canvas-fit-margin-ts

canvas-fit rewritten in Typescript. Small module for fitting a canvas element within the bounds of its parent. Useful, for example, for making a canvas fill the screen.

This module exports a named function that takes as input the HTMLCanvasElement and an option object. It has some limitations in respect of original canvas-fit:

• does not work with SVG
• the resize function return [width, height]
• not dynamic (change the options implies to re-create).

Usage

resize = createFit(canvas[, options])

Creates a resize function for your canvas element. Calling this function will resize the canvas to fit its parent element.

Here's a simple example to make your canvas update its dimensions when resizing the window:

import { createFit }
const canvas = document.createElement('canvas')
window.addEventListener('resize', createFit(canvas), false)

You might want to pass the options.parent: the element that the canvas should be fitting within. Or you might wanto to pass the options.margin: the margin that the canvas will have. You can also set the scale of the canvas element relative to its styled size on the page using the option.scale field – for example, passing in window.devicePixelRatio here will scale the canvas resolution up on retina displays.

const opts: CanvasFitOptions = {
  parent: document.getElementById('canvas-container'),
  margin: 10,
  scale: window.devicePixelRatio,
}
 
window.addEventListener('resize', createFit(canvas, opts), false)

License

MIT. See LICENSE.md for details.