# Makie: Animation via Node() works with text(), but not with scatter()
**URL:** https://discourse.julialang.org/t/makie-animation-via-node-works-with-text-but-not-with-scatter/28100
**Category:** Visualization
**Tags:** makie
**Created:** [August 28, 2019, 12:03pm UTC](https://discourse.julialang.org/t/makie-animation-via-node-works-with-text-but-not-with-scatter/28100 "2019-08-28T12:03:52Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@Arjen\_Suijker](https://discourse.julialang.org/u/Arjen_Suijker)
#### Post date: [August 28, 2019, 12:03pm UTC](https://discourse.julialang.org/t/makie-animation-via-node-works-with-text-but-not-with-scatter/28100/1 "2019-08-28T12:03:52Z")
I have been struggling with this for days, I don’t know if this is a bug or if I’m just missing something.
I want to animate both text and and scatters based on real-time input. I’m using Node for this (Observables). This works fine for text, but not for scatter (or lines). I hope my code is understandable:
```julia
module Animate
export doAnimate
using Makie
scene = Scene(resolution = (500,500))
attrs = String[]
posX = []
posY = []
function doAnimate(woord,fitness)
newPosX = rand(1:200)
newPosY = rand(1:200)
global attrs
global posX
global posY
cur = 0
for i = 1:length(attrs)
if(attrs[i] == woord)
cur = i
end
end
if (cur>0)
oldPosX = posX[cur][]
oldPosY = posY[cur][]
xStep = (newPosX - oldPosX) / 30
yStep = (newPosY - oldPosY) / 30
for i = 1:30
push!(posX[cur], oldPosX + xStep * i)
push!(posY[cur], oldPosY + yStep * i)
sleep(1/30)
display(scene)
end
else
push!(posX, Node(0.0))
push!(posY, Node(0.0))
s = scatter!([posX[end]], [posX[end]], color = :blue)
t = text!(scene, "fgdsg", position = (posX[end], posY[end]))
push!(attrs, woord)
end
return
end
end
```
The problem lies with the following line:
```julia
s = scatter!([posX[end]], [posX[end]], color = :blue)
```
It gives me the following error:
```julia
ERROR: LoadError: MethodError: no method matching push!(::Annotations{...}, ::Array{String,1}, ::Tuple{Int64,Float64}; rotation=0.0, textsize=0.059999995f0, align=(:center, :top), color=:black, font="Dejavu Sans")
```
Anyone understands what’s going on?
---
### Author:  [@sdanisch](https://discourse.julialang.org/u/sdanisch)
#### Post date: [August 29, 2019, 8:30am UTC](https://discourse.julialang.org/t/makie-animation-via-node-works-with-text-but-not-with-scatter/28100/2 "2019-08-29T08:30:49Z")
If you need `display` in your animation loop, you’re doing something wrong 😉
I’m not sure I understand your code… Can you make a runnable example?
Best without module & function definition and as simple as possible!
---
### Author:  [@Arjen\_Suijker](https://discourse.julialang.org/u/Arjen_Suijker)
#### Post date: [August 30, 2019, 2:25pm UTC](https://discourse.julialang.org/t/makie-animation-via-node-works-with-text-but-not-with-scatter/28100/3 "2019-08-30T14:25:43Z")
Thank you for your quick reply. I’m afraid that stripping it down further will obfuscate the problem. However, I have made it so that it runs as is:
```julia
using Makie
using Random
scene = Scene(resolution = (500,500))
attrs = String[]
posX = []
posY = []
function doAnimate(woord,fitness)
newPosX = rand(1:200)
newPosY = rand(1:200)
global attrs
global posX
global posY
cur = 0
for i = 1:length(attrs)
if(attrs[i] == woord)
cur = i
end
end
if (cur>0)
oldPosX = posX[cur][]
oldPosY = posY[cur][]
xStep = (newPosX - oldPosX) / 30
yStep = (newPosY - oldPosY) / 30
for i = 1:30
push!(posX[cur], oldPosX + xStep * i)
push!(posY[cur], oldPosY + yStep * i)
sleep(1/30)
display(scene)
end
else
push!(posX, Node(0.0))
push!(posY, Node(0.0))
println(woord)
#s = scatter!([posX[end]], [posX[end]], color = :blue)
t = text!(scene, "fgdsg", position = (posX[end], posY[end]))
push!(attrs, woord)
end
return
end
for i = 1:20
doAnimate(string(rand(1:5)),0)
sleep(1)
end
```
If you uncomment the commented line, you’ll get an error that I really don’t understand. I expect there to appear scatters moving around the scene just like the text.
---
### Author:  [@sdanisch](https://discourse.julialang.org/u/sdanisch)
#### Post date: [September 1, 2019, 12:30pm UTC](https://discourse.julialang.org/t/makie-animation-via-node-works-with-text-but-not-with-scatter/28100/4 "2019-09-01T12:30:39Z")
There are a lot of things I’d do differently… This should work:
```julia
using Makie
using Random
scene = Scene(resolution = (500,500), limits = FRect3D(Vec3f0(0), Vec3f0(150, 150, 0)))
words = Node(String[" "]) # Empty array of string doesn't work :( ... Need a better way for this!
positions = Node(Point2f0[Point2f0(0)])
function doAnimate(word, fitness)
newpos = rand(Point2f0) .+ 1.0 .* 100
cur = findfirst(isequal(word), words[])
if cur !== nothing
oldpos = positions[][cur]
step = (newpos .- oldpos) ./ 30
for i = 1:30
isopen(scene) || break
positions[][cur] = oldpos .+ step .* i
positions[] = positions[]
# update!(scene)
sleep(1/30)
end
else
println(word)
push!(positions[], Point2f0(0.0))
push!(words[], word)
positions[] = positions[]
words[] = words[]
# update!(scene)
end
return
end
scatter!(positions, color = :blue, markersize = 5)
annotations!(words, positions)
display(scene)
for i = 1:20
isopen(scene) || break
doAnimate(string(rand(1:5)), 0)
sleep(1)
end
```
---
### Author:  [@Arjen\_Suijker](https://discourse.julialang.org/u/Arjen_Suijker)
#### Post date: [September 2, 2019, 10:56am UTC](https://discourse.julialang.org/t/makie-animation-via-node-works-with-text-but-not-with-scatter/28100/5 "2019-09-02T10:56:09Z")
Wow, thanks for taking the time! I made it work with your method. I come from a sloppy JavaScript background, so getting used to Julia is quite hard.
Could you explain why in my version lines() worked while scatter() didn’t?
---
### Author:  [@sdanisch](https://discourse.julialang.org/u/sdanisch)
#### Post date: [September 2, 2019, 12:21pm UTC](https://discourse.julialang.org/t/makie-animation-via-node-works-with-text-but-not-with-scatter/28100/6 "2019-09-02T12:21:16Z")
I didn’t look too closely, but I think you created something like: `[Node(number)]`, which doesn’t work… You need to supply an array, or `Node(array)`, but not `Array(node)`
---
### Author:  [@nantonel](https://discourse.julialang.org/u/nantonel)
#### Post date: [October 14, 2021, 11:21am UTC](https://discourse.julialang.org/t/makie-animation-via-node-works-with-text-but-not-with-scatter/28100/7 "2021-10-14T11:21:29Z")
I’m posting here since the topic name is the same.
I’d like to update a matrix using `Node`. Although I manage to update text, I cannot see to update the matrix. Here is a MWE, similar to the [Appending data with Observables](https://makie.juliaplots.org/stable/documentation/animation/index.html#appending_data_with_observables)
```julia
using GLMakie
A = Node(ones(30,30))
time = Node(1)
fig, ax = heatmap(A,
axis = (title = @lift("t = $(round($time, digits = 1))"),)
)
frames = 1:30
record(fig, "append_animation.mp4", frames;
framerate = 30) do t
time[] = t
A[][t,t] += t
end
```
---
### Author:  [@sdanisch](https://discourse.julialang.org/u/sdanisch)
#### Post date: [October 14, 2021, 11:48am UTC](https://discourse.julialang.org/t/makie-animation-via-node-works-with-text-but-not-with-scatter/28100/8 "2021-10-14T11:48:01Z")
> I’m posting here since the topic name is the same.
One should usually just open a new topic 😉
```julia
A[][t,t] += t
```
You’re not updating the Node, instead you update the matrix in-place…
To make this work you need to call:
```julia
notify(A)
```
With GLMakie, you can also try the `Sampler` type, which allows to really just upload the indices you change to the gpu:
>
It’s not well tested, and may only work with image though… If it doesn’t work like intended with Heatmap, feel free to open an issue:
> **[Build software better, together](https://github.com/MakieOrg/Makie.jl/issues/new)**
>
> GitHub is where people build software. More than 100 million people use GitHub to discover, fork, and contribute to over 420 million projects.
---
### Author:  [@nantonel](https://discourse.julialang.org/u/nantonel)
#### Post date: [October 14, 2021, 12:39pm UTC](https://discourse.julialang.org/t/makie-animation-via-node-works-with-text-but-not-with-scatter/28100/9 "2021-10-14T12:39:24Z")
This works perfectly:
> [@sdanisch](#):
>
> `notify(A)`
Thank you! Haven’t tried `Sampler`, no GPU at the moment 😃