​

var x, y;

var prevX, prevY;

​

var fade = true;

​

function setup(){

  //fullScreen();

  createCanvas(300, 900);

  background( 0 );

  stroke( 255 );

​

  x = width/2;

  y = height/2;

​

  prevX = x;

  prevY = y;

​

  stroke(255);

  strokeWeight( 2 );

  point( x, y );

  frameRate(10);

}

​

function draw(){

  var rnd = random (40, 40);

  if (!fade) {

    noStroke();

    fill( 0, 4 );

    rect( 0, 0, width, height );

  }

​

  var angle = (TWO_PI / 10) * floor( random( 10 ));

  x += cos( angle ) * rnd;

  y += sin( angle ) * rnd;

​

  if ( x < 0 || x > width ) {

    x = prevX;

    y = prevY;

  }

​

  if ( y < 0 || y > height) {

    x = prevX;

    y = prevY;

  }

    noFill();

  stroke( 255, 64 );

  strokeWeight( 1 );

  rect( x, y, prevX/4, prevY/8 );

​

  strokeWeight( 3 );

  point( x, y );

​

  prevX = x;

  prevY = y;

}

​

function keyPressed(){

  if (key == 'f') {

    fade = !fade;

  }

  if (key == 't') {

    noLoop();

  }

}

​