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

   1 'use strict';
   2
   3 /**
   4  * Draws random sprinkles in the screen each frame. Same color per
   5  * frame.
   6  *
   7  * @function SprinklesScreen
   8  * @implements IScreen
   9  */
  10 module.exports = function (modulation, width, height, renderer) {
  11
  12   let response = '';
  13
  14   const maxSprinkleCount = (width * height) / 2;
  15   const minSprinkleCount = (width * height) / 8;
  16   const sprinkleCount = Math.round(Math.random() * (maxSprinkleCount - minSprinkleCount)) + minSprinkleCount;
  17
  18   const red = Math.floor(Math.random() * 255);
  19   const blue = Math.floor(Math.random() * 255);
  20   const green = Math.floor(Math.random() * 255);
  21
  22   for (let i = 0; i < sprinkleCount; ++i) {
  23     const x = Math.round(Math.random() * (width - 1)) + 1;
  24     const y = Math.round(Math.random() * (height - 1)) + 1;
  25
  26     const position = `\x1B[${y};${x}H`; // Move cursor to y,x (CSI y;x H)
  27
  28     response += `${position}${renderer(red, blue, green)} `;
  29   }
  30
  31   return response;
  32 };