Forked from: rolandas_kairys's forked: Space Battles (adding lives) View Diff (39)

forked: Space Battles (adding lives)

rolandas_kai

2014-05-03 20:29:31

License: MIT License

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CSS 61 lines

failled to add up and down functionality

forked: Space Battles (adding lives)

// forked from rolandas_kairys's "forked: Space Battles (adding lives)      " http://jsdo.it/rolandas_kairys/9Lpz
// forked from rolandas_kairys's "forked: Space Battles           " http://jsdo.it/rolandas_kairys/cGkM
////// forked from rolandas_kairys's "Space Battles           " http://jsdo.it/rolandas_kairys/dNmW
(function() {
    var lastTime = 0;
    var vendors = ['ms', 'moz', 'webkit', 'o'];
    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
        window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
        window.cancelAnimationFrame = 
          window[vendors[x]+'CancelAnimationFrame'] || window[vendors[x]+'CancelRequestAnimationFrame'];
    }
 
    if (!window.requestAnimationFrame)
        window.requestAnimationFrame = function(callback, element) {
            var currTime = new Date().getTime();
            var timeToCall = Math.max(0, 16 - (currTime - lastTime));
            var id = window.setTimeout(function() { callback(currTime + timeToCall); }, 
              timeToCall);
            lastTime = currTime + timeToCall;
            return id;
        };
 
    if (!window.cancelAnimationFrame)
        window.cancelAnimationFrame = function(id) {
            clearTimeout(id);
        };
}());

var Game = new function() {                                                                  
  var boards = [];
  this.initialize = function(canvasElementId,sprite_data,callback) {
    this.canvas = document.getElementById(canvasElementId);

this.playerOffset = 10;
    this.canvasMultiplier= 1;
    this.setupMobile();

this.width = this.canvas.width;
    this.height= this.canvas.height;

this.ctx = this.canvas.getContext && this.canvas.getContext('2d');
    if(!this.ctx) { return alert("Please upgrade your browser to play"); }

this.setupInput();

this.loop();

if(this.mobile) {
      this.setBoard(4,new TouchControls());
    }

SpriteSheet.load(sprite_data,callback);
  };

var KEY_CODES = { 37:'left', 38:'up', 39:'right', 40:'down', 32 :'fire' };
  this.keys = {};

this.setupInput = function() {
    window.addEventListener('keydown',function(e) {
      if(KEY_CODES[e.keyCode]) {
       Game.keys[KEY_CODES[e.keyCode]] = true;
       e.preventDefault();
      }
    },false);

window.addEventListener('keyup',function(e) {
      if(KEY_CODES[e.keyCode]) {
       Game.keys[KEY_CODES[e.keyCode]] = false; 
       e.preventDefault();
      }
    },false);
  };

var lastTime = new Date().getTime();
  var maxTime = 1/30;
  // Game Loop
  this.loop = function() { 
    var curTime = new Date().getTime();
    requestAnimationFrame(Game.loop);
    var dt = (curTime - lastTime)/1000;
    if(dt > maxTime) { dt = maxTime; }

for(var i=0,len = boards.length;i<len;i++) {
      if(boards[i]) { 
        boards[i].step(dt);
        boards[i].draw(Game.ctx);
      }
    }
    lastTime = curTime;
  };
 
  this.setBoard = function(num,board) { boards[num] = board; };

this.setupMobile = function() {
    var container = document.getElementById("container"),
        hasTouch =  !!('ontouchstart' in window),
        w = window.innerWidth, h = window.innerHeight;
      
    if(hasTouch) { this.mobile = true; }

if(screen.width >= 1280 || !hasTouch) { return false; }

if(w > h) {
      alert("Please rotate the device and then click OK");
      w = window.innerWidth; h = window.innerHeight;
    }

container.style.height = h*2 + "px";
    window.scrollTo(0,1);

h = window.innerHeight + 2;
    container.style.height = h + "px";
    container.style.width = w + "px";
    container.style.padding = 0;

if(h >= this.canvas.height * 1.75 || w >= this.canvas.height * 1.75) {
      this.canvasMultiplier = 2;
      this.canvas.width = w / 2;
      this.canvas.height = h / 2;
      this.canvas.style.width = w + "px";
      this.canvas.style.height = h + "px";
    } else {
      this.canvas.width = w;
      this.canvas.height = h;
    }

this.canvas.style.position='absolute';
    this.canvas.style.left="0px";
    this.canvas.style.top="0px";

};

var SpriteSheet = new function() {
  this.map = { };

this.load = function(spriteData,callback) { 
    this.map = spriteData;
    this.image = new Image();
    this.image.onload = callback;
    this.image.src = 'http://jsrun.it/assets/k/V/e/v/kVevG.png';
  };

this.draw = function(ctx,sprite,x,y,frame) {
    var s = this.map[sprite];
    if(!frame) frame = 0;
    ctx.drawImage(this.image,
                     s.sx + frame * s.w, 
                     s.sy, 
                     s.w, s.h, 
                     Math.floor(x), Math.floor(y),
                     s.w, s.h);
  };

return this;
};

var TitleScreen = function TitleScreen(title,subtitle,callback) {
  var up = false;
  this.step = function(dt) {
    if(!Game.keys['fire']) up = true;
    if(up && Game.keys['fire'] && callback) callback();
  };

this.draw = function(ctx) {
    ctx.fillStyle = "#FFFF00";

ctx.font = "bold 37px Courier";
    var measure = ctx.measureText(title);  
    ctx.fillText(title,Game.width/2 - measure.width/2,Game.height/2);

ctx.font = "bold 15px Courier";
    var measure2 = ctx.measureText(subtitle);
    ctx.fillText(subtitle,Game.width/2 - measure2.width/2,Game.height/2 + 40);
  };
};

var GameBoard = function() {
  var board = this;
    
  this.objects = [];
  this.cnt = {};

// Add a new object to the object list
  this.add = function(obj) { 
    obj.board=this; 
    this.objects.push(obj); 
    this.cnt[obj.type] = (this.cnt[obj.type] || 0) + 1;
    return obj; 
  };

// Mark an object for removal
  this.remove = function(obj) { 
    var idx = this.removed.indexOf(obj);
    if(idx == -1) {
      this.removed.push(obj); 
      return true;
    } else {
      return false;
    }
  };

// Reset the list of removed objects
  this.resetRemoved = function() { this.removed = []; };

// Removed an objects marked for removal from the list
  this.finalizeRemoved = function() {
    for(var i=0,len=this.removed.length;i<len;i++) {
      var idx = this.objects.indexOf(this.removed[i]);
      if(idx != -1) {
        this.cnt[this.removed[i].type]--;
        this.objects.splice(idx,1);
      }
    }
  };

// Call the same method on all current objects 
  this.iterate = function(funcName) {
     var args = Array.prototype.slice.call(arguments,1);
     for(var i=0,len=this.objects.length;i<len;i++) {
       var obj = this.objects[i];
       obj[funcName].apply(obj,args);
     }
  };

// Find the first object for which func is true
  this.detect = function(func) {
    for(var i = 0,val=null, len=this.objects.length; i < len; i++) {
      if(func.call(this.objects[i])) return this.objects[i];
    }
    return false;
  };

// Call step on all objects and them delete
  // any object that have been marked for removal
  this.step = function(dt) { 
    this.resetRemoved();
    this.iterate('step',dt);
    this.finalizeRemoved();
  };

// Draw all the objects
  this.draw= function(ctx) {
    this.iterate('draw',ctx);
  };

// Check for a collision between the 
  // bounding rects of two objects
  this.overlap = function(o1,o2) {
    return !((o1.y+o1.h-1<o2.y) || (o1.y>o2.y+o2.h-1) ||
             (o1.x+o1.w-1<o2.x) || (o1.x>o2.x+o2.w-1));
  };

// Find the first object that collides with obj
  // match against an optional type
  this.collide = function(obj,type) {
    return this.detect(function() {
      if(obj != this) {
       var col = (!type || this.type & type) && board.overlap(obj,this);
       return col ? this : false;
      }
    });
  };

};

var Sprite = function() { };

Sprite.prototype.setup = function(sprite,props) {
  this.sprite = sprite;
  this.merge(props);
  this.frame = this.frame || 0;
  this.w =  SpriteSheet.map[sprite].w;
  this.h =  SpriteSheet.map[sprite].h;
};

Sprite.prototype.merge = function(props) {
  if(props) {
    for (var prop in props) {
      this[prop] = props[prop];
    }
  }
};

Sprite.prototype.draw = function(ctx) {
  SpriteSheet.draw(ctx,this.sprite,this.x,this.y,this.frame);
};

Sprite.prototype.hit = function(damage) {
  this.board.remove(this);
};

var Level = function(levelData,callback) {
  this.levelData = [];
  for(var i =0; i<levelData.length; i++) {
    this.levelData.push(Object.create(levelData[i]));
  }
  this.t = 0;
  this.callback = callback;
};

Level.prototype.step = function(dt) {
  var idx = 0, remove = [], curShip = null;

// Update the current time offset
  this.t += dt * 1000;

//   Start, End,  Gap, Type,   Override
  // [ 0,     4000, 500, 'step', { x: 100 } ]
  while((curShip = this.levelData[idx]) && 
        (curShip[0] < this.t + 2000)) {
    // Check if we've passed the end time 
    if(this.t > curShip[1]) {
      remove.push(curShip);
    } else if(curShip[0] < this.t) {
      // Get the enemy definition blueprint
      var enemy = enemies[curShip[3]],
          override = curShip[4];

// Add a new enemy with the blueprint and override
      this.board.add(new Enemy(enemy,override));

// Increment the start time by the gap
      curShip[0] += curShip[2];
    }
    idx++;
  }

// Remove any objects from the levelData that have passed
  for(var i=0,len=remove.length;i<len;i++) {
    var remIdx = this.levelData.indexOf(remove[i]);
    if(remIdx != -1) this.levelData.splice(remIdx,1);
  }

// If there are no more enemies on the board or in 
  // levelData, this level is done
  if(this.levelData.length === 0 && this.board.cnt[OBJECT_ENEMY] === 0) {
    if(this.callback) this.callback();
  }

};

Level.prototype.draw = function(ctx) { };

var TouchControls = function() {

var gutterWidth = 10;
  var unitWidth = Game.width/5;
  var blockWidth = unitWidth-gutterWidth;

this.drawSquare = function(ctx,x,y,txt,on) {
    ctx.globalAlpha = on ? 0.9 : 0.6;
    ctx.fillStyle =  "#CCC";
    ctx.fillRect(x,y,blockWidth,blockWidth);

ctx.fillStyle = "#FFF";
    ctx.globalAlpha = 1.0;
    ctx.font = "bold " + (3*unitWidth/4) + "px arial";

var txtSize = ctx.measureText(txt);

ctx.fillText(txt, 
                 x+blockWidth/2-txtSize.width/2, 
                 y+3*blockWidth/4+5);
  };

this.draw = function(ctx) {
    ctx.save();

/*var yLoc = Game.height - unitWidth;
    this.drawSquare(ctx,gutterWidth,yLoc,"\u25C0", Game.keys['left']);
    this.drawSquare(ctx,unitWidth + gutterWidth,yLoc,"\u25B6", Game.keys['right']);
    this.drawSquare(ctx,4*unitWidth,yLoc,"A",Game.keys['fire']);*/
      
      var yLoc = Game.height - unitWidth*2;
	this.drawSquare(ctx,gutterWidth + unitWidth*0.5, yLoc - unitWidth, "\u25B2", Game.keys['up']); 
	this.drawSquare(ctx,gutterWidth + unitWidth*0.5, yLoc + unitWidth, "\u25BC", Game.keys['down']); 
    this.drawSquare(ctx,gutterWidth,yLoc,"\u25C0", Game.keys['left']);
    this.drawSquare(ctx,unitWidth + gutterWidth,yLoc,"\u25B6", Game.keys['right']);
    this.drawSquare(ctx,4*unitWidth,yLoc+unitWidth,"A",Game.keys['fire']);

ctx.restore();
  };

this.step = function(dt) { };

this.trackTouch = function(e) {
    /*var touch, x;*/
      var touch, x, y;

e.preventDefault();
    Game.keys['left'] = false;
    Game.keys['right'] = false;
    Game.keys['up'] = false;
	Game.keys['down'] = false;
    for(var i=0;i<e.targetTouches.length;i++) {
      touch = e.targetTouches[i];
      x = touch.pageX / Game.canvasMultiplier - Game.canvas.offsetLeft;
      y = Game.height - (touch.pageY / Game.canvasMultiplier - Game.canvas.offsetTop);
	  
	  if ( x < unitWidth*2 && y < unitWidth*3 )
	  {
		if ( y < unitWidth )
		{
			Game.keys['down'] = true;
		}
		else if ( y > unitWidth* 2 )
		{
			Game.keys['up'] = true;
		}
		else
		{
		  if(x < unitWidth) {
			Game.keys['left'] = true;
		  } 
		  if(x > unitWidth && x < 2*unitWidth) {
			Game.keys['right'] = true;
		  } 
		}
	  }
      /*if(x < unitWidth) {
        Game.keys['left'] = true;
      } 
      if(x > unitWidth && x < 2*unitWidth) {
        Game.keys['right'] = true;
      } */
    }

if(e.type == 'touchstart' || e.type == 'touchend') {
      for(i=0;i<e.changedTouches.length;i++) {
        touch = e.changedTouches[i];
        x = touch.pageX / Game.canvasMultiplier - Game.canvas.offsetLeft;
        if(x > 4 * unitWidth) {
          Game.keys['fire'] = (e.type == 'touchstart');
        }
      }
    }
  };

Game.canvas.addEventListener('touchstart',this.trackTouch,true);
  Game.canvas.addEventListener('touchmove',this.trackTouch,true);
  Game.canvas.addEventListener('touchend',this.trackTouch,true);

// For Android
  Game.canvas.addEventListener('dblclick',function(e) { e.preventDefault(); },true);
  Game.canvas.addEventListener('click',function(e) { e.preventDefault(); },true);

Game.playerOffset = unitWidth + 20;
};

var GamePoints = function() {
  Game.points = 0;

var pointsLength = 7;

this.draw = function(ctx) {
    ctx.save();
    ctx.font = "bold 20px Courier";
    ctx.fillStyle= "#33FF33";

var txt = "" + Game.points;
    var i = pointsLength - txt.length, zeros = "";
    while(i-- > 0) { zeros += "0"; }

ctx.fillText(zeros + txt,10,20);
    ctx.restore();

};

this.step = function(dt) { };
};

var sprites = {
 ship: { sx: 0, sy: 0, w: 37, h: 42, frames: 1 },
 missile: { sx: 0, sy: 30, w: 2, h: 10, frames: 1 },
 enemy_purple: { sx: 37, sy: 0, w: 42, h: 43, frames: 1 },
 enemy_bee: { sx: 79, sy: 0, w: 37, h: 43, frames: 1 },
 enemy_ship: { sx: 116, sy: 0, w: 42, h: 43, frames: 1 },
 enemy_circle: { sx: 158, sy: 0, w: 32, h: 33, frames: 1 },
 explosion: { sx: 0, sy: 64, w: 64, h: 64, frames: 12 },
 enemy_missile: { sx: 9, sy: 42, w: 3, h: 20, frame: 1, }
};

var enemies = {
  straight: { x: 0,   y: -50, sprite: 'enemy_ship', health: 10, 
              E: 100 },
  ltr:      { x: 0,   y: -100, sprite: 'enemy_purple', health: 10, 
              B: 75, C: 1, E: 100, missiles: 1  },
  circle:   { x: 250,   y: -50, sprite: 'enemy_circle', health: 10, 
              A: 0,  B: -100, C: 1, E: 20, F: 100, G: 1, H: Math.PI/2 },
  wiggle:   { x: 100, y: -50, sprite: 'enemy_bee', health: 20, 
              B: 50, C: 4, E: 100, firePercentage: 0.001, missiles: 1 },
  step:     { x: 0,   y: -50, sprite: 'enemy_circle', health: 10,
              B: 150, C: 1.2, E: 75 }
    
  //elipse:   { x: 250,   y: -50, sprite: 'enemy_circle', health: 10, 
  //            A: 0,  B: -100, C: 1, E: 20, F: 100, G: 1, H: Math.PI/2 },
};

var OBJECT_PLAYER = 1,
    OBJECT_PLAYER_PROJECTILE = 2,
    OBJECT_ENEMY = 4,
    OBJECT_ENEMY_PROJECTILE = 8,
    OBJECT_POWERUP = 16;

var startGame = function() {
  var ua = navigator.userAgent.toLowerCase();

// Only 1 row of stars
  if(ua.match(/android/)) {
    Game.setBoard(0,new Starfield(50,0.6,100,true));
  } else {
    Game.setBoard(0,new Starfield(20,0.4,100,true));
    Game.setBoard(1,new Starfield(50,0.6,100));
    Game.setBoard(2,new Starfield(100,1.0,50));
  }  
  Game.setBoard(3,new TitleScreen("Space Battles", 
                                  "Press space key to start playing",
                                  playGame));
};

var level1 = [
 // Start,   End, Gap,  Type,   Override

//[ 0,      4000, 400, 'circle' ],
  //[ 0,      4000,  500, 'step' ],
    
  [ 0,      5000,  3800, 'ltr',{ x: 50 } ],
  [ 7000,   13000, 2800, 'ltr' ],
  [ 15000,   21000, 1800, 'ltr' ],
  [ 23000,   33000, 800, 'ltr' ],
  [ 35000,   43000, 500, 'ltr',{ x: 20 } ],
    
    
    
    
  //[ 7000,  9000, 400, 'wiggle', { x: 200 }],
  //[ 10000,  16000, 400, 'circle' ],
 // [ 17800,  20000, 500, 'straight', { x: 50 } ],
  //[ 18200,  20000, 1500, 'straight', { x: 90 } ],
 // [ 20200,  23000, 1500, 'straight', { x: 10 } ],
  //[ 22000,  25000, 400, 'wiggle', { x: 200 }],
  //[ 23000,  26000, 1400, 'wiggle', { x: 100 }],
  //[ 28800,  30000, 500, 'straight', { x: 50 } ],
    
   // [ 0,      2000, 500, 'straight', { x: 20 } ],
 // [ 0,      4000, 500, 'straight', { x: 50 } ],
 // [ 0,      6000, 500, 'straight', { x: 100 } ],
 // [ 0,      8000, 1500, 'straight', { x: 150 } ],
 // [ 0,     10000, 1500, 'straight', { x: 200 } ],
    
// [ 0,       4000,  400, 'circle',  { y: 200 } ],
    
 // [ 0,       5000,  600, 'elipse', { x: 300 }  ],
    
  //[ 6000,    10000, 400, 'circle', { x: Math.floor(Math.random()) *10 }  ],
    
 // [ 12000,  16000, 400, 'circle' ],
  //[ 12000,  16000, 400, 'circle' ],
 // [ 12000,  16000, 400, 'circle' ],
    
 // [ 18000,  21000,  500, 'step' ],
    
 //  [ 10000,  16000, 400, 'circle' ],
  // [ 17800,  20000, 500, 'straight', { x: 50 } ],
  // [ 40200,  50000, 500, 'straight', { x: 190 } ],
  // [ 22000,  25000, 400, 'wiggle', { x: 150 }],
  // [ 22000,  25000, 400, 'wiggle', { x: 100 }]
];

var playGame = function() {
  var board = new GameBoard();
  board.add(new PlayerShip());
  board.add(new Level(level1,winGame));
  Game.setBoard(3,board);
  Game.setBoard(5,new GamePoints(0));
  Game.setBoard(6,new GameLives(3));
};

var winGame = function() {
  Game.setBoard(3,new TitleScreen("You win!", 
                                  "Press space key to play again",
                                  playGame));
};

var loseGame = function() {
  Game.setBoard(3,new TitleScreen("You lose!", 
                                  "Press space key to play again",
                                  playGame));
};

var Starfield = function(speed,opacity,numStars,clear) {

// Set up the offscreen canvas
  var stars = document.createElement("canvas");
  stars.width = Game.width; 
  stars.height = Game.height;
  var starCtx = stars.getContext("2d");

var offset = 0;

// If the clear option is set, 
  // make the background black instead of transparent
  if(clear) {
    starCtx.fillStyle = "#000";
    starCtx.fillRect(0,0,stars.width,stars.height);
  }

// Now draw a bunch of random 2 pixel
  // rectangles onto the offscreen canvas
  starCtx.fillStyle = "#FFF";
  starCtx.globalAlpha = opacity;
  for(var i=0;i<numStars;i++) {
    starCtx.fillRect(Math.floor(Math.random()*stars.width),
                     Math.floor(Math.random()*stars.height),
                     2,
                     2);
  }

// This method is called every frame
  // to draw the starfield onto the canvas
  this.draw = function(ctx) {
    var intOffset = Math.floor(offset);
    var remaining = stars.height - intOffset;

// Draw the top half of the starfield
    if(intOffset > 0) {
      ctx.drawImage(stars,
                0, remaining,
                stars.width, intOffset,
                0, 0,
                stars.width, intOffset);
    }

// Draw the bottom half of the starfield
    if(remaining > 0) {
      ctx.drawImage(stars,
              0, 0,
              stars.width, remaining,
              0, intOffset,
              stars.width, remaining);
    }
  };

// This method is called to update
  // the starfield
  this.step = function(dt) {
    offset += dt * speed;
    offset = offset % stars.height;
  };
};

var PlayerShip = function() { 
  this.setup('ship', { vx: 0, reloadTime: 0.25, maxVel: 200 });

this.reload = this.reloadTime;
  this.x = Game.width/2 - this.w / 2;
  this.y = Game.height - Game.playerOffset - this.h;

this.step = function(dt) {
    if(Game.keys['left']) { this.vx = -this.maxVel; }
    else if(Game.keys['right']) { this.vx = this.maxVel; }
    else { this.vx = 0; }

this.x += this.vx * dt;

if(this.x < 0) { this.x = 0; }
    else if(this.x > Game.width - this.w) { 
      this.x = Game.width - this.w;
    }

this.reload-=dt;
    if(Game.keys['fire'] && this.reload < 0) {
      Game.keys['fire'] = false;
      this.reload = this.reloadTime;

this.board.add(new PlayerMissile(this.x,this.y+this.h/2));
      this.board.add(new PlayerMissile(this.x+this.w,this.y+this.h/2));
    }
  };
};

PlayerShip.prototype = new Sprite();
PlayerShip.prototype.type = OBJECT_PLAYER;

//lives function
/*PlayerShip.prototype.hit = function(damage) {
  if(this.board.remove(this)) {
    loseGame();
  }
};*/

PlayerShip.prototype.hit = function(damage) {
  if ( --Game.lives <= 0 )
  {
	Game.lives = 0;
    if(this.board.remove(this))
	{
      this.board.add(new Explosion(this.x + this.w/2, 
                                   this.y + this.h/2,
								   loseGame()));
	}
  }
};

var PlayerMissile = function(x,y) {
  this.setup('missile',{ vy: -700, damage: 10 });
  this.x = x - this.w/2;
  this.y = y - this.h; 
};

PlayerMissile.prototype = new Sprite();
PlayerMissile.prototype.type = OBJECT_PLAYER_PROJECTILE;

PlayerMissile.prototype.step = function(dt)  {
  this.y += this.vy * dt;
  var collision = this.board.collide(this,OBJECT_ENEMY);
  if(collision) {
    collision.hit(this.damage);
    this.board.remove(this);
  } else if(this.y < -this.h) { 
      this.board.remove(this); 
  }
};

var Enemy = function(blueprint,override) {
  this.merge(this.baseParameters);
  this.setup(blueprint.sprite,blueprint);
  this.merge(override);
};

Enemy.prototype = new Sprite();
Enemy.prototype.type = OBJECT_ENEMY;

Enemy.prototype.baseParameters = { A: 0, B: 0, C: 0, D: 0, 
                                   E: 0, F: 0, G: 0, H: 0,
                                   t: 0, reloadTime: 0.75, 
                                   reload: 0 };

Enemy.prototype.step = function(dt) {
  this.t += dt;

this.vx = this.A + this.B * Math.sin(this.C * this.t + this.D);
  this.vy = this.E + this.F * Math.sin(this.G * this.t + this.H);

this.x += this.vx * dt;
  this.y += this.vy * dt;

var collision = this.board.collide(this,OBJECT_PLAYER);
  if(collision) {
    collision.hit(this.damage);
    this.board.remove(this);
  }

if(Math.random() < 0.01 && this.reload <= 0) {
    this.reload = this.reloadTime;
    if(this.missiles == 2) {
      this.board.add(new EnemyMissile(this.x+this.w-2,this.y+this.h));
      this.board.add(new EnemyMissile(this.x+2,this.y+this.h));
    } else {
      this.board.add(new EnemyMissile(this.x+this.w/2,this.y+this.h));
    }

}
  this.reload-=dt;

if(this.y > Game.height ||
     this.x < -this.w ||
     this.x > Game.width) {
       this.board.remove(this);
  }
};

Enemy.prototype.hit = function(damage) {
  this.health -= damage;
  if(this.health <=0) {
    if(this.board.remove(this)) {
      Game.points += this.points || 100;
      this.board.add(new Explosion(this.x + this.w/2, 
                                   this.y + this.h/2));
    }
  }
};

var EnemyMissile = function(x,y) {
  this.setup('enemy_missile',{ vy: 200, damage: 10 });
  this.x = x - this.w/2;
  this.y = y;
};

EnemyMissile.prototype = new Sprite();
EnemyMissile.prototype.type = OBJECT_ENEMY_PROJECTILE;

EnemyMissile.prototype.step = function(dt)  {
  this.y += this.vy * dt;
  var collision = this.board.collide(this,OBJECT_PLAYER)
  if(collision) {
    collision.hit(this.damage);
    this.board.remove(this);
  } else if(this.y > Game.height) {
      this.board.remove(this); 
  }
};

var Explosion = function(centerX,centerY) {
  this.setup('explosion', { frame: 0 });
  this.x = centerX - this.w/2;
  this.y = centerY - this.h/2;
};

Explosion.prototype = new Sprite();

Explosion.prototype.step = function(dt) {
  this.frame++;
  if(this.frame >= 12) {
    this.board.remove(this);
  }
};

window.addEventListener("load", function() {
  Game.initialize("game",sprites,startGame);
});

forked: Space Battles (adding lives)

/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
	display: block;
}
body {
	line-height: 1;
}
ol, ul {
	list-style: none;
}
blockquote, q {
	quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: '';
	content: none;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}

#container {
  padding-top:50px;
  margin:0 auto;
  width:480px;
}

canvas {
  background-color:black;

}

failled to add up and down functionality// forked from rolandas_kairys's "forked: Space Battles (adding lives) " http://jsdo.it/rolandas_kairys/9Lpz // forked from rolandas_kairys's "forked: Space Battles " http://jsdo.it/rolandas_kairys/cGkM ////// forked from rolandas_kairys's "Space Battles " http://jsdo.it/rolandas_kairys/dNmW (function() { var lastTime = 0; var vendors = ['ms', 'moz', 'webkit', 'o']; for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) { window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame']; window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] || window[vendors[x]+'CancelRequestAnimationFrame']; } if (!window.requestAnimationFrame) window.requestAnimationFrame = function(callback, element) { var currTime = new Date().getTime(); var timeToCall = Math.max(0, 16 - (currTime - lastTime)); var id = window.setTimeout(function() { callback(currTime + timeToCall); }, timeToCall); lastTime = currTime + timeToCall; return id; }; if (!window.cancelAnimationFrame) window.cancelAnimationFrame = function(id) { clearTimeout(id); }; }()); var Game = new function() { var boards = []; this.initialize = function(canvasElementId,sprite_data,callback) { this.canvas = document.getElementById(canvasElementId); this.playerOffset = 10; this.canvasMultiplier= 1; this.setupMobile(); this.width = this.canvas.width; this.height= this.canvas.height; this.ctx = this.canvas.getContext && this.canvas.getContext('2d'); if(!this.ctx) { return alert("Please upgrade your browser to play"); } this.setupInput(); this.loop(); if(this.mobile) { this.setBoard(4,new TouchControls()); } SpriteSheet.load(sprite_data,callback); }; var KEY_CODES = { 37:'left', 38:'up', 39:'right', 40:'down', 32 :'fire' }; this.keys = {}; this.setupInput = function() { window.addEventListener('keydown',function(e) { if(KEY_CODES[e.keyCode]) { Game.keys[KEY_CODES[e.keyCode]] = true; e.preventDefault(); } },false); window.addEventListener('keyup',function(e) { if(KEY_CODES[e.keyCode]) { Game.keys[KEY_CODES[e.keyCode]] = false; e.preventDefault(); } },false); }; var lastTime = new Date().getTime(); var maxTime = 1/30; // Game Loop this.loop = function() { var curTime = new Date().getTime(); requestAnimationFrame(Game.loop); var dt = (curTime - lastTime)/1000; if(dt > maxTime) { dt = maxTime; } for(var i=0,len = boards.length;i<len;i++) { if(boards[i]) { boards[i].step(dt); boards[i].draw(Game.ctx); } } lastTime = curTime; }; this.setBoard = function(num,board) { boards[num] = board; }; this.setupMobile = function() { var container = document.getElementById("container"), hasTouch = !!('ontouchstart' in window), w = window.innerWidth, h = window.innerHeight; if(hasTouch) { this.mobile = true; } if(screen.width >= 1280 || !hasTouch) { return false; } if(w > h) { alert("Please rotate the device and then click OK"); w = window.innerWidth; h = window.innerHeight; } container.style.height = h*2 + "px"; window.scrollTo(0,1); h = window.innerHeight + 2; container.style.height = h + "px"; container.style.width = w + "px"; container.style.padding = 0; if(h >= this.canvas.height * 1.75 || w >= this.canvas.height * 1.75) { this.canvasMultiplier = 2; this.canvas.width = w / 2; this.canvas.height = h / 2; this.canvas.style.width = w + "px"; this.canvas.style.height = h + "px"; } else { this.canvas.width = w; this.canvas.height = h; } this.canvas.style.position='absolute'; this.canvas.style.left="0px"; this.canvas.style.top="0px"; }; }; var SpriteSheet = new function() { this.map = { }; this.load = function(spriteData,callback) { this.map = spriteData; this.image = new Image(); this.image.onload = callback; this.image.src = 'http://jsrun.it/assets/k/V/e/v/kVevG.png'; }; this.draw = function(ctx,sprite,x,y,frame) { var s = this.map[sprite]; if(!frame) frame = 0; ctx.drawImage(this.image, s.sx + frame * s.w, s.sy, s.w, s.h, Math.floor(x), Math.floor(y), s.w, s.h); }; return this; }; var TitleScreen = function TitleScreen(title,subtitle,callback) { var up = false; this.step = function(dt) { if(!Game.keys['fire']) up = true; if(up && Game.keys['fire'] && callback) callback(); }; this.draw = function(ctx) { ctx.fillStyle = "#FFFF00"; ctx.font = "bold 37px Courier"; var measure = ctx.measureText(title); ctx.fillText(title,Game.width/2 - measure.width/2,Game.height/2); ctx.font = "bold 15px Courier"; var measure2 = ctx.measureText(subtitle); ctx.fillText(subtitle,Game.width/2 - measure2.width/2,Game.height/2 + 40); }; }; var GameBoard = function() { var board = this; this.objects = []; this.cnt = {}; // Add a new object to the object list this.add = function(obj) { obj.board=this; this.objects.push(obj); this.cnt[obj.type] = (this.cnt[obj.type] || 0) + 1; return obj; }; // Mark an object for removal this.remove = function(obj) { var idx = this.removed.indexOf(obj); if(idx == -1) { this.removed.push(obj); return true; } else { return false; } }; // Reset the list of removed objects this.resetRemoved = function() { this.removed = []; }; // Removed an objects marked for removal from the list this.finalizeRemoved = function() { for(var i=0,len=this.removed.length;i<len;i++) { var idx = this.objects.indexOf(this.removed[i]); if(idx != -1) { this.cnt[this.removed[i].type]--; this.objects.splice(idx,1); } } }; // Call the same method on all current objects this.iterate = function(funcName) { var args = Array.prototype.slice.call(arguments,1); for(var i=0,len=this.objects.length;i<len;i++) { var obj = this.objects[i]; obj[funcName].apply(obj,args); } }; // Find the first object for which func is true this.detect = function(func) { for(var i = 0,val=null, len=this.objects.length; i < len; i++) { if(func.call(this.objects[i])) return this.objects[i]; } return false; }; // Call step on all objects and them delete // any object that have been marked for removal this.step = function(dt) { this.resetRemoved(); this.iterate('step',dt); this.finalizeRemoved(); }; // Draw all the objects this.draw= function(ctx) { this.iterate('draw',ctx); }; // Check for a collision between the // bounding rects of two objects this.overlap = function(o1,o2) { return !((o1.y+o1.h-1<o2.y) || (o1.y>o2.y+o2.h-1) || (o1.x+o1.w-1<o2.x) || (o1.x>o2.x+o2.w-1)); }; // Find the first object that collides with obj // match against an optional type this.collide = function(obj,type) { return this.detect(function() { if(obj != this) { var col = (!type || this.type & type) && board.overlap(obj,this); return col ? this : false; } }); }; }; var Sprite = function() { }; Sprite.prototype.setup = function(sprite,props) { this.sprite = sprite; this.merge(props); this.frame = this.frame || 0; this.w = SpriteSheet.map[sprite].w; this.h = SpriteSheet.map[sprite].h; }; Sprite.prototype.merge = function(props) { if(props) { for (var prop in props) { this[prop] = props[prop]; } } }; Sprite.prototype.draw = function(ctx) { SpriteSheet.draw(ctx,this.sprite,this.x,this.y,this.frame); }; Sprite.prototype.hit = function(damage) { this.board.remove(this); }; var Level = function(levelData,callback) { this.levelData = []; for(var i =0; i<levelData.length; i++) { this.levelData.push(Object.create(levelData[i])); } this.t = 0; this.callback = callback; }; Level.prototype.step = function(dt) { var idx = 0, remove = [], curShip = null; // Update the current time offset this.t += dt * 1000; // Start, End, Gap, Type, Override // [ 0, 4000, 500, 'step', { x: 100 } ] while((curShip = this.levelData[idx]) && (curShip[0] < this.t + 2000)) { // Check if we've passed the end time if(this.t > curShip[1]) { remove.push(curShip); } else if(curShip[0] < this.t) { // Get the enemy definition blueprint var enemy = enemies[curShip[3]], override = curShip[4]; // Add a new enemy with the blueprint and override this.board.add(new Enemy(enemy,override)); // Increment the start time by the gap curShip[0] += curShip[2]; } idx++; } // Remove any objects from the levelData that have passed for(var i=0,len=remove.length;i<len;i++) { var remIdx = this.levelData.indexOf(remove[i]); if(remIdx != -1) this.levelData.splice(remIdx,1); } // If there are no more enemies on the board or in // levelData, this level is done if(this.levelData.length === 0 && this.board.cnt[OBJECT_ENEMY] === 0) { if(this.callback) this.callback(); } }; Level.prototype.draw = function(ctx) { }; var TouchControls = function() { var gutterWidth = 10; var unitWidth = Game.width/5; var blockWidth = unitWidth-gutterWidth; this.drawSquare = function(ctx,x,y,txt,on) { ctx.globalAlpha = on ? 0.9 : 0.6; ctx.fillStyle = "#CCC"; ctx.fillRect(x,y,blockWidth,blockWidth); ctx.fillStyle = "#FFF"; ctx.globalAlpha = 1.0; ctx.font = "bold " + (3*unitWidth/4) + "px arial"; var txtSize = ctx.measureText(txt); ctx.fillText(txt, x+blockWidth/2-txtSize.width/2, y+3*blockWidth/4+5); }; this.draw = function(ctx) { ctx.save(); /*var yLoc = Game.height - unitWidth; this.drawSquare(ctx,gutterWidth,yLoc,"\u25C0", Game.keys['left']); this.drawSquare(ctx,unitWidth + gutterWidth,yLoc,"\u25B6", Game.keys['right']); this.drawSquare(ctx,4*unitWidth,yLoc,"A",Game.keys['fire']);*/ var yLoc = Game.height - unitWidth*2; this.drawSquare(ctx,gutterWidth + unitWidth*0.5, yLoc - unitWidth, "\u25B2", Game.keys['up']); this.drawSquare(ctx,gutterWidth + unitWidth*0.5, yLoc + unitWidth, "\u25BC", Game.keys['down']); this.drawSquare(ctx,gutterWidth,yLoc,"\u25C0", Game.keys['left']); this.drawSquare(ctx,unitWidth + gutterWidth,yLoc,"\u25B6", Game.keys['right']); this.drawSquare(ctx,4*unitWidth,yLoc+unitWidth,"A",Game.keys['fire']); ctx.restore(); }; this.step = function(dt) { }; this.trackTouch = function(e) { /*var touch, x;*/ var touch, x, y; e.preventDefault(); Game.keys['left'] = false; Game.keys['right'] = false; Game.keys['up'] = false; Game.keys['down'] = false; for(var i=0;i<e.targetTouches.length;i++) { touch = e.targetTouches[i]; x = touch.pageX / Game.canvasMultiplier - Game.canvas.offsetLeft; y = Game.height - (touch.pageY / Game.canvasMultiplier - Game.canvas.offsetTop); if ( x < unitWidth*2 && y < unitWidth*3 ) { if ( y < unitWidth ) { Game.keys['down'] = true; } else if ( y > unitWidth* 2 ) { Game.keys['up'] = true; } else { if(x < unitWidth) { Game.keys['left'] = true; } if(x > unitWidth && x < 2*unitWidth) { Game.keys['right'] = true; } } } /*if(x < unitWidth) { Game.keys['left'] = true; } if(x > unitWidth && x < 2*unitWidth) { Game.keys['right'] = true; } */ } if(e.type == 'touchstart' || e.type == 'touchend') { for(i=0;i<e.changedTouches.length;i++) { touch = e.changedTouches[i]; x = touch.pageX / Game.canvasMultiplier - Game.canvas.offsetLeft; if(x > 4 * unitWidth) { Game.keys['fire'] = (e.type == 'touchstart'); } } } }; Game.canvas.addEventListener('touchstart',this.trackTouch,true); Game.canvas.addEventListener('touchmove',this.trackTouch,true); Game.canvas.addEventListener('touchend',this.trackTouch,true); // For Android Game.canvas.addEventListener('dblclick',function(e) { e.preventDefault(); },true); Game.canvas.addEventListener('click',function(e) { e.preventDefault(); },true); Game.playerOffset = unitWidth + 20; }; var GamePoints = function() { Game.points = 0; var pointsLength = 7; this.draw = function(ctx) { ctx.save(); ctx.font = "bold 20px Courier"; ctx.fillStyle= "#33FF33"; var txt = "" + Game.points; var i = pointsLength - txt.length, zeros = ""; while(i-- > 0) { zeros += "0"; } ctx.fillText(zeros + txt,10,20); ctx.restore(); }; this.step = function(dt) { }; }; var GameLives = function(lives) { Game.lives = lives; this.draw = function(ctx) { ctx.save(); ctx.font = "bold 20px Courier"; ctx.fillStyle = "#33FF33"; var txt = "Lives: " + Game.lives; ctx.fillText(txt, 10, 40); ctx.restore(); }; this.step = function(dt) {}; }; var sprites = { ship: { sx: 0, sy: 0, w: 37, h: 42, frames: 1 }, missile: { sx: 0, sy: 30, w: 2, h: 10, frames: 1 }, enemy_purple: { sx: 37, sy: 0, w: 42, h: 43, frames: 1 }, enemy_bee: { sx: 79, sy: 0, w: 37, h: 43, frames: 1 }, enemy_ship: { sx: 116, sy: 0, w: 42, h: 43, frames: 1 }, enemy_circle: { sx: 158, sy: 0, w: 32, h: 33, frames: 1 }, explosion: { sx: 0, sy: 64, w: 64, h: 64, frames: 12 }, enemy_missile: { sx: 9, sy: 42, w: 3, h: 20, frame: 1, } }; var enemies = { straight: { x: 0, y: -50, sprite: 'enemy_ship', health: 10, E: 100 }, ltr: { x: 0, y: -100, sprite: 'enemy_purple', health: 10, B: 75, C: 1, E: 100, missiles: 1 }, circle: { x: 250, y: -50, sprite: 'enemy_circle', health: 10, A: 0, B: -100, C: 1, E: 20, F: 100, G: 1, H: Math.PI/2 }, wiggle: { x: 100, y: -50, sprite: 'enemy_bee', health: 20, B: 50, C: 4, E: 100, firePercentage: 0.001, missiles: 1 }, step: { x: 0, y: -50, sprite: 'enemy_circle', health: 10, B: 150, C: 1.2, E: 75 } //elipse: { x: 250, y: -50, sprite: 'enemy_circle', health: 10, // A: 0, B: -100, C: 1, E: 20, F: 100, G: 1, H: Math.PI/2 }, }; var OBJECT_PLAYER = 1, OBJECT_PLAYER_PROJECTILE = 2, OBJECT_ENEMY = 4, OBJECT_ENEMY_PROJECTILE = 8, OBJECT_POWERUP = 16; var startGame = function() { var ua = navigator.userAgent.toLowerCase(); // Only 1 row of stars if(ua.match(/android/)) { Game.setBoard(0,new Starfield(50,0.6,100,true)); } else { Game.setBoard(0,new Starfield(20,0.4,100,true)); Game.setBoard(1,new Starfield(50,0.6,100)); Game.setBoard(2,new Starfield(100,1.0,50)); } Game.setBoard(3,new TitleScreen("Space Battles", "Press space key to start playing", playGame)); }; var level1 = [ // Start, End, Gap, Type, Override //[ 0, 4000, 400, 'circle' ], //[ 0, 4000, 500, 'step' ], [ 0, 5000, 3800, 'ltr',{ x: 50 } ], [ 7000, 13000, 2800, 'ltr' ], [ 15000, 21000, 1800, 'ltr' ], [ 23000, 33000, 800, 'ltr' ], [ 35000, 43000, 500, 'ltr',{ x: 20 } ], //[ 7000, 9000, 400, 'wiggle', { x: 200 }], //[ 10000, 16000, 400, 'circle' ], // [ 17800, 20000, 500, 'straight', { x: 50 } ], //[ 18200, 20000, 1500, 'straight', { x: 90 } ], // [ 20200, 23000, 1500, 'straight', { x: 10 } ], //[ 22000, 25000, 400, 'wiggle', { x: 200 }], //[ 23000, 26000, 1400, 'wiggle', { x: 100 }], //[ 28800, 30000, 500, 'straight', { x: 50 } ], // [ 0, 2000, 500, 'straight', { x: 20 } ], // [ 0, 4000, 500, 'straight', { x: 50 } ], // [ 0, 6000, 500, 'straight', { x: 100 } ], // [ 0, 8000, 1500, 'straight', { x: 150 } ], // [ 0, 10000, 1500, 'straight', { x: 200 } ], // [ 0, 4000, 400, 'circle', { y: 200 } ], // [ 0, 5000, 600, 'elipse', { x: 300 } ], //[ 6000, 10000, 400, 'circle', { x: Math.floor(Math.random()) *10 } ], // [ 12000, 16000, 400, 'circle' ], //[ 12000, 16000, 400, 'circle' ], // [ 12000, 16000, 400, 'circle' ], // [ 18000, 21000, 500, 'step' ], // [ 10000, 16000, 400, 'circle' ], // [ 17800, 20000, 500, 'straight', { x: 50 } ], // [ 40200, 50000, 500, 'straight', { x: 190 } ], // [ 22000, 25000, 400, 'wiggle', { x: 150 }], // [ 22000, 25000, 400, 'wiggle', { x: 100 }] ]; var playGame = function() { var board = new GameBoard(); board.add(new PlayerShip()); board.add(new Level(level1,winGame)); Game.setBoard(3,board); Game.setBoard(5,new GamePoints(0)); Game.setBoard(6,new GameLives(3)); }; var winGame = function() { Game.setBoard(3,new TitleScreen("You win!", "Press space key to play again", playGame)); }; var loseGame = function() { Game.setBoard(3,new TitleScreen("You lose!", "Press space key to play again", playGame)); }; var Starfield = function(speed,opacity,numStars,clear) { // Set up the offscreen canvas var stars = document.createElement("canvas"); stars.width = Game.width; stars.height = Game.height; var starCtx = stars.getContext("2d"); var offset = 0; // If the clear option is set, // make the background black instead of transparent if(clear) { starCtx.fillStyle = "#000"; starCtx.fillRect(0,0,stars.width,stars.height); } // Now draw a bunch of random 2 pixel // rectangles onto the offscreen canvas starCtx.fillStyle = "#FFF"; starCtx.globalAlpha = opacity; for(var i=0;i<numStars;i++) { starCtx.fillRect(Math.floor(Math.random()*stars.width), Math.floor(Math.random()*stars.height), 2, 2); } // This method is called every frame // to draw the starfield onto the canvas this.draw = function(ctx) { var intOffset = Math.floor(offset); var remaining = stars.height - intOffset; // Draw the top half of the starfield if(intOffset > 0) { ctx.drawImage(stars, 0, remaining, stars.width, intOffset, 0, 0, stars.width, intOffset); } // Draw the bottom half of the starfield if(remaining > 0) { ctx.drawImage(stars, 0, 0, stars.width, remaining, 0, intOffset, stars.width, remaining); } }; // This method is called to update // the starfield this.step = function(dt) { offset += dt * speed; offset = offset % stars.height; }; }; var PlayerShip = function() { this.setup('ship', { vx: 0, reloadTime: 0.25, maxVel: 200 }); this.reload = this.reloadTime; this.x = Game.width/2 - this.w / 2; this.y = Game.height - Game.playerOffset - this.h; this.step = function(dt) { if(Game.keys['left']) { this.vx = -this.maxVel; } else if(Game.keys['right']) { this.vx = this.maxVel; } else { this.vx = 0; } this.x += this.vx * dt; if(this.x < 0) { this.x = 0; } else if(this.x > Game.width - this.w) { this.x = Game.width - this.w; } this.reload-=dt; if(Game.keys['fire'] && this.reload < 0) { Game.keys['fire'] = false; this.reload = this.reloadTime; this.board.add(new PlayerMissile(this.x,this.y+this.h/2)); this.board.add(new PlayerMissile(this.x+this.w,this.y+this.h/2)); } }; }; PlayerShip.prototype = new Sprite(); PlayerShip.prototype.type = OBJECT_PLAYER; //lives function /*PlayerShip.prototype.hit = function(damage) { if(this.board.remove(this)) { loseGame(); } };*/ PlayerShip.prototype.hit = function(damage) { if ( --Game.lives <= 0 ) { Game.lives = 0; if(this.board.remove(this)) { this.board.add(new Explosion(this.x + this.w/2, this.y + this.h/2, loseGame())); } } }; var PlayerMissile = function(x,y) { this.setup('missile',{ vy: -700, damage: 10 }); this.x = x - this.w/2; this.y = y - this.h; }; PlayerMissile.prototype = new Sprite(); PlayerMissile.prototype.type = OBJECT_PLAYER_PROJECTILE; PlayerMissile.prototype.step = function(dt) { this.y += this.vy * dt; var collision = this.board.collide(this,OBJECT_ENEMY); if(collision) { collision.hit(this.damage); this.board.remove(this); } else if(this.y < -this.h) { this.board.remove(this); } }; var Enemy = function(blueprint,override) { this.merge(this.baseParameters); this.setup(blueprint.sprite,blueprint); this.merge(override); }; Enemy.prototype = new Sprite(); Enemy.prototype.type = OBJECT_ENEMY; Enemy.prototype.baseParameters = { A: 0, B: 0, C: 0, D: 0, E: 0, F: 0, G: 0, H: 0, t: 0, reloadTime: 0.75, reload: 0 }; Enemy.prototype.step = function(dt) { this.t += dt; this.vx = this.A + this.B * Math.sin(this.C * this.t + this.D); this.vy = this.E + this.F * Math.sin(this.G * this.t + this.H); this.x += this.vx * dt; this.y += this.vy * dt; var collision = this.board.collide(this,OBJECT_PLAYER); if(collision) { collision.hit(this.damage); this.board.remove(this); } if(Math.random() < 0.01 && this.reload <= 0) { this.reload = this.reloadTime; if(this.missiles == 2) { this.board.add(new EnemyMissile(this.x+this.w-2,this.y+this.h)); this.board.add(new EnemyMissile(this.x+2,this.y+this.h)); } else { this.board.add(new EnemyMissile(this.x+this.w/2,this.y+this.h)); } } this.reload-=dt; if(this.y > Game.height || this.x < -this.w || this.x > Game.width) { this.board.remove(this); } }; Enemy.prototype.hit = function(damage) { this.health -= damage; if(this.health <=0) { if(this.board.remove(this)) { Game.points += this.points || 100; this.board.add(new Explosion(this.x + this.w/2, this.y + this.h/2)); } } }; var EnemyMissile = function(x,y) { this.setup('enemy_missile',{ vy: 200, damage: 10 }); this.x = x - this.w/2; this.y = y; }; EnemyMissile.prototype = new Sprite(); EnemyMissile.prototype.type = OBJECT_ENEMY_PROJECTILE; EnemyMissile.prototype.step = function(dt) { this.y += this.vy * dt; var collision = this.board.collide(this,OBJECT_PLAYER) if(collision) { collision.hit(this.damage); this.board.remove(this); } else if(this.y > Game.height) { this.board.remove(this); } }; var Explosion = function(centerX,centerY) { this.setup('explosion', { frame: 0 }); this.x = centerX - this.w/2; this.y = centerY - this.h/2; }; Explosion.prototype = new Sprite(); Explosion.prototype.step = function(dt) { this.frame++; if(this.frame >= 12) { this.board.remove(this); } }; window.addEventListener("load", function() { Game.initialize("game",sprites,startGame); }); <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title> Space Battles </title> <meta content="width=device-width, user-scalable=0, minimum-scale=1.0, maximum-scale=1.0" name="viewport" > <meta content="yes" name="apple-mobile-web-app-capable" > <meta content="black" name="apple-mobile-web-app-status-bar-style" > </head> <body> <div id="container"> <canvas id="game" height="480" width="320"> </canvas> </div> </body> </html> /* http://meyerweb.com/eric/tools/css/reset/ v2.0 | 20110126 License: none (public domain) */ html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video { margin: 0; padding: 0; border: 0; font-size: 100%; font: inherit; vertical-align: baseline; } /* HTML5 display-role reset for older browsers */ article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section { display: block; } body { line-height: 1; } ol, ul { list-style: none; } blockquote, q { quotes: none; } blockquote:before, blockquote:after, q:before, q:after { content: ''; content: none; } table { border-collapse: collapse; border-spacing: 0; } #container { padding-top:50px; margin:0 auto; width:480px; } canvas { background-color:black; }

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forked: Space Battles (adding lives)

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