# Makie user defined marker example?
**URL:** https://discourse.julialang.org/t/makie-user-defined-marker-example/24346
**Category:** Visualization
**Created:** [May 18, 2019, 7:18am UTC](https://discourse.julialang.org/t/makie-user-defined-marker-example/24346 "2019-05-18T07:18:43Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@LaurentPlagne](https://discourse.julialang.org/u/LaurentPlagne)
#### Post date: [May 18, 2019, 7:18am UTC](https://discourse.julialang.org/t/makie-user-defined-marker-example/24346/1 "2019-05-18T07:18:43Z")
Hi,
It try to set up an animation for colliding polygons with Makie.
It is OK if a use poly! and pass new polygon coordinates at each time steps but I guess that it would be more efficient If I use scatter! with user defined polygonal markers, and provide translations and rotations at each timesteps…
Any hint ?
---
### Author:  [@sdanisch](https://discourse.julialang.org/u/sdanisch)
#### Post date: [May 19, 2019, 3:43pm UTC](https://discourse.julialang.org/t/makie-user-defined-marker-example/24346/2 "2019-05-19T15:43:57Z")
You can plot multiple polys in one go, and then just update the whole poly array each frame, which should be fairly efficient:
```julia
p1 = decompose(Point2f0, Circle(Point2f0(0), 1f0))
p2 = Point2f0[(0, 0), (0, 1), (1, 1), (1, 0)]
polys = map(1:10) do i
p = (p1, p2)[rand(1:2)]
off = (rand(Point2f0) .* 5)
size = rand()
map(p) do point
off .+ (point .* size)
end
end
poly(polys, scale_plot = false, color = rand(RGBf0, 10))
```
You can also rotate/scale/translate any plot:
```nohighlight
scene = Scene()
poly_plots = map(polys) do poly
poly!(poly, color = rand(RGBf0), scale_plot = false)[end]
end
display(scene)
rotate!(poly_plots[1], 0.5)
translate!(poly_plots[1], 0.0, 0.1, 0.0).
```
The above could be more efficient then updating the whole poly array - depends a bit on how many points you have per poly.
This would be the most efficient, but would require that each polygon you want has a unicode representation:
```nohighlight
vals = rand(10)
positions = rand(Point2f0, 10)
markers = [('◀', '■', '⬣', '⬤')[rand(1:4)] for i in 1:10]
scatter(positions, color = vals, rotations = vals, marker = markers)
```
It’s also a bit unprecise, but I think if you supply markersizes, it should be scalable to the correct size
---
### Author:  [@LaurentPlagne](https://discourse.julialang.org/u/LaurentPlagne)
#### Post date: [May 19, 2019, 4:38pm UTC](https://discourse.julialang.org/t/makie-user-defined-marker-example/24346/3 "2019-05-19T16:38:31Z")
Thanks a lot !
I have to study your snippet. I still have some difficulties with the `do` construct 😉
I already use the scatter form for the circle thus I wonder if I could define my own marker. I understand now that it must have a unicode representation.