return String.fromCharCode(

      0x30A0 + round(random(0,96)) //all but 77

    );

}

​

class Matrix{

  constructor(x1,y1,x2,y2){

    this.chains = [];

    this.symbolSize = 20;

    this.x1 = x1;

    this.y1 = y1; 

    this.x2 = x2;

    this.y2 = y2;

    for(let i = this.x1; i < this.x1+this.x2; i+= this.symbolSize){

      if(round(random(1,5)) != 1){

        append(this.chains, new Chain(i,this.y1,this.y2,this.symbolSize));

      }

    }

  }

  run(){

    stroke(180);

    fill(0,90);

    rect(this.x1,this.y1,this.x2,this.y2);

    for(let c of this.chains){

      c.render();

    }

  }

}

​

class Character{

  constructor(x,y,s,f,symbolSize,y1,y2){

    this.pos = createVector(x,y);

    this.size = symbolSize;

    this.speed = s;

    this.interval = round(random(2,7));

    this.first = f;

    this.y1 = y1;

    this.y2 = y2;

    this.symbolSize = symbolSize;

    //clean up

    this.symbol = getSymbol();

  }

  update(){

    if(this.pos.y <= this.y1+this.y2-2){

      this.pos.y += this.speed;

    }else{

      this.pos.y = this.y1+18;

    }

    if(frameCount %  this.interval == 0){

      this.symbol = getSymbol();

    }

  }

  render(){

    if(this.pos.y > this.y1){

      noStroke();

      if(this.first){

        fill(180,255,180);

      }else{

        fill(0,255,70);

      }

      textSize(this.size);

      text(this.symbol,this.pos.x,this.pos.y)

    }

  }

}

​

class Chain{

  constructor(x,y1,y2,symbolSize){

    this.size = round(random(5,10));

    this.pos = createVector(x,random(y1+this.size*symbolSize,y2));

    this.speed = random(2,3);

    this.symbols = [];

    let first = false;

    for(let i = 0; i <= this.size; i++){

      if(i == 0 && round(random(1,3)) == 1){

        first = true;

      }else{

        first = false;

      }

      append(this.symbols,new Character(

        this.pos.x,

        this.pos.y-i*symbolSize,

        this.speed,

        first,symbolSize,y1,y2

      ));

    }

  }

  render(){

    for(let s of this.symbols){

      s.update();

      s.render();

    }

  }

}