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<html>
<head>
<meta name="description" content="Bullet Hell" />
<title>Phaser Coding Tips Issue 7</title>
<meta charset="utf-8">
<script src="//cdn.jsdelivr.net/phaser/2.2.2/phaser.min.js"></script>
</head>
<body>
<div id="game"></div>
<a href="https://phaser.io"><img src="https://files.phaser.io.s3.amazonaws.com/codingtips/issue007/phaser-tips-header1.png" title="Phaser Coding Tips Weekly" style="margin-top: 8px" /></a>
<script>
var game = new Phaser.Game(640, 400, Phaser.AUTO, 'game');
// Our core Bullet class
// This is a simple Sprite object that we set a few properties on
// It is fired by all of the Weapon classes
var Bullet = function (game, key) {
Phaser.Sprite.call(this, game, 0, 0, key);
this.texture.baseTexture.scaleMode = PIXI.scaleModes.NEAREST;
this.anchor.set(0.5);
this.checkWorldBounds = true;
this.outOfBoundsKill = true;
this.exists = false;
this.tracking = false;
this.scaleSpeed = 0;
};
Bullet.prototype = Object.create(Phaser.Sprite.prototype);
Bullet.prototype.constructor = Bullet;
Bullet.prototype.fire = function (x, y, angle, speed, gx, gy) {
gx = gx || 0;
gy = gy || 0;
this.reset(x, y);
this.scale.set(1);
this.game.physics.arcade.velocityFromAngle(angle, speed, this.body.velocity);
this.angle = angle;
this.body.gravity.set(gx, gy);
};
Bullet.prototype.update = function () {
if (this.tracking)
{
this.rotation = Math.atan2(this.body.velocity.y, this.body.velocity.x);
}
if (this.scaleSpeed > 0)
{
this.scale.x += this.scaleSpeed;
this.scale.y += this.scaleSpeed;
}
};
var Weapon = {};
////////////////////////////////////////////////////
// A single bullet is fired in front of the ship //
////////////////////////////////////////////////////
Weapon.SingleBullet = function (game) {
Phaser.Group.call(this, game, game.world, 'Single Bullet', false, true, Phaser.Physics.ARCADE);
this.nextFire = 0;
this.bulletSpeed = 600;
this.fireRate = 100;
for (var i = 0; i < 64; i++)
{
this.add(new Bullet(game, 'bullet5'), true);
}
return this;
};
Weapon.SingleBullet.prototype = Object.create(Phaser.Group.prototype);
Weapon.SingleBullet.prototype.constructor = Weapon.SingleBullet;
Weapon.SingleBullet.prototype.fire = function (source) {
if (this.game.time.time < this.nextFire) { return; }
var x = source.x + 10;
var y = source.y + 10;
this.getFirstExists(false).fire(x, y, 0, this.bulletSpeed, 0, 0);
this.nextFire = this.game.time.time + this.fireRate;
};
/////////////////////////////////////////////////////////
// A bullet is shot both in front and behind the ship //
/////////////////////////////////////////////////////////
Weapon.FrontAndBack = function (game) {
Phaser.Group.call(this, game, game.world, 'Front And Back', false, true, Phaser.Physics.ARCADE);
this.nextFire = 0;
this.bulletSpeed = 600;
this.fireRate = 100;
for (var i = 0; i < 64; i++)
{
this.add(new Bullet(game, 'bullet5'), true);
}
return this;
};
Weapon.FrontAndBack.prototype = Object.create(Phaser.Group.prototype);
Weapon.FrontAndBack.prototype.constructor = Weapon.FrontAndBack;
Weapon.FrontAndBack.prototype.fire = function (source) {
if (this.game.time.time < this.nextFire) { return; }
var x = source.x + 10;
var y = source.y + 10;
this.getFirstExists(false).fire(x, y, 0, this.bulletSpeed, 0, 0);
this.getFirstExists(false).fire(x, y, 180, this.bulletSpeed, 0, 0);
this.nextFire = this.game.time.time + this.fireRate;
};
//////////////////////////////////////////////////////
// 3-way Fire (directly above, below and in front) //
//////////////////////////////////////////////////////
Weapon.ThreeWay = function (game) {
Phaser.Group.call(this, game, game.world, 'Three Way', false, true, Phaser.Physics.ARCADE);
this.nextFire = 0;
this.bulletSpeed = 600;
this.fireRate = 100;
for (var i = 0; i < 96; i++)
{
this.add(new Bullet(game, 'bullet7'), true);
}
return this;
};
Weapon.ThreeWay.prototype = Object.create(Phaser.Group.prototype);
Weapon.ThreeWay.prototype.constructor = Weapon.ThreeWay;
Weapon.ThreeWay.prototype.fire = function (source) {
if (this.game.time.time < this.nextFire) { return; }
var x = source.x + 10;
var y = source.y + 10;
this.getFirstExists(false).fire(x, y, 270, this.bulletSpeed, 0, 0);
this.getFirstExists(false).fire(x, y, 0, this.bulletSpeed, 0, 0);
this.getFirstExists(false).fire(x, y, 90, this.bulletSpeed, 0, 0);
this.nextFire = this.game.time.time + this.fireRate;
};
/////////////////////////////////////////////
// 8-way fire, from all sides of the ship //
/////////////////////////////////////////////
Weapon.EightWay = function (game) {
Phaser.Group.call(this, game, game.world, 'Eight Way', false, true, Phaser.Physics.ARCADE);
this.nextFire = 0;
this.bulletSpeed = 600;
this.fireRate = 100;
for (var i = 0; i < 96; i++)
{
this.add(new Bullet(game, 'bullet5'), true);
}
return this;
};
Weapon.EightWay.prototype = Object.create(Phaser.Group.prototype);
Weapon.EightWay.prototype.constructor = Weapon.EightWay;
Weapon.EightWay.prototype.fire = function (source) {
if (this.game.time.time < this.nextFire) { return; }
var x = source.x + 16;
var y = source.y + 10;
this.getFirstExists(false).fire(x, y, 0, this.bulletSpeed, 0, 0);
this.getFirstExists(false).fire(x, y, 45, this.bulletSpeed, 0, 0);
this.getFirstExists(false).fire(x, y, 90, this.bulletSpeed, 0, 0);
this.getFirstExists(false).fire(x, y, 135, this.bulletSpeed, 0, 0);
this.getFirstExists(false).fire(x, y, 180, this.bulletSpeed, 0, 0);
this.getFirstExists(false).fire(x, y, 225, this.bulletSpeed, 0, 0);
this.getFirstExists(false).fire(x, y, 270, this.bulletSpeed, 0, 0);
this.getFirstExists(false).fire(x, y, 315, this.bulletSpeed, 0, 0);
this.nextFire = this.game.time.time + this.fireRate;
};
////////////////////////////////////////////////////
// Bullets are fired out scattered on the y axis //
////////////////////////////////////////////////////
Weapon.ScatterShot = function (game) {
Phaser.Group.call(this, game, game.world, 'Scatter Shot', false, true, Phaser.Physics.ARCADE);
this.nextFire = 0;
this.bulletSpeed = 600;
this.fireRate = 40;
for (var i = 0; i < 32; i++)
{
this.add(new Bullet(game, 'bullet5'), true);
}
return this;
};
Weapon.ScatterShot.prototype = Object.create(Phaser.Group.prototype);
Weapon.ScatterShot.prototype.constructor = Weapon.ScatterShot;
Weapon.ScatterShot.prototype.fire = function (source) {
if (this.game.time.time < this.nextFire) { return; }
var x = source.x + 16;
var y = (source.y + source.height / 2) + this.game.rnd.between(-10, 10);
this.getFirstExists(false).fire(x, y, 0, this.bulletSpeed, 0, 0);
this.nextFire = this.game.time.time + this.fireRate;
};
//////////////////////////////////////////////////////////////////////////
// Fires a streaming beam of lazers, very fast, in front of the player //
//////////////////////////////////////////////////////////////////////////
Weapon.Beam = function (game) {
Phaser.Group.call(this, game, game.world, 'Beam', false, true, Phaser.Physics.ARCADE);
this.nextFire = 0;
this.bulletSpeed = 1000;
this.fireRate = 45;
for (var i = 0; i < 64; i++)
{
this.add(new Bullet(game, 'bullet11'), true);
}
return this;
};
Weapon.Beam.prototype = Object.create(Phaser.Group.prototype);
Weapon.Beam.prototype.constructor = Weapon.Beam;
Weapon.Beam.prototype.fire = function (source) {
if (this.game.time.time < this.nextFire) { return; }
var x = source.x + 40;
var y = source.y + 10;
this.getFirstExists(false).fire(x, y, 0, this.bulletSpeed, 0, 0);
this.nextFire = this.game.time.time + this.fireRate;
};
///////////////////////////////////////////////////////////////////////
// A three-way fire where the top and bottom bullets bend on a path //
///////////////////////////////////////////////////////////////////////
Weapon.SplitShot = function (game) {
Phaser.Group.call(this, game, game.world, 'Split Shot', false, true, Phaser.Physics.ARCADE);
this.nextFire = 0;
this.bulletSpeed = 700;
this.fireRate = 40;
for (var i = 0; i < 64; i++)
{
this.add(new Bullet(game, 'bullet8'), true);
}
return this;
};
Weapon.SplitShot.prototype = Object.create(Phaser.Group.prototype);
Weapon.SplitShot.prototype.constructor = Weapon.SplitShot;
Weapon.SplitShot.prototype.fire = function (source) {
if (this.game.time.time < this.nextFire) { return; }
var x = source.x + 20;
var y = source.y + 10;
this.getFirstExists(false).fire(x, y, 0, this.bulletSpeed, 0, -500);
this.getFirstExists(false).fire(x, y, 0, this.bulletSpeed, 0, 0);
this.getFirstExists(false).fire(x, y, 0, this.bulletSpeed, 0, 500);
this.nextFire = this.game.time.time + this.fireRate;
};
///////////////////////////////////////////////////////////////////////
// Bullets have Gravity.y set on a repeating pre-calculated pattern //
///////////////////////////////////////////////////////////////////////
Weapon.Pattern = function (game) {
Phaser.Group.call(this, game, game.world, 'Pattern', false, true, Phaser.Physics.ARCADE);
this.nextFire = 0;
this.bulletSpeed = 600;
this.fireRate = 40;
this.pattern = Phaser.ArrayUtils.numberArrayStep(-800, 800, 200);
this.pattern = this.pattern.concat(Phaser.ArrayUtils.numberArrayStep(800, -800, -200));
this.patternIndex = 0;
for (var i = 0; i < 64; i++)
{
this.add(new Bullet(game, 'bullet4'), true);
}
return this;
};
Weapon.Pattern.prototype = Object.create(Phaser.Group.prototype);
Weapon.Pattern.prototype.constructor = Weapon.Pattern;
Weapon.Pattern.prototype.fire = function (source) {
if (this.game.time.time < this.nextFire) { return; }
var x = source.x + 20;
var y = source.y + 10;
this.getFirstExists(false).fire(x, y, 0, this.bulletSpeed, 0, this.pattern[this.patternIndex]);
this.patternIndex++;
if (this.patternIndex === this.pattern.length)
{
this.patternIndex = 0;
}
this.nextFire = this.game.time.time + this.fireRate;
};
///////////////////////////////////////////////////////////////////
// Rockets that visually track the direction they're heading in //
///////////////////////////////////////////////////////////////////
Weapon.Rockets = function (game) {
Phaser.Group.call(this, game, game.world, 'Rockets', false, true, Phaser.Physics.ARCADE);
this.nextFire = 0;
this.bulletSpeed = 400;
this.fireRate = 250;
for (var i = 0; i < 32; i++)
{
this.add(new Bullet(game, 'bullet10'), true);
}
this.setAll('tracking', true);
return this;
};
Weapon.Rockets.prototype = Object.create(Phaser.Group.prototype);
Weapon.Rockets.prototype.constructor = Weapon.Rockets;
Weapon.Rockets.prototype.fire = function (source) {
if (this.game.time.time < this.nextFire) { return; }
var x = source.x + 10;
var y = source.y + 10;
this.getFirstExists(false).fire(x, y, 0, this.bulletSpeed, 0, -700);
this.getFirstExists(false).fire(x, y, 0, this.bulletSpeed, 0, 700);
this.nextFire = this.game.time.time + this.fireRate;
};
////////////////////////////////////////////////////////////////////////
// A single bullet that scales in size as it moves across the screen //
////////////////////////////////////////////////////////////////////////
Weapon.ScaleBullet = function (game) {
Phaser.Group.call(this, game, game.world, 'Scale Bullet', false, true, Phaser.Physics.ARCADE);
this.nextFire = 0;
this.bulletSpeed = 800;
this.fireRate = 100;
for (var i = 0; i < 32; i++)
{
this.add(new Bullet(game, 'bullet9'), true);
}
this.setAll('scaleSpeed', 0.05);
return this;
};
Weapon.ScaleBullet.prototype = Object.create(Phaser.Group.prototype);
Weapon.ScaleBullet.prototype.constructor = Weapon.ScaleBullet;
Weapon.ScaleBullet.prototype.fire = function (source) {
if (this.game.time.time < this.nextFire) { return; }
var x = source.x + 10;
var y = source.y + 10;
this.getFirstExists(false).fire(x, y, 0, this.bulletSpeed, 0, 0);
this.nextFire = this.game.time.time + this.fireRate;
};
/////////////////////////////////////////////
// A Weapon Combo - Single Shot + Rockets //
/////////////////////////////////////////////
Weapon.Combo1 = function (game) {
this.name = "Combo One";
this.weapon1 = new Weapon.SingleBullet(game);
this.weapon2 = new Weapon.Rockets(game);
};
Weapon.Combo1.prototype.reset = function () {
this.weapon1.visible = false;
this.weapon1.callAll('reset', null, 0, 0);
this.weapon1.setAll('exists', false);
this.weapon2.visible = false;
this.weapon2.callAll('reset', null, 0, 0);
this.weapon2.setAll('exists', false);
};
Weapon.Combo1.prototype.fire = function (source) {
this.weapon1.fire(source);
this.weapon2.fire(source);
};
/////////////////////////////////////////////////////
// A Weapon Combo - ThreeWay, Pattern and Rockets //
/////////////////////////////////////////////////////
Weapon.Combo2 = function (game) {
this.name = "Combo Two";
this.weapon1 = new Weapon.Pattern(game);
this.weapon2 = new Weapon.ThreeWay(game);
this.weapon3 = new Weapon.Rockets(game);
};
Weapon.Combo2.prototype.reset = function () {
this.weapon1.visible = false;
this.weapon1.callAll('reset', null, 0, 0);
this.weapon1.setAll('exists', false);
this.weapon2.visible = false;
this.weapon2.callAll('reset', null, 0, 0);
this.weapon2.setAll('exists', false);
this.weapon3.visible = false;
this.weapon3.callAll('reset', null, 0, 0);
this.weapon3.setAll('exists', false);
};
Weapon.Combo2.prototype.fire = function (source) {
this.weapon1.fire(source);
this.weapon2.fire(source);
this.weapon3.fire(source);
};
// The core game loop
var PhaserGame = function () {
this.background = null;
this.foreground = null;
this.player = null;
this.cursors = null;
this.speed = 300;
this.weapons = [];
this.currentWeapon = 0;
this.weaponName = null;
};
PhaserGame.prototype = {
init: function () {
this.game.renderer.renderSession.roundPixels = true;
this.physics.startSystem(Phaser.Physics.ARCADE);
},
preload: function () {
// We need this because the assets are on Amazon S3
// Remove the next 2 lines if running locally
this.load.baseURL = 'https://files.phaser.io.s3.amazonaws.com/codingtips/issue007/';
this.load.crossOrigin = 'anonymous';
this.load.image('background', 'assets/back.png');
this.load.image('foreground', 'assets/fore.png');
this.load.image('player', 'assets/ship.png');
this.load.bitmapFont('shmupfont', 'assets/shmupfont.png', 'assets/shmupfont.xml');
for (var i = 1; i <= 11; i++)
{
this.load.image('bullet' + i, 'assets/bullet' + i + '.png');
}
// Note: Graphics are not for use in any commercial project
},
create: function () {
this.background = this.add.tileSprite(0, 0, this.game.width, this.game.height, 'background');
this.background.autoScroll(-40, 0);
this.weapons.push(new Weapon.SingleBullet(this.game));
this.weapons.push(new Weapon.FrontAndBack(this.game));
this.weapons.push(new Weapon.ThreeWay(this.game));
this.weapons.push(new Weapon.EightWay(this.game));
this.weapons.push(new Weapon.ScatterShot(this.game));
this.weapons.push(new Weapon.Beam(this.game));
this.weapons.push(new Weapon.SplitShot(this.game));
this.weapons.push(new Weapon.Pattern(this.game));
this.weapons.push(new Weapon.Rockets(this.game));
this.weapons.push(new Weapon.ScaleBullet(this.game));
this.weapons.push(new Weapon.Combo1(this.game));
this.weapons.push(new Weapon.Combo2(this.game));
this.currentWeapon = 0;
for (var i = 1; i < this.weapons.length; i++)
{
this.weapons[i].visible = false;
}
this.player = this.add.sprite(64, 200, 'player');
this.physics.arcade.enable(this.player);
this.player.body.collideWorldBounds = true;
this.foreground = this.add.tileSprite(0, 0, this.game.width, this.game.height, 'foreground');
this.foreground.autoScroll(-60, 0);
this.weaponName = this.add.bitmapText(8, 364, 'shmupfont', "ENTER = Next Weapon", 24);
// Cursor keys to fly + space to fire
this.cursors = this.input.keyboard.createCursorKeys();
this.input.keyboard.addKeyCapture([ Phaser.Keyboard.SPACEBAR ]);
var changeKey = this.input.keyboard.addKey(Phaser.Keyboard.ENTER);
changeKey.onDown.add(this.nextWeapon, this);
},
nextWeapon: function () {
// Tidy-up the current weapon
if (this.currentWeapon > 9)
{
this.weapons[this.currentWeapon].reset();
}
else
{
this.weapons[this.currentWeapon].visible = false;
this.weapons[this.currentWeapon].callAll('reset', null, 0, 0);
this.weapons[this.currentWeapon].setAll('exists', false);
}
// Activate the new one
this.currentWeapon++;
if (this.currentWeapon === this.weapons.length)
{
this.currentWeapon = 0;
}
this.weapons[this.currentWeapon].visible = true;
this.weaponName.text = this.weapons[this.currentWeapon].name;
},
update: function () {
this.player.body.velocity.set(0);
if (this.cursors.left.isDown)
{
this.player.body.velocity.x = -this.speed;
}
else if (this.cursors.right.isDown)
{
this.player.body.velocity.x = this.speed;
}
if (this.cursors.up.isDown)
{
this.player.body.velocity.y = -this.speed;
}
else if (this.cursors.down.isDown)
{
this.player.body.velocity.y = this.speed;
}
if (this.input.keyboard.isDown(Phaser.Keyboard.SPACEBAR))
{
this.weapons[this.currentWeapon].fire(this.player);
}
}
};
game.state.add('Game', PhaserGame, true);
</script>
</body>
</html>