Phaser game using Classes

Phaser 3
1

Hello I am trying to build phaser using another approach and I got an error. can you check it out for me please.

import 'phaser';

class MyGame extends Phaser.Scene
{
    constructor ()
    {
        super();
    }

    preload () {
        this.load.image('sky', require('./assets/sky.png'));
        this.load.image('ground', require('./assets/platform.png'));
        this.load.image('star', require('./assets/star.png'));
        this.load.image('bomb', require('./assets/bomb.png'));
        this.load.spritesheet('dude',
        require('./assets/dude.png'),
          { frameWidth: 32, frameHeight: 48 });
      }
      
    create ()
    {
       
        this.add.image(400, 300, 'sky');
        const platforms = this.physics.add.staticGroup();

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

        platforms.create(600, 400, 'ground');
        platforms.create(50, 250, 'ground');
        platforms.create(750, 220, 'ground');

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

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

        player.body.setGravityY(300);
        this.cursors = this.input.keyboard.createCursorKeys();
        this.physics.add.collider(player, platforms);
    }

    update () {

        var cursors = this.cursors;
        var player = this.player;

        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);
        }
    }
}

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

const game = new Phaser.Game(config);

I get an error that body and setVelocityX() are undefined.

2

In create you use const player = this.physics.add.sprite(100, 450, ‘dude’);
So this.player doesn’t exists…
Try with:
this.player = this.physics.add.sprite(100, 450, ‘dude’)
and everywhere replace player with this.player

3

Thank you very much it worked.

4

I am facing another problem: My score reads NaN.
Please help me locate the problem.

import 'phaser';

class MyGame extends Phaser.Scene
{
    constructor ()
    {
        super();
    }

    preload () {
        this.load.image('sky', require('./assets/sky.png'));
        this.load.image('ground', require('./assets/platform.png'));
        this.load.image('star', require('./assets/star.png'));
        this.load.image('bomb', require('./assets/bomb.png'));
        this.load.spritesheet('dude',
        require('./assets/dude.png'),
          { frameWidth: 32, frameHeight: 48 });
      }
      
    create ()
    {
       
        this.add.image(400, 300, 'sky');
        const platforms = this.physics.add.staticGroup();

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

        platforms.create(600, 400, 'ground');
        platforms.create(50, 250, 'ground');
        platforms.create(750, 220, 'ground');

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

        this.player.setBounce(0.2);
        this.player.setCollideWorldBounds(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
        });

        this.stars = this.physics.add.group({
            key: 'star',
            repeat: 11,
            setXY: { x: 12, y: 0, stepX: 70 }
        });
        
        this.stars.children.iterate(function (child) {
        
            child.setBounceY(Phaser.Math.FloatBetween(0.4, 0.8));
        
        });

        this.player.body.setGravityY(300);
        this.cursors = this.input.keyboard.createCursorKeys();
        this.physics.add.collider(this.stars, platforms);
        this.physics.add.collider(this.player, platforms);

        this.physics.add.overlap(this.player, this.stars, this.collectStar, null, this);
        this.scoreText = this.add.text(16, 16, 'score: 0', { fontSize: '32px', fill: '#000' });
    }

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

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

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

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

        if (this.cursors.up.isDown && this.player.body.touching.down)
        {
            this.player.setVelocityY(-500);
        }
    }

    collectStar (player, star)
    {
        star.disableBody(true, true);
        this.score += 10;
        this.scoreText.setText('Score: ' + this.score);
    }
}

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

const game = new Phaser.Game(config);
5

Because this.score is never initialized.
In create, add this.score = 0;

I suggest you to read about es6 classes, this will help you.