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explores how browser-based computational notebooks — significantly the WLJS Pocket book — can remodel static slides into dynamic, real-time experiences. This strategy isn’t restricted to displays; you possibly can put together interactive lecture notes for college kids or colleagues and publish it on net. For knowledge scientists, physicists, it highlights new methods to speak fashions, simulations, and visualizations, making complicated concepts extra intuitive and fascinating.
Is a PDF Sufficient?
Animations, bells and whistles, particularly the type that have been standard in PowerPoint 15–20 years in the past, have largely taken a backseat. Add to this the compatibility points between LibreOffice and MS Workplace (even between variations for Home windows and Mac), the presence or absence of crucial fonts — and the need to do one thing uncommon on the “stage” fades away rapidly.
Take a look at trendy technical displays: very often, it’s only a PDF doc consisting of pages with vector and raster graphics, and generally GIF animations that eat up megabytes (like this submit), with no mercy.
Unused Potential
It’s value separating ornamental bells and whistles from those who carry further data in some media format. For instance, check out ECMA-363 [1] specification.
A 3D mannequin inside a PDF doc merely enhances the consumer/viewer expertise. You observe the thing from completely different angles/cross-sections.
It’s disappointing that such a function is sort of nowhere supported aside from Adobe Acrobat and certain is not going to be. It appears like we made a leap previously, however now we have now returned to static slides.
Massive Scientific Convention DPG
DPG-Frühjahrstagung is a big European physics convention organized by the German Bodily Society (DPG) [2]. Yearly, they collect greater than 10^4 scientists and happen in German cities, protecting an unlimited array of physics fields.
There are such a lot of displays, and it lasts nearly every week, so by the top, it turns into too overwhelming. However, this doesn’t diminish its worth as a platform for networking, training displays, and a dependable technique to study what’s at present available on the market, which trains have gone already, and that are simply departing.
The individuals in plenary classes are largely Grasp’s college students and PhD college students, with postdocs being rarer.
Such a big and accessible platform is a wonderful motivation to attempt one thing new 💡 even when one thing might go fallacious.
What’s a JoyCon?
Absolutely, the reader has seen units like this:
This system acts as a slide switcher and generally as a laser pointer, connecting through Bluetooth or via a dongle. In any case, it’s a sort of controller with buttons. Controllers might be extra attention-grabbing — just like the one from the 2017 Nintendo Change handheld console
It’s not a lot larger, however it has some further cool options:
- Analog stick 🕹️
- 11 buttons ☎️
- IR digicam 📸 (tough to make use of, no good API documentation)
- Full IMU 🌐 (Inertial Measurement Unit) aka gyroscope with an accelerometer
- Bluetooth connectivity; acknowledged as a daily HID
The buttons can certainly be mapped to PowerPoint, or the stick can be utilized to regulate slides, emulating mouse or keyboard clicks, because it was carried out in these tasks:
I believed it could be cool to by some means use the IMU and analog stick. However for that, one would wish to transcend PowerPoint and PDF 🧙🏼♂️
Transferring Slides to Browser Setting
The concept behind this isn’t new, however it’s essential to keep in mind that this strategy might not work for everybody. Nevertheless, by shifting the presentation show and creation to the browser (significantly Javascript and HTML lands), we mechanically acquire entry to all the probabilities of contemporary net know-how: peripheral system assist, JavaScript, CSS animation magic, and rather more, together with video. It’s essential to notice that each one of that is cross-platform by default and can work nearly in all places.
For instance, slides might be created in Markdown (or/and HTML) with the assistance of a easy framework (moderately, a small library) RevealJS [5]
There’s additionally MDX-based presentation engines, and issues like Manim [6], Movement Canvas [7], however these guys require much more expertise to grasp.
The RevealJS API is kind of easy, so controlling the slides through JavaScript instructions is straightforward to implement:
setTimeout(() =>{
Reveal.navigateNext(1);
}, 1000)Nevertheless, this direct strategy has important drawbacks. It requires an web connection, and should you’d desire to keep away from it, you’ll want to make use of bundlers (akin to Rollup) and embed all JavaScript libraries right into a single HTML file, as an illustration. Alternatively, you can run an area net server.
Possibility with Jupyter Pocket book
If you happen to like Python and IPYNB, then use nbconvert — it is going to convert your pocket book straight right into a RevealJS presentation, and also you gained’t even discover it! Or use the extension for Jupyter—RISE [8]
In any case, the thought stays easy — we have to by some means enter the online browser setting to benefit from all the probabilities of JoyCon.
Strive it on Binder!
Possibility with WLJS Pocket book
My opinion on WLJS [9] could be considerably biased as I’m certainly one of its builders (and lively customers). This open-source IDE with a pocket book interface is extra tightly built-in with the online setting, as slides should not exported there however are as an alternative executed and are simply one other sort of output cell, alongside the acquainted Markdown.
Underneath the hood, it additionally makes use of RevealJS however with just a few additional options:
- It really works offline
- It permits embedding interactive parts and parts, just like LaTeX Beamer
- It’s built-in with Wolfram Language (freeware distribution)
See extra about it in this story [10]. An final information on find out how to make presentation there we printed in our official weblog: Dynamic Presentation, or Find out how to Code a Slide with Markdown and WL [11].
Let’s Dive into JoyCon
So, the best possibility is to make use of the already ready-made library joy-con-webhid [12]. Why spend time reinventing the wheel when folks have already executed a fantastic job for us?
npm set up joy-con-webhid --prefix .All subsequent examples can be taken from the WLJS Pocket book. Nevertheless, you are able to do just about the identical factor utilizing Python + FAST API to interface with JavaScript or one thing related, and even simply use JS alone. The web model of the pocket book is on the market right here [13].
First, let’s take heed to what’s coming from the controller port.
Code
.esm
import { connectJoyCon, connectedJoyCons } from 'joy-con-webhid';
// Create join button
const connectButton = doc.createElement('button');
connectButton.className = 'relative cursor-pointer rounded-md h-6 pl-3 pr-2 text-left text-gray-500 focus:outline-none ring-1 sm:text-xs sm:leading-6 bg-gray-100';
connectButton.innerText = "Join";
let connectionState = "Join";
let isJoyConConnected = false;
let lastUpdateTime = efficiency.now();
let isAllowedToConnect = false;
// principal handler perform (warning! known as at 60FPS)
perform handleJoyConInput(element) {
const currentTime = efficiency.now();
if (currentTime - lastUpdateTime > 50) { // decelerate
lastUpdateTime = currentTime;
console.log(element);
}
}
// JoyCon periodically goes to sleep, we have to wake it up
const connectionCheckInterval = setInterval(async () => {
if (!isAllowedToConnect) return;
const connectedDevices = connectedJoyCons.values();
isJoyConConnected = false;
for (const joyCon of connectedDevices) {
isJoyConConnected = true;
if (joyCon.eventListenerAttached) proceed;
await joyCon.open();
await joyCon.enableStandardFullMode();
await joyCon.enableIMUMode();
await joyCon.enableVibration();
await joyCon.rumble(600, 600, 0.5);
joyCon.addEventListener('hidinput', ({ element }) => handleJoyConInput(element));
joyCon.eventListenerAttached = true;
}
updateConnectionState();
}, 2000);
// Replace button state
perform updateConnectionState() {
if (isJoyConConnected && connectionState !== "Related") {
connectionState = "Related";
connectButton.innerText = connectionState;
connectButton.type.background = '#d8ffd8';
} else if (!isJoyConConnected && connectionState !== "Join") {
connectionState = "Join";
connectButton.innerText = connectionState;
connectButton.type.background = '';
}
}
// Deal with click on occasion
connectButton.addEventListener('click on', async () => {
isAllowedToConnect = true;
if (!isJoyConConnected) {
await connectJoyCon();
}
});
// Simply decorations
const container = doc.createElement('div');
container.innerHTML = `Presenter controller`;
container.appendChild(connectButton);
container.className = 'flex flex-col gap-y-2 bg-white rounded-md shadow-md';
// Return DOM ingredient to the web page
this.return(container);
// When a cell bought eliminated
this.ondestroy(() => {
cancelInterval(connectionCheckInterval);
});A very powerful perform right here is:
perform handleJoyConInput(element) {
const currentTime = efficiency.now();
if (currentTime - lastUpdateTime > 50) { // decelerate
lastUpdateTime = currentTime;
console.log(element); //output to the console
}
}It appears like there are lots of steps to do. In actuality, most of this code offers with connecting the controller and drawing a big “Join” button. Don’t pay an excessive amount of consideration to the particular strategies — they’ll simply get replaced with these obtainable in your particular setting:
this.return(dom)passes aDOMElementfor embedding on the web pagethis.ondestroy(perform)callsperformwhen the cell is deleted, to scrub up timers, and many others.- The primary line
.esmis a technique to specify the JavaScript cell subtype in WLJS Pocket book, which requires pre-bundling.
After we run this code cell, we are going to see the next:
Then comply with these steps:
- Disconnect the controller from the Nintendo Change (System → Controllers → Disconnect).
- Pair the JoyCon (R) with the PC by holding the small button on the facet.
- Press “Join” on our presenter controller.
Opening the browser console, we reveal the next messages:
{
"buttonStatus": {
"y": false,
"x": false,
"b": false,
"a": false,
"r": false,
"zr": false,
"sr": false,
"sl": false,
"plus": false,
"rightStick": false,
"house": false,
},
"analogStickRight": {
"horizontal": "0.1",
"vertical": "0.3"
},
"actualAccelerometer": {
"x": 0,
"y": 0,
"z": 0
},
"actualGyroscope": {
"dps": {
"x": 0,
"y": 0,
"z": 0
},
"rps": {
"x": 0,
"y": 0,
"z": 0
}
}
}Various knowledge! Let’s attempt utilizing this for the good thing about our presentation 💡
Buttons ☎️
To start, we are able to use two buttons to change slides
Within the WLJS pocket book, slides may also be managed programmatically via a Wolfram wrapper perform that calls the RevealJS API.
FrontSlidesSelected["navigateNext", 1] // FrontSubmitAll that’s left is to set off this perform on the proper second when the button (or swap) is clicked. To do that, occasions must be despatched from the Javascript world to the Wolfram machine, the place we are able to then do no matter we wish with them. This ends in the next diagram:
You don’t have to consider this, since it’s seamlessly carried out through APIs
Let’s return to the code cell and modify the handler.
Code
//....
//.......
const buttonStates = { //all buttons states on JoyCon (R)
a: false, b: false, house: false, plus: false, r: false, sl: false, sr: false,
x: false, y: false, zr: false
};
const joystickPosition = [0.0, 0.0];
let restingJoystick = [0.0, 0.0];
let isCalibrated = false;
perform handleJoyConInput(element) {
if (!isCalibrated) { //calibration
restingJoystick = [Number(detail.analogStickRight.horizontal), Number(detail.analogStickRight.vertical)];
isCalibrated = true;
return;
}
const currentTime = efficiency.now();
if (currentTime - lastUpdateTime > 50) {
lastUpdateTime = currentTime;
let buttonPressed = false;
let joystickMoved = false;
for (const key of Object.keys(buttonStates)) {
if (!buttonStates[key] && element.buttonStatus[key]) buttonPressed = true;
buttonStates[key] = element.buttonStatus[key];
}
const verticalOffset = Quantity(element.analogStickRight.vertical) - restingJoystick[1];
const horizontalOffset = Quantity(element.analogStickRight.horizontal) - restingJoystick[0];
if (Math.abs(verticalOffset) > 0.1 || Math.abs(horizontalOffset) > 0.1) {
joystickMoved = true;
}
joystickPosition[0] = horizontalOffset;
joystickPosition[1] = -verticalOffset;
if (buttonPressed) {
for (const key of Object.keys(buttonStates)) {
if (buttonStates[key]) {
server.kernel.io.hearth('JoyCon', true, key);
break;
}
}
}
if (joystickMoved) {
server.kernel.io.hearth('JoyCon', joystickPosition, 'Stick');
}
}
}
//.......
//..As you possibly can see, we have now added a number of objects right here:
- Joystick calibration — analog sticks drift, so their digital place is rarely good
0.,0.. - State of all buttons — why hammer the door each time should you solely want to softly knock when the state modifications? This reduces system stress.
- Sending states to the occasion pool — that is particular to WLJS, the place we ship knowledge to the Wolfram machine (or Python should you’re in Jupyter).
The final level appears like this (change with the equal in your setting):
server.kernel.io.hearth(String identify, Object state, String sample);Then, on the Wolfram facet, we are able to simply subscribe to those occasions like this
EventHandler["name", {
"pattern" -> Function[state,
Print[state];
]
}]That is very handy, as Javascript sends the names of the pressed buttons because the sample. On this case, you possibly can instantly subscribe to slip switching, for instance, like this:
- ZR — subsequent slide
- Y — again
Thus, programmatically controlling slides turns into intuitive:
EventHandler["JoyCon", {
"zr" -> (FrontSubmit[FrontSlidesSelected["navigateNext", 1]]&),
"y" -> (FrontSubmit[FrontSlidesSelected["navigatePrev", 1]]&)
}];Let’s Check in Observe
Let’s create a easy presentation. Begin typing with
.slide
# Slide 1
__Hey Medium!__
---
Now, let’s join the JoyCon to the PC and hyperlink it to our Javascript script by urgent the Join button. Then, subscribe to the occasions as soon as within the lively session.
Now, simply run the cell with the slides:
Analog Stick 🕹️
The stick theoretically permits controlling two sliders concurrently. For the DPG Spring Conferences, I had the thought of a reside demonstration of a really peculiar impact m𝒶𝑔𝒾c𝑎𝓁 𝓌𝑜𝓇𝒹𝓈 𝒻𝓇𝑜𝓂 𝓅𝒽𝓎𝓈𝒾𝒸𝓈. I consider that some ideas are rather more impactful and understandable when demonstrated reside on stage.
Here’s a condensed code snippet for the interactive widget:
FaradayWidget := ManipulatePlot[
Abs[(E^(I w (-1 + Sqrt[1 + (f/((-I g - w) w + (d - w0)^2))])) + E^(I w (-1 + Sqrt[1 + (f/((-I g - w) w + (d + w0)^2))]))) /. {g -> 0.694, w0 -> 50.0}]
, {w, 20, 80}, {{f,2},0,100,1}, {{d,0},0,10,1}
, FrameLabel->{"wavenumber", "transmission"}
, Body->True
];
FaradayWidgetThe interactive on-line model of this widget is on the market right here [14]
To embed it in a slide, insert its image as a tag (just like JSX):
.slide
# Faraday Widget
Right here it's in motion
Now, let’s hyperlink it to our stick
To start with, let’s carry out a easy check and bind its place to a disk on the display screen:
pos = {0.,0.};
EventHandler["JoyCon", {"Stick" -> ((pos = #)&)}];
Graphics[{
Circle[{0,0}, 2.],
Disk[pos // Offload, 0.1]
}]
Clearly, the actions are too abrupt. Furthermore, making small changes is kinda painful utilizing JoyCon. The answer? Integration!
EventHandler["JoyCon", {"Stick" -> ((pos += 0.1 #)&)}];
Now, let’s hyperlink the pos variable to the sliders of our widget:
FaradayWidget := ManipulatePlot[
Abs[(E^(I w (-1 + Sqrt[1 + (f/((-I g - w) w + (d - w0)^2))])) + E^(I w (-1 + Sqrt[1 + (f/((-I g - w) w + (d + w0)^2))]))) /. {g -> 0.694, w0 -> 50.0}]
, {w, 20, 80}, {{f,2},0,100,1}, {{d,0},0,10,1}
, FrameLabel->{"wavenumber", "transmission"}
, Body->True
, "TrackedExpression" -> Offload[5 pos] (* <-- *)
];Right here’s the way it appears reside on a slide:
And within the precise DPG presentation:
A Second of Relaxation
Final yr, DPG came about in Berlin, and this yr — in Regensburg, which has about 23 occasions fewer inhabitants and is 10 occasions smaller in space. Nevertheless, the comfortable lands of Bavaria have all the time been nearer to my ❤️
And that is the college. A stable 60s-style constructing. Wha 💪🏻
A brand new invention — a cup “Drink and Eat Me”
As a bonus, each drink will get a touch of waffle taste! However, be careful — don’t chunk into it whereas it’s stuffed with scorching tea.
I couldn’t take extra photographs since I bought sick on the primary day and went again house to Augsburg. On the whole, spending six days at a convention is kind of difficult.
Again to enterprise 🐏
IMU or Gyroscope-Accelerometer Mixture 🌐
To make use of them, we have to learn the corresponding fields from the particulars object, particularly:
- actualAccelerometer: x, y, z
- actualGyroscope: rps (radians per second)
Code
//..
//....
const buttonStates = {
a: false, b: false, house: false, plus: false, r: false, sl: false, sr: false,
x: false, y: false, zr: false
};
const joystickPosition = [0.0, 0.0];
let restingJoystick = [0.0, 0.0];
let isCalibrated = false;
let imuEnabled = false;
// Allow IMU mode if allowed
core.JoyConIMU = async (args, env) => {
imuEnabled = await interpretate(args[0], env);
};
// Operate to deal with Pleasure-Con enter
perform handleJoyConInput(element) {
if (!isCalibrated) {
restingJoystick = [Number(detail.analogStickRight.horizontal), Number(detail.analogStickRight.vertical)];
isCalibrated = true;
return;
}
const currentTime = efficiency.now();
if (currentTime - lastUpdateTime > 50) { // Replace each 50ms
lastUpdateTime = currentTime;
let buttonPressed = false;
let joystickMoved = false;
for (const key of Object.keys(buttonStates)) {
if (!buttonStates[key] && element.buttonStatus[key]) buttonPressed = true;
buttonStates[key] = element.buttonStatus[key];
}
const verticalOffset = Quantity(element.analogStickRight.vertical) - restingJoystick[1];
const horizontalOffset = Quantity(element.analogStickRight.horizontal) - restingJoystick[0];
if (Math.abs(verticalOffset) > 0.1 || Math.abs(horizontalOffset) > 0.1) {
joystickMoved = true;
}
joystickPosition[0] = horizontalOffset;
joystickPosition[1] = -verticalOffset;
if (imuEnabled) {
server.kernel.io.hearth('JoyCon', {
'Accelerometer': Object.values(element.actualAccelerometer),
'Gyroscope': Object.values(element.actualGyroscope.dps)
}, 'IMU');
}
if (buttonPressed) {
for (const key of Object.keys(buttonStates)) {
if (buttonStates[key]) {
server.kernel.io.hearth('JoyCon', true, key);
break;
}
}
}
if (joystickMoved) {
server.kernel.io.hearth('JoyCon', joystickPosition, 'Stick');
}
}
}
//....
//..Since IMU shouldn’t be all the time wanted, the script features a boolean variable and a management perform JoyConIMU[True | False], permitting IMU measurements to be enabled or disabled.
The JoyCon, like most different units with IMU (some smartphones, watches, however undoubtedly not VR headsets or quadcopters), contains:
- 3-axis gyroscope — returns angular velocity in rad/sec round all three axes
- 3-axis accelerometer — returns a single acceleration vector
Query: Why can’t we use solely a gyroscope or an accelerometer?
Let’s attempt outputting each. First, allow IMU utilization:
JoyConIMU[True] // FrontSubmit;Now, outline auxiliary capabilities and variables:
prevTime = AbsoluteTime[];
angles = {0,0,0};
acceleration = {0,0,-1};
course of[imu_] := With[{time = AbsoluteTime[]},
With[{dt = time - prevTime},
angles = (angles + {-1,1,1} imu["Gyroscope"][[{3,1,2}]] dt);
acceleration = imu["Accelerometer"];
prevTime = time;
]
]What occurs right here:
- The accelerometer vector is just saved in
acceleration. - Gyroscope knowledge is processed by:
- Reordering angular velocity values (JoyCon {hardware} orientation) and adjusting instructions.
- Integrating over time to acquire orientation angles
In consequence, we receive:
- Three angles defining JoyCon orientation
angles. - One acceleration vector (at relaxation — the gravity route)
acceleration.
These three angles are conveniently expressed as a matrix (tensor):
RollPitchYawMatrix[{[Alpha], [Beta], [Gamma]}] // MatrixFormMaking use of this matrix to any 3D object permits it to be oriented in accordance with these angles. Bodily, on the JoyCon, it appears like this:
You will need to observe that since we measure solely the primary spinoff (utilizing Gyro), then the preliminary IMU orientation stays unknown. Due to this fact, we manually set the preliminary state, i.e.
angles = {0., 0., 0}
EventHandler["JoyCon", {
"IMU" -> Function[val,
process[val];
]
}];
angles = {0,0,0}; (* calibration *)
Refresh[acceleration, 0.25] (* dynamically replace *)
Refresh[angles, 0.25] (* dynamically replace *)Actual-time Information Output:
Nicely… Not fairly apparent what these values imply. Let’s attempt to attract then as vectors in 3D house:
axis = Desk[{{0.,0.,0.}, Table[1.0 KroneckerDelta[i, j], {i,3}]}, {j,3}];
EventHandler["JoyCon", {
"IMU" -> Function[val,
process[val];
axis[[1]] = {{0.,0.,0.}, RollPitchYawMatrix[angles].{0,1.0,0.0}};
axis[[2]] = {{0.,0.,0.}, RollPitchYawMatrix[angles].{-1.0,0.0,0}};
axis[[3]] = {{0.,0.,0.}, -Normalize[acceleration][[{2,1,3}]]};
axis = axis;
]
}];After which render them as coloured cones, the place:
- Blue and pink — defines angles derived from the gyroscope knowledge
- Inexperienced — accelerometer knowledge (inverted and normalized)
{
{Opacity[0.2], Sphere[]},
Crimson, Tube[axis[[1]]//Offload, {0.2, 0.01}],
Blue, Tube[axis[[2]]//Offload, {0.2, 0.01}],
Inexperienced, Tube[axis[[3]]//Offload, {0.2, 0.01}]
} // Graphics3D
EventHandler[InputButton["Reset"], Operate[Null, angles *= .0]]
The inexperienced vector is all the time aligned “accurately,” whereas the blue and pink vectors, representing gyroscope angles, accumulate errors over time, particularly with speedy actions, inflicting drift.
There are numerous methods to unravel this difficulty. The overall concept is to regulate the angles utilizing accelerometer knowledge (inexperienced vector), because the accelerometer exactly determines the downward route ( till an exterior power disturbs it).
For a extra detailed clarification, take a look at a fantastic video by James Lambert [15], which explores these issues and their options, together with a detailed instance with Oculus DK1.
Why the heck do we’d like this within the presentation?
I requested myself this query once I found how deep the rabbit gap goes. In my discuss on the magnetism session, there was precisely one slide the place the thought of an IMU made any sense:
Do you see the crystalline construction? Discovering a “good” digicam angle for it’s certainly tough, so why not rotate it straight, energetic? We don’t want all three angles and acceleration-just one will suffice.
Thus, we discard the accelerometer and preserve solely the gyroscope:
FrontSubmit[JoyConIMU[True]];
timestamp = AbsoluteTime[];
angle = 0.;
rotation = RotationMatrix[angle, {0,0,1.0}];
EventHandler["JoyCon", {
"IMU" -> Function[val,
With[{angularSpeed = val["Gyroscope"][[1]], time = AbsoluteTime[], oldAngle = angle},
angle += (time - timestamp) angularSpeed;
timestamp = time;
];
rotation = RotationMatrix[angle, {0,0,1.0}];
]
}];Now, we simply want to use the rotation transformation tensor to our 3D construction. Since this crystal comprises many ions, that are additionally coloured, I compressed them into base64
base64 code
CrystalRawStructure = "1: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" // Uncompress ;CrystalStructure = Graphics3D[
GeometricTransformation[CrystalRawStructure, rotation // Offload]
, ViewPoint->3.5{1.0,0.5,0.5}
, ImageSize->{550,600}
]Let’s embed it into our slide:
.slide
# Slide
Right here is my crystal construction!
To make it much more handy, it could be helpful to subscribe to IMU solely when the slide is lively and unsubscribe when leaving it. That is simple to do as a result of RevealJS indicators the core on slide state change occasions. Let’s implement this as a part utilizing .wlx cell sort:
.wlx
InteractiveCrystalStructure := Module[{rotation = RotationMatrix[1Degree, {0,0,1.0}], id = CreateUUID[], timestamp = AbsoluteTime[], angle = 0., CrystalStructure},
CrystalStructure = Graphics3D[
GeometricTransformation[CrystalRawStructure, rotation // Offload]
, ViewPoint->3.5{1.0,0.5,0.5}
, ImageSize->{550,600}
];
EventHandler[id, {
"Slide" -> Function[Null,
FrontSubmit[JoyConIMU[True]];
EventHandler["JoyCon", {
"IMU" -> Function[val,
With[{angularSpeed = val["Gyroscope"][[1]], time = AbsoluteTime[], oldAngle = angle},
angle += (time - timestamp) angularSpeed;
timestamp = time;
];
rotation = RotationMatrix[angle, {0,0,1.0}];
]
}];
],
("Destroy" | "Left") -> Operate[Null,
FrontSubmit[JoyConIMU[False]];
]
}];
]By inserting this code on any slide, we obtain the specified outcome with out polluting the worldwide house or interfering with different occasion handlers. Thus, IMU subscription administration is localized to the particular slide, and when switching slides, we accurately allow and disable knowledge dealing with with out affecting different slides and their processing
.slide
# Earlier than
---
# Slide
Right here is my crystal construction!
---
# After These are precise slides from DPG2025:
Brief video with my DPG2025 slides
Closing Code and Pocket book
The compiled presenter controller cell code is offered beneath the spoiler. If inserted into an empty cell, it is going to produce a useful widget for connecting a JoyCon.
Compressed cells
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analysis is required (don’t run it ;)). Merely conceal the enter cell, leaving solely the output seen via the properties (click on on the top-right nook of the group).
Here’s a pocket book with all examples [13] (a few of which work in a browser as nicely and not using a kernel).
What if utilizing my very own laptop computer shouldn’t be an possibility?
The WLJS Pocket book might be exported to HTML, preserving even some dynamic habits [16]. That is achieved via a fairly subtle algorithm that tracks all occasion chains occurring on the JS and WL sides, making an attempt to approximate them utilizing a easy state machine. The result’s a typical HTML file containing all cells, slides, and the information of those state machines.
Nevertheless, because of the number of values acquired from the IMU, the exporter can not mechanically seize this in a JS state machine. Consequently, rotations and the joystick enter is not going to be preserved. Nonetheless, all the pieces else will perform as anticipated. 🙂
… like a fish wants a bicycle
Please confer with the ultimate sentence of that stunning comics by
Zach Weinersmith.
If not for the pressing must showcase a rotating crystalline construction, this submit wouldn’t exist.
Thanks in your consideration, and to those that learn this far 🧙🏼♂️ 🤍
References
[1] — ECMA-363 Specification, Wikipedia: https://en.wikipedia.org/wiki/Universal_3D
[2] — DPG2025, Homepage: https://www.dpg-physik.de/
[3] — Leo. Proper Pleasure-con Controller as a Distant, Hackster: https://www.hackster.io/leo49/right-joy-con-controller-as-a-presentation-remote-5810e4 (2024)
[4] — Jen Tong, Nintendo Change Pleasure-Con Presentation Distant, Medium: https://medium.com/@mimming/nintendo-switch-joy-con-presentation-remote-5a7e08e7ad11 (2018)
[5] — RevealJS, Homepage: https://revealjs.com/
[6] — Manim, Homepage: https://www.manim.group/
[7] — Movement Canvas, Homepage: https://motioncanvas.io/
[8] — RISE, Github Web page: https://github.com/damianavila/RISE
[9] — WLJS Pocket book, Homepage: https://wljs.io/
[10] — Vasin Ok. Reinventing dynamic and transportable notebooks with Javascript and Wolfram Language, Medium: https://medium.com/@krikus.ms/reinventing-dynamic-and-portable-notebooks-with-javascript-and-wolfram-language-22701d38d651 (2024)
[11] — Vasin Ok. Dynamic Presentation, or Find out how to Code a Slide with Markdown and WL, Weblog submit: https://wljs.io/weblog/2025/03/02/ultimate-ppt (2025)
[12] — Pleasure-Con WebHID, Github Web page: https://github.com/tomayac/joy-con-webhid
[13] — JoyCon Presenter Device, On-line pocket book: https://jerryi.github.io/wljs-demo/PresenterJoyCon.html
[14] — Faraday Impact, On-line pocket book: https://jerryi.github.io/wljs-demo/THzFaraday.html
[15] — James Lambert VR powered by N64, Youtube video: https://www.youtube.com/watch?v=ha3fDU-1wHk
[16] — Dynamic HTML, WLJS Documentation web page: https://wljs.io/frontend/Exporting/Dynamicpercent20HTML/
All hyperlinks offered have been visited on March 2025.
