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

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