particleClass.js

var Particella = function(x, y, radius, col) {
  this.dx = 0;
  this.dy = 0;
  this.dradius = 0;
  this.rifx = 0;
  this.rify = 0;
  this.vel = 30;
  this.vibracounter = 0;
  this.x = x;
  this.y = y;
  this.radius = radius;
  this.radius2 = radius*2;
  this.col = col;
  this.state = 0;
};

Particella.prototype = {
  setRif: function(x, y) {
    this.rifx = x;
    this.rify = y;
  },
  draw: function() {
    c.fillStyle = this.col;
    c.beginPath();
    c.arc(this.x,this.y,this.radius,0,2*Math.PI,true);
    c.fill();
  },
  update: function() {
    if(Math.abs(mouseX-this.x)<20 && Math.abs(mouseY-this.y)<20) {
      if(this.state==0) {
        this.state = 1;
        this.dx = this.rifx+Math.random()*200-100;
        this.dy = Math.random()*hc;
        this.vel = 30;
      } else if(this.state==1) {
        this.vibracounter = Math.round(Math.random()*20+10);
      }
    }
    switch(this.state) {
      case 0:
      this.vibraLinea();
      break;
      case 1:
      this.vibraTutto();
      break;
    }
    this.x += (this.dx-this.x)/this.vel;
    this.y += (this.dy-this.y)/this.vel;
  },
  vibraLinea: function() {
    if(this.vibracounter==0) {
      this.vel = 20;
      this.dx = this.rifx+Math.random()*20-10;
      this.dy = this.rify+Math.random()*20-10;
      this.vibracounter = Math.round(Math.random()*5+5);
    }
    this.vibracounter--;
  },
  vibraTutto: function() {
    if(Math.abs(this.dx-this.x)<5 && Math.abs(this.dy-this.y)<5){
      this.state = 0;
      return;
    }
  }
};