• Create a new project in GitHub and clone that to your desktop. In my case that is the nurbs project.

  • Create an index.html file inside the project. Usually this is the file that is used my many to store the primary code of the website or the entry point code of the website.

  • An HTML file is made of two parts. The head and the body. From what I understand the head is the part where all the scripts and style live and the body is the part where the primary layout of the website live.

    <!DOCTYPE html>
        <!-- Load the Paper.js library -->
        <script type="text/javascript" src="node_modules/paper/dist/paper-full.js"></script>
        <script type="text/paperscript" src="line.js" canvas="myCanvas">
        <style type="text/css">
        body {height: 100%;}
        /* Scale canvas with resize attribute to full size */
        canvas[resize] {
            width: 100%;
            height: 100%;
        <canvas id="myCanvas" resize></canvas>
  • In this example I wish to learn how to run a script on the website and also how to use paper.js.

  • The first step is to open the directory in cmder and run the following command

    npm install paper

    This will install paper in the repository. This simply means that it will copy the source code of the paper.js into the repository which we can then access locally.

  • Now once the initial setup is done the folder should look something like this image-20210214184907365

  • The directory node_modules contains the code for paper.js. This is also referenced in the head of index.html. This reference is somewhat similar to import statement in python, as in it imports all the methods from paper.js for our use.

    <!-- Load the Paper.js library -->
        <script type="text/javascript" src="node_modules/paper/dist/paper-full.js"></script>
  • Next, we need to tell the browser where to look for the primary source code for our JavaScript. In my case I have added the JS code to line.js

    <script type="text/paperscript" src="line.js" canvas="myCanvas">

    paper.js will draw everything on a canvas object that we will create inside the body of our page. In the above line the script tag will link the PaperScript code to the canvas with the given ID and produces a Project and View object for it on the fly. So here we are just telling the browser that use the canvas myCanvas to draw using the line.js script.

  • Finally in the body of the HTML we will create a canvas object and give it the id myCanvas

        <canvas id="myCanvas" resize></canvas>
  • Ok, so now the page is ready. To start adding paper object to the code we can simply update our line.js file. Initially I will just try out the example given on their website.

    // Create a circle shaped path with its center at the center
    // of the view and a radius of 30:
    var path = new Path.Circle({
        center: view.center,
        radius: 30,
        strokeColor: 'black'
    function onResize(event) {
        // Whenever the window is resized, recenter the path:
        path.position = view.center;
  • Now to finally view the page I need to setup a local server because read this. The way to do is it simply go to the project root folder and run

    python -m http.server
  • This will create a local server that I can access at http://localhost:8000/

  • Now I can actively debug the project. To debug I have to press ctrl + shift + i and go to console tab.