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

   1 'use strict';
   2
   3 /**
   4  * Draws moving gradient boxes
   5  *
   6  * @function GradientsScreen
   7  * @implements IScreen
   8  */
   9 module.exports = function (modulation, width, height, renderer) {
  10
  11   let response = '';
  12
  13   for (let i = 0; i < height; ++i) {
  14     for (let j = 0; j < width; ++j) {
  15       const red = ((modulation + i) * 255 / height) % 255;
  16       const blue = ((modulation + j) * 255 / width) % 255;
  17       const green = ((modulation + i * j) * 255 / (width * height)) % 255;
  18
  19       response = response + renderer(red, blue, green);
  20       response = response + ' ';
  21     }
  22
  23     if (i < height - 1) {
  24       response = response + '\n';
  25     }
  26   }
  27
  28   return response;
  29 };