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game2.html
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<!DOCTYPE html>
<html>
<head>
<title>Classic Bricks Game</title>
<style type="text/css">
#board
{
float:left;
outline:black solid thin;
}
</style>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.6.2.js"></script>
<script type="text/javascript">
$(document).ready(function(){
initialScreen();
$(document).keydown(onKeyDown);
$(document).keyup(onKeyUp);
});
</script>
</head>
<body>
<div id="container">
<canvas id="board" height="500" width="500">
Your browser does not support HTML5 canvas
</canvas>
</div>
</body>
<script type="text/javascript">
var canvas,context;
var ballx,bally;
var xunits=0;
var yunits=0;
var radians=0;
var speed;
var angle;
var moveRight,moveLeft;
const BARHEIGHT=10;
const BARWIDTH=120;
const RADIUS=15;
const BRICKROWS=5;
const BRICKCOLUMNS=10;
const BRICKHEIGHT=20;
const BRICKWIDTH=50;
const NUMBEROFBRICKS=50;
var barx,bary;
var gameOver=false;
var bricks=new Array();
function initialScreen()
{
canvas=document.getElementById("board");
context=canvas.getContext("2d");
//starting positions of the ball and the bar
ballx=canvas.width/2;
bally=canvas.height-30;
barx=canvas.width/2-60;
bary=canvas.height-10;
drawBricks();
drawGame();
speed = 5;
angle=35;
updateBall();
setInterval(drawGame, 33);
}
function drawGame()
{
if(!gameOver)
{
//clear the earlier drawing
context.clearRect(0, 0, canvas.width, canvas.height);
//draw the ball
ballx+=xunits;
bally+=yunits;
context.fillStyle="black";
context.beginPath();
context.arc(ballx,bally,RADIUS,0,Math.PI*2,true);
context.closePath();
context.fill();
console.log(ballTouchesBrick());
//draw the bar everytime we draw the game board
drawBar();
//draw the bricks
reDrawBricks();
var state=ballTouchesBrick();
//ball bouncing off the walls
if(state)
{
angle = 360 - angle;
updateBall();
}
else if (ballx < 0 || ballx>canvas.width ) //side walls
{
angle = 180 - angle;
updateBall();
}
else if(bally< 0)//top wall
{
angle = 360 - angle;
updateBall();
}
else if(ballTouchesBar())//ball bounce on touching the bar
{
angle=360-angle;
updateBall();
}
else if(bally>canvas.width)
{
drawGameOver();
}
}
}
function updateBall()
{
radians = angle * Math.PI/ 180;
xunits = Math.cos(radians) * speed;
yunits = Math.sin(radians) * speed;
}
function drawBar()
{
context.fillStyle="orange";
if(moveRight)
{
if(barx+BARWIDTH<canvas.width)
{
barx+=5;
}
}
else if(moveLeft)
{
if(barx>0)
{
barx-=5;
}
}
context.fillRect(barx,bary,BARWIDTH,BARHEIGHT);
}
function drawBricks()
{
context.strokeStyle="gray";
context.fillStyle="red";
var posx=0;
var posy=0;
for(var j=0;j<BRICKROWS;j++)
{
for(var k=0;k<BRICKCOLUMNS;k++)
{
context.fillRect(posx,posy,BRICKWIDTH,BRICKHEIGHT);
context.strokeRect(posx,posy,BRICKWIDTH,BRICKHEIGHT);
bricks.push({x:posx,y:posy,broken:false});
posx+=BRICKWIDTH;
}
posy+=BRICKHEIGHT;
posx=0;
}
}
//event handler for key press
function onKeyDown(event)
{
if(event.keyCode==39)
{
moveRight=true;
}
else if(event.keyCode==37)
{
moveLeft=true;
}
}
//event handler for key release
function onKeyUp(event)
{
if(event.keyCode==39)
{
moveRight=false;
}
else if(event.keyCode==37)
{
moveLeft=false;
}
}
//to check if the ball touches the bar
function ballTouchesBar()
{
if((ballx+RADIUS>barx-1)&&(ballx+RADIUS<barx+BARWIDTH+1))
{
if((bally+RADIUS>bary-1)&&(bally+RADIUS<bary+BARHEIGHT+1))
{
return true;
}
else return false;
}
else return false;
}
//to check if the ball has broken a brick
function ballTouchesBrick()
{
var i;
for(i=bricks.length-1;i>=0;i--)
{
if((bally+RADIUS>bricks[i].y-1)&&(bally+RADIUS<bricks[i].y+BRICKHEIGHT+1))
{
if((ballx+RADIUS>bricks[i].x-1)&&(ballx+RADIUS<bricks[i].x+BRICKWIDTH+1))
{
if(!bricks[i].broken)
{
bricks[i].broken=true;
//return true;
break;
}
}
}
}
if(i>0)return true;
}
//to draw the bricks again
function reDrawBricks()
{
context.strokeStyle="gray";
context.fillStyle="red";
for(var i=0;i<bricks.length;i++)
{
if(!bricks[i].broken)
{
context.fillRect(bricks[i].x,bricks[i].y,BRICKWIDTH,BRICKHEIGHT);
context.strokeRect(bricks[i].x,bricks[i].y,BRICKWIDTH,BRICKHEIGHT);
}
}
}
//to display when the game is over
function drawGameOver()
{
gameOver=true;
context.clearRect(0, 0, canvas.width, canvas.height);
context.font = "bold 24px sans-serif";
context.fillText("GAME OVER!!",10,canvas.height/2);
}
</script>
</html>