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implode.js
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implode.js
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importScripts('helpers.js')
postMessage(['sliders', defaultControls.concat([
{label: 'Rays', value: 1000, min: 100, max: 5000},
{label: 'Threshold', value: 128, min: 1, max: 254},
{label: 'Step size', value: 5, min: 1, max: 20, step: 0.1},
{label: 'Dither', value: 0, min: 0, max: 1, step: 0.01},
{label: 'Optimize route', type:'checkbox', checked:true},
])]);
onmessage = function(e) {
const [ config, pixData ] = e.data;
const getPixel = pixelProcessor(config, pixData)
const w=config.width, h=config.height, d=(w+h)*0.4;
let output=[]
let angle=0
for (let i=0; i<config.Rays;i++) {
let line=[]
angle+= 2*3.1415926535* (i/config.Rays +0.25)
let xstep=Math.cos(angle)*config['Step size'],
ystep=Math.sin(angle)*config['Step size']
let x=w/2 + (i/config.Rays)*d*Math.cos(angle),
y=h/2 + (i/config.Rays)*d*Math.sin(angle)
do {
if (getPixel(x,y)*(1+config.Dither*(Math.random()-0.5)) >config.Threshold) line.push([x,y])
else {
if (line.length>1) output.push(line);
line=[]
}
x+=xstep
y+=ystep
} while (x>0 && y>0 && x<w && y<h)
if (line.length) output.push(line)
}
if (output.length) {
if (config['Optimize route']) {
postMessage(['msg', "Optimizing..."]);
output = sortlines(output)
}
postLines(output)
}
postMessage(['msg', "Done"]);
}