PVector mouse, centre;

void setup(){
 size(500, 500);
 
 centre = new PVector(width/2, height/2);
 mouse = new PVector(0, 0);
}

void draw(){
 
 background(0);
 fill(255);
 ellipse(width/2, height/2, 250, 250);
 fill(0);
 ellipse(width/2, height/2, 200, 200);
 mouse.x = mouseX;
 mouse.y = mouseY;
 float distance = mouse.dist(centre);
 println("Mouse is "+distance+" from centre");
 
 
}

AudioThread audioThread;

float[] wt;
float phase;
float dPhase;
float amplitude;

void setup() {
 size(500,400, P2D);
 // fill up a wavetable (am array)
 // with a single cycle of the sin function
 wt = new float[44100];
 int N = wt.length;
 for (int n = 0; n < N; n++){
 wt[n] += sin(TWO_PI / (float) N * (float) n);
 }
 // phase dictates where we are in teh wavetable 
 phase = 0;
 amplitude = 0;
 // dphase dictaes how much we move by each time we read
 // a value from the eavetable 
 dPhase = 200;
 
// Create the AudioThread object, which will connect to the audio 
// interface and get it ready to use
 audioThread = new AudioThread();
// Start the audioThread, which will cause it to continually call 'getAudioOut' (see below)
 audioThread.start();
}
 
void draw() {
 background(255);
 fill(0);
 
 if (mousePressed){
 amplitude = 0;
 }
 else {
 amplitude = 1;
 }
 
 
}

// this function gets called when you press the escape key in the sketch
void stop(){
 // tell the audio to stop
 audioThread.quit();
 // call the version of stop defined in our parent class, in case it does anything vital
 super.stop();
}

// this gets called by the audio thread when it wants some audio
// we should fill the sent buffer with the audio we want to send to the 
// audio output
void generateAudioOut(float[] buffer){
 for (int i=0;i<buffer.length; i++){
 // write the value from the wavetable into 
 // the buffer so it can be sent to the soundcard.
 buffer[i] = wt[(int)phase] * amplitude;
 // increase the phase, using modulo
 // to wrap it back round to zero so 
 // we don't go out of the bounds of the wt array.
 phase = (phase + dPhase) % wt.length;
 
 }
}