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tennis.html
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<html>
<div style="display: flex; justify-content: center; align-items: center; width: 100%; height: 100vh;">
<canvas id="gameCanvas" width="800" height="600"></canvas>
</div>
<script>
var canvas;
var canvasContext;
var ballX = 50;
var ballY = 50;
var ballSpeedX = 6;
var ballSpeedY = 3;
var showWinScreen = false;
var computerSpeed = 4;
var paddle1Y = 250;
var paddle2Y = 250;
const PADDLE_HEIGHT = 100;
const PADDLE_THICKNESS = 10;
var player1Score = 0;
var player2Score = 0;
const WINNING_SCORE = 10;
function handleMouseClick (e) {
if (showWinScreen) {
player1Score = 0;
player2Score = 0;
computerSpeed = 4;
ballSpeedX = 6;
showWinScreen = false;
}
}
window.onload = function () {
canvas = document.getElementById('gameCanvas');
canvasContext = canvas.getContext('2d');
var framesPerSecond = 60;
setInterval(function () {
moveEverything();
drawEverything();
}, 1000/framesPerSecond);
canvas.addEventListener('mousedown', handleMouseClick);
canvas.addEventListener('mousemove', function (e) {
var mousePos = caluclateMousePosition(e);
paddle1Y = mousePos.y - (PADDLE_HEIGHT/2);
});
}
function ballReset () {
if (player1Score >= WINNING_SCORE || player2Score >= WINNING_SCORE) {
showWinScreen = true;
}
ballSpeedX++;
ballSpeedX = -ballSpeedX;
ballX = canvas.width/2;
ballY = canvas.height/2;
if ((player1Score + player2Score) % 4 === 0) computerSpeed++;
}
function caluclateMousePosition (e) {
var rect = canvas.getBoundingClientRect();
var root = document.documentElement;
var mouseX = e.clientX - rect.left - root.scrollLeft;
var mouseY = e.clientY - rect.top - root.scrollTop;
return {
x: mouseX,
y: mouseY
};
}
function computerMovement () {
var paddle2YCenter = paddle2Y + (PADDLE_HEIGHT/2);
if (paddle2YCenter < (ballY - 35) && (paddle2YCenter < (canvas.height - (PADDLE_HEIGHT/2)))) {
paddle2Y += computerSpeed;
} else if (paddle2YCenter > (ballY + 35) && (paddle2YCenter > PADDLE_HEIGHT/2)) {
paddle2Y -= computerSpeed;
}
}
function moveEverything () {
if (showWinScreen) return;
computerMovement();
ballX += ballSpeedX;
ballY += ballSpeedY;
if (ballX >= canvas.width - 10) {
if (ballY > paddle2Y && ballY < (paddle2Y+PADDLE_HEIGHT)) {
ballSpeedX = -ballSpeedX;
var deltaY = ballY - (paddle2Y + PADDLE_HEIGHT/2);
ballSpeedY = deltaY * 0.2;
} else {
player1Score++;
ballReset();
}
}
if (ballX <= 10) {
if (ballY > paddle1Y && ballY < (paddle1Y+PADDLE_HEIGHT)) {
ballSpeedX = -ballSpeedX;
var deltaY = ballY - (paddle1Y + PADDLE_HEIGHT/2);
ballSpeedY = deltaY * 0.2;
} else {
player2Score++;
ballReset();
}
}
if (ballY >= (canvas.height - 5) || ballY <= 5) {
ballSpeedY = -ballSpeedY;
}
}
function drawNet () {
for (var i = 10; i < canvas.height; i += 40) {
colorRect(canvas.width/2-1, i, 2, 20, '#00C853');
}
}
function drawEverything () {
// handle game over and show win screen
if (showWinScreen) {
var winner;
if (player1Score >= WINNING_SCORE) {
winner = 'Congrats! You Won!';
} else if (player2Score >= WINNING_SCORE) {
winner = 'BOOOOO! You lost!!'
}
canvasContext.fillStyle = '#FFEB3B';
canvasContext.font ='24px Arial';
canvasContext.fillText(winner, 280, 300);
canvasContext.fillText("Game Over...Click to Continue", 240, 400);
return;
}
// draws main canvas
colorRect(0, 0, canvas.width, canvas.height, '#263238');
drawNet();
// draws left paddle
colorRect(0, paddle1Y, PADDLE_THICKNESS, PADDLE_HEIGHT, '#64B5F6');
// draws right paddle
colorRect((canvas.width - PADDLE_THICKNESS), paddle2Y, PADDLE_THICKNESS, PADDLE_HEIGHT, '#64B5F6');
// draws ball
colorCircle(ballX, ballY, 10, '#F44336');
//draw scores
canvasContext.fillStyle = '#4DB6AC';
canvasContext.font = '20px Arial';
canvasContext.fillText(player1Score, 100, 100);
canvasContext.fillText(player2Score, canvas.width - 100, 100);
}
function colorRect (leftX, topY, width, height, drawColor) {
canvasContext.fillStyle = drawColor;
canvasContext.fillRect(leftX, topY, width, height);
}
function colorCircle (centerX, centerY, radius, drawColor) {
canvasContext.fillStyle = drawColor;
canvasContext.beginPath();
canvasContext.arc(centerX, centerY, radius, 0, Math.PI*2, true);
canvasContext.fill();
}
</script>
</html>