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<!DOCTYPE html>
<html lang="en">
<head>
<meta name="Pong" content="text/html;charset-utf-8">
<meta content="utf-8" http-equiv="encoding">
<title>"Pong" by Strohmer</title>
</head>
<body>
<center>
<h2>Pong</h2>
<h3>< /> w/ ♥ by Jason @ <a href="http://www.github.com/strohmer"> Github </a></h3><br>
<!-- Create the black background for the game -->
<canvas id="pong" width="600" height="500"></canvas>
<!-- Javascript -->
<script type="text/javascript">
var canvas;
var canvasMaterial;
var paddle1v, paddle2v, p1score = 0, p2score = 0;
var ballX = 75, ballY = 100;
var ballVelX = 6, ballVelY = 6;
var endGame = false;
var winner = "";
var winmessage = winner + "wins!";
const PADDLEHEIGHT = 100;
const PADDLETHICK = 10;
const AISPEED = 6;
const WINSCORE = 1;
window.onload = function() {
//Make sure this is loading
console.log("A tisket, a tasket, a green and yellow basket.");
canvas = document.getElementById('pong');
canvasMaterial = canvas.getContext('2d');
paddle2v = (canvas.height/2) - (PADDLEHEIGHT/2);
canvas.addEventListener('mousemove', function(evt) {
var mousePosition = getMousePosition(evt);
paddle1v = mousePosition.y - (PADDLEHEIGHT/2);
} );
//Update the game at 30 frames per second
setInterval(function() {
updateDirections();
drawGame();
}, 1000/30);
}
function makeCircle (centerX, centerY, radius, color) {
canvasMaterial.fillStyle = color;
canvasMaterial.beginPath();
canvasMaterial.arc(centerX,centerY,radius,0,Math.PI*2,false);
canvasMaterial.fill();
}
function makeRectangle (toplX, toplY, width, height, color) {
canvasMaterial.fillStyle = color;
canvasMaterial.rect(toplX, toplY, width, height);
canvasMaterial.fill();
}
//Reverse ball's direction if it reaches any edge
function updateDirections () {
if (endGame) {
return;
}
AIPaddle();
//Player's Side
if (ballX < 0) {
if (ballY == paddle1v) {
ballVelX *= -1;
ballVelY *= -5;
} else if (ballY > paddle1v+1 && ballY < paddle1v+9) {
ballVelX *= -1;
ballVelY *= -4.15;
} else if (ballY > paddle1v+10 && ballY < paddle1v+19) {
ballVelX *= -1;
ballVelY *= -3.32;
} else if (ballY > paddle1v+20 && ballY < paddle1v+29) {
ballVelX *= -1;
ballVelY *= -2.49;
} else if (ballY > paddle1v+30 && ballY < paddle1v+39) {
ballVelX *= -1;
ballVelY *= -1.66;
} else if (ballY > paddle1v+40 && ballY < paddle1v+49) {
ballVelX *= -1;
ballVelY *= -0.83;
} else if (ballY == paddle1v + (PADDLEHEIGHT/2)) {
ballVelX *= -1;
ballVelY *= 0;
} else if (ballY > paddle1v+51 && ballY < paddle1v+59) {
ballVelX *= -1;
ballVelY *= 0.83;
} else if (ballY > paddle1v+60 && ballY < paddle1v+69) {
ballVelX *= -1;
ballVelY *= 1.66;
} else if (ballY > paddle1v+70 && ballY < paddle1v+79) {
ballVelX *= -1;
ballVelY *= 2.49;
} else if (ballY > paddle1v+80 && ballY < paddle1v+89) {
ballVelX *= -1;
ballVelY *= 3.32;
} else if (ballY > paddle1v+90 && ballY < paddle1v+99) {
ballVelX *= -1;
ballVelY *= 4.15;
} else if (ballY == paddle1v + PADDLEHEIGHT) {
ballVelX *= -1;
ballVelY *= 5;
} else {
p2score++;
resetBall();
}
}
//AI Side
if (ballX > canvas.width) {
if (ballY > paddle2v && ballY < paddle2v+PADDLEHEIGHT) {
ballVelX *= -1;
} else {
p1score++;
resetBall();
}
}
//Bounce off the top and bottom of arena
if (ballY > canvas.height || ballY < 0) {
ballVelY *= -1;
}
//Update ball's position
ballX += ballVelX;
ballY += ballVelY;
}
//Grab the mouse's coordinates
function getMousePosition(evt) {
var rect = canvas.getBoundingClientRect(), root = document.documentElement;
var mouseX = evt.clientX - rect.left - root.scrollLeft;
var mouseY = evt.clientY - rect.top - root.scrollTop;
return {
x:mouseX, y:mouseY
};
}
//The artificial intelligence for player 2
function AIPaddle() {
if (ballY > paddle2v+20 && ballY < paddle2v+80) {
//do nothing
} else if (ballY < paddle2v+(PADDLEHEIGHT/2)) {
paddle2v -= AISPEED;
} else if (ballY > paddle2v+(PADDLEHEIGHT/2)) {
paddle2v += AISPEED;
}
}
function resetBall() {
if (p1score == WINSCORE || p2score == WINSCORE) {
if (p1score == WINSCORE) {
winner = "left";
} else {
winner = "right";
}
endGame = true;
} else {
ballVelX = 6;
ballVelY = 6;
ballX = canvas.width/2;
ballY = canvas.height/2;
}
}
function drawGame() {
//Draw the background
canvasMaterial.fillStyle = 'black';
canvasMaterial.fillRect(0, 0, canvas.width, canvas.height);
if (endGame) {
canvasMaterial.fillStyle = "#ffffff";
canvasMaterial.textAlign = 'center';
canvasMaterial.fillText(winmessage,canvas.width/4,canvas.height/6);
} else {
//Draw the ball
makeCircle(ballX,ballY,10,'white');
//Draw the paddles - player paddle
makeRectangle (0,paddle1v,PADDLETHICK,100,'white');
//AI paddle
makeRectangle (canvas.width-PADDLETHICK,paddle2v,PADDLETHICK,100,'white');
//Scores
canvasMaterial.fillStyle = "#ffffff";
canvasMaterial.fillText(p1score,canvas.width/4,canvas.height/6);
canvasMaterial.fillText(p2score,canvas.width/4 + canvas.width/2,canvas.height/6);
}
}
</script>
</center>
</body>
</html>
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