dont overwrite method in 3b1b example

Project.toml

@@ -1,7 +1,7 @@
 name = "InteractiveDynamics"
 uuid = "ec714cd0-5f51-11eb-0b6e-452e7367ff84"
 repo = "https://github.com/JuliaDynamics/InteractiveDynamics.jl.git"
-version = "0.19.3"
+version = "0.19.4"
 
 
 [deps]

docs/src/billiards.jl

@@ -200,21 +200,18 @@ fig
 # the style of [3Blue1Brown](https://www.3blue1brown.com/).
 # %% #src
 using DynamicalBilliards, InteractiveDynamics, CairoMakie
-
 BLUE = "#7BC3DC"
 BROWN = "#8D6238"
 colors = [BLUE, BROWN]
 ## Overwrite default color of obstacles to white (to fit with black background)
-InteractiveDynamics.obcolor(::Obstacle) = RGBf(1,1,1)
 bd = billiard_stadium(1, 1)
 ps = particlebeam(1.0, 0.6, 0, 200, 0.01)
-
+## Notice that keyword `color = :white` is propagated to billiard plot
 bdplot_video(
     "3b1billiard.mp4", bd, ps;
     frames = 120, colors, dt = 0.01, tail_length = 100,
-    backgroundcolor = :black, framerate = 10,
+    backgroundcolor = :black, framerate = 10, color = :white,
 )
-nothing
 
 # ```@raw html
 # <video width="auto" controls autoplay loop>

src/billiards/defs_animating.jl

@@ -129,9 +129,10 @@ function bdplot_plotting_init!(ax::Axis, bd::Billiard, ps::Vector{<:AbstractPart
         bmap_size = 4,
         α = 0.9,
         bmax = nothing,
+        kwargs...,
     )
 
-    bdplot!(ax, bd)
+    bdplot!(ax, bd; kwargs...)
     N = length(ps)
     cs = if !(colors isa Vector) || length(colors) ≠ N
         InteractiveDynamics.colors_from_map(colors, N, α)

src/billiards/premade_anim_functions.jl

@@ -28,6 +28,7 @@ and `phs, chs` can be used for making custom animations, see below.
 * `velocity_size = 0.05`: Multiplication of particle velocity before plotted as quiver.
 * `bmap_size = 4`: Marker size of boundary map scatter plot.
 * `backgroundcolor, resolution`: Background color and resolution of the created figure.
+* `kwargs...`: Remaining keywords are propagated to the billiard plotting.
 
 ## Custom Animations
 Two helper structures are defined for each particle: