app.js

const trianglify = require('trianglify');
const ColorScheme = require('color-scheme');
const Color = require('color');
const path = require('path');
const fs = require('fs');

const scheme = new ColorScheme;

const configPath = path.resolve(process.argv[2]);
if (!configPath) {
	console.log("Must provide a path to config file");
	console.log("See README.md");
	process.exit(1);
}

const config = JSON.parse(fs.readFileSync(configPath));

const baseHex = config.baseColor;
const width = config.width
const height = config.height

const hue = Math.floor(Math.random() * 360)
const lightColors = scheme.from_hex(baseHex)
	.scheme('mono')
	.variation('soft')
	.colors().slice(1);

const darkColors = lightColors.map(color => {
	return Color(`#${color}`).darken(config.darkenAmount).hex()
});

const base = trianglify({
	width: width,
	height: height,
	cellSize: config.cellSize,
	variance: config.variance,
	seed: null,
	fill: false,
	colorSpace: 'lab',
	strokeWidth: 0,
	points: null
});

const dark = trianglify({
	width: width,
	height: height,
	xColors: darkColors,
	fill: true,
	colorSpace: 'lab',
	colorFunction: trianglify.colorFunctions.sparkle(config.intensity),
	strokeWidth: 0,
	points: base.points
});

const light = trianglify({
	width: width,
	height: height,
	xColors: lightColors,
	fill: true,
	colorSpace: 'lab',
	colorFunction: trianglify.colorFunctions.sparkle(config.intensity),
	strokeWidth: 0,
	points: base.points
});

const outputDIR = config.path || path.join(__dirname, 'output')

fs.mkdir(outputDIR, (err) => {
	if (err && err.code != "EEXIST") {
		console.log("Unable to create DIR");
		console.error(err);
		process.exit(1);
	}
});

const darkCanvas = dark.toCanvas()
const darkFile = fs.createWriteStream(`${outputDIR}/dark.png`)
darkCanvas.createPNGStream().pipe(darkFile)

const lightCanvas = light.toCanvas()
const lightFile = fs.createWriteStream(`${outputDIR}/light.png`)
lightCanvas.createPNGStream().pipe(lightFile)