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

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