var game = new Phaser.Game(640, 480, Phaser.CANVAS, 'game');

​

    var PhaserGame = function () {

​

        this.player = null;

        this.platforms = null;

        this.sky = null;

​

        this.facing = 'left';

        this.edgeTimer = 0;

        this.jumpTimer = 0;

​

        this.wasStanding = false;

        this.cursors = null;

​

    };

​

    PhaserGame.prototype = {

​

        init: function () {

​

            this.game.renderer.renderSession.roundPixels = true;

​

            this.world.resize(640, 2000);

​

            this.physics.startSystem(Phaser.Physics.ARCADE);

​

            this.physics.arcade.gravity.y = 750;

            this.physics.arcade.skipQuadTree = false;

​

        },

​

        preload: function () {

​

            //  We need this because the assets are on Amazon S3

            //  Remove the next 2 lines if running locally

            this.load.baseURL = 'http://files.phaser.io.s3.amazonaws.com/codingtips/issue003/';

            this.load.crossOrigin = 'anonymous';

​

            this.load.image('trees', 'assets/trees.png');

            this.load.image('clouds', 'assets/clouds.png');

            this.load.image('platform', 'assets/platform.png');

            this.load.image('ice-platform', 'assets/ice-platform.png');

            this.load.spritesheet('dude', 'assets/dude.png', 32, 48);

​

            //  Note: Graphics are Copyright 2015 Photon Storm Ltd.

​

        },

​

        create: function () {

​

            this.stage.backgroundColor = '#2f9acc';

​

            this.sky = this.add.tileSprite(0, 0, 640, 480, 'clouds');

            this.sky.fixedToCamera = true;

​

            this.add.sprite(0, 1906, 'trees');

​

            this.platforms = this.add.physicsGroup();

​

            var x = 0;

            var y = 64;

​

            for (var i = 0; i < 19; i++)

            {

                var type = i % 2 === 1 ? 'platform' : 'ice-platform';

                var platform = this.platforms.create(x, y, type);

​

                //  Set a random speed between 50 and 200

                platform.body.velocity.x = this.rnd.between(100, 150);

​

                //  Inverse it?

                if (Math.random() > 0.5)

                {

                    platform.body.velocity.x *= -1;

                }

​

                x += 200;

​

                if (x >= 600)

                {

                    x = 0;

                }

​

                y+= 104;

            }

​

            this.platforms.setAll('body.allowGravity', false);

            this.platforms.setAll('body.immovable', true);

​

            this.player = this.add.sprite(320, 1952, 'dude');

​

            this.physics.arcade.enable(this.player);

​

            this.player.body.collideWorldBounds = true;

            this.player.body.setSize(20, 32, 5, 16);

​

            this.player.animations.add('left', [0, 1, 2, 3], 10, true);

            this.player.animations.add('turn', [4], 20, true);

            this.player.animations.add('right', [5, 6, 7, 8], 10, true);

​

            this.camera.follow(this.player);

​

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

​

        },

​

        wrapPlatform: function (platform) {

​

            if (platform.body.velocity.x < 0 && platform.x <= -160)

            {

                platform.x = 640;

            }

            else if (platform.body.velocity.x > 0 && platform.x >= 640)

            {

                platform.x = -160;

            }

        },

​

        setFriction: function (player, platform) {

​

            if (platform.key === 'ice-platform')

            {

                player.body.x -= platform.body.x - platform.body.prev.x;

            }

​

        },

​

        update: function () {

​

            this.sky.tilePosition.y = -(this.camera.y * 0.7);

​

            this.platforms.forEach(this.wrapPlatform, this);

​

            this.physics.arcade.collide(this.player, this.platforms, this.setFriction, null, this);

​

            //  Do this AFTER the collide check, or we won't have blocked/touching set

            var standing = this.player.body.blocked.down || this.player.body.touching.down;

​

            this.player.body.velocity.x = 0;

​

            if (this.cursors.left.isDown)

            {

                this.player.body.velocity.x = -200;

​

                if (this.facing !== 'left')

                {

                    this.player.play('left');

                    this.facing = 'left';

                }

            }

            else if (this.cursors.right.isDown)

            {

                this.player.body.velocity.x = 200;

​

                if (this.facing !== 'right')

                {

                    this.player.play('right');

                    this.facing = 'right';

                }

            }

            else

            {

                if (this.facing !== 'idle')

                {

                    this.player.animations.stop();

​

                    if (this.facing === 'left')

                    {

                        this.player.frame = 0;

                    }

                    else

                    {

                        this.player.frame = 5;

                    }

​

                    this.facing = 'idle';

                }

            }

​

            //  No longer standing on the edge, but were

            //  Give them a 250ms grace period to jump after falling

            if (!standing && this.wasStanding)

            {

                this.edgeTimer = this.time.time + 250;

            }

​

            //  Allowed to jump?

            if ((standing || this.time.time <= this.edgeTimer) && this.cursors.up.isDown && this.time.time > this.jumpTimer)

            {

                this.player.body.velocity.y = -500;

                this.jumpTimer = this.time.time + 750;

            }

​

            this.wasStanding = standing;

​

        }

​

    };

​

    game.state.add('Game', PhaserGame, true);

​