#include "ofApp.h"
#include "math.h"

//--------------------------------------------------------------
void ofApp::setup(){
    beat.loadSound("sounds/DrivingSpaceShipsProdByARZA1990.wav");
    fftSmoothed = new float[8192];
	for (int i = 0; i < 8192; i++){
		fftSmoothed[i] = 0;
	}
	nBandsToGet = 16;
	beat.play();
	ofSetVerticalSync(false);
	ofEnableAlphaBlending();
}

//--------------------------------------------------------------
void ofApp::update(){
    ofSoundUpdate();
    // (5) grab the fft, and put in into a "smoothed" array,
	//		by taking maximums, as peaks and then smoothing downward
	float *val = ofSoundGetSpectrum(nBandsToGet);		// request 128 values for fft
	for (int i = 0;i < nBandsToGet; i++){

		// let the smoothed calue sink to zero:
		fftSmoothed[i] *= 0.96f;

		// take the max, either the smoothed or the incoming:
		if (fftSmoothed[i] < val[i]) fftSmoothed[i] = val[i];

	}
}

//--------------------------------------------------------------
void ofApp::draw()
{

    float   curTimeSecs = ofGetElapsedTimeMicros() / 1000000.0f;

    float   cR = 255.0f,
            cG = 255.0f,
            cB = 255.0f;
    ofBackground(255 - cG, 255 - cB, 255 - cR);
    float circleRadius = ofGetHeight() / 2.0f;
    for(int h=0; h<nBandsToGet; h++)
    {
        ofSetColor(cR, cG, cB);
        ofCircle((h * (ofGetWidth() - (circleRadius * 2.0f))/ nBandsToGet) + circleRadius, (ofGetHeight() / 2.0f), fftSmoothed[h] * circleRadius);
    }
}