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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 |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| // 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 | ||
|
|
||
| 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); | ||
| } | ||
| } | ||
|
|
||
| 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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