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

   1 'use strict';
   2
   3 /**
   4  * Draws concentric circles. Each ring has its own color.
   5  *
   6  * @function CircleScreen
   7  * @implements IScreen
   8  */
   9 module.exports = function (modulation, width, height, renderer) {
  10
  11   const response = [];
  12
  13   const circles = width > height ? height : width;
  14
  15   for (let i = 0; i < circles; ++i) {
  16     const centerX = Math.round(width / 2) + 1;
  17     const centerY = Math.round(height / 2) + 1;
  18
  19     const red = Math.floor(Math.random() * 255);
  20     const blue = Math.floor(Math.random() * 255);
  21     const green = Math.floor(Math.random() * 255);
  22
  23     for (let j = 0; j < 180; ++j) {
  24       const angle =  2 * j * (Math.PI / 180);
  25       const x = Math.round(centerX + Math.sin(angle) * i);
  26       const y = Math.round(centerY + Math.cos(angle) * i);
  27
  28       if (x <= width && x > 0 && y <= height && y > 0) {
  29         let position = `\x1B[${y};${x}H`; // Move cursor to y,x (CSI y;x H)
  30         response += `${position}${renderer(red, blue, green)} `;
  31       }
  32     }
  33   }
  34
  35   return response;
  36 };