion at C:\Users\adeil\.julia\packages\ProgressMeter\poEzd\src\ProgressMeter.jl:754 [inlined]
 [11] render(::Video; framerate::Int64, pathname::String, liveview::Bool, tempdirectory::String, ffmpeg_loglevel::String) at C:\Users\adeil\.julia\packages\Javis\ArqyR\src\Javis.jl:218
 [12] top-level scope at In[29]:5
 [13] include_string(::Function, ::Module, ::String, ::String) at .\loading.jl:1091

I have already installed Cairo.jl and Luxor.jl, buti didn’t get successful. How should I proceed?

[cormullion]

Use O rather than 0, perhaps. The 0 should have a slash through it; the O doesn’t.

[adeil]

Okay, I did what you advised. Thank you. the output does not show the image.

Is the problem now that I’m at Jupyter? I’ll try the REPL.

[cormullion]

Yes each environment you use has different abilities with regard to displaying results such as images and animations. Perhaps ask at Javis HQ for guidance as regards Jupyter.

[adeil]

Thank you very much.

Best regards.

[adeil]

Even in Julia REPL the result was the same.

julia> render(
           myvideo;
           pathname="circle.gif"
       )
Rendering frames...100%|████████████████████████████████████████████████████████████████████████| Time: 0:00:05
"circle.gif"

@Wikunia,

What can I do to get the image on the screen?

[Wikunia]

The circle is rendered to the file circle.gif You need to check it out with an image viewer or something like that. If you want to have a live view of the animation you can use:

render(myvideo; pathname="circle.gif", liveview=true)

We are currently working on a solution to display it inside Jupyter and Pluto notebooks.

[adeil]

@Wikunia, should this code snippet show the animation on my screen or should I write it another way?

julia> act!(red_ball, Action(anim_rotate_around(2π,O), liveview=true))

ERROR: MethodError: no method matching Action(::Javis.Rotation{Float64}; liveview=true)
Closest candidates are:
  Action(::Union{Function, Javis.AbstractTransition}; keep) at C:\Users\adeil\.julia\packages\Javis\ArqyR\src\structs\Action.jl:75 got unsupported keyword argument "liveview"
  Action(::Any, ::Union{Javis.ReversedEasing, Animations.Easing}, ::Function; keep) at C:\Users\adeil\.julia\packages\Javis\ArqyR\src\structs\Action.jl:78 got unsupported keyword argument "liveview"
  Action(::Any, ::Union{Javis.ReversedEasing, Animations.Easing}, ::Javis.Translation; keep) at C:\Users\adeil\.julia\packages\Javis\ArqyR\src\structs\Action.jl:81 got unsupported keyword argument "liveview"
  ...
Stacktrace:
 [1] kwerr(::NamedTuple{(:liveview,),Tuple{Bool}}, ::Type{T} where T, ::Javis.Rotation{Float64}) at .\error.jl:157
 [2] top-level scope at REPL[26]:1

[Wikunia]

No you can only apply liveview=true to the render function.
I’m not sure what you mean it should do in your example.

[adeil]

Okay, I’m going to go after I write the code, where do I see the animation?

julia> act!(red_ball, Action(anim_rotate_around(2π, O)))
4-element Array{Javis.AbstractAction,1}:
 Action(Javis.Frames{Symbol}(nothing, :same), Animations.Animation{Float64}(Animations.Keyframe{Float64}[Animations.Keyframe{Float64}(0.0, 0.0), Animations.Keyframe{Float64}(1.0, 6.283185307179586)], Animations.Easing{Animations.FuncEasing}[Animations.Easing{Animations.FuncEasing}(Animations.FuncEasing(Animations.f_linear, ()), 1, false, 0.0, 0.0)]), Javis.var"#52#53"{Point}(Point(0.0, 0.0)), nothing, true, Dict{Symbol,Any}())
 Action(Javis.Frames{Symbol}(nothing, :same), Animations.Animation{Float64}(Animations.Keyframe{Float64}[Animations.Keyframe{Float64}(0.0, 0.0), Animations.Keyframe{Float64}(1.0, 6.283185307179586)], Animations.Easing{Animations.FuncEasing}[Animations.Easing{Animations.FuncEasing}(Animations.FuncEasing(Animations.f_linear, ()), 1, false, 0.0, 0.0)]), Javis.var"#52#53"{Point}(Point(0.0, 0.0)), nothing, true, Dict{Symbol,Any}())
 Action(Javis.Frames{Symbol}(nothing, :same), Animations.Animation{Float64}(Animations.Keyframe{Float64}[Animations.Keyframe{Float64}(0.0, 0.0), Animations.Keyframe{Float64}(1.0, 6.283185307179586)], Animations.Easing{Animations.FuncEasing}[Animations.Easing{Animations.FuncEasing}(Animations.FuncEasing(Animations.f_linear, ()), 1, false, 0.0, 0.0)]), Javis.var"#52#53"{Point}(Point(0.0, 0.0)), nothing, true, Dict{Symbol,Any}())
 Action(Javis.Frames{Symbol}(nothing, :same), Animations.Animation{Float64}(Animations.Keyframe{Float64}[Animations.Keyframe{Float64}(0.0, 0.0), Animations.Keyframe{Float64}(1.0, 6.283185307179586)], Animations.Easing{Animations.FuncEasing}[Animations.Easing{Animations.FuncEasing}(Animations.FuncEasing(Animations.f_linear, ()), 1, false, 0.0, 0.0)]), Javis.var"#52#53"{Point}(Point(0.0, 0.0)), nothing, true, Dict{Symbol,Any}())

[Wikunia]

Currently you build the animation. It needs to be rendered in order to see the gif.

[adeil]

Please, how do I do that?

[Wikunia]

myvideo = Video(500, 500)
Background(1:70, ground)
red_ball = Object(1:70, (args...) -> object(O, "red"), Point(100,0))
blue_ball = Object(1:70, (args...) -> object(O, "blue"), Point(200,80))
# you can add all `act!`s here

render(
    myvideo;
    liveview=true
)

Sorry I think we confuse each other. The last line should always call render either to a file with pathname or with liveview=true to get a live viewer.

[adeil]

I refer to this step in the tutorial.

How do I make the animation appear on my screen?

[Wikunia]

As it says: The render function stays the same for the rest of this tutorial. So you still need that.

myvideo = Video(500, 500)
Background(1:70, ground)
red_ball = Object(1:70, (args...) -> object(O, "red"), Point(100,0))
act!(red_ball, Action(anim_rotate_around(2\pi, 0)))

render(
    myvideo;
    liveview=true
)

[adeil]

I think there’s something wrong with software. I had already done this, but a static image of the red ball appears.

julia> act!(red_ball, Action(anim_rotate_around(2π,O)))
1-element Array{Javis.AbstractAction,1}:
 Action(Javis.Frames{Symbol}(nothing, :same), Animations.Animation{Float64}(Animations.Keyframe{Float64}[Animations.Keyframe{Float64}(0.0, 0.0), Animations.Keyframe{Float64}(1.0, 6.283185307179586)], Animations.Easing{Animations.FuncEasing}[Animations.Easing{Animations.FuncEasing}(Animations.FuncEasing(Animations.f_linear, ()), 1, false, 0.0, 0.0)]), Javis.var"#52#53"{Point}(Point(0.0, 0.0)), nothing, true, Dict{Symbol,Any}())

julia> render(
           myvideo;
           liveview=true
       )
"Live preview started."

[Wikunia]

Have you moved the slider?

[adeil]

I hadn’t done that. Now I’ve seen it. I am a high school physics teacher in Brazil. I’m migrating from python (Vpython) to Julia and I think Javis.jl is a great option. I’m migrating from python (Vpython) to Julia and I think Javis.jl is a great option. Costumo do simulations like this with my students Queda_livre_simples.
When we return to face-to-face classes I intend to teach Julia to my students.

[Wikunia]

Glad I was able to help you out. Currently everything is completely 2D in Javis. Hope that isn’t a problem

[adeil]

Thank you so much for your help. One detail, the program is running on Jupyter. With regard to being in 2D, there’s no problem with that.