float x, y, d;
float t_x = 10, t_y = 20, t_r=30, t_g=40, t_b=50, t_a=60;

void setup() {
  fullScreen();
  stroke(0, 100);
  background(0);
  noCursor();
}

void draw() {
  if (d>1) {
    float r = noise(t_r) * 255;
    float g = noise(t_g) * 100;
    float b = noise(t_b) * 100;
    float a = noise(t_a) * 50;

    fill(r, g, b, a);
    ellipse(x, y, d, d);

    t_x += 0.005;
    t_y += 0.005;
    t_r += 0.01;
    t_g += 0.005;
    t_b += 0.005;
    t_a += 0.0001;

    x += noise(t_x) * 10 - 5;
    y += noise(t_y) * 10 - 5;
    d -= 0.5;
  }
  else {
    x = random(width);
    y = height/2;
    d = random(50, 200);
  }
}

//void mousePressed() {
//  if (d<1) {
//    d = random(50, 200);
//    x = mouseX;
//    y = mouseY;
//  }
//}

void keyPressed() {
  if (d<1 && key==' ')
    background(0);
}