82 lines
2.0 KiB
JavaScript
82 lines
2.0 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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function rgb_to_int(r, g, b) {
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return ((r << 8) + g) << 8 + b;
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}
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function int_to_rgb(int) {
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var r = int >> 16 & 0xFF;
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var g = int >> 8 & 0xFF;
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var b = int & 0xFF;
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return { r: r, g: g, b: b };
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}
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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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for (let i = 0; i < cfg.leds; i++) {
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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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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(500);
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}
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function fade(index) {
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var original = int_to_rgb(pixel_cache[index]);
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var current = int_to_rgb(pixels[index]);
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var final = int_to_rgb(next_pattern[index]);
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var diff_r = final.r - original.r;
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var diff_g = final.g - original.g;
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var diff_b = final.b - original.b;
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var interval_r = diff_r / fade_ticks;
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var interval_g = diff_g / fade_ticks;
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var interval_b = diff_b / fade_ticks;
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if (Math.abs(final.r - current.r) < interval_r &&
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Math.abs(final.g - current.g) < interval_g &&
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Math.abs(final.b - current.b) < interval_b
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) {
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pixels[index] = next_pattern[index];
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pixel_cache[index] = next_pattern[index];
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}
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else {
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pixels[index] = rgb_to_int(current.r + interval_r,
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current.g + interval_g,
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current.b + interval_b);
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}
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} |