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Moving plateforms problem


ibobtouch
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Hi everyone,

 

My apologies for my bad english, i'm french  :unsure:

 

Here's my code:

<!doctype html> <html lang="en"> <head> 	<meta charset="UTF-8" />	<title>Phaser</title>	<script type="text/javascript" src="js/phaser.js"></script>    <style type="text/css">        body {            margin: 0;        }    </style></head><body><div id="game"></div><script type="text/javascript">var game = new Phaser.Game(800, 600, Phaser.AUTO, 'game', { preload: preload, create: create, update: update });function preload() {	this.load.image('player', 'assets/j1.png');	this.load.image('plate', 'assets/bloc.png');}function create() {	game.physics.startSystem(Phaser.Physics.ARCADE);	this.stage.backgroundColor = '#7e7e7e';	player = new Player(game, 20, 20);	game.add.existing(player);	game.time.events.loop(Phaser.Timer.SECOND * 1.25, genPlateforms);    //Generation de plateforme  //FPS	game.time.advancedTiming = true;    fpsText = game.add.text(        20, 20, '', { font: '16px Arial', fill: '#ffffff' }    );	}function update() {	if (game.time.fps !== 0) {        fpsText.setText(game.time.fps + ' FPS');    }}var genPlateforms = function(){	random = game.rnd.integerInRange(-50, 50); //Valeur Random	plateforms = new Plateforms(game, game.width , game.height / 2 + random); //Plateforms a hauteur random depuis le milieu	game.add.existing(plateforms);}// Player contructorvar Player = function(game, x, y, frame) {  Phaser.Sprite.call(this, game, x, y, 'player', frame);  this.game.physics.arcade.enableBody(this);    this.body.bounce.y = 0.1 ;  this.body.gravity.y = 600;  this.body.collideWorldBounds = true; //Collision avec les bords    cursors = this.game.input.keyboard.createCursorKeys();};Player.prototype = Object.create(Phaser.Sprite.prototype);Player.prototype.constructor = Player;Player.prototype.update = function() {this.body.velocity.x = 0;if (cursors.left.isDown)    {        this.body.velocity.x = -500;    }else    if (cursors.right.isDown)    {        this.body.velocity.x = 500;    }if (cursors.up.isDown)// && this.body.blocked.down)    {      this.body.velocity.y = -400;      }};//Plateforms Constructorvar Plateforms = function(game, x, y, frame) {  Phaser.Sprite.call(this, game, x, y, 'plate', frame);  	  	this.anchor.setTo(0.5,0.5); 	this.game.physics.arcade.enableBody(this); 	this.body.immovable = true; 	this.body.velocity.x = -350; 	this.checkWorldBounds = true;  this.outOfBoundsKill = true; //Detruire l'objet non visible};Plateforms.prototype = Object.create(Phaser.Sprite.prototype);Plateforms.prototype.constructor = Plateforms;Plateforms.prototype.update = function() {game.physics.arcade.collide(player, plateforms); //Collision entre le player et les plateformes};</script></body></html>

this is what you get:

 

RtqAgs6.png

 

So i split the screen by 3 zone to explain my problem:

kmt7UYZ.png

 

Zone 3:

The player is able to jump on the plateforms, it work perfectly.

 

Zone 2:

The player don't collide with the top of the plateforms, 

 

Zone 1:

The player don't collide with the plateforms

 

I don't know why. I already try it with the yeoman generator, same result, so i'm sure the problem is from the code(also because i'm a newbie in JS).

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You need to call any collide/overlap routines in your main update function, not in the platform instances. Remove the Platform.prototype.update part entirely, and then change the main update function to this:

function update() {    game.physics.arcade.collide(player, plateforms);    if (game.time.fps !== 0) {        fpsText.setText(game.time.fps + ' FPS');    }}

Although this won't work as intended either, it's a step in the right direction. You should make plateforms a group via game.add.group():

function create() {	game.physics.startSystem(Phaser.Physics.ARCADE);	this.stage.backgroundColor = '#7e7e7e';	player = new Player(game, 20, 20);	game.add.existing(player);	game.time.events.loop(Phaser.Timer.SECOND * 1.25, genPlateforms);    //Generation de plateforme  //FPS	game.time.advancedTiming = true;    fpsText = game.add.text(        20, 20, '', { font: '16px Arial', fill: '#ffffff' }    );	plateforms = game.add.group();}

And change genPlateforms to the following:

var genPlateforms = function(){	random = game.rnd.integerInRange(-50, 50); //Valeur Random	var plateform = new Plateforms(game, game.width , game.height / 2 + random); //Plateforms a hauteur random depuis le milieu	plateforms.add(plateform);}

Then the above should work and check against all platforms.

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Because body.blocked.down only detects when you're stood on tiles or the world bounds - you need to check body.touching.down instead, and ensure you check it after the collision check has been done, as it's reset at the start of each frame, and only checking for collisions will it be set appropriately for that frame. You may want to do this by moving the movement code out of Player.prototype.update and calling it manually instead to be sure - change Player.prototype.update to Player.prototype.checkControls and then in your main update function do:

function update() {    game.physics.arcade.collide(player, plateforms);    if (game.time.fps !== 0) {        fpsText.setText(game.time.fps + ' FPS');    }    if (player) { // just to be sure the player object has been instantiated - you may not need this if statement      player.checkControls();    }}
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