👀 Views: 43 💬 Answers: 1 📅 Created: 2025-08-26

html canvas responsive-design JavaScript

I'm trying to debug I just started working with I've searched everywhere and can't find a clear answer..... I'm working on a personal project and I'm trying to create a responsive drawing application using the `<canvas>` element, but I'm running into issues with resizing... Initially, I set the canvas size in pixels directly in the HTML like this: ```html <canvas id='myCanvas' width='800' height='600'></canvas> ``` However, I want the canvas to resize based on the window dimensions. I wrote a simple JavaScript function to adjust its width and height on window resize events: ```javascript const canvas = document.getElementById('myCanvas'); function resizeCanvas() { canvas.width = window.innerWidth; canvas.height = window.innerHeight; // Clear the canvas after resizing const ctx = canvas.getContext('2d'); ctx.clearRect(0, 0, canvas.width, canvas.height); } window.addEventListener('resize', resizeCanvas); resizeCanvas(); // Initial call to set size on load ``` The issue I'm facing is that while the canvas resizes correctly, the drawings on the canvas do not scale accordingly. I can see part of my drawing is cut off or distorted after resizing. I've confirmed that the resizing is triggered correctly by logging the new dimensions, but the rendering seems to be off. I also tried using CSS to scale the canvas: ```css canvas { width: 100%; height: 100%; } ``` This resulted in even worse distortion, as the pixel density changes and the drawing looks blurry. I'm currently using Chrome 117 and have also checked the behavior in Firefox, which seems to handle scaling better but still isn't perfect. How can I properly adjust the canvas so that the drawings maintain their integrity after resizing? Am I missing something fundamental in how the `<canvas>` element handles its dimensions? Any tips on best practices for responsive canvas implementations would be greatly appreciated. My development environment is Ubuntu. What am I doing wrong? I'm working on a web app that needs to handle this. Has anyone else encountered this? This is happening in both development and production on Windows 10. My development environment is Windows 11.