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polyspiral.js
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polyspiral.js
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importScripts('helpers.js')
postMessage(['sliders', defaultControls.concat([
{label: 'Polygon', value: 4, min: 3, max: 8},
{label: 'Frequency', value: 150, min: 5, max: 256},
{label: 'Amplitude', value: 1, min: 0.1, max: 5, step: 0.1},
{label: 'Spacing', value: 1, min: 0.5, max: 5, step: 0.1},
])]);
onmessage = function(e) {
const [ config, pixData ] = e.data;
const getPixel = pixelProcessor(config, pixData)
let r = 5;
let a = 0;
const cx = config.width/2;
const cy = config.height/2;
let points = [];
points.push([cx,cy])
let x = cx, y = cy;
let radius = 1;
let theta = 0;
let travelled = 0;
let segmentLength = 1;
const pi = Math.PI;
let incrTheta = 2*pi/config.Polygon;
let incrLength = Math.round(10/config.Polygon);
while ( x>0 && y>0 && x<config.width && y<config.height ) {
z = getPixel( x , y )
r = config.Amplitude * z *0.02*config.Spacing;
a += z / config.Frequency;
let displacement = Math.sin(a)*r;
points.push([
x - displacement*Math.sin(theta) ,
y + displacement*Math.cos(theta)
])
if (++travelled >= segmentLength){
travelled = 0
theta += incrTheta
segmentLength+= incrLength;
}
x += config.Spacing*Math.cos(theta)
y += config.Spacing*Math.sin(theta)
}
postLines(points);
}