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

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