cn-sensei-guides/03-orange/11-PY-the-sky-is-falling.js

//****************** Scene Object - Initialize When Scene Starts Event*********//
$this.resetShuriken = function () {
    // deactivate and hide the shuriken
    shuriken.active  = false;
    shuriken.visible(false);
    
};

$this.generateCloud = function() {
    // clone the cloud object
    var cloudClone = cloud.clone();
    // position it off the screen
    // with a random x
    cloudClone.x(random(100, 700));
    cloudClone.y(0);
};

$this.throwShuriken = function() {
    // move the shuriken to the ninja
    shuriken.x(ninja.x());
    shuriken.y(ninja.y());
    // activate it and make it visible
    shuriken.active = true;
    shuriken.visible(true);
};

if ($this.scene.state() == "PLAY") {
    // set up score varible
    $this.score = 0; 
    // initialize the shuriken
    $this.resetShuriken();
    // every 3 seconds, generate new cloud
    createTimer(3000, function() {
        $this.generateCloud();
    });
}

//********************* ninja Object - Update Every Frame Event*******************//
$this.incrementAnimation();

// move the ninja left
if (isKeyPressed(Keys.leftArrow)) {
    $this.moveX(-100);
}

// move the ninja right
if (isKeyPressed(Keys.rightArrow)) {
    $this.moveX(100);
}

// if the spacebar is pressed
// and if the shuriken is not active
if (isKeyPressed(Keys.space) && !shuriken.active) {
    $this.scene.throwShuriken();
}

//*********************shuriken Object - Update Every Frame Event*****************//
// move the shuriken if it's active
if ($this.active) {
    $this.moveY();
}

// if it flies off the screen 
// reset it
if ($this.y() <= 0) {
    $this.scene.resetShuriken();
}

//**********************cloud Object - Update Every Frame Event ******************//\
// always move the cloud
$this.moveY();

// remove the cloud if it reaches the top of the screen
if ($this.y() < 0) {
    // increase the score after every cleared cloud
    $this.scene.score += 10;
    scoreLabel.text($this.scene.score);
    $this.remove();
}

// end game if the cloud reaches the bottom of the screen
if (this.y() >= 500) {
    $this.scene.stopCode();
}

// if the cloud touches an active shuriken
if (shuriken.active && $this.isTouching(shuriken)) {
    // push cloud up
    $this.y($this.y() - 200);
    // reset the shuriken
    $this.scene.resetShuriken();
}