Drawing A Circle In Javascript With Source Code
In this tutorial Drawing A Circle In Javascript , you’ll learn how to draw a circular arc with JavaScript’s arc() method. The Canvas 2D API has a function called arc(). You can draw a circular arc with the arc() function.
The arc() method creates a circular arc with a radius of radius centered at (x,y). The arc will begin and end at startAngle and endAngle, respectively. startAngle and endAngle are both measured in radians.
This Javascript Project With Source Code also includes a downloadable javascript source code for free, just find the downloadable source code below and click to start downloading.
I have here a suggested list of Best JavaScript Projects with Source Code Free to download and I’m sure this can help you to improve your skills in JavaScript programming and web development as a whole.
To start executing a Drawing A Circle In Javascript With Source Code , makes sure that you have any platform in creating a JavaScript, CSS, bootstrap, and HTML installed in your computer, in my case I will use Sublime Text.
Drawing A Circle In Javascript With Source Code: Steps on how to create the project
Time needed: 5 minutes
These are the steps on how to create Drawing A Circle In Javascript With Source Code
- Step 1: Create a folder.
First, create a folder and named it.
- Step 2: Open the folder in “Sublime Text”.
Second ,after creating a folder, open it in “sublime text“.
- Step 3: Create a html file.
Third, create a “html” file and save it as “index.html“
The code given below is for the html module
<!DOCTYPE html> <html> <head> <meta charset=utf-8> <title>Draw a circle</title> <head> <body onload="draw();"> <canvas id="circle" width="150" height="150"></canvas> </body> </html>
In the code above given which is the html module of the project.
The code given below is for the javascript module
<script>
function draw()
{
var canvas = document.getElementById('circle');
if (canvas.getContext)
{
var ctx = canvas.getContext('2d');
var X = canvas.width / 2;
var Y = canvas.height / 2;
var R = 45;
ctx.beginPath();
ctx.arc(X, Y, R, 0, 2 * Math.PI, false);
ctx.lineWidth = 3;
ctx.strokeStyle = 'skyblue';
ctx.stroke();
}
}
</script>In the code above given which is the javascript module of the project.
Project Output
| ABOUT PROJECT | PROJECT DETAILS |
|---|---|
| Project Name : | Drawing A Circle In Javascript |
| Project Platform : | JavaScript |
| Programming Language Used: | php,javascript,html,css |
| Developer Name : | itsourcecode.com |
| IDE Tool (Recommended): | Sublime |
| Project Type : | Web Application |
| Database: | None |
| Upload Date: | July 27, 2021 |
Downloadable Source Code
Summary
This JavaScript Project With Source Code is simply in HTML, CSS, and JavaScript. To start creating this Simple Javascript Project With Source Code, make sure that you have basic knowledge in HTML, CSS and Javascript. In this Javascript project also includes a downloadable source code for free.
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Inquiries
If you have any questions or suggestions about Drawing A Circle In Javascript With Source Code , please feel free to leave a comment below.
How Drawing A Circle works
This JavaScript project demonstrates common patterns used across web applications. The code is intentionally small so it can be understood in a few reading sessions and extended for a real project.
Extending Drawing A Circle for a capstone project
- Persist data. Add localStorage or a Node.js backend so state survives page reloads.
- Style it. Add Bootstrap, Tailwind, or a custom design so the project looks polished for defense.
- Add authentication. Login and role-based access control for multi-user scenarios.
- Deploy live. Push to GitHub Pages, Netlify, or Vercel so panel members can access it from any device.
- Test on mobile. Use Chrome DevTools device mode to confirm the layout works on phones.
Working code snippet
// A minimal JavaScript pattern for Drawing A Circle
(function () {
const state = { items: [] };
function add(item) {
state.items.push(item);
render();
}
function render() {
const container = document.getElementById("output");
container.innerHTML = state.items.map(x => `<li>${x}</li>`).join("");
}
document.getElementById("addBtn").addEventListener("click", () => {
const input = document.getElementById("input");
if (input.value) {
add(input.value);
input.value = "";
}
});
})();
Best practices for this JavaScript pattern
- Use const and let. Never var. It has function-scope surprises that trip up beginners.
- Wrap in an IIFE or module. Prevents polluting the global namespace.
- Attach one event listener per action. Not multiple listeners on the same button.
- Separate state from rendering. Update state first, then call render(). Do not mutate DOM directly from event handlers.
Deployment checklist for this JavaScript project
Before showing the project to a client, panel member, or user, run through this checklist:
- Minify the JavaScript. Use esbuild or terser to shrink the file for faster page load.
- Add a .gitignore. Exclude node_modules, .env, and IDE folders before committing to GitHub.
- Set up a README. Explain what the project does, how to install, and how to contribute.
- Add screenshots. A picture beats a paragraph when someone lands on your repo.
- Enable HTTPS. GitHub Pages and Netlify give free HTTPS by default; use it.
- Test in real browsers. Chrome, Firefox, Safari, Edge — not just the one you develop in.
- Check mobile layout. Chrome DevTools device mode simulates common phones and tablets.
Official documentation
Frequently Asked Questions
How does this JavaScript project work?
Built with vanilla JavaScript (no framework) or Vue/Node. HTML structure, CSS styling, JS logic via DOM manipulation + event listeners. Backend optional (Node.js or PHP). Ready to extend for BSIT capstone scope.
What JavaScript runtime or browser does this project need?
Pure frontend projects (vanilla JS, Vue, jQuery) run in any modern browser (Chrome 90+, Firefox 88+, Safari 14+, Edge 90+) – no install needed. Node.js projects need Node.js 18 LTS or 20 LTS (download from nodejs.org). Run: npm install in project folder, then npm start or node app.js.
How do I run this JavaScript project locally?
For pure HTML/CSS/JS: open index.html in your browser, or use VS Code Live Server extension for auto-reload. For Vue projects: npm install then npm run dev (Vite) or npm run serve (Vue CLI). For Node.js: npm install then npm start. For projects with backend (PHP+MySQL): place in XAMPP htdocs, start Apache + MySQL, browse to localhost/project.
Can I use this JavaScript project for a BSIT capstone or thesis?
Yes. Extend it: add user authentication (JWT for SPA, sessions for traditional), role-based access, real backend (Node.js+Express+MongoDB or PHP+MySQL), responsive design (Bootstrap/Tailwind), PDF exports (jsPDF), real-time features (Socket.IO). Pair with Chapter 1-5 documentation matching your panel’s rubric.
Why am I getting ‘Uncaught ReferenceError’ or ‘Cannot read property of undefined’?
Three common JavaScript issues: (1) Script tag placement wrong, put
Angel Jude Suarez
Full-Stack Developer at PIES IT Solution
Focuses on Python development, machine learning, and AI integration. Has built production AI systems including OpenAI Whisper integration for medical transcription and GPT-4o-powered diagnosis assistance. Strong background in pandas, scikit-learn, and TensorFlow.
Expertise: Python · PHP · Java · VB.NET · ASP.NET · Machine Learning · AI Integration · OpenCV · Django · CodeIgniter
· View all posts by Angel Jude Suarez →
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