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pixel-metaball.js
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pixel-metaball.js
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const canvasSketch = require('canvas-sketch');
const chroma = require('chroma-js');
const { squareGrid } = require('./grid');
const { randomNumber } = require('./math');
const settings = {
animate: true,
duration: 8,
dimensions: [640, 640],
scaleToView: true,
// playbackRate: 'throttle',
// fps: 24,
clrs: [
['#111113', '#8925DD', '#40EDE8'],
['#462A4A', '#A04595', '#EA433E'],
['#FEE6EC', '#353FFB', '#FDFD72'],
['#e3a943', '#c37a01', '#f8a006'],
['#290d0c', '#c41a1d', '#e4413f'],
['#620a09', '#9f0f0c', '#800c0a'],
// ['#f6bfb1', '#f76246', '#e82e20'],
['#f6bfb1', '#e82e20', '#e82e20'],
],
size: 1.2,
};
canvasSketch(() => {
const SUM_THRESHOLD = 1;
const NUM_CIRCLES = 5;
const RESOLUTION = 128;
const scale = chroma
.scale(settings.clrs[settings.clrs.length - 1])
.domain([0, SUM_THRESHOLD, SUM_THRESHOLD * 8]);
let circles = [];
for (var i = 0; i < NUM_CIRCLES; i++) {
circles.push({
// x: randomNumber(
// settings.dimensions[0] * 0.4,
// settings.dimensions[0] * 0.8,
// ),
// y: randomNumber(
// settings.dimensions[1] * 0.6,
// settings.dimensions[1] * 0.8,
// ),
// r: randomNumber(40 * 1.25, 80 * 1.25),
x: randomNumber(0, settings.dimensions[0]),
y: randomNumber(0, settings.dimensions[1]),
r: randomNumber(40, 80),
vx: randomNumber(-5, 5),
vy: randomNumber(-5, 5),
});
}
return ({ context, frame, width, height, playhead }) => {
// Clear
context.clearRect(0, 0, width, height);
context.fillStyle = settings.background;
context.fillRect(0, 0, width, height);
// Move the circles
circles.forEach(c => {
c.x += c.vx;
c.y += c.vy;
if (c.x - c.r < 0) {
c.vx = +Math.abs(c.vx);
}
if (c.x + c.r > width) {
c.vx = -Math.abs(c.vx);
}
if (c.y - c.r < 0) {
c.vy = +Math.abs(c.vy);
}
if (c.y + c.r > height) {
c.vy = -Math.abs(c.vy);
}
});
// Draw the metaballs
squareGrid({
size: width,
resolution: RESOLUTION,
padding: 0,
forEach: ({ x, y, s }) => {
const sum = circles.reduce((sum, c) => {
const dx = x - c.x;
const dy = y - c.y;
const d2 = dx * dx + dy * dy;
return sum + (c.r * c.r) / d2;
}, 0);
// Draw the pixel
// if (sum > SUM_THRESHOLD) {
const a = s * settings.size;
context.save();
context.fillStyle = scale(sum);
context.fillRect(x - a / 2, y - a / 2, a, a);
context.restore();
},
});
};
}, settings);