Can You Make an HTML5 Canvas Resize Seamlessly with the Browser Window?

Fitting an HTML5 Canvas Perfectly within a Browser Window

When resizing a page, elements like

can be scaled seamlessly by setting their height and width properties to 100%. However, does the same apply to an element?

The Solution: Automatic Scaling with CSS and JavaScript

The key lies in a combination of CSS and JavaScript:

1. JavaScript:

   • In your drawing function, adjust the width and height to match the current window dimensions:

     <code class="javascript">function draw() {
       var ctx = (your canvas context);
       ctx.canvas.width = window.innerWidth;
       ctx.canvas.height = window.innerHeight;
       // Drawing code here...
     }</code>

2. CSS:

   • Define the CSS for the and its container:

     <code class="css">html, body {
       width: 100%;
       height: 100%;
       margin: 0;
     }</code>

By setting the HTML and body elements to full width and height, the is constrained to fit within the window. The script adjusts its size dynamically to ensure a perfect fit at all times.

This solution has proven to have minimal performance impact, making it an efficient way to create resizable canvases.

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