lib/screens/sprinkles.js


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'use strict';

// Places random sprinkles in the screen each frame. Same color per
// frame.
const Sprinkles = function (modulation, width, height, renderer) {
  let response = '';

  let maxSprinkleCount = (width * height) / 2;
  let minSprinkleCount = (width * height) / 8;
  let sprinkleCount = Math.round(Math.random() * (maxSprinkleCount - minSprinkleCount)) + minSprinkleCount;

  let red = Math.floor(Math.random() * 255);
  let blue = Math.floor(Math.random() * 255);
  let green = Math.floor(Math.random() * 255);

  for (let i = 0; i < sprinkleCount; i++) {
    let x = Math.round(Math.random() * (width - 1)) + 1;
    let y = Math.round(Math.random() * (height - 1)) + 1;

    let position = `\x1B[${y};${x}H`; // Move cursor to y,x (CSI y;x H)

    response += `${position}${renderer(red, blue, green)} `;
  }

  return response;
};

module.exports = Sprinkles;