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Merge pull request #935 from 409H/develop
EAL Release v1.19
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Original file line number | Diff line number | Diff line change |
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// source: https://raw.githubusercontent.com/ethereum/blockies/86c3e71ec33a31424ac8dcae449ec9c09c4ab3cb/blockies.js | ||
(function() { | ||
// The random number is a js implementation of the Xorshift PRNG | ||
var randseed = new Array(4); // Xorshift: [x, y, z, w] 32 bit values | ||
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function seedrand(seed) { | ||
for (var i = 0; i < randseed.length; i++) { | ||
randseed[i] = 0; | ||
} | ||
for (var i = 0; i < seed.length; i++) { | ||
randseed[i%4] = ((randseed[i%4] << 5) - randseed[i%4]) + seed.charCodeAt(i); | ||
} | ||
} | ||
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function rand() { | ||
// based on Java's String.hashCode(), expanded to 4 32bit values | ||
var t = randseed[0] ^ (randseed[0] << 11); | ||
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randseed[0] = randseed[1]; | ||
randseed[1] = randseed[2]; | ||
randseed[2] = randseed[3]; | ||
randseed[3] = (randseed[3] ^ (randseed[3] >> 19) ^ t ^ (t >> 8)); | ||
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return (randseed[3]>>>0) / ((1 << 31)>>>0); | ||
} | ||
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function createColor() { | ||
//saturation is the whole color spectrum | ||
var h = Math.floor(rand() * 360); | ||
//saturation goes from 40 to 100, it avoids greyish colors | ||
var s = ((rand() * 60) + 40) + '%'; | ||
//lightness can be anything from 0 to 100, but probabilities are a bell curve around 50% | ||
var l = ((rand()+rand()+rand()+rand()) * 25) + '%'; | ||
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var color = 'hsl(' + h + ',' + s + ',' + l + ')'; | ||
return color; | ||
} | ||
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function createImageData(size) { | ||
var width = size; // Only support square icons for now | ||
var height = size; | ||
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var dataWidth = Math.ceil(width / 2); | ||
var mirrorWidth = width - dataWidth; | ||
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var data = []; | ||
for(var y = 0; y < height; y++) { | ||
var row = []; | ||
for(var x = 0; x < dataWidth; x++) { | ||
// this makes foreground and background color to have a 43% (1/2.3) probability | ||
// spot color has 13% chance | ||
row[x] = Math.floor(rand()*2.3); | ||
} | ||
var r = row.slice(0, mirrorWidth); | ||
r.reverse(); | ||
row = row.concat(r); | ||
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for(var i = 0; i < row.length; i++) { | ||
data.push(row[i]); | ||
} | ||
} | ||
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return data; | ||
} | ||
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function buildOpts(opts) { | ||
var newOpts = {}; | ||
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newOpts.seed = opts.seed || Math.floor((Math.random()*Math.pow(10,16))).toString(16); | ||
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seedrand(newOpts.seed); | ||
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newOpts.size = opts.size || 8; | ||
newOpts.scale = opts.scale || 4; | ||
newOpts.color = opts.color || createColor(); | ||
newOpts.bgcolor = opts.bgcolor || createColor(); | ||
newOpts.spotcolor = opts.spotcolor || createColor(); | ||
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return newOpts; | ||
} | ||
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function renderIcon(opts, canvas) { | ||
opts = buildOpts(opts || {}); | ||
var imageData = createImageData(opts.size); | ||
var width = Math.sqrt(imageData.length); | ||
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canvas.width = canvas.height = opts.size * opts.scale; | ||
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var cc = canvas.getContext('2d'); | ||
cc.fillStyle = opts.bgcolor; | ||
cc.fillRect(0, 0, canvas.width, canvas.height); | ||
cc.fillStyle = opts.color; | ||
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for(var i = 0; i < imageData.length; i++) { | ||
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// if data is 0, leave the background | ||
if(imageData[i]) { | ||
var row = Math.floor(i / width); | ||
var col = i % width; | ||
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// if data is 2, choose spot color, if 1 choose foreground | ||
cc.fillStyle = (imageData[i] == 1) ? opts.color : opts.spotcolor; | ||
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cc.fillRect(col * opts.scale, row * opts.scale, opts.scale, opts.scale); | ||
} | ||
} | ||
return canvas; | ||
} | ||
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function createIcon(opts) { | ||
var canvas = document.createElement('canvas'); | ||
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renderIcon(opts, canvas); | ||
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return canvas; | ||
} | ||
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var api = { | ||
create: createIcon, | ||
render: renderIcon | ||
}; | ||
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if (typeof module !== "undefined") { | ||
module.exports = api; | ||
} | ||
if (typeof window !== "undefined") { | ||
window.blockies = api; | ||
} | ||
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})(); |
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