lib/screens/circle.js


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'use strict';

// Draws concentric circles. Each ring has its own color.
const Circle = function (modulation, width, height, renderer) {
  let response = [];

  let circles = width > height ? height : width;

  for (let i = 0; i < circles; i++) {
    let centerX = Math.round(width / 2) + 1;
    let centerY = Math.round(height / 2) + 1;

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

    for (let j = 0; j < 180; j++) {
      let angle =  2 * j * (Math.PI / 180);
      let x = Math.round(centerX + Math.sin(angle) * i);
      let y = Math.round(centerY + Math.cos(angle) * i);

      if (x <= width && x > 0 && y <= height && y > 0) {
        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 = Circle;