How to Make an HTML5 Canvas Element Fit the Entire Window?

Resizing Canvas to Fit Window

Problem:

While you can effortlessly scale a

element to fit the available space by setting its height and width to 100%, scaling an HTML5 element seems like an enigma.

Solution:

To elegantly resolve this issue and ensure the canvas element conforms to the window's dimensions, consider the following approach:

JavaScript:

/* Essential for aligning elements relative to the canvas' current proportions. */
function draw() {
  var ctx = (a canvas context);
  ctx.canvas.width  = window.innerWidth;
  ctx.canvas.height = window.innerHeight;
  //...drawing code...
}

CSS:

html, body {
  width:  100%;
  height: 100%;
  margin: 0;
}

Implementation Details:

• The JavaScript function dynamically sets the canvas element's width and height properties to match the dimensions of the window.
• The CSS rules remove any margins or padding around the and elements, allowing the canvas to expand fully.

This solution has proven to be performant and visually satisfying, enabling your canvas elements to adapt seamlessly to their surrounding environment.

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