hiromorozumi

// use pixels for ruler units
var defaultRulerUnits = preferences.rulerUnits
preferences.rulerUnits = Units.PIXELS;

// get desired inputs from user
var spokeRadius		= Number(prompt("Spoke radius (in pixels)?", 100));
var colorCode		= parseInt("0x" + prompt("Stroke color (in hex, rrggbb)?", "a0a0a0"));
var strokeWidth		= Number(prompt("Stroke width?", 2));
var nPoints		= Number(prompt("How many spokes to draw?", 20));

hiromorozumi

#include <iomanip>
#include <iostream>

#define     EXP_TABLE_LEN       100

using namespace std;

//
// populates an array of doubles with values ranging from 1.0 to 0
// derived from an exponential decay curve

hiromorozumi

//
//  Frequency estimation using Barry Quinn's Second Estimator
//  Adapted from following links:
//  DSP Guru site:
//  http://dspguru.com/dsp/howtos/how-to-interpolate-fft-peak
//  Vadym Markov's adaptation:
//  https://github.com/vadymmarkov/Beethoven/blob/master/Source/Estimation/Strategies/QuinnsSecondEstimator.swift
//
//  sampleRate ... your audio sample rate
//  k          ... bin index that shows biggest FFT output magnitude