hide();
penUp();
drawBackground();
drawAllSeagrass();
drawAllSeaStars();
drawAllFish();
drawAllBubbles();
drawAllSunbeams();

function drawAllSeagrass(){
  for (var i = 0; i < 50; i++) {
    moveTo(randomNumber(0,320),450);
    turnTo(0);
    drawSeagrass(randomNumber(5,20), randomNumber(2, 10));
  }
}

function drawAllSeaStars(){
  for (var i = 0; i < 5; i++) {
    moveTo(randomNumber(0,320), randomNumber(360,450));
    drawSeaStar(randomNumber(10,30));
  }
}

function drawAllFish(){
  for (var i = 0; i < 15; i++) {
    moveTo(randomNumber(0,320),randomNumber(0,300));
    drawFish(randomNumber(5,20),randomNumber(200,255),randomNumber(100,150),120);
  }
}

function drawAllBubbles(){
  for (var i = 0; i < 200; i++) {
    moveTo(randomNumber(0,320),randomNumber(0,450));
    drawBubble(randomNumber(1,5));
  }
}

function drawAllSunbeams(){
  for (var i = 0; i < 100; i++) {
    moveTo(randomNumber(-50,320),0);
    turnTo(randomNumber(165,175));
    drawSunbeam(randomNumber(100,400));
  }
}

function drawBackground(){
  penColor("POwderBlue");
  dot(1000);
}

function drawSeaStar(size){
  penRGB(randomNumber(0, 225),randomNumber(0, 225),randomNumber(0, 225));
  penWidth(10);
  penDown();
  turnTo(0);

  for (var i = 0; i < 5; i++) {
    moveForward(size);
    turnRight(144);
  }
  penUp();
}

function drawSeagrass(radius, numWaves){
  penRGB(0,randomNumber(100,200),0);
  penWidth(3);
  penDown();
  arcLeft(30,radius);
  for(var i = 0; i < numWaves; i++){
    arcRight(60,radius);
    arcLeft(60,radius);
  }
  penUp();
}

function drawFish(size, red, green, blue){
  penRGB(randomNumber(100, 200),randomNumber(0, 100),randomNumber(200, 250));
  penWidth(size);
  penDown();

  dot(size);
  turnTo(90);
  moveForward(size);

  turnLeft(30);
  moveForward(size);
  turnRight(120);
  moveForward(size);
  turnRight(120);
  moveForward(size);
  turnRight(120);

  penUp();
}

function drawBubble(size){
  penRGB(100,100,255,0.2);
  dot(size);
}

function drawSunbeam(size){
  penDown();
  penWidth(randomNumber(1,15));
  penRGB(255,255,255,0.1);
  moveForward(size);
  penUp();
}