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TennisGame.html
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<html>
<canvas id="gameCanvas"
width="800"
height="600">
</canvas>
<style>
#gameCanvas {
border-radius: 25px;
}
</style>
<script>
var canvas;
var canvasContext;
var ballX;
var ballY;
var ballSpeedX = 10;
var ballSpeedY = 4;
var player1Score = 0;
var player2Score = 0;
const WINNING_SCORE = 3;
var showingWinScreen = false;
var gameStart = false;
var paddle1Y = 250;
var paddle2Y = 250;
const PADDLE_HEIGHT = 100;
const PADDLE_THICKNESS = 10;
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(showingWinScreen){
player1Score = 0;
player2Score = 0;
showingWinScreen = false;
}
if(!gameStart) {
gameStart = true;
}
}
window.onload = function(){
canvas = document.getElementById('gameCanvas');
canvasContext = canvas.getContext('2d');
ballX = canvas.width/2;
ballY = canvas.height/2;
var framesPerSecond = 30;
setInterval(function(){
moveEverything();
drawEverything();
}, 1000/framesPerSecond);
canvas.addEventListener('mousedown',handleMouseClick);
canvas.addEventListener('mousemove',
function(evt) {
var mousePos = calculateMousePos(evt);
if(gameStart){
paddle1Y = mousePos.y - (PADDLE_HEIGHT/2);
}
});
}
function ballReset() {
if(player1Score >= WINNING_SCORE ||
player2Score >= WINNING_SCORE){
showingWinScreen = true;
}
ballSpeedX = -ballSpeedX;
ballX = canvas.width/2;
ballY = canvas.height/2;
}
function computerMovement() {
var paddle2YCenter = paddle2Y + (PADDLE_HEIGHT/2);
if(paddle2YCenter < ballY-35) {
paddle2Y += 6;
} else if(paddle2YCenter > ballY+35){
paddle2Y -= 6;
}
}
function moveEverything() {
if(showingWinScreen || !gameStart){
return;
}
computerMovement();
ballX += ballSpeedX;
ballY += ballSpeedY;
if(ballX <= PADDLE_THICKNESS) {
if(ballY > paddle1Y &&
ballY < paddle1Y+PADDLE_HEIGHT){
ballSpeedX = -ballSpeedX;
var deltaY = ballY - (paddle1Y+PADDLE_HEIGHT/2);
ballSpeedY = deltaY * 0.35;
} else {
player2Score++; // must be BEFORE ballReset()
ballReset();
}
}
if(ballX > canvas.width-PADDLE_THICKNESS) {
if(ballY > paddle2Y &&
ballY < paddle2Y+PADDLE_HEIGHT){
ballSpeedX = -ballSpeedX;
var deltaY = ballY - (paddle2Y+PADDLE_HEIGHT/2);
ballSpeedY = deltaY * 0.35;
} else {
player1Score++; // must be BEFORE ballReset()
ballReset();
}
}
if(ballY <= 10) {
ballSpeedY = -ballSpeedY;
}
if(ballY >= canvas.height-10) {
ballSpeedY = -ballSpeedY;
}
}
function drawNet() {
for(var i=0; i<canvas.height; i+=40) {
colorRect(canvas.width/2-1, i, 2, 20, 'white');
}
}
function drawEverything() {
// draws canvas
colorRect(0, 0, canvas.width, canvas.height, 'black');
if(showingWinScreen){
canvasContext.fillStyle = 'white';
if(player1Score >= WINNING_SCORE){
canvasContext.fillText("Left player Won!", (canvas.width/2)-25, 200);
}else if(player2Score >= WINNING_SCORE){
canvasContext.fillText("Right player Won!", (canvas.width/2)-25, 200);
}
canvasContext.fillText("Click to continue", (canvas.width/2)-25, canvas.height-180);
return;
}
// draws the net
drawNet();
// draws left paddle
colorRect(0, paddle1Y, PADDLE_THICKNESS, PADDLE_HEIGHT, 'white');
// draws right computer paddle
colorRect(canvas.width-PADDLE_THICKNESS, paddle2Y, PADDLE_THICKNESS, PADDLE_HEIGHT, 'white');
// draws ball
colorCircle(ballX, ballY, 10,'white');
canvasContext.fillText(player1Score, 100, 100);
canvasContext.fillText(player2Score, canvas.width-100, 100);
if(!gameStart){
canvasContext.fillStyle = 'white';
canvasContext.fillText("Click to start", (canvas.width/2)-25, (canvas.height/2)-65);
return;
}
}
function colorCircle(centerX, centerY, radius, drawColor) {
canvasContext.fillStyle = drawColor;
canvasContext.beginPath();
canvasContext.arc(centerX, centerY, radius, 0, Math.PI*2, true);
canvasContext.fill();
}
function colorRect(leftX, topY, width, height, drawColor) {
canvasContext.fillStyle = drawColor;
canvasContext.fillRect(leftX, topY, width, height);
}
</script>
</html>