Space-Invaders-HTML-5/index.html at master · Joeynoh/Space-Invaders-HTML-5 · GitHub

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<!--
File index.html
implemented by Adelino Lobão
09/01/2012
-->
<html>
	<head>
		<title>Space Invaders</title>
		<link rel="stylesheet" href="style/style_space.css" />
		<link rel="stylesheet" href="style/normalize.css"/>

    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
	</head>
	<body>
		<canvas id="content"></canvas>
<script type="text/javascript">

		;$(function(){

			const FRAME_RATE = 50;

			var $window = $(window),
					w = $window.width(),
					h = $window.height(),

					gameLoop,
					intervalTime = 1000 / FRAME_RATE,
			 		previousAction = 'left',
					canvas = document.getElementById("content"),
					context = canvas.getContext("2d"),
					player = new Player(),
					lasers = [],
					enemies = [];

			canvas.width = w;
			canvas.height = h;

/**
 * Class Enemy
 * @param initPosX - initial position xx
 * @param initPosY - initial position yy
 */
function Enemy(initPosX, initPosY) {

	//image src
	var imgSrc = 'script/images/enemy.png';
	//width
	this.width = 22;
	//height
	this.height = 16;

	//enemy sprite
	var sprite = new Sprite(3);
	//set image and size
	sprite.initImage(imgSrc, this.width, this.height);
	//set initial position of the sprite
	sprite.initPosition(initPosX, initPosY);

	//initial action
	var currentAction = 'left';

	/**
	 * Draws the enemy sprite
	 */
	this.draw = function() {
		sprite.draw();
	}

	/**
	 * Simulates one step of the enemy
	 * @param action - indicates the action of the enemy
	 */
	this.step = function() {
		if(currentAction == 'left') {
			sprite.moveLeft();
		}else if(currentAction == 'right') {
			sprite.moveRight();
		}
	}

	/**
	 * Simulates one jump forward
	 */
	this.jump = function() {
		if(currentAction == 'left') {
			currentAction = 'right';
		}else {
			currentAction = 'left';
		}
		sprite.moveFront();
	}

	/**
	 * Verifies if the enemies needs to change of action
	 */
	this.checkStep = function() {
		if(sprite.x <= 10 && currentAction == 'left') {
			currentAction = 'right';
		}else if(sprite.x >= (w - 10) && currentAction == 'right') {
			currentAction = 'left';
		}
		return currentAction;
	}

	/**
	  * Return the position xx of the enemy
	  */
	 this.getPositionX = function() {
	 	return sprite.x;
	 }

	 /**
	  * Return the position yy of the enemy
	  */
	 this.getPositionY = function() {
	 	return sprite.y;
	 }
}

 /**
  * Class Sprite
  * @param increment - is the increment added to the sprite
  */
function Sprite(increment) {
	//increment
	var increment = increment;

	/**
	 * Initialize sprite image and size
	 * @param src - image source
	 * @param widht - image width
	 * @param height - image height
	 */
	this.initImage = function(src, width, height) {
		//set image sprite
		this.image = new Image();
		//set image source
		this.image.src = src;
		//set image width
		this.width = width;
		//set image height
		this.height = height;
	}
	/**
	 * Initialize the sprite position
	 * @param initPosX - initial position xx
	 * @param initPosY - initial position yy
	 */
	this.initPosition = function(initPosX, initPosY) {
		this.x = initPosX;
		this.y = initPosY;
	}

	/**
	 * Set sprite position
	 * @param posX - position xx
	 * @param posY - position yy
	 */
	this.setPosition = function(posX, posY) {
		if((posX > 0) && (posX < w)) { //check the position boundaries
			this.x = posX;
	 		this.y = posY;
		}
	}

	/**
	 * Draw sprite
	 */
	this.draw = function() {
		//removes image size
		var positionX = this.x - (this.width / 2);
		var positionY = this.y - (this.height / 2);
		//draw image
		context.drawImage(this.image, positionX, positionY);
	}

	/**
	 * Move sprite to the left
	 */
	this.moveLeft = function() {
		this.setPosition(this.x - increment, this.y);
	}

	/**
	 * Move sprite to the right
	 */
	this.moveRight = function() {
		this.setPosition(this.x + increment, this.y);
	}

	/**
	 * Move sprite to the front
	 */
	this.moveFront = function() {
		this.setPosition(this.x, this.y + (increment * 3));
	}
}

/**
 * Class Laser
 * @param player - player object
 */
function Laser(player) {
	//increment
	const INCREMENT = 20;
	//laser width
	this.width = 5;
	//laser height
	this.height = 5;
	//intial position xx
	this.x = player.getPositionX() - 2;
	//initial position yy
	this.y = player.getPositionY() - 15;

	/**
	 * Draw the laser
	 */
	this.draw = function() {
		//context style
		context.fillStyle = "white";
		//draw the rectangle laser
		context.fillRect(this.x, this.y, this.width, this.height);
	}

	/**
	 * Simulate one step of the laser and verifies if it
	 * already reach the top of the screen
	 */
	this.step = function() {
		this.y = this.y - INCREMENT;
		if(this.y <= 0)	return true;
		return false;
	}

	/**
	  * Return the position xx of the laser
	  */
	 this.getPositionX = function() {
	 	return this.x;
	 }

	 /**
	  * Return the position yy of the laser
	  */
	 this.getPositionY = function() {
	 	return this.y;
	 }
}

 /**
  * Class Player
  */
function Player() {

	//image src
	var imgSrc = 'script/images/ship.png';
	//width
	this.width = 26;
	//height
	this.height = 16;

	//indicates if the sprite is moving left
	this.movingLeft = false;
	//indicates if the sprite is moving right
	this.movingRight = false;

	//create the player sprite
	var sprite = new Sprite(20);
	//set sprite image and size
	sprite.initImage('script/images/ship.png', 26, 16);
	//set initial position of the sprite
	sprite.initPosition(w / 2, h - 100);

	/**
	 * Draw the player
	 */
	this.draw = function() {
		sprite.draw();
	}

	/**
	 * Moves the player character to left
	 */
	this.moveLeft = function() {
		sprite.moveLeft();
	}

	/**
	 * Moves the player character to right
	 */
	 this.moveRight = function() {
	 	sprite.moveRight();
	 }

	 /**
	  * Return the position xx of the player
	  */
	 this.getPositionX = function() {
	 	return sprite.x;
	 }

	 /**
	  * Return the position yy of the player
	  */
	 this.getPositionY = function() {
	 	return sprite.y;
	 }
}

			var f = {

				init: function(){

					$window.on({
						keydown: function(event){
							switch(event.keyCode) {
								case 37:
									player.movingLeft = true;
									break;
								case 39:
									player.movingRight = true;
									break;
								case 32:
									lasers[lasers.length] = new Laser(player);
									break;
							}
						},
						keyup: function(event){
							switch(event.keyCode) {
								case 37:
									player.movingLeft = false;
									break;
								case 39:
									player.movingRight = false;
									break;
							}
						}
					});

					f.createEnemies(18, 5);
					f.run();
				},

				run: function(){
					f.drawWindow();
					player.draw();
					f.draw();
					f.detectColisions();
					gameLoop = setTimeout(f.run, intervalTime);
				},

				draw: function() {
					var currentAction = '';

					if(player.movingLeft)	player.moveLeft();
					else if(player.movingRight)	player.moveRight();

					for(index in lasers) {
						lasers[index].draw();
						if(lasers[index].step()){
							lasers.splice(index, 1);
						}
					}

					for(index in enemies) {
						currentAction = enemies[index].checkStep();
						if(currentAction != previousAction){
							break;
						}
					}

					for(index in enemies) {
						enemies[index].draw();
						if(currentAction != previousAction){
							enemies[index].jump();
						}else{
							enemies[index].step();
						}
					}
					previousAction = currentAction;
				},

				detectColisions: function() {
					for(indexLaser in lasers) {
						for(indexEnemy in enemies) {
							if(f.colisionHandler(lasers[indexLaser], enemies[indexEnemy])) {
								lasers.splice(indexLaser, 1);
								enemies.splice(indexEnemy, 1);
								break;
							}
						}
					}
				},

				colisionHandler: function(obj1, obj2){
					if((obj1.getPositionY() + obj1.height) < obj2.getPositionY()) {
						return false;
					}
					else if(obj1.getPositionY() > (obj2.getPositionY() + obj2.height)) {
						return false;
					}
					else if((obj1.getPositionX() + obj1.width) < obj2.getPositionX()) {
						return false;
					}
					else if(obj1.getPositionX() > (obj2.getPositionX() + obj2.width)) {
						return false;
					}
					return true;
				},

				drawWindow: function() {
					context.fillStyle = '#2fbee2';
					context.clearRect(0, 0, w, h);
					context.beginPath();
					context.rect(0, 0, w, h);
					context.closePath();
					context.fill();
				},

				createEnemies: function(numRows, numCols) {

					var refPosX = (w / 2),
							refPosY = (h / 10);

					var fof = [
						[0, 0], [2, 0], [0, 1], [2, 1], [0, 2], [1, 2], [2, 2], [2, 3], [2, 4], // 4
						[4, 0], [5, 0], [6, 0], [4, 1], [6, 1], [4, 2], [6, 2], [4, 3], [6, 3], [4, 4], [5, 4], [6, 4], // 0
						[8, 0], [10, 0], [8, 1], [10, 1], [8, 2], [9, 2], [10, 2], [10, 3], [10, 4] // 4
					];

					for(var i = 0; i < fof.length; i++){
						var posX = refPosX + (40 * fof[i][0]);
						var posY = refPosY + (40 * fof[i][1]);
						enemies[enemies.length] = new Enemy(posX, posY);
					}

					/*for(var x = 0;  x < numRows; ++x) {
						for(var y = 0; y < numCols; ++y) {
							var posX = refPosX + (40 * x);
							var posY = refPosY + (40 * y);
							if(x % 2 == 0){
								enemies[enemies.length] = new Space(posX, posY);
							}else{
								enemies[enemies.length] = new Enemy(posX, posY);
							}
						}
					}*/
				}

			};

			f.init();

		});

		</script>
	</body>
</html>