Platform Game Demo

Basic code from blog.jugaa.me, teaching the basis to make a platform game with HTML5 Canvas + Javascript.

by omegapocalypse

HTML

<canvas id="canvas" width="300" height="290" style="background:#999"></canvas>

JavaScript

(function(){
    'use strict';
    window.addEventListener('load',init,false);
    var KEY_ENTER=13;
    var KEY_LEFT=37;
    var KEY_UP=38;
    var KEY_RIGHT=39;
    var KEY_DOWN=40;

    var canvas=null,ctx=null;
    var lastPress=null;
    var pressing=[];
    var pause=false;
    var gameover=true;
    var onGround=false;
    var worldWidth=0,worldHeight=0;
    var player=new Rectangle(40,40,10,10);
    var cam=new Camera();
    var wall=[];
    var lava=[];
    var iPlatform=new Image();
    iPlatform.src='http://sites.google.com/site/juegoscanvas/platform.png';
    
    var map1=[
    1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
    1,2,2,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
    1,2,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
    1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,1,
    1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,1,0,0,1,
    1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1,0,0,1,
    1,0,0,0,0,0,2,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1,0,0,1,
    0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,2,2,0,0,1,0,0,0,
    0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,2,2,0,0,1,0,0,0,
    1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,1,0,0,1,
    1,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,1,0,0,0,0,0,0,1,0,0,1,
    1,0,0,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,1,1,1,0,0,1,
    1,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,
    1,2,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,
    1,2,2,1,1,1,1,1,1,1,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,1,1,1,
    1,2,2,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
    1,2,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
    1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,1,
    1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,1,0,0,1,
    1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1,0,0,1,
    1,0,0,0,0,0,2,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1,0,0,1,
   ...