Fabricjs whiteboard

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A Sample piece of code that shows how i implement a whiteboard that let people to ask questions about math. The app use javascriptcanvas via fabric. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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Building a collaborative whiteboard with Fabric.js

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Canvas-Fabric-Whiteboard A Sample piece of code that shows how i implement a whiteboard that let people to ask questions about math.

You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.Written by Jeroen van Veen on 19th February Fabric.

A colleague of mine asked whether I wanted to write a javascriptish whiteboard that allows multiple persons to draw on a shared canvas as a mini project for another colleague.

Challenge accepted! Canvas is a nice medium, but it lacks scene abstraction.

fabricjs whiteboard

Other artistic tools like text and shapes have their own set of parameters as well. Summarised; writing such a scene-tracking library would have been a massive effort and was not an option for a hackathon-style project. So I gave Fabric. According to the website, Fabric.

Well, I can only endorse this! The library makes it a breeze to draw shapes, text, strokes and other media on the canvas. The awesome part is that it keeps track of these objects afterwards the scene partso they can be moved, rotated, transformed and deleted as vector objects using built-in UI-controls.

fabricjs whiteboard

Next I had to hook up other users to the same canvas drawing session. Using raw websockets would have been fine, but it would require a lot of boilerplate code that Socket. After I got Socket. This is another thing that got me excited about Fabric. After wiring up several events, I tried to figure out an easy way to restore the current state of a canvas drawing after a user reloaded the browser.

There has to be an authoritative source that contains the current state of the canvas, preferably the server. I figured that I had to store all actions in a database and rebuild the canvas manually.

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Hell no! It turns out that Fabric. So, by adding a serverside Fabric. As a bonus, serverside Fabric.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again.

A Sample piece of code that shows how i implement a whiteboard that let people to ask questions about math. The app use javascriptcanvas via fabric. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. JavaScript Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again.

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Latest commit Fetching latest commit…. Canvas-Fabric-Whiteboard A Sample piece of code that shows how i implement a whiteboard that let people to ask questions about math. You signed in with another tab or window. Reload to refresh your session.

fabricjs whiteboard

You signed out in another tab or window. Nov 20, Today I'd like to introduce you to Fabric. Fabric provides a missing object model for canvas, as well as an SVG parser, layer of interactivity, and a whole suite of other indispensable tools. It is a fully open-source project, licensed under MIT, with many contributions over the years. Fabric started aroundafter discovering the pains of working with native canvas API. The original author was creating an interactive design editor for printio.

The kind of interactivity they wanted only existed in Flash apps in those days. Even right now, very few come close to what became possible with Fabric. Canvas allows us to create some absolutely amazing graphics on the web these days.

But the API it provides is disappointingly low-level.

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It's one thing if we simply want to draw few basic shapes on canvas and forget about them. But as soon as there's need for any kind of interaction, change of picture at any point, or drawing of more complex shapes — situtation changes dramatically. Native canvas methods only allow us to fire off simple graphic commands, blindly modifying entire canvas bitmap. Want to draw a rectangle? Use fillRect left, top, width, height.

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Want to draw a line? Use a combination of moveTo left, top and lineTo x, y. It's as if we're painting canvas with a brushlayering more and more oil on top, with very little control. Instead of operating on such low level, Fabric provides simple but powerful object model on top of native methods.

Let's take a look at a simple example demonstrating this difference. Let's say we want to draw a red rectangle somewhere on canvas. At this point, there's almost no difference in size — the two examples are pretty similar.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. In an angular application, I implemented a simple whiteboard with Fabric. The shapes are botch empty and filled circle and rectangle, and a basic UML diagram template, which are two single rects on top of each other. When I select a single or multiple objects, the position of all instances of rects and circles are automatically transformed to the canvas' origin, only leaving the selection marker at its original position.

Oddly, this not happens with the UML template, which in the end also is composed of two simple rects like the transformer one, except with another initial size. Freehand drawings from the built-in function are not concerned too. When this elements are selected individually, they remain "in position". I did not overwrite any selection methods. Worth mentioning is that the whiteboard is located in a widget inside the app, meaning that you can drag the whiteboard around the display, hence the values adjustedX and adjustedY.

However, the objects are always transformed into the origin, and other objects work normally, so I tend to exclude that. When dropping the object, I just clone this element, remove the original one and drop the cloned one, and tadaaa, the objects do not get transformed anymore. Learn more.

Asked 11 months ago. Active 9 months ago.

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Viewed times. UML: if! SHAPE: if! Valentino Ru Valentino Ru 4, 11 11 gold badges 31 31 silver badges 67 67 bronze badges. Is this behaviour caused by false event binding? If so, why? As internally it binds event to upper canvas, so use methods given to bind the events, I haven't checked further.

Active Oldest Votes. So I wasn't really able to find the cause of this behaviour, but found a work-around. Sign up or log in Sign up using Google. Sign up using Facebook.

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Whiteboard was initially created by Michael Kemp, a Kainos Software Engineer, for his final year university project. The goal of Whiteboard is to allow people to collaborate on projects through its whiteboard functionality and use of real time communication. Using webRTC it allows for in-browser video conferencing and its whiteboard feature allows any participant in the call to effectively plan or communicate their ideas through drawing sketches and diagrams that can be moved, rotated and deleted as needed.

It aims to improve the way teams work together across multiple geographical locations. Once it has been installed locally, you will be able to push your own configuration to Heroku.

XirSys This project requires you to create a XirSys account in order to allow you to communicate with other computers on internal networks. NOTE This project also provides functionality whereby an email can be sent to notify someone of a planned online meeting however for now this has been disabled for the initial configuration of the project. If you would like to enable this feature please see the " Invite Functionality " section below. Testing To run associated tests Karma must be installed. To do this follow the instructions on the Karma website.

Run karma start karma. Test output will be displayed in the terminal. NOTE If you wish to enable the invite functionality then alterations to some tests will need to be made.

Please see the Testing Invite Functionality section below for more details. Connecting Another Computer To Localhost Once you have whiteboard running on your local machine, others will be able to join meetings that you host. To do this they must enter the IP address of your machine into their web browser in the following format:.

From here the user will be able to enter a meeting room pin or they can directly connect to a meeting by entering ammending their browser URL to the following:. NOTE: Some browsers such as the latest version of Google Chrome may prevent access to a computer's camera and microphone and thus prevent real-time communication.

If this is the case please follow the instructions below to utilise ngrok in order to bypass this issue.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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fabricjs whiteboard

I'm using fabric. I want freehand drawing paths to be drawn concurrently by several users. To do this I figured I could create a new PencilBrush for each remote user and simulate freehand drawing by calling the onMouseDownonMouseMove and onMouseUp methods of the PencilBrush class whenever the remote user performs those actions. It draws two paths concurrently and the user can also draw on the canvas meanwhile.

As you see one of the paths is never seen before onMouseUp and freehand drawing it's not very pretty. Can you think of a way to make it work smoothly without having to mess up too much with fabric.

The one solution I thought of is having a separate canvas element for each PencilBrushbut that would be messing up with fabric. Any other suggestions? I have implemented this one solution I have been thinking of in my question separate canvas element for each user.

I am not sure to what number of users this can scale to, or if this is a good solution, but in this example at least it seems to work well. Learn more. Concurrent freehand drawing in fabric.

Asked 6 years, 5 months ago. Active 2 years, 6 months ago. Viewed 1k times. EDIT I have implemented this one solution I have been thinking of in my question separate canvas element for each user. Active Oldest Votes. Sign up or log in Sign up using Google. Sign up using Facebook.

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