my question may be trivial but I was unable to find an answer so far.
I transitioned from Processing based visualizations to js frameworks, working both front-end and with node.
Great for real-time graphics, but still: If I need to generate a video, what other options I have other than screen record?
This is a particular problem if I need something at a resolution bigger than the webpage, or very resource-heavy, so where I could expect some slow down in real-time visualization
With processing, and I guess other similar tools, it was ok if a frame was taking seconds to render, they were later saved as images and recombined.
And the same about the resolution, it was possible to render in a virtual canvas.
Is there any way to do the same with js based tools?
EDIT: I don't use p5.js, is not a question about that. Mostly my workflow is about mapbox, d3, three.js and Vue.
Thanks
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I am working on a web application which is dealing with bigdata visualization. I am using highcharts for visualization of data. I have tried all of the possible methods proposed by highcharts.
Now there is one work around in my mind is to request more memory from system for my web page. But I don't know how is it possible by using javascript in browsers.
please help me to find any best solution.
What I am proposing here is not a full answer but a set of questions, you should ask yourself, before going with this or that solution.
What is the size of the data?
Are we talking about hundreds, thousands or millions data point?
Can you aggregate the data points?
If you struggle to efficiently aggregate on the client-side, do it server side (and cache/memoize the results where possible). Do you have access to the server side code?
Do you need all the data at first load?
If no, find out what you need at first, then load the rest on demand.
Is the animation interactive?
If so, consider to remove non essential interactions. If the visualization is static just create the visualization server-side where possible.
What are the target browsers?
Study your user base browser and focus on the features they provide. If you don't have to support older browser you can focus on some speedups that the Web API provides you.
Do you have multiple visualization in the page?
Consider to split heavy dataviz into multiple views.
This list of questions is not exhaustive, but it is a starting point. If anybody has better questions to add just comment here and I'll update.
I want to visualize a Neo4j database in a graphical application. (I'm doing this primarily as a learning exercise).
I want it to behave almost identically to the visualization in Neo4j's WebAdmin: When the graphic appears, I want to see the nodes moving around as they settle into their final locations, and I want the user to be able to click and drag node icons around the screen and have them stick where they are dropped, with the rest of the graph adjusting to account for the change.
I have two questions.
What are the technical terms for the three requirements crudely described in the paragraph above?
I'm a Java programmer with no experience in JavaScript, but I'm thinking that, with this project, it's time to get some - sigma.js in particular seems very powerful and relatively simple. However, ultimately this needs to be done within a Java Swing application, and while I know there are various containers I can use to embed JS/HTML content into Swing, still it seems that a pure Java solution would be ideal, and I'm curious about any frameworks that might make this possible. I'm looking into Gephi now, but it doesn't seem anywhere near as powerful or as simple to use as sigma.js. Am I wrong in this assumption?
To summarize the second question: Which would be the better investment of my time: Learning sigma.js and the various JS frameworks (which will require me to get comfortable with JS in general), or learning to use Gephi in Java? (assuming I have a general and long-term interest in graph visualization)
Java visualization
Gephi does provide a toolkit for Java and Python which doesn't contains the UI modules, so unless you want to use Gephi itself to visualise your network you cannot embed its UI in your Java/Swing application as long as I know.
The toolkit contains all the algorithms and plugin infrastructure so if you want to use some of their analysis tool embedded in your app you can use that, otherwise I don't think it's your case.
There are other Java options if you want for graph visualisation here: Java graph library for dynamic visualisation
About Gephi and sigmaJS
IMHO Gephi is far more powerful than sigma.js: it has full SNA tools, multiple layouts, a data editor, exporters, plugin-systems...
One important factor is also the size of the dataset you want to visualise: while sigmaJS can handle up to 500 nodes in the view, Gephi can layout easily 50000 nodes with GPU support as well.
Gephi is a scientific tool made for people that don't want to code to visualise a network and it does it's job. SigmaJS is one of many JS solutions to visualise graphs on a web page.
You can always export to sigmaJS from Gephi with a plugin.
What's better?
At the end of the story I guess the tool you are going to use will depends on:
do you have to visualise a big dataset? -> Java solutions will win for big ones
do you need to distribute it easily? -> Web app / SigmaJS wins for distributed
do you want to have a full integration with your app? -> Java wins
The best one I've found is Keylines, but its not cheap.
Gephi is OK, but the last time I looked it did not support Neo4j 2.0
If your a programmer Neo4j is open source, so you can fork the repository on Git and use that (you will have to check the licencing model before you commercialise any product though)
This question already has answers here:
How to write a web-based music visualizer?
(4 answers)
Closed 5 years ago.
I'm trying to use JavaScript to display the waveform for and audio file, but I don't even know how to get started. I found the Audio Data API, but am unfamiliar with most audio terms and don't really know what is provided or how to manipulate it. I found examples of waveforms in JavaScript, but they are too complicated/I can't comprehend what is going on. Then my question is: how can you use JavaScript to create a waveform of a song on canvas, and what exactly is the process behind it?
Here's some sample code from my book (HTML5 Multimedia: Develop and Design) that does exactly that; Audio Waveform. It uses the Mozilla Audio Data API.
The code simply takes snapshots of the audio data and uses it to draw on the canvas.
Here's an article from the BBC's R&D team showing how they did exactly that to build a couple of JS libraries and more besides. The results all seem to be openly available and rather good.
Rather than use the Audio Data API, which you cannot be sure is supported by all your users' browsers, it might be better if you generate your waveform data server-side (the BBC team created a C++ app to do that) and then at least you are decoupling the client-side display aspect from the playback aspect. Also, bear in mind that the entire audio file has to reach the browser before you can calculate peaks and render a waveform. I am not sure if streaming files (eg MP3) can be used to calculate peaks as the file is coming in. But overall it is surely better to calculate your peaks once, server-side, then simply send the data via JSON (or even create + cache your graphics server-side - there are numerous PHP chart libraries or you can do it natively with GD).
For playback on the browser, there are several good (non-Flash!) options. Personally I like SoundManager 2 as the code is completely decoupled from display, meaning that I am free to create whatever UI / display that I like (or that the client wants). I have found it robust and reliable although I had some initial difficulty on one project with multiple players on the same page. The examples on their site are not great (imho) but with imagination you can do some cool things. SM2 also has an optional Flash fallback option for antique browsers.
I did just that with the web audio api and I used a project called wavesurfer.
http://www.html5audio.org/2012/10/interactive-navigable-audio-visualization-using-webaudio-api-and-canvas.html
What it does is, it draws tiny rectangles and uses an audio buffer to determine the height of each rectangle. Also possible in wavesurfer is playing and pausing using space bar and clicking on the wave to start playing at that point.
Update: This POC website no longer exists.
To check out what I made go to this site:
Update: This POC website no longer exists.
This only works in a google chrome browser and maybe safari but I'm not sure about that.
Let me know if you want more info.
Not well supported yet but take a look at this Firefox tone generator.
I am looking to create a web based GPS skyplot.
Currently just in the planning stages. Was wondering if anyone knew any javascript libraries or such in which this would be best to start with or have a look at, of if you have done something similar before. I know Flot is decent for plotting but unsure if it would be easy in this scenario.
TLDR: Looking for javascript libraries or other alternatives to create a web based GPS Skyplot.
Further info.
I would like to be able to maintain it all generally in javascript / HTML but am open to other alternatives. I will have a server passing me the GPS details.
Skyplot Examples: For those who don't know.
http://www.gpsoftnav.com/skyplot.html
http://www.novariant.com/resources/technologies/skyplot.cfm#
I came accross:Geographic Information Systems (Stack Exchange) yesterday, would make a good site for these kind of questions.
So if anyone is interested in this please also go make a commit :). Otherwise I am still looking for any feedback on the question.
Is it the graphical issues you are concerned with, or are you intending to also calculate which satellites are visible, and their azimuths and elevations at the given location and time?
If it's just the graphical part you are concerned with, I would use jQuery and Keith Wood's SVG plugin - see http://keith-wood.name/svg.html . This gives you a Javascript handle to Scalable Vector Graphics, for drawing circles, lines and dots on a canvas in the web page. It's simple to use, and the page I've linked to has examples that should help.
I am developing a web application that should display data points below the Earth's surface. It should also include user navigation, zoom, and rotational capabilities. It reads in the data from a XML file and should display 500-1000 spheres. Ideally, I would like to use HTML5, but it doesn't run in IE8.
This is a Flash application that is somewhat similar to what I want (minus the globe around the spheres):
http://demo.tufat.com/applets/molecule/index.html
There is also a good jQuery application that allows for 3d rotation out there.
So, the question is JavaScript/jQuery or AS3? I know Flash handles large amounts of data better but is Flash dying out? The application must run efficiently on most browsers.
Flash is not dying. I am not sure which Blogging Social Media Expert told you that.
Choose a language and just stick with it. Unless you know how to handle your memory and work with Paper Vision or Unity you should go with JavaScript for most likely you will end up with leaks if you do not do garbage collection, 500-1000 spheres is alot.