[rbdr/tomato-sauce] / lib / screens / sprinkles.js

'use strict';

/**
 * Draws random sprinkles in the screen each frame. Same color per
 * frame.
 *
 * @function SprinklesScreen
 * @implements IScreen
 */
module.exports = function (modulation, width, height, renderer) {

  let response = '';

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

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

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

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

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

  return response;
};