git.r.bdr.sh - rbdr/tomato-sauce/blob - lib/screens/mirrors.js

   1 'use strict';
   2
   3 /**
   4  * Draws small moving gradient boxes and repeats them.
   5  *
   6  * @function MirrorsScreen
   7  * @implements IScreen
   8  */
   9 module.exports = function (modulation, width, height, renderer) {
  10
  11   const response = [];
  12
  13   const scale = 2 + Math.round(Math.random() * 4);
  14   const scaledHeight = Math.floor(height / scale);
  15   const scaledWidth = Math.floor(width / scale);
  16
  17   for (let i = 0; i < scaledHeight; ++i) {
  18     const row = [];
  19     for (let j = 0; j < scaledWidth; ++j) {
  20       const red = ((modulation + i) * 255 / height) % 255;
  21       const blue = ((modulation + j) * 255 / width) % 255;
  22       const green = ((modulation + i * j) * 255 / (width * height)) % 255;
  23
  24       const cell = [renderer(red, blue, green), ' '];
  25       row.push(cell.join(''));
  26     }
  27
  28     let rowText = '';
  29     for (let j = 0; j < scale; ++j) {
  30       rowText += row.reverse().join('');
  31     }
  32
  33     for (let j = 1; j < scale; ++j) {
  34       response[j * i] = rowText;
  35       response[(height - 1 - (j * i))] = rowText;
  36     }
  37   }
  38
  39   return response.join('\n');
  40 };