Body On A Path

var config = {
    type: Phaser.AUTO,
    width: 800,
    height: 600,
    parent: 'phaser-example',
    physics: {
        default: 'arcade',
        arcade: {
            gravity: { y: 300 },
            debug: false
        }
    },
    scene: {
        preload: preload,
        create: create,
        update: update
    }
};

var player;
var cursors;

var game = new Phaser.Game(config);

function preload ()
{
    this.load.image('sky', 'src/games/firstgame/assets/sky.png');
    this.load.image('ground', 'src/games/firstgame/assets/platform.png');
    this.load.image('star', 'src/games/firstgame/assets/star.png');
    this.load.spritesheet('dude', 'src/games/firstgame/assets/dude.png', { frameWidth: 32, frameHeight: 48 });
}

var FlyingStar = new Phaser.Class({

    Extends: Phaser.Physics.Arcade.Sprite,

    initialize:

    function FlyingStar (scene, x, y, width, height, speed)
    {
        Phaser.Physics.Arcade.Sprite.call(this, scene, x, y, 'star');

        //  This is the path the sprite will follow
        this.path = new Phaser.Curves.Ellipse(x, y, width, height);
        this.pathIndex = 0;
        this.pathSpeed = speed;
        this.pathVector = new Phaser.Math.Vector2();

        this.path.getPoint(0, this.pathVector);

        this.setPosition(this.pathVector.x, this.pathVector.y);
    },

    preUpdate: function (time, delta)
    {
        this.anims.update(time, delta);

        this.path.getPoint(this.pathIndex, this.pathVector);

        this.setPosition(this.pathVector.x, this.pathVector.y);

        this.pathIndex = Phaser.Math.Wrap(this.pathIndex + this.pathSpeed, 0, 1);
    }

});

function create ()
{
    this.add.image(400, 300, 'sky');

    var platforms = this.physics.add.staticGroup();

    platforms.create(400, 568, 'ground').setScale(2).refreshBody();
    platforms.create(600, 400, 'ground');
    platforms.create(50, 250, 'ground');

    player = this.physics.add.sprite(100, 450, 'dude');

    player.setBounce(0.2);
    player.setCollideWorldBounds(true);

    var stars = this.physics.add.group({ allowGravity: false });

    //  x, y = center of the path
    //  width, height = size of the elliptical path
    //  speed = speed the sprite moves along the path per frame

    stars.add(new FlyingStar(this, 150, 100, 100, 100, 0.005), true);
    stars.add(new FlyingStar(this, 500, 200, 40, 100, 0.005), true);
    stars.add(new FlyingStar(this, 600, 200, 40, 100, -0.005), true);
    stars.add(new FlyingStar(this, 700, 200, 40, 100, 0.01), true);

    this.anims.create({
        key: 'left',
        frames: this.anims.generateFrameNumbers('dude', { start: 0, end: 3 }),
        frameRate: 10,
        repeat: -1
    });

    this.anims.create({
        key: 'turn',
        frames: [ { key: 'dude', frame: 4 } ],
        frameRate: 20
    });

    this.anims.create({
        key: 'right',
        frames: this.anims.generateFrameNumbers('dude', { start: 5, end: 8 }),
        frameRate: 10,
        repeat: -1
    });

    cursors = this.input.keyboard.createCursorKeys();

    this.physics.add.collider(player, platforms);

    this.physics.add.overlap(player, stars, collectStar, null, this);
}

function update ()
{
    if (cursors.left.isDown)
    {
        player.setVelocityX(-160);

        player.anims.play('left', true);
    }
    else if (cursors.right.isDown)
    {
        player.setVelocityX(160);

        player.anims.play('right', true);
    }
    else
    {
        player.setVelocityX(0);

        player.anims.play('turn');
    }

    if (cursors.up.isDown && player.body.touching.down)
    {
        player.setVelocityY(-330);
    }
}

function collectStar (player, star)
{
    star.disableBody(true, true);
}
                        

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