denet-node-server/node_modules/charm/example/spin.js

var charm = require('../')(process);
charm.reset();

var radius = 10;
var theta = 0;
var points = [];

var iv = setInterval(function () {
    var x = 2 + (radius + Math.cos(theta) * radius) * 2;
    var y = 2 + radius + Math.sin(theta) * radius;
    
    points.unshift([ x, y ]);
    var colors = [ 'red', 'yellow', 'green', 'cyan', 'blue', 'magenta' ];
    
    points.forEach(function (p, i) {
        charm.position(p[0], p[1]);
        var c = colors[Math.floor(i / 12)];
        charm.background(c).write(' ')
    });
    points = points.slice(0, 12 * colors.length - 1);
    
    theta += Math.PI / 40;
}, 50);