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

'use strict';

/**
 * Draws moving gradient boxes
 *
 * @function GradientsScreen
 * @implements IScreen
 */
module.exports = function (modulation, width, height, renderer) {

  let response = '';

  for (let i = 0; i < height; ++i) {
    for (let j = 0; j < width; ++j) {
      const red = ((modulation + i) * 255 / height) % 255;
      const blue = ((modulation + j) * 255 / width) % 255;
      const green = ((modulation + i * j) * 255 / (width * height)) % 255;

      response = response + renderer(red, blue, green);
      response = response + ' ';
    }

    if (i < height - 1) {
      response = response + '\n';
    }
  }

  return response;
};