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canvas-fit

v1.5.0

Published

Small module for fitting a canvas element within the bounds of its parent.

Downloads

737,578

Readme

canvas-fit stable

Small module for fitting a canvas element within the bounds of its parent. Useful, for example, for making a canvas fill the screen. Works with SVG elements too!

Usage

NPM

resize = fit(canvas[, parent[, scale]])

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:

var fit = require('canvas-fit')
var canvas = document.createElement('canvas')

window.addEventListener('resize', fit(canvas), false)

You might want to override the parent element that the canvas should be fitting within: in which case, pass that element in as your second argument:

window.addEventListener('resize'
  , fit(canvas, window)
  , false
)

You can also set the scale of the canvas element relative to its styled size on the page using the scale argument – for example, passing in window.devicePixelRatio here will scale the canvas resolution up on retina displays.

resize.scale = <Number>

Dynamically change the canvas' target scale. Note that you still need to manually trigger a resize after doing this.

resize.parent = <DOMElement>

Dynamically change the canvas' parent element. Note that you still need to manually trigger a resize after doing this.

resize.parent = () => [width, height]

Instead of filling a given element, explicitly set the width and height of the canvas. Note that this value will still be scaled up according to resize.scale

resize.parent = function() {
  return [ window.innerWidth - 300, window.innerHeight ]
}

License

MIT. See LICENSE.md for details.