Make particles synchronize with sound

edited April 2017 in Library Questions

Hello there. I'm trying make the rain particles fall synchronized with the sound using the minim library, but I know nothing about this and I have no idea how to make this happen. If someone could explain me how to do it, it would be great. This is what I have right now. Thank you and sorry for the slightly dumb question!

import ddf.minim.*;

Minim minim;
AudioPlayer player;
int numero = 200; // how many rain drops on your screen??
Rain[] rains = new Rain[numero]; 

void setup()
  size(512, 200, P3D);
  for(int i=0; i<numero ;i=i+1){
     rains[i]=new Rain(); 
  // we pass this to Minim so that it can load files from the data directory
  minim = new Minim(this);

  // loadFile will look in all the same places as loadImage does.
  // this means you can find files that are in the data folder and the 
  // sketch folder. you can also pass an absolute path, or a URL.
  player = minim.loadFile("sound.mp3");

  // play the file from start to finish.
  // if you want to play the file again, 
  // you need to call rewind() first.;

void draw()
  for(int i=0 ; i<numero ; i=i+1){
  // draw the waveforms
  // the values returned by left.get() and right.get() will be between -1 and 1,
  // so we need to scale them up to see the waveform
  // note that if the file is MONO, left.get() and right.get() will return the same value
  for(int i = 0; i < player.bufferSize() - 1; i++)
    float x1 = map( i, 0, player.bufferSize(), 0, width );
    float x2 = map( i+1, 0, player.bufferSize(), 0, width );
   line( x1, 50 + player.left.get(i)*50, x2, 50 + player.left.get(i+1)*50 );
    line( x1, 150 + player.right.get(i)*50, x2, 150 + player.right.get(i+1)*50 );
class Rain {  //this class setups the shape and movement of raindrop.
 float x = random(0,600);
 float y = random(-1000,0);
 float size = random(3,7); // size of raindrop 
 float speed = random(20,80); // speed range
  void update() 
    y += speed; 
    ellipse(x, y-20, size, size*6); // tail of raindrop
    ellipse(x, y, size, size*6); //head of raindrop 

    if (y> height) //initialize raindrop which arrives bottom.
       x = random(0,600);
       y = random(-1200,0);



  • minim will either give you a number for each point on the waveform of a sound (lines 41 to 47) OR, using fft, a number representing the frequencies within that sound. so, hundreds of numbers or twenty(ish) numbers.

    it's up to you what you use those numbers for. you need to decide.

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