Javis get_position doesn't work

General Usage
1

if i type:

triangle = Object( JPoly(ngon(vertices_square[1], 10, 3, -π / 2, vertices = true); action = :fill, color = "black")))

and use this object inside some functions, ill get this error:( using pos(triangle) )

ERROR: MethodError: no method matching get_position(::Vector{Point})
Closest candidates are:
get_position(::Javis.Layer) at C:\Users\lol.julia\packages\Javis\UaLm7\src\layers.jl:187
get_position(::Point) at C:\Users\lol.julia\packages\Javis\UaLm7\src\object_values.jl:17
get_position(::Transformation) at C:\Users\lol.julia\packages\Javis\UaLm7\src\object_values.jl:18
…
Stacktrace:
[1] get_position(obj::Object)
@ Javis C:\Users\lol.julia\packages\Javis\UaLm7\src\object_values.jl:32

Insted if i use:

JCircle(vertices_square[1], 3; action = :fill, color = "black")

all my program works fine.
how can i fix this?

2

the workaround i can suggest for now is to explicitly declare an object calling poly in the object function instead of using the shorthand

triangle = Object ( frames , (args...) -> begin
                                              sethue("black")
                                              poly(ngon(vertices_...) , :fill)
                                              O
                                          end )
1 Like
3

thx for the reply
i have another type of error now:

ERROR: MethodError: no method matching (::var"#17#18")(::Video, ::Object, ::Int64; center=Point(-199.91949180758272, -199.00324605295305))
Closest candidates are:
(::var"#17#18")(::Any…) at c:\Users\lol\Desktop\julia_esercizi\testants\graph.jl:181 got unsupported keyword argument “center”
Stacktrace:
[1] draw_object(object::Object, video::Video, frame::Int64, origin_matrix::Matrix{Float64}, layer_frames::Nothing)
@ Javis C:\Users\lol.julia\packages\Javis\UaLm7\src\Javis.jl:666

its’ because i am using

obj.change_keywords[:center] = new_point

to change the positions of objects without using transition.
it seems that i must use another keyword for the dictionary change_keywords when i declare explicitly the object

4

can you post the code here ?

5

this is an example of using change_keywords
i use it in the same way, here too if you change the code and declare explicitly the obj you will have the same error

6

the shorthands construct an anonymous function for you , take a look at JCircle.jl in the source ,
it returns an anonymous function which has the signature (args...; center , radius , color , linewidth ,action ) so in that example the obj.func has a kwarg center.

If you want to declare explicitly and not use shorthands you have to ensure that the function passed inside Object has a kwarg center (it should be a kwarg , not a usual arg)

similarly in your example , the function used for drawing should have a kwarg called center

1 Like
7

Fantastic! i read carefully JCircle.jl and tried to do the same thing with my anonymous function.
the solution is this:

Object(1:nframes,(args...;center =Point(10,30) -> begin
    obj_coordinate = center

    radius = 5
    ....

return obj_coordinate
                                              end ))

should i make your comment as the solution or mine? i m still learning on how to help the comunity

8

you can mark whichever , upto you :sweat_smile:,

Also I’m not sure on the etiquette on having a follow up question in the comments or as a separate
post altogether .

Also maybe change the code to be in a code block , (looks nicer that way :sweat_smile: )

1 Like