A Simple Canvas Vignette - Gists · GitHub

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positlabs/Vignette.js Created March 21, 2013 19:47 Show Gist options

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Learn more about clone URLs Clone this repository at <script src="https://gist.github.com/positlabs/5216101.js"></script> Save positlabs/5216101 to your computer and use it in GitHub Desktop. Download ZIP A simple canvas vignette Raw Vignette.js This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters Show hidden characters

Vignette = function (canvas) {

var alpha = .7,

context,

visible,

data;

(function initView() {

context = canvas.getContext("2d");

show();

})();

function draw() {

var w = canvas.width = window.innerWidth;

var h = canvas.height = window.innerHeight;

context.clearRect(0, 0, w, h);

context.rect(0, 0, w, h);

// create radial gradient

var outerRadius = w * .5;

var innerRadius = w * .2;

var grd = context.createRadialGradient(w / 2, h / 2, innerRadius, w / 2, h / 2, outerRadius);

// light blue

grd.addColorStop(0, 'rgba(0,0,0,0)');

// dark blue

grd.addColorStop(1, 'rgba(0,0,0,' + alpha + ')');

context.fillStyle = grd;

context.fill();

}

this.show = function() {

if (!visible) {

visible = true;

canvas.style.display = "block";

window.addEventListener("resize", draw);

draw();

}

}

this.hide = function() {

if (!visible) {

visible = false;

canvas.style.display = "none";

window.removeEventListener("resize", draw);

}

}

};

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