demo-class15.pde

int x = 200;
int speed;

void setup() {
  size(400, 800);
  float r = random(2, 5);
  speed = int(r);
  noStroke();
}

void draw() {
  drawSky();
  drawBall();
}

void drawSky() {
  int size = 100;
  for (int i = 0; i < height; i = i + size) {
    float b = map(i, 0, height, 0, 150);
    fill(0, 0, b);
    rect(0, i, width, size);
    println(i);
  }
}

void drawBall() {
  fill(255);
  ellipse(x, 200, 20, 20);
  x = x + speed;
  if (x > width) {
    x = 0;
  }
}