// the game itself
var game;
// global object with all game options
var gameOptions = {
// game width
gameWidth: 640,
// game height
gameHeight: 480,
// width of each floor
floorWidth: 640,
// height of each floor
floorHeight: 20,
// array with vertical floors potision
floorY: [100, 220, 340, 460],
// horizontal floor position
floorX: 0,
// size of the hero
squareSize: 16,
// horizontal speed of the hero
squareSpeed: 170,
// game gravity
squareGravity: 450,
// force to be applied at each jump
jumpForce: -210,
// jump tween length, in milliseconds
jumpTime: 500
}
// this is where we store level information
// gameLevels is an array.
// each gameLevel item is an array with floor information
// each gameLevel[floor] item is an object with:
// * obstacle width
// * obstacle height
// * obstacle position
var gameLevels = [
// floor 0
[
{
width: 60,
height: 30,
x: 200
},
{
width: 60,
height: 30,
x: 400
}
],
// floor 1
[
{
width: 40,
height: 30,
x: 250
},
{
width: 70,
height: 25,
x: 450
},
{
width: 30,
height: 20,
x: 100
}
],
// floor 2
[
{
width: 10,
height: 35,
x: 150
},
{
width: 10,
height: 35,
x: 300
},
{
width: 10,
height: 35,
x: 550
}
],
// floor 3
[
{
width: 80,
height: 10,
x: 280
}
]
]
// when the window loads
window.onload = function() {
// game creation
game = new Phaser.Game(gameOptions.gameWidth, gameOptions.gameHeight);
// adding game state
game.state.add("TheGame", TheGame);
// starting game state
game.state.start("TheGame");
}
var TheGame = function(){};
TheGame.prototype = {
// when the state preloads
preload: function(){
// setting the game on maximum scale mode
game.scale.scaleMode = Phaser.ScaleManager.SHOW_ALL;
game.scale.pageAlignHorizontally = true;
game.scale.pageAlignVertically = true;
// preloading the only game assets, a tile which will be used both for the square and the floor
game.load.image("tile", "assets/sprites/tile.png");
},
// once the state is ready
create: function(){
// creation of a group where we will place all floors
this.groundGroup = game.add.group();
// creation of a group where we will place all spikes, or obstacles, or whatever you will name them
this.spikeGroup = game.add.group();
// we start on the first floor
this.levelFloor = 0;
// adding the hero on the first floor
this.theSquare = game.add.sprite(gameOptions.floorX + gameOptions.squareSize / 2, gameOptions.floorY[0] - gameOptions.squareSize / 2, "tile");
// setting hero registration point
this.theSquare.anchor.set(0.5);
// setting hero width and height
this.theSquare.width = gameOptions.squareSize;
this.theSquare.height = gameOptions.squareSize;
// chen the hero jump?
this.theSquare.canJump = true;
// enabling ARCADE physics on the hero
game.physics.enable(this.theSquare, Phaser.Physics.ARCADE);
// setting hero horizontal velocity
this.theSquare.body.velocity.x = gameOptions.squareSpeed;
// gravity applied to the square
this.theSquare.body.gravity.y = gameOptions.squareGravity;
// time to create the floors
for(var i = 0; i < gameOptions.floorY.length; i++){
// each floor is a tile sprite
var floor = game.add.tileSprite(gameOptions.floorX, gameOptions.floorY[i], gameOptions.floorWidth, gameOptions.floorHeight, "tile");
// let's enable ARCADE physics on floors too
game.physics.enable(floor, Phaser.Physics.ARCADE);
// floors can't move
floor.body.immovable = true;
// adding the floor to ground group
this.groundGroup.add(floor);
// time to place the spikes
// let's loop through this level spikes
for(var j = 0; j < gameLevels[i].length; j++){
// creating the spike as a tileSprite
var spike = game.add.tileSprite(gameOptions.floorX + gameLevels[i][j].x, gameOptions.floorY[i], gameLevels[i][j].width, gameLevels[i][j].height, "tile");
// setting spike anchor point
spike.anchor.set(0.5, 1);
// enabling ARCADE physics to the spike
game.physics.enable(spike, Phaser.Physics.ARCADE);
// spikes can't move
spike.body.immovable = true;
// adding the spike to spike group
this.spikeGroup.add(spike);
}
}
// waiting for player input, then call squareJump function
game.input.onDown.add(this.squareJump, this);
},
// at each frame
update: function(){
// making the hero collide with floors so it won't fallo down
game.physics.arcade.collide(this.theSquare, this.groundGroup);
// checking if the hero overlaps with anything in spike group
game.physics.arcade.overlap(this.theSquare, this.spikeGroup, function(){
// in this case, restart the game
game.state.start("TheGame");
}, null, this);
// if the hero leaves the floor to the right or to the left...
if((this.theSquare.x > gameOptions.floorX + gameOptions.floorWidth && this.levelFloor % 2 == 0) || (this.theSquare.x < gameOptions.floorX && this.levelFloor % 2 == 1)){
// increasing floor number or setting it back to zero
this.levelFloor = (this.levelFloor + 1) % gameOptions.floorY.length;
// adjusting hero speed according to floor number: from left to right on even floors, from right to left on odd floors
this.theSquare.body.velocity.x = (this.levelFloor % 2 == 0) ? gameOptions.squareSpeed : -gameOptions.squareSpeed;
// no vertical velocity
this.theSquare.body.velocity.y = 0;
// the hero can jump again
this.theSquare.canjump = true;
// adjusting hero vertical and horizontal position
this.theSquare.y = gameOptions.floorY[this.levelFloor] - gameOptions.squareSize / 2;
this.theSquare.x = (this.levelFloor % 2 == 0) ? gameOptions.floorX : gameOptions.floorX + gameOptions.floorWidth;
// stopping the jump tween if running
if(this.jumpTween && this.jumpTween.isRunning){
this.jumpTween.stop();
this.theSquare.angle = 0;
}
}
// if the hero as its feet on the ground, it can jump
if(this.theSquare.body.touching.down){
this.theSquare.canJump = true;
}
},
// when the player jumps
squareJump: function(){
// if the hero can jump...
if(this.theSquare.canJump){
// preventing it to jump while in the air
this.theSquare.canJump = false;
// adding a vertical force to the player
this.theSquare.body.velocity.y = gameOptions.jumpForce;
// setting a jump rotation angle just to make the square rotate
var jumpAngle = this.levelFloor % 2 == 0 ? 180 : -180;
// using a tween to rotate the player
this.jumpTween = game.add.tween(this.theSquare).to({
angle: this.theSquare.angle + jumpAngle
}, gameOptions.jumpTime, Phaser.Easing.Linear.None, true);
}
}
}
With just a few lines we added deadly obstacles and level design, next time we’ll see how to add particle effects and more levels, meanwhile download the source code.Create a HTML5 game like Space is Key using Phaser, tweens and ARCADE physics – step 2: adding spikes
Read all posts about "Space is Key" game
If you enjoyed last week’s update to Space is Key series adding Phaser 2.6.2 version in the post Create a HTML5 game like Space is Key using Phaser, tweens and ARCADE physics you will like this update as I am showing you how to create levels adding deadly obstacles.
Let’s see what we are going to create:
Click or touch the canvas to make the player jump, don’t hit an obstacle or you will have to restart from scratch.
I am showing you the full source code, with each line commented for you to understand it, and with new lines highlighted, so you will find easy to see what I added to the original prototype.
