62 lines
1.3 KiB
JavaScript
62 lines
1.3 KiB
JavaScript
import ws281x from 'rpi-ws281x'
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import * as fs from 'fs'
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const cfg = JSON.parse(fs.readFileSync('./config.json'));
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const fade_ticks = cfg.fade_ticks || 10;
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var pixels = new Uint32Array(cfg.leds);
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var pixel_cache = new Uint32Array(cfg.leds);
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var next_pattern = new Uint32Array(cfg.leds);
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var pattern = {}
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ws281x.configure({
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leds: cfg.leds || 300,
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brightness: cfg.brightness || 200,
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gpio: cfg.gpio || 18,
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stripType: cfg.type || 'grb'
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});
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export function set_pattern(pat) {
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pattern = pat
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}
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function tick_pattern() {
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// do the parsing stuff here
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var r = Math.floor(Math.random() * 100)
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var g = Math.floor(Math.random() * 100);
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var b = Math.floor(Math.random() * 100);
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for (let i = 0; i < cfg.leds; i++) {
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next_pattern[i] = ((r << 8) + g) << 8 + b;
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}
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}
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export function tick() {
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var changed = false;
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for (let i = 0; i < cfg.leds; i++) {
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if (next_pattern[i] != pixels[i]) {
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changed = true;
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fade(i);
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}
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}
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if (!changed) {
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tick_pattern();
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}
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ws281x.render(pixels);
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ws281x.sleep(10);
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}
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function fade(index) {
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var original = pixel_cache[index];
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var final = next_pattern[index];
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var diff = final - original;
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var interval = diff / fade_ticks;
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if (Math.abs(final - pixels[index]) < interval) {
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pixels[index] = final;
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pixel_cache[index] = final;
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}
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else {
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pixels[index] += interval;
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}
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} |