In this example we will create a radial audio wave by substituting the (x,y) values with the points on a circle:
x = radius * cos(theta);
y = radius * sin(theta)
x = (sound sample * multiplier + radius) * cos( angle interval * loop counter);
y = (sound sample * multiplier + radius) * sin( angle interval * loop counter);
import ddf.minim.*; import controlP5.*; //declaration of minim object Minim minim; //audio input variable AudioInput sound; //declaration of ControlP5 object ControlP5 cp5; //sound amplitude multiplier float amplitude = 150; //size of radial wave float radius = 20; void setup() { size(1000, 500); minim = new Minim(this); sound = minim.getLineIn(Minim.STEREO, 1024); cp5 = new ControlP5(this); cp5.addSlider("amplitude") .setPosition(40,40) .setRange(0,1200) .setSize(200,20) .setValue(400) .setColorForeground(color(20,200,200)) .setColorLabel(color(255)) .setColorBackground(color(70,70,70)) .setColorValue(color(0,0,0)) .setColorActive(color(0,255,255)) ; cp5.addSlider("radius") .setPosition(40,80) .setRange(0,200) .setSize(200,20) .setValue(50) .setColorForeground(color(20,200,200)) .setColorLabel(color(255)) .setColorBackground(color(70,70,70)) .setColorValue(color(0,0,0)) .setColorActive(color(0,255,255)) ; } void draw() { background(0); stroke(255); //creare a radian step size for angle interval based on 1024 sound samples float radians_step = 2*PI/sound.bufferSize(); for(int i = 0; i < sound.bufferSize()-1; i++){ ////calculate positions to create a line based on a circle float xpos1 = width/2 + (sound.mix.get(i)*amplitude+radius) * cos(i*radians_step); float ypos1 = height/2 + (sound.mix.get(i)*amplitude+radius) * sin(i*radians_step); float xpos2 = width/2 + (sound.mix.get(i)*amplitude+radius) * cos((i+1)*radians_step); float ypos2 = height/2 + (sound.mix.get(i)*amplitude+radius) * sin((i+1)*radians_step); line( xpos1,ypos1,xpos2,ypos2); } }