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arcade_tennis.html
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arcade_tennis.html
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<html>
<head>
<title>Arcade Tennis</title>
<style type="text/css">
body{
background-image: url('images/brick.jpg');
}
h1{
margin: 20px;
margin-left: 290px;
}
h1 span{
background-color: lime;
padding: 10px;
border-radius: 10px;
}
</style>
</head>
<body style="margin-left: 250px;margin-left: 250px;">
<h1><span>Arcade Tennis</span></h1>
<canvas id="gameCanvas" width="800" height="600"></canvas>
<script>
var canvas;
var canvasContext;
var ballX=50;
var ballY=50;
var ballSpeedX=15;
var ballSpeedY=4;
var paddle1Y=250;
var paddle2Y=250;
const PADDLE_HEIGHT=100;
const PADDLE_THICKNESS=10;
const WINNING_SCORE=3;
var player1Score=0;
var player2Score=0;
var showingWinningScreen=false;
function calculateMousePos(evt)
{
var rect=canvas.getBoundingClientRect();
var root=document.documentElement;
var mouseX=evt.clientX-rect.left-root.scrollLeft;
var mouseY=evt.clientY-rect.top-root.scrollTop;
return {
x:mouseX,
y:mouseY
};
}
function handleMouseClick(evt)
{
if(showingWinningScreen)
{
player1Score=0;
player2Score=0;
showingWinningScreen=false;
}
}
window.onload= function()
{
canvas = document.getElementById('gameCanvas');
canvasContext = canvas.getContext('2d');
canvasContext.font="40px Arial"; // font
var framesPerSecond=25;
setInterval(function(){
moveEverything();
drawEverything();
}
, 1000/framesPerSecond);
canvas.addEventListener('mousedown',handleMouseClick);
canvas.addEventListener('mousemove',
function(evt) {
var mousePos=calculateMousePos(evt);
paddle1Y=mousePos.y-(PADDLE_HEIGHT/2); // change paddles here
});
}
function ballReset()
{
if(player1Score==WINNING_SCORE || // Checking the score
player2Score==WINNING_SCORE)
{
showingWinningScreen=true;
}
ballSpeedX=-ballSpeedX;
ballX=canvas.width/2;
ballY=canvas.height/2;
}
function computerMovement() //AI
{
var paddle2YCenter=paddle2Y+(PADDLE_HEIGHT/2);
if(paddle2YCenter < ballY-35)
{ paddle2Y+=6 }
else if(paddle2YCenter > ballY+35)
{ paddle2Y-=6 }
}
function moveEverything()
{
if(showingWinningScreen==true)
{
canvasContext.fillText("Click to continue",canvas.width/2,100);
return;
}
computerMovement(); // Turn off AI here
ballX+=ballSpeedX;
ballY+=ballSpeedY;
if(ballX<0)
{
if(ballY>paddle1Y &&
ballY<paddle1Y+PADDLE_HEIGHT)
{ ballSpeedX=-ballSpeedX;
var deltaY = ballY-(paddle1Y+PADDLE_HEIGHT/2); //difference
ballSpeedY = deltaY * 0.35;
}
else
{
player2Score++; //must be before ballReset()
ballReset();
}
}
if(ballX>canvas.width)
{
if(ballY>paddle2Y &&
ballY<paddle2Y+PADDLE_HEIGHT)
{ ballSpeedX=-ballSpeedX;
var deltaY = ballY-(paddle2Y+PADDLE_HEIGHT/2); //difference
ballSpeedY = deltaY * 0.35;
}
else
{
player1Score++; //must be before ballReset()
ballReset();
}
}
if(ballY<0)
{
ballSpeedY=-ballSpeedY;
}
if(ballY>canvas.height)
{
ballSpeedY=-ballSpeedY;
}
}
function drawNet()
{
for(var i=0;i<canvas.height;i+=40)
{
colorRect(canvas.width/2-1,i,2,20,'white');
}
}
function drawEverything()
{
console.log(ballX,ballY);
colorRect(0,0,canvas.width,canvas.height,'black'); //board
canvasContext.fillStyle='white';
if(showingWinningScreen==true)
{
if(player1Score==WINNING_SCORE)
{
canvasContext.fillText("Player Won !",canvas.width/3+20,200);
}
else if(player2Score==WINNING_SCORE)
{
canvasContext.fillText(" A.I. Won ! ",canvas.width/2-100,200);
}
canvasContext.fillText("Click to continue",canvas.width/3-20,100);
return;
}
drawNet(); //Net
colorRect(0,paddle1Y,PADDLE_THICKNESS,PADDLE_HEIGHT,'white'); //left peddle
colorRect(canvas.width-PADDLE_THICKNESS,paddle2Y,PADDLE_THICKNESS,PADDLE_HEIGHT,'white'); //right paddle
colorCircle(ballX,ballY,10,'white'); //ball
canvasContext.fillText("Player's Score:"+player1Score,canvas.width/13,100); //score display
canvasContext.fillText("A.I.'s Score:"+player2Score,canvas.width - canvas.width/2+canvas.width/9,100);
}
function colorCircle(centerX,centerY,radius,drawColor)
{
canvasContext.fillStyle=drawColor;
canvasContext.beginPath();
canvasContext.arc(centerX,centerY,radius,0,Math.PI*2,false);
canvasContext.fill();
}
function colorRect(leftX,topY,width,height,drawColor)
{
canvasContext.fillStyle = drawColor;
canvasContext.fillRect(leftX,topY,width,height);
}
</script>
</body>
</html>