for college I have to create a game, my game involves falling objects. But I cannot figure out how to lose a life when the object goes out of bounds.
Heres some of my code:
//my variables
var player;
var lives;
var max_lives = 3;
var objects;
var totalLife
var lifeText;
var totalScore;
var scoreText;
var inputs;
//creates the group for the objects
objects = this.add.group();
this.physics.enable(objects, Phaser.Physics.ARCADE);
objects.setAll('outOfBoundsKill', true);
objects.setAll('checkWorldBounds', true);
//spawns object
spawnObject: function () {
var random = this.rnd.integerInRange(0, 25);
if (random === 0) {
var randomX = this.rnd.integerInRange(0, this.world.width - 150);
var object = objects.create(randomX, -50, 'object');
this.physics.enable(object, Phaser.Physics.ARCADE);
object.body.velocity.y = this.rnd.integerInRange(200, 300);
}
}
Sprites fire an event when they leave the world bounds. Listen for it to drop one life.
Enable the event being emitted using:
sprite.checkWorldBounds = true;
Then, you can listen for:
sprite.events.onOutOfBounds
...and react to it by dropping one life.
Related
I found this great tutorial on creating draggable maps with inertia: http://www.emanueleferonato.com/2016/01/18/how-to-create-a-html-draggable-and-scrollable-map-with-inertia-using-phaser-framework/
The tutorial has the dragging effect applied on just an image. I'm trying to have the dragging effect applied on a group of sprites instead, so they would all drag at the same time (map image + group of sprites).
The issue I have is that I'm a little confused about what this.scrollingMap represents syntax-wise. So when it comes to replacing this line with a group, I'm a little lost.
this.scrollingMap = game.add.image(0, 0, "map");
Anyone have any ideas?
I copied the simplified code below as well if that helps.
var game = new Phaser.Game(window.innerWidth, window.innerHeight, Phaser.AUTO, '', { preload: preload, create: create, update: update });
function preload() {
game.load.image('map', 'assets/images/baseMap.png');
game.load.image('star', 'assets/images/star.png');
}
function create() {
// Creating the group
world = game.add.group();
world.create(0, 0, 'map');
// Adding random sprites to it
for (var i = 0; i < 10; i++)
{ world.create(game.world.randomX, game.world.randomY, 'star');}
//This group works on its own.
//I would like to link it to the dragging animation below "scrollingMap".
//The Draggable Map from the tutorial
// Adding the big map to scroll
this.scrollingMap = game.add.image(0, 0, "map"); //<-- This is where I am having trouble changing from an image to a group.
// map will accept inputs
this.scrollingMap.inputEnabled = true;
// map can be dragged
this.scrollingMap.input.enableDrag(false);
// custom property: we save map position
this.scrollingMap.savedPosition = new Phaser.Point(this.scrollingMap.x, this.scrollingMap.y);
// custom property: the map is not being dragged at the moment
this.scrollingMap.isBeingDragged = false;
// custom property: map is not moving (or is moving at no speed)
this.scrollingMap.movingSpeed = 0;
// map can be dragged only if it entirely remains into this rectangle
this.scrollingMap.input.boundsRect = new Phaser.Rectangle(game.width - this.scrollingMap.width, game.height - this.scrollingMap.height, this.scrollingMap.width * 2 - game.width, this.scrollingMap.height * 2 - game.height);
// when the player starts dragging...
this.scrollingMap.events.onDragStart.add(function(){
this.scrollingMap.isBeingDragged = true;
// set movingSpeed property to zero. This will stop moving the map
// if the player wants to drag when it's already moving
this.scrollingMap.movingSpeed = 0;
}, this);
// when the player stops dragging...
this.scrollingMap.events.onDragStop.add(function(){
this.scrollingMap.isBeingDragged = false;
}, this);
} //End create function
function update() {
// if the map is being dragged...
if(this.scrollingMap.isBeingDragged){
this.scrollingMap.savedPosition = new Phaser.Point(this.scrollingMap.x, this.scrollingMap.y);
}
// if the map is NOT being dragged...
else{
// if the moving speed is greater than 1...
if(this.scrollingMap.movingSpeed > 1){
this.scrollingMap.x += this.scrollingMap.movingSpeed * Math.cos(this.scrollingMap.movingangle);
this.scrollingMap.y += this.scrollingMap.movingSpeed * Math.sin(this.scrollingMap.movingangle);
if(this.scrollingMap.x < game.width - this.scrollingMap.width){
this.scrollingMap.x = game.width - this.scrollingMap.width;
}
if(this.scrollingMap.x > 0){
this.scrollingMap.x = 0;
}
if(this.scrollingMap.y < game.height - this.scrollingMap.height){
this.scrollingMap.y = game.height - this.scrollingMap.height;
}
if(this.scrollingMap.y > 0){
this.scrollingMap.y = 0;
}
this.scrollingMap.movingSpeed *= friction;
// save current map position
this.scrollingMap.savedPosition = new Phaser.Point(this.scrollingMap.x, this.scrollingMap.y);
}
// if the moving speed is less than 1...
else{
var distance = this.scrollingMap.savedPosition.distance(this.scrollingMap.position);
var angle = this.scrollingMap.savedPosition.angle(this.scrollingMap.position);
if(distance > 4){
this.scrollingMap.movingSpeed = distance * speedMult;
this.scrollingMap.movingangle = angle;
}
}
}
}
So, I ended up finding the solution...
First off, I removed all this.scrollingMap and changed them to scrollingMap to remove any confusion. Ended up stil working perfectly.
scrollingMap = game.add.image(0, 0, "map");
scrollingMap.anchor.set(0.05,0.5);
scrollingMap.inputEnabled = true;
[etc...]
Next, Groups in Phaser don't seem to be able to have input working on elements together, only one at a time. So changing to something like wouldn't work:
scrollingMap = game.add.group();
map = game.add.image(0, 0, "map");
scrollingMap.add(map);
// The following line won't work
scrollingMap.inputEnabled = true;
I tried using the Align functions that Phaser offers... Until I ended up realising that you can actually nest sprites within other sprites like so:
scrollingMap = game.add.image(0, 0, "map");
someSprite = game.add.image(100, 100, "sprite");
scrollingMap.addChild(someSprite);
And voila! There's the solution, as simple as that.
Note that you can also add groups as children:
someGroup = game.add.group();
scrollingMap.addChild(someGroup);
Found the solution here if anyone's curious:
http://www.html5gamedevs.com/topic/7745-move-a-group-of-sprites-together-as-one-body/
I'm making a sidescroller using Phaser (latest version) and I want the player's projectiles to go towards the pointer when the player clicks, like they do in this example http://phaser.io/examples/v2/games/tanks. I've used some of the code from the example but in my game, the activePointer x and y co-ordinates seem to only initialise when the game starts and never change. So when the player shoots, it's always going towards the same co-ordinates.
I have the following code (note I have removed bits about item collection, enemies etc. for posting on here):
var SideScroller = SideScroller || {};
var startPosX = 100;
var startPosY = 300;
var shooter;
var playerBullets;
var nextFire = 0;
var fireRate = 100;
var cursors;
var currentLoc;
SideScroller.Game = function () {};
SideScroller.Game.prototype = {
create: function () {
//create player
//params = (game, startPositionX,startPositionY, key, frame)
this.player = this.game.add.sprite(startPosX, startPosY, 'player');
//get canvas width and height for later use
canvasWidth = this.game.canvas.width;
canvasHeight = this.game.canvas.height;
//create enemy
var x = this.game.rnd.between(80, this.game.world.width);
var y = this.game.rnd.between(0, 113);
// Point to shoot projectiles from
// allows rotation, if this had been done on the player object, the graphic would have rotated, which we don't want
this.shooter = this.game.add.sprite(startPosX, startPosY, 'blank');
this.shooter.anchor.setTo(0.5, 0.5);
//make a group of player projectiles
playerBullets = this.game.add.group();
playerBullets.enableBody = true;
playerBullets.physicsBodyType = Phaser.Physics.ARCADE;
playerBullets.createMultiple(1000, 'peePower');
playerBullets.setAll('anchor.x', 0.5);
playerBullets.setAll('anchor.y', 0.5);
playerBullets.setAll('outOfBoundsKill', true);
playerBullets.setAll('checkWorldBounds', true);
//enable physics on the player
this.game.physics.arcade.enable(this.player);
//bring player shooting point to the top (not totally necessary)
this.shooter.bringToTop();
//player gravity
this.player.body.gravity.y = gravity;
//player collides with all four edges of the game world
this.player.body.collideWorldBounds = true;
this.player.anchor.setTo(0.5, 0.5);
//the camera will follow the player in the world
this.game.camera.follow(this.player);
//move player with cursor keys
cursors = this.game.input.keyboard.createCursorKeys();
},
update: function () {
currentLoc = this.game.input.activePointer;
//collision between player and platforms
this.game.physics.arcade.collide(this.player, this.blockedLayer, null, null, this);
//make co-ordinates match
this.shooter.x = this.player.x;
this.shooter.y = this.player.y;
//this.shooter's angle towards
this.shooter.rotation = this.game.physics.arcade.angleToPointer(this.shooter, this.game.input.activePointer);
//only respond to keys if the player is alive
if (this.player.alive) {
this.player.body.velocity.x = 0;
if (this.game.input.activePointer.isDown) {
console.log("pointer is down");
this.fire();
}
else if (cursors.right.isDown) {
this.playerForward();
}
else if (cursors.left.isDown) {
this.playerBack();
}
else if (cursors.up.isDown) {
this.playerJump();
}
else if (cursors.down.isDown) {
this.fire();
this.playerDuck();
}
}
},
fire: function () {
//for debugging
console.log("fire was called");
console.log(this.game.input.activePointer.x);
console.log(this.game.input.activePointer.y);
if (this.game.time.now > nextFire && playerBullets.countDead() > 0)
{
nextFire = this.game.time.now + fireRate;
var bullet = playerBullets.getFirstExists(false);
bullet.reset(this.shooter.x, this.shooter.y);
currentLoc = this.game.input.activePointer;
bullet.rotation = this.game.physics.arcade.moveToPointer(bullet, 1000, currentLoc, 1000);
console.log(this.game.input.activePointer);
}
},
playerForward: function () {
this.player.loadTexture('player');
this.player.body.setSize(this.player.standDimensions.width, this.player.standDimensions.height);
this.player.body.velocity.x = 700;
this.player.isMoving = true;
//console.log("Forward height:" + this.player.standDimensions.height);
//console.log("Forward width:" + this.player.standDimensions.width);
},
playerBack: function () {
this.player.loadTexture('playerBack');
this.player.body.velocity.x -= 700;
this.player.isMoving = true;
},
playerJump: function () {
if (this.player.body.blocked.down) {
this.player.body.velocity.y -= 700;
this.player.loadTexture('playerJump');
//console.log("Jump height:" + this.player.jumpDimensions.height);
//console.log("Jump width:" + this.player.jumpDimensions.width);
}
},
playerDuck: function () {
//change image and update the body size for the physics engine
this.player.loadTexture('playerDuck');
this.player.body.setSize(this.player.duckedDimensions.width, this.player.duckedDimensions.height);
//keep track of whether player is ducked or not
this.player.isDucked = true;
},
playerDead: function () {
//set to dead (this doesn't affect rendering)
this.player.alive = false;
//stop moving to the right
this.player.body.velocity.x = 0;
//change sprite image
this.player.loadTexture('playerDead');
},
};
Shooter is a blank sprite on top of the player (much like the turret in the tank example) to allow for rotation without the player rotating (please let me know also if there's a better way to do that!).
I tried updating the currentLoc variable in the update method to the activePointer location but that didn't work.
In addition, this condition has never been hit:
if (this.game.input.activePointer.isDown) {
console.log("pointer is down");
this.fire();
}
So something must be going awry with detecting mouse clicks and I don't know if that's part of the problem?
I think you should look it up in the API. There are few points in your code that are questionable.
http://phaser.io/docs/2.3.0/Phaser.Pointer.html
http://phaser.io/docs/2.3.0/Phaser.Physics.Arcade.html#moveToPointer
The point is that you are actually giving the reference to the pointer (to currentLoc) but not the position. So it should always fire to 0;0.
And for the isDown detection, have you done it in the update function or somewhere else?
Hope i could help!
edit: SOLVED
I'm a highschool student in Japan trying to learn how to program.
I recently viewed https://vimeo.com/105955605 this video, and decided I could use the beginning section to start building pong in javascript.
I'm pretty much a complete novice with programming and/or javascript and I still have a long way to go.
I got Player1 (left paddle) to work on its own, so I figured I could just copy paste, mess with a couple things, and make Player2. However, now Player2 moves when I press w/s, but Player1 no longer moves.
I've tried creating 2 separate keyboarder() functions, using this.keyboarder from Player1 in player2 (Player2.keyboarder = Player1.keyboarder() ), and declaring/calling keyboarder() before doing anything else.
HTML:
<html>
<head>
<meta charset="UTF-8">
<title>Pong</title>
<link type="text/css" rel="stylesheet" href="css/stylesheet.css">
</head>
<body>
<canvas id="screen" width="310" height="210"></canvas>
<script src="js/pong.js"></script>
</body>
</html>
JavaScript:
;(function(){
//Main game function
//tells objects in bodies array to update.
//stores gameSize pulled from canvasId
var Game = function(canvasId){
var canvas = document.getElementById(canvasId);
var screen = canvas.getContext('2d');
var gameSize = {x: canvas.width, y: canvas.height};
var self = this;
//bodies array
this.bodies = [new Player1(this, gameSize), new Player2(this, gameSize)];
//update function
var tick = function(){
self.update();
self.draw(screen,gameSize);
requestAnimationFrame(tick);
};
tick();
};
//constructer for game() function. tells bodies to update, and draw
Game.prototype = {
update: function(){
for(var i =0 ; i < this.bodies.length; i++){
this.bodies[i].update();
}
},
draw:function(screen,gameSize){
screen.clearRect(0,0,gameSize.x,gameSize.y);
for(var i =0 ; i < this.bodies.length; i++){
drawRect(screen, this.bodies[i]);
}
}
};
//P1 object, declares size and start position of P1
var Player1= function(game, gameSize){
this.size = {x:30,y:gameSize.y / 3};
this.game = game;
this.gameSize = gameSize;
this.center = {x: 0, y:gameSize.y/2};
this.keyboarder = new Keyboarder();
requestAnimationFrame(this.update);
};
//constructor for P1, updates position based on keyboard input
Player1.prototype = {
update:function(){
if (this.keyboarder.isDown(this.keyboarder.KEYS.DOWN) && this.center.y < (5*this.gameSize.y / 6)){
this.center.y += 4;
}else if(this.keyboarder.isDown(this.keyboarder.KEYS.UP) && this.center.y > this.size.y /2 ){
this.center.y -= 4;
}
}
};
//P2, same as P1 aside from position
var Player2= function(game, gameSize){
this.size = {x:30,y:gameSize.y / 3};
this.game = game;
this.gameSize = gameSize;
this.center = {x: gameSize.x, y:gameSize.y/2};
this.keyboarder = new Keyboarder();
requestAnimationFrame(this.update);
};
//constructor for P2, same as P1
Player2.prototype = {
update:function(){
if (this.keyboarder.isDown(this.keyboarder.KEYS.S) && this.center.y < (5*this.gameSize.y / 6)){
this.center.y += 4;
}else if(this.keyboarder.isDown(this.keyboarder.KEYS.W) && this.center.y > this.size.y /2 ){
this.center.y -= 4;
}
}
};
//Draw function, draws object
var drawRect = function(screen, body){
screen.fillRect(body.center.x - body.size.x /2,
body.center.y - body.size.y /2, body.size.x,body.size.y);
};
//Keyboard input function
//reads if keys are being pressed and takes the event code
//isDown() returns boolean of key down = true, key up = false
var Keyboarder = function(
){
var keyState = {};
window.onkeydown = function(e){
keyState[e.keyCode] = true;
};
window.onkeyup = function(e){
keyState[e.keyCode] = false;
};
this.KEYS = {DOWN: 37, UP:39,W:87 , S: 83};
this.isDown = function(keyCode){
return keyState[keyCode] === true;
};
};
//calls game() function when the page has loaded.
window.onload = function(){
new Game("screen")
};
})();
Sorry if this is bad protocol for using stackoverflow, I'm also new to asking questions here.
The problem is you have two Keyboarder instances, and they're both binding to the key events by assigning a handler directly to them - this will overwrite any other handlers. There's two ways to fix it:
1: Don't assign directly, instead use addEventListener, eg:
window.addEventListener('keydown', function(e){
keyState[e.keyCode] = true;
});
2: Use the same keyboarder instance for both players:
var kb = new Keyboarder();
this.bodies = [new Player1(this, gameSize, kb), new Player2(this, gameSize, kb)];
and in your player object assign it to this 3rd parameter. Even if you go this route, I would still advise on using addEventListener as well simply to ensure that the events can be bound to in multiple places if needed.
On another point, you should also be able to refactor your players into a single function and create two instances of it with different parameters, but that sort of thing is better dealt with over on Code Review.
When you create two Keyboarder instances, one collides with the other, because of this:
window.onkeydown = function(e){
keyState[e.keyCode] = true;
};
window.onkeyup = function(e){
keyState[e.keyCode] = false;
};
When you create one Keyboarder, the event listeners the previous one attached are overriden. Try something like this:
window.addEventListener('keydown', function(e){
keyState[e.keyCode] = true;
});
window.addEventListener('keyup', function(e){
keyState[e.keyCode] = false;
});
This ensures there are listeners for every instance of the Keyboarder.
Although I have used Javascript extensively in the past, I have never used classes and objects in my programs. This is also the first for me using the HTML5 canvas element with an extra Javascript library. The library I'm using is EaselJS.
Short and sweet, I'm trying to make a square move with keyboard input, using object-oriented programming. I've already looked over sample game files, but I've never been able to properly get one to work.
The following is my classes script:
/*global createjs*/
// Shorthand createjs.Shape Variable
var Shape = createjs.Shape;
// Main Square Class
function square(name) {
this.name = name;
this.vX = 0;
this.vY = 0;
this.canMove = false;
this.vX = this.vY = 0;
this.canMove = false;
this.body = new Shape();
this.body.graphics.beginFill("#ff0000").drawRect(0, 0, 100, 100);
}
And below is my main script:
/*global createjs, document, window, square, alert*/
// Canvas and Stage Variables
var c = document.getElementById("c");
var stage = new createjs.Stage("c");
// Shorthand Create.js Variables
var Ticker = createjs.Ticker;
// Important Keycodes
var keycode_w = 87;
var keycode_a = 65;
var keycode_s = 83;
var keycode_d = 68;
var keycode_left = 37;
var keycode_right = 39;
var keycode_up = 38;
var keycode_down = 40;
var keycode_space = 32;
// Handle Key Down
window.onkeydown = handleKeyDown;
var lfHeld = false;
var rtHeld = false;
// Create Protagonist
var protagonist = new square("Mr. Blue");
// Set Up Ticker
Ticker.setFPS(60);
Ticker.addEventListener("tick", stage);
if (!Ticker.hasEventListener("tick")) {
Ticker.addEventListener("tick", tick);
}
// Init Function, Prepare Protagonist Placement
function init() {
protagonist.x = c.width / 2;
protagonist.y = c.height / 2;
stage.addChild(protagonist);
}
// Ticker Test
function tick() {
if (lfHeld) {
alert("test");
}
}
// Handle Key Down Function
function handleKeyDown(event) {
switch(event.keyCode) {
case keycode_a:
case keycode_left: lfHeld = true; return false;
case keycode_d:
case keycode_right: rtHeld = true; return false;
}
}
This is the error I get in the Developer Tools of Chrome:
Uncaught TypeError: undefined is not a function
easeljs-0.7.0.min.js:13
In case you're wondering, the order of my script tags is the EaselJS CDN, followed by my class, followed by the main script file.
I would really like closure on this question. Thank you in advance.
I figured it out. I was adding the entire protagonist instance to the stage. I've fixed by adding the protagonist.body to the stage.
I am in desperate need to fix a problem I have in html5 canvas. I am making an educational game, but after adding another photo and making the necessary code changes, but the canvas blanked out. I reverted the changes, but the problem persisted. I spent the past week or so trying to fix it, but I've run out of ideas :( Here is the relevent code (if anyone needs another part, just say so):
// Create the canvas
var canvas = document.createElement("canvas");
var ctx = canvas.getContext("2d");
canvas.width = 1041;
canvas.height = 550;
document.body.appendChild(canvas);
// Background image
var bgReady = false;
var bgImage = new Image();
bgImage.onload = function () {
bgReady = true;
};
bgImage.src = "images/introbackground.png";
//.... rest of the photos load like this so I won't put it...
// Level 1 background 1 image
var bbg1Ready = false;
var bbg1Image = new Image();
bbg1Image.onload = function () {
bbg1Ready = false; //Exception since it shouldn't load at the beginning
};
bbg1Image.src = "images/pollutedbeach1.png";
// Game objects
var hero = {
speed: 200 // movement in pixels per second
};
var level1;
var level2;
var biolevel = false;
//...Code to make the hero picture move with arrow keys and to reset the game are skipped...
if (hero.x <= (level1.x + 345)
&& level1.x <= (hero.x + 32)
&& hero.y <= (level1.y +50)
&& level1.y <= (hero.y + 32)){
biolevel = true;
return biolevel;
}
var render = function () {
if (bgReady) {
ctx.drawImage(bgImage, 0, 0);
}
//...The same for all photos previously loaded...
if (biolevel == true){
level1Ready = false;
level2Ready = false;
bbg1Ready = true;
hero.speed = 125;
}
};
//...Then the main game loop to animate it...
Sorry It's kind of long, but I really need a solution. Thanks!